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Shiping, Gong, Wang Jichao, Shi Haitao, Song Riheng i Xu Rumei. "Illegal trade and conservation requirements of freshwater turtles in Nanmao, Hainan Province, China". Oryx 40, nr 3 (lipiec 2006): 331–36. http://dx.doi.org/10.1017/s0030605306000949.
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China has one of the world's most diverse freshwater turtle faunas but is also a major consumer of freshwater turtles. In the 1980s over-collecting, illegal trade and habitat destruction increased dramatically, pushing almost all Chinese turtles towards extinction. Despite the critical status of Chinese turtles little has been done to quantify and evaluate the impact of illegal activities on wild populations. We used a combination of market surveys and questionnaires to examine the illegal trade and conservation status of native freshwater turtles in Nanmao, Hainan Province, from February to August 2003. We found a total of 245 collected freshwater turtles comprising eight species. These data indicate that Nanmao has a rich freshwater turtle fauna that is being affected heavily by illegal poaching. No effective measures have been taken to protect the few remaining wild turtle populations. The main factors that lead to illegal trade include the cultural belief that turtles are a viable food/medicine product, lack of conservation awareness, poaching of turtles as a supplement to income, and poor law enforcement. Possible conservation strategies are discussed.
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Glorioso, Brad M., Allison J. Vaughn i J. Hardin Waddle. "The Aquatic Turtle Assemblage Inhabiting a Highly Altered Landscape in Southeast Missouri". Journal of Fish and Wildlife Management 1, nr 2 (1.11.2010): 161–68. http://dx.doi.org/10.3996/072010-jfwm-020.
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Abstract Turtles are linked to energetic food webs as both consumers of plants and animals and prey for many species. Turtle biomass in freshwater systems can be an order of magnitude greater than that of endotherms. Therefore, declines in freshwater turtle populations can change energy transfer in freshwater systems. Here we report on a mark–recapture study at a lake and adjacent borrow pit in a relict tract of bottomland hardwood forest in the Mississippi River floodplain in southeast Missouri, which was designed to gather baseline data, including sex ratio, size structure, and population size, density, and biomass, for the freshwater turtle population. Using a variety of capture methods, we captured seven species of freshwater turtles (snapping turtle Chelydra serpentina; red-eared slider Trachemys scripta; southern painted turtle Chrysemys dorsalis; river cooter Pseudemys concinna; false map turtle Graptemys pseudogeographica; eastern musk turtle Sternotherus odoratus; spiny softshell Apalone spinifera) comprising four families (Chelydridae, Emydidae, Kinosternidae, Trinoychidae). With the exception of red-eared sliders, nearly all individuals captured were adults. Most turtles were captured by baited hoop-nets, and this was the only capture method that caught all seven species. The unbaited fyke net was very successful in the borrow pit, but only captured four of the seven species. Basking traps and deep-water crawfish nets had minimal success. Red-eared sliders had the greatest population estimate (2,675), density (205/ha), and biomass (178 kg/ha). Two species exhibited a sex-ratio bias: snapping turtles C. serpentina in favor of males, and spiny softshells A. spinifera in favor of females.
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Browne, Constance L., S. Andrew Sullivan i Donald F. McAlpine. "Freshwater turtle by-catch from angling in New Brunswick, Canada". Canadian Field-Naturalist 134, nr 3 (28.11.2020): 222–30. http://dx.doi.org/10.22621/cfn.v134i3.2437.
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Turtles are among the most threatened vertebrate taxa, with populations especially vulnerable to any increase in adult mortality. By-catch from freshwater angling, as a potential cause of turtle mortality is poorly documented and little understood. Here we document cases of turtle by-catch by recreational anglers in an urban park in New Brunswick and among the wider angling communities in the province. We also consider factors that may influence rates of hooking. Although we are unable to estimate turtle hooking frequency for the provincial recreational angling community as a whole, five of 75 (~7%) anglers interviewed in the urban park reported interactions with a turtle, with most reported incidents (75%) involving hooking. Snapping Turtles (Chelydra serpentina) seem to be more prone to hooking than Eastern Painted Turtles (Chrysemys picta picta). Although we conclude that turtle hooking by recreational anglers appears to be generally uncommon in New Brunswick, even apparently low by-catch rates may be sufficient to lead to population declines at heavily fished sites. The collection of additional data on turtle by-catch in the recreational fishery in Canada is warranted.
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Li, Min, Cuijuan Niu i Yixuan Chen. "Diverse Response Pattern to Anoxia in Three Freshwater Turtle Species". Biology 12, nr 1 (27.12.2022): 50. http://dx.doi.org/10.3390/biology12010050.
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With increasing water eutrophication and global warming, anoxia and hypoxia are becoming more and more common in water environments. Most vertebrates have a limited tolerance to anoxia of only a few minutes, but some species, such as turtles, can survive for months being exposed to anoxia. Antioxidant defense systems may have a potential role in resisting anoxia stress in freshwater turtles. The three-keeled pond turtle Chinemys reevesii, the snapping turtle Chelydra serpentina and the soft-shelled turtle Pelodiscus sinensis are three popular aquaculture species and share similar habitats in China. While C. reevesii and C. serpentina are hard-shelled turtles with poor skin permeability, P. sinensis is soft-shelled turtle whose skin permeability is good. We examined the antioxidant defense responses in different tissues of the three turtle species under acute anoxia stress for 10 h and subsequently recovered for 24 h in order to reveal the response patterns of the antioxidant defense system of the three turtle species that differed in morphological structure and life history strategy. We found that the antioxidant response patterns to acute anoxia stress were tissue- and species-specific. The soft-shelled turtle was more sensitive to anoxia than the hard-shelled turtles. Under anoxia stress, the three species kept the activities of most antioxidant enzymes stable. C. reevesii and P. sinensis were highly dependent on vitamin C in antioxidant defense, while high activities of structural antioxidant enzymes were found in the tissues of C. serpentina. The above diverse patterns may be related with adaptive evolution of morphological structure and physiological functions of the three turtle species.
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Jadhav, Trupti D., Nitin S. Sawant i Soorambail K. Shyama. "Diversity and distribution of freshwater turtles (Reptilia: Testudines) in Goa, India". Journal of Threatened Taxa 10, nr 9 (26.08.2018): 12194. http://dx.doi.org/10.11609/jott.2835.10.9.12194-12202.
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Freshwater turtles symbolize a key component of biodiversity in aquatic ecosystems. Of the 356 living species of turtles and tortoises in the world, 34 species are recorded from India. The number of freshwater turtle and tortoise species found in the state of Goa, however, is debatable. No study specific to the Goa region has been carried out on freshwater turtles. Therefore, baseline data on diversity and distribution of freshwater turtles is scanty. The present study was conducted to address this lacuna in knowledge, which will further aid in identifying threats to the population of freshwater turtles and in devising appropriate methods for their conservation. The diversity and distribution of freshwater turtles was investigated in 186 sites in Goa from June 2012 to May 2015. A total of 337 specimens of two native and one introduced species of freshwater turtles belonging to three families—Trionychidae (Indian Flap-shell Turtle Lissemys puncata), Geomydidae (Indian Black Turtle Melanochelys trijuga) and Emydidae (Red-eared Slider Trachemys scripta elegans)— were identified. Melanochelys trijuga (52.23%) was the most widely and abundantly distributed species, and was recorded from 132 sites. L. punctata (46.88%) was recorded from 113 sites, while T. scripta elegans (0.89%) was rare and was recorded from only two sites. While Melanochelys trijuga is generalized in habitat selection, making it the widely distributed species in the State of Goa, L. punctata is more specific in habitat selection thus restricting its range to coastal, middle-level plateau and the foothills of Western Ghats.
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Jones, Michael T., Lisabeth L. Willey, Derek T. Yorks, Peter D. Hazelton i Steve L. Johnson. "Passive transport of Eastern Elliptio (Elliptio complanata) by freshwater turtles in New England". Canadian Field-Naturalist 134, nr 1 (8.07.2020): 56–59. http://dx.doi.org/10.22621/cfn.v134i1.2379.
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Dispersal of freshwater mussels (order Unionida) is primarily as glochidia on the fins and gills of host fish. Adult mussels are more sessile, generally moving short distances (<2 m/week) along lake and river beds. Between 2007 and 2016, we observed seven instances of adult Eastern Elliptio (Elliptio complanata) and one instance of a fingernail clam (Sphaerium sp.) attached to the feet of freshwater turtles in streams and ponds of New England, United States. Observations included five instances of mussels attached to Wood Turtles (Glyptemys insculpta) in Maine and Massachusetts, one instance of a mussel attached to the fingernail of an Eastern Painted Turtle (Chrysemys picta) in Massachusetts, one instance of a mussel attached to a Snapping Turtle (Chelydra serpentina) in Massachusetts, and one instance of a fingernail clam attached to the fingernail of an Eastern Painted Turtle in Massachusetts. We suggest that Eastern Elliptio may be susceptible to transport by freshwater turtles foraging in mussel beds and that transport of adult mussels by freshwater turtles could result in otherwise atypical long-distance, upstream, or overland dispersal between waterbodies.
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Dupuis-Desormeaux, Marc, Christina Davy, Amy Lathrop, Emma Followes, Andrew Ramesbottom, Andrea Chreston i Suzanne E. MacDonald. "Colonization and usage of an artificial urban wetland complex by freshwater turtles". PeerJ 6 (8.08.2018): e5423. http://dx.doi.org/10.7717/peerj.5423.
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Conservation authorities invest heavily in the restoration and/or creation of wetlands to counteract the destruction of habitat caused by urbanization. Monitoring the colonization of these new wetlands is critical to an adaptive management process. We conducted a turtle mark-recapture survey in a 250 ha artificially created wetland complex in a large North American city (Toronto, Ontario). We found that two of Ontario’s eight native turtle species (Snapping turtle (SN), Chelydra serpentina, and Midland Painted (MP) turtle, Chrysemys picta marginata) were abundant and both were confirmed nesting. The Blanding’s turtle (Emydoidea blandingii) was present but not well established. Species richness and turtle density were not equally distributed throughout the wetland complex. We noted SN almost exclusively populated one water body, while other areas of the wetland had a varying representation of both species. The sex ratios of both SN and MP turtles were 1:1. We tracked the movement of Snapping and Blanding’s turtles and found that most turtles explored at least two water bodies in the park, that females explored more water bodies than males, and that 95% of turtles showed fidelity to individual overwintering wetlands. We performed DNA analysis of two Blanding’s turtles found in the created wetlands and could not assign these turtles to any known profiled populations. The genetic data suggest that the turtles probably belong to a remnant local population. We discuss the implications of our results for connectivity of artificial wetlands and the importance of the whole wetland complex to this turtle assemblage.
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Karson, Alyson, Siow Yan Jennifer Angoh i Christina M. Davy. "Depredation of gravid freshwater turtles by Raccoons (Procyon lotor)". Canadian Field-Naturalist 132, nr 2 (1.01.2019): 122–25. http://dx.doi.org/10.22621/cfn.v132i2.2043.
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During summer 2017, we found 19 dead or fatally wounded adult female turtles belonging to three at-risk species at a nesting site on the north shore of Lake Erie, Ontario. Individuals were found flipped onto their carapace, had similar holes in their body cavities, and were eviscerated. Their eggs had also been consumed. Although turtle nest depredation by Raccoons (Procyon lotor) is common, it is unusual for them to target large numbers of gravid turtles within a season. Depredated species included Snapping Turtle (Chelydra serpentina), Northern Map Turtle (Graptemys geographica), and Blanding’s Turtle (Emydoidea blandingii). Our observation represents a spike in additive mortality for these populations, which could have long-term demographic consequences.
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Krishnakumar, K., Rajeev Raghavan i Benno Pereira. "Protected on Paper, Hunted in Wetlands: Exploitation and Trade of Freshwater Turtles (Melanochelys Trijuga Coronata and Lissemys Punctata Punctata) in Punnamada, Kerala, India". Tropical Conservation Science 2, nr 3 (wrzesień 2009): 363–73. http://dx.doi.org/10.1177/194008290900200306.
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Soft shell turtles are among the most threatened groups of freshwater animals that are in need of urgent conservation attention. In Kerala (South India), two species of freshwater turtles, the Indian black turtle or Indian pond terrapin, Melanochelys trijuga coronata (Schweigger, 1812) and the Indian Flap-shelled turtle Lissemys punctata punctata (Lacépède, 1788) are exploited from Vembanad lake and associated wetlands in Punnamada to meet the demand from local restaurants and toddy shops. Eight hundred and forty three individuals belonging to the two species (499 pond terrapins and 344 flap-shelled turtle) were observed during a field survey conducted in 2007 at Punnamada. Despite being listed at the highest level in the Indian wildlife protection act, very little law enforcement takes place and turtles are exploited and traded regularly. Collection and trade have also become an important component of the local livelihoods in Punnamada, with the involvement of around five full-time and 25 part-time collectors. Details of the collection, marketing, economics and management of the freshwater turtles in Punnamada are discussed.
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Jackson, Donald C., Sarah E. Taylor, Vivian S. Asare, Dania Villarnovo, Jonathan M. Gall i Scott A. Reese. "Comparative shell buffering properties correlate with anoxia tolerance in freshwater turtles". American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 292, nr 2 (luty 2007): R1008—R1015. http://dx.doi.org/10.1152/ajpregu.00519.2006.
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Freshwater turtles as a group are more resistant to anoxia than other vertebrates, but some species, such as painted turtles, for reasons not fully understood, can remain anoxic at winter temperatures far longer than others. Because buffering of lactic acid by the shell of the painted turtle is crucial to its long-term anoxic survival, we have tested the hypothesis that previously described differences in anoxia tolerance of five species of North American freshwater turtles may be explained at least in part by differences in their shell composition and buffering capacity. All species tested have large mineralized shells. Shell comparisons included 1) total shell CO2 concentration, 2) volume of titrated acid required to hold incubating shell powder at pH 7.0 for 3 h (an indication of buffer release from shell), and 3) lactate concentration of shell samples incubated to equilibrium in a standard lactate solution. For each measurement, the more anoxia-tolerant species (painted turtle, Chrysemys picta; snapping turtle, Chelydra serpentina) had higher values than the less anoxia-tolerant species (musk turtle, Sternotherus odoratus; map turtle, Graptemys geographica; red-eared slider, Trachemys scripta). We suggest that greater concentrations of accessible CO2 (as carbonate or bicarbonate) in the more tolerant species enable these species, when acidotic, to release more buffer into the extracellular fluid and to take up more lactic acid into their shells. We conclude that the interspecific differences in shell composition and buffering can contribute to, but cannot explain fully, the variations observed in anoxia tolerance among freshwater turtles.
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Smith, Geoffrey R., Jessica E. Rettig i John B. Iverson. "Is righting response lateralized in two species of freshwater turtles?" Behaviour 154, nr 9-10 (2017): 1069–79. http://dx.doi.org/10.1163/1568539x-00003458.
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Laterality has been found in a variety of reptiles. In turtles, one important behaviour is the righting response. Here, we studied laterality of righting response of two species of freshwater turtles, the Painted Turtle (Chrysemys picta) and the Eastern Musk Turtle (Sternotherus odoratus). We found evidence of individual-level laterality in righting response inC. picta, but notS. odoratus. Neither species showed evidence of population-level laterality in righting response. Our results suggest that there is variation in the extent of laterality of righting response in turtles. Possible explanations for variation in laterality of righting response in turtles include shell shape and use of terrestrial habitats. However, more species of turtles need to be examined to demonstrate any general patterns in laterality of righting response in turtles.
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Beale, David J., Thao V. Nguyen, Rohan M. Shah, Andrew Bissett, Akhikun Nahar, Matthew Smith, Viviana Gonzalez-Astudillo, Christoph Braun, Brenda Baddiley i Suzanne Vardy. "Host–Gut Microbiome Metabolic Interactions in PFAS-Impacted Freshwater Turtles (Emydura macquarii macquarii)". Metabolites 12, nr 8 (16.08.2022): 747. http://dx.doi.org/10.3390/metabo12080747.
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Per-and polyfluoroalkyl substances (PFAS) are a growing concern for humans, wildlife, and more broadly, ecosystem health. Previously, we characterised the microbial and biochemical impact of elevated PFAS on the gut microbiome of freshwater turtles (Emydura macquarii macquarii) within a contaminated catchment in Queensland, Australia. However, the understanding of PFAS impacts on this species and other aquatic organisms is still very limited, especially at the host–gut microbiome molecular interaction level. To this end, the present study aimed to apply these leading-edge omics technologies within an integrated framework that provides biological insight into the host turtle–turtle gut microbiome interactions of PFAS-impacted wild-caught freshwater turtles. For this purpose, faecal samples from PFAS-impacted turtles (n = 5) and suitable PFAS-free reference turtles (n = 5) were collected and analysed. Data from 16S rRNA gene amplicon sequencing and metabolomic profiling of the turtle faeces were integrated using MetOrigin to assign host, microbiome, and co-metabolism activities. Significant variation in microbial composition was observed between the two turtle groups. The PFAS-impacted turtles showed a higher relative abundance of Firmicutes and a lower relative abundance of Bacteroidota than the reference turtles. The faecal metabolome showed several metabolites and pathways significantly affected by PFAS exposure. Turtles exposed to PFAS displayed altered amino acid and butanoate metabolisms, as well as altered purine and pyrimidine metabolism. It is predicted from this study that PFAS-impacted both the metabolism of the host turtle and its gut microbiota which in turn has the potential to influence the host’s physiology and health.
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Foglini, Claudio. "Not only pond sliders: freshwater turtles in the water bodies of the Milan northern urban area (Italy)". Natural History Sciences 8, nr 2 (28.10.2021): 53–58. http://dx.doi.org/10.4081/nhs.2021.529.
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Freshwater turtles represent one of the most common pets released in urban water bodies. In Europe, after the ban on the import of Trachemys scripta, other non-native turtle species now dominate the legal pet trade. Some of these species have high invasive potential, such as the well-known slider turtle, but their diffusion outside their native range is poorly known. This work summarises presence data about non-native freshwater turtles, different from slider turtles T. scripta, into two urban parks located at the northern boundary of the Milan outskirts (Italy, Lombardy). Turtle detections were obtained merging field surveys conducted from 2014 to 2020, with sparse pictures taken by occasional observers. The situation depicted shows, in addition to the ubiquitous spread of slider turtle subspecies and hybrids in both parks, the frequent presence of other multiple genera such as Pseudemys and Graptemys. Isolated individuals of Apalone spinifera, Graptemys ouachitensis, Mauremys sinensis, Pelomedusa subrufa and Sternotherus carinatus were also found. I also detected one Emys orbicularis, probably escaped or released.
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Georges, Arthur, Erika Alacs, Matthew Pauza, Felix Kinginapi, Amos Ona i Carla Eisemberg. "Freshwater turtles of the Kikori Drainage, Papua New Guinea, with special reference to the pig-nosed turtle, Carettochelys insculpta". Wildlife Research 35, nr 7 (2008): 700. http://dx.doi.org/10.1071/wr07120.
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A survey of the Kikori River drainage of the Gulf Province of Papua New Guinea identified four species of freshwater turtle. The pig-nosed turtle Carettochelys insculpta and the southern New Guinea soft-shelled turtle Pelochelys bibroni are riverine species. The New Guinea spotted turtle Elseya novaeguineae lives primarily in the tidal freshwater creeks and streams, flooded sinkholes and swamps of the lowland rainforest. The New Guinea painted turtle Emydura subglobosa resides almost exclusively in forest sinkholes and swamps. Pelochelys bibroni was the least-common species, and is probably locally endangered. Greatest turtle diversity occurred in the Karst Plains of the Kikori sub-basin, where there is a greater diversity of habitat available to turtles. Lowest diversity occurred in the highlands, where turtles were present in very low density as introduced populations, brought in from the Kikori lowlands, Mount Bosavi and the Western Province by visiting relatives. Linguistic diversity concurred with turtle diversity of the regions in which the languages were spoken. C. insculpta nests both on riverine sand beaches and on coastal beaches, sand spits and isolated sand bars where the Kikori River discharges into the Gulf of Papua. Adult females and eggs of C. insculpta are harvested heavily by local people for local consumption.
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Chen, Tien-Hsi, i Kuang-Yang Lue. "Population status and distribution of freshwater turtles in Taiwan". Oryx 44, nr 2 (kwiecień 2010): 261–66. http://dx.doi.org/10.1017/s0030605310000013.
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AbstractBecause of burgeoning demand in the Chinese market and extensive habitat loss more than half of the freshwater turtle and tortoise species in Asia are categorized as Endangered or Critically Endangered on the IUCN Red List. To investigate the distribution and status of the native freshwater turtle species of Taiwan a trapping programme was conducted during 2001–2007, yielding a total of 1,828 individuals of four native species at 103 sites. Mauremys sinensis was the most abundant and widely distributed species; it was collected from 70 sites and accounted for 78.6% of all turtles captures. Mauremys mutica comprised 17.8% at 46 sites. Pelodiscus sinensis were captured in low numbers at 19 sites. No Mauremys reevesii were collected on the main island of Taiwan but the species was found on Kinmen Island near mainland China. Capture success was low at most sites and overall sex ratios were significantly male-biased in all species, suggesting that the freshwater turtles have suffered from the negative effects of habitat disturbance and extensive exploitation. Effective conservation measures are urgently required to ensure the viability of the native freshwater turtle species of Taiwan.
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Mushtaq, Iqra Mushtaq. "Molecular Ecology of Freshwater Turtles and Future directions". Agricultural Sciences Journal 4, nr 2 (31.12.2022): 115–26. http://dx.doi.org/10.56520/asj.v4i2.200.
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The distribution and diversity of turtles now reflect the lengthy and complex evolution of the taxonomy, which represents an old group of tetrapod vertebrates in terms of evolutionary history. Freshwater turtles represent the majority of the 365 species, and they mostly live in tropical and subtropical regions. Emydidae diversity hotspots can be found in Southeast North America, as can Geoemydidae and Trionychidae in the Indo-Malayan area. While Pelomedusidae are mostly found in Africa, Chelidae are primarily found in the Neotropics and Australia. Most species of the genus are endemic to a particular region or even to a single location. The majority of freshwater turtles suffer varied degrees of threat, mostly from habitat changes and collection. With the use of morphological and molecular data, the majority of phylogenetic trees for different turtle species have been generated using DNA techniques and procedures. The complete mitochondrial DNA (mtDNA), dehydrogenase subunit 4 (ND4), cytochrome b (Cyt b), carapacial ridge (CR), and cytochrome c oxidase subunit I (CO I) genes of freshwater turtles were sequenced by using universal PCR and long-PCR methods. Along with CR sequences of freshwater turtles, the composition and structure of the control region of diverse species were compared and analysed. Functional domains in the regulatory area, as well as their conserved sequences, were determined based on sequence similarities to other turtles. The mitochondrial regulatory regions and flanking sequences of diverse freshwater turtle species were recovered using Long-PCR and gene-specific primers. To clarify the genetic links between the fresh water turtle species that share the same habitat type, a tree was created based on Cytochrome b sequencing data and the PCR- Restriction fragment length polymorphism (RFLP) pattern. Keywords: Complex evolution, Phylogenetics, Phylogenomics, Tetrapod vertebrates
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Yudha, Donan Satria, Fidelis Triki Sadewa Aritona i Rury Eprilurahman. "Characteristics of Shell Bone as an Identification Tool for Turtle Species (Reptiles: Testudines) in Java, Borneo, and Sumatra". Journal of Tropical Biodiversity and Biotechnology 5, nr 1 (14.04.2020): 35. http://dx.doi.org/10.22146/jtbb.47227.
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There are 42 species of turtles; including sea turtle, freshwater turtle, tortoise, and softshell turtle (Reptilia: Testudines) living in Indonesia today. Turtles have economic values for quite a long time and it has led to illegal trade such as smuggling of carapace and plastron bones. Identification is needed to find out more details about the turtle species. Turtles have shells as unique features with different characteristics on each species. Shell’s identification usually relies on the shape of carapace and plastron. The purpose of this research is to understand turtle shell morphological characters and determine the diagnostic characters of each species. We conducted visual observation on specimen collections from the Laboratory of Animal Systematics, Faculty of Biology, Universitas Gadjah Mada and Museum of Biology, Faculty of Biology, Universitas Gadjah Mada. The result shows that each turtle species have their own unique shell bone’s characters, therefore it can be used to determine each turtle species of Indonesia.
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Davy, Christina M., Kum C. Shim i Suzanne M. Coombes. "Leech (Annelida: Hirudinea) Infestations on Canadian Turtles, Including the First Canadian Record of Helobdella modesta from Freshwater Turtles". Canadian Field-Naturalist 123, nr 1 (1.01.2009): 44. http://dx.doi.org/10.22621/cfn.v123i1.673.
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We collected leeches from freshwater turtles at two sites in southwestern Ontario. Five leech species (Placobdella parasitica, P. ornata, Helobdella modesta, Erpobdella punctata and Alboglossiphonia heteroclita) were collected from five turtle species (Chrysemys picta, Chelydra serpentina, Clemmys guttata, Emydoidea blandingii and Sternotherus odoratus). We report a new leech record (P. ornata) for C. guttata. The unexpectedly high frequency of H. modesta on freshwater turtles is discussed.
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Parks, Matthew, Cameron Kedy i Casey Skalla. "Consistent patterns in 16S and 18S microbial diversity from the shells of the common and widespread red-eared slider turtle (Trachemys scripta)". PLOS ONE 15, nr 12 (28.12.2020): e0244489. http://dx.doi.org/10.1371/journal.pone.0244489.
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Microbial communities associated with freshwater aquatic habitats and resident species are both critical to and indicative of ecosystem status and organismal health. External surfaces of turtle shells readily accumulate microbial growth and could carry representation of habitat-wide microbial diversity, since they are in regular contact with multiple elements of freshwater environments. Yet, microbial diversity residing on freshwater turtle shells is poorly understood. We applied 16S and 18S metabarcoding to characterize microbiota associated with external shell surfaces of 20 red-eared slider (Trachemys scripta) turtles collected from varied habitats in central and western Oklahoma, and ranging to southeast Iowa. Shell-associated microbial communities were highly diverse, with samples dominated by Bacteroidia and alpha-/gamma-proteobacteria, and ciliophoran alveolates. Alpha diversity was lower on turtle shells compared to shallow-water-associated environmental samples, likely resulting from basking-drying behavior and seasonal scute shedding, while alpha diversity was higher on carapace than plastron surfaces. Beta diversity of turtle shells was similarly differentiated from environmental samples, although sampling site was consistently a significant factor. Deinococcus-Thermus bacteria and ciliophoran alveolates were recovered with significantly higher abundance on turtle shells versus environmental samples, while bacterial taxa known to include human-pathogenic species were variably more abundant between shell and environmental samples. Microbial communities from a single, shared-site collection of the ecologically similar river cooter (P. concinna) largely overlapped with those of T. scripta. These data add to a foundation for further characterization of turtle shell microbial communities across species and habitats, with implications for freshwater habitat assessment, microbial ecology and wildlife conservation efforts.
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Dawson, Stuart J., Heather M. Crawford, Robert M. Huston, Peter J. Adams i Patricia A. Fleming. "How to catch red foxes red handed: identifying predation of freshwater turtles and nests". Wildlife Research 43, nr 8 (2016): 615. http://dx.doi.org/10.1071/wr16066.
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Context Predation is one of the key contributors to mortality in freshwater turtles. Confirming the identity of predators is an important step towards conservation management action. Throughout Australia, the red fox (Vulpes vulpes) is suspected to apply significant and unsustainable predation pressure to turtle populations, killing adults and depredating nests; however methods for confirming this are limited. Aims The present study used a range of methods to confirm predation of oblong turtle (Chelodina colliei) nests and adults by the introduced red fox. Methods First, depredated adult carapaces, and turtle egg-shell fragments from excavated nests were swabbed and analysed for trace DNA. Second, we used artificial turtle nests, monitored by camera traps, to analyse seasonal changes in the behaviour of foxes around sites where turtle nests are present, including over the nesting season. Last, we used scat analysis to identify the prevalence of turtle remains in fox diet. Key results Predominantly fox DNA was recovered from both adult carapaces and depredated eggs. In addition, camera traps recorded only foxes depredating artificial nests. Despite this evidence that foxes kill adults and excavated nests, we found that turtle remains were only a small part of the diet of foxes at this study site (hatchling or turtle egg shell were present in only 4% of 230 scats sampled). The diet of these foxes was largely anthropogenic-sourced foods, such as fruit (e.g. figs, grapes, melons; 81% of scats), sheep carrion (41%) and rodents (36%). Conclusions We conclude that DNA analysis, camera trapping and scat analysis are effective methods of identifying foxes as predators of adult turtle, and their nests. Furthermore, we found that anthropogenic foods (orchard crops, livestock or synanthropic species) may subsidise greater fox population size than might occur in their absence, thereby increasing potential pressure on these freshwater turtles. Implications Our findings give credence to the argument that foxes are effective predators of turtle adults and nests. In addition, the high proportion of anthropogenic food sources in the diet of foxes, and potential subsidisation, is an important consideration for land managers.
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Das Mahapatra, Ardhendu, Anweshan Patra i Sudipta Kumar Ghorai. "First report of melanism in Indian Flapshell Turtle Lissemys punctata (Bonnaterre, 1789) from a turtle trading market of West Bengal, India". Journal of Threatened Taxa 14, nr 10 (26.10.2022): 22032–35. http://dx.doi.org/10.11609/jott.8025.14.10.22032-22035.
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The Indian flapshell turtle Lissemys punctata is a freshwater softshell turtle species distributed throughout Bangladesh, India, Myanmar, Nepal, and Pakistan. Here, we report first observation of melanism in L. punctata among rescued turtles from a turtle trading market. Although L. punctata is under Schedule-I in the Wildlife Protection Act, 1972 of India still it sold in open markets in different parts of West Bengal. A systematic market survey and study on community perception are needed to understand the dynamics and factors influencing turtle trading in West Bengal. Enforcement of laws and mass community awareness are suggested to stop illegal turtle trading and consumption.
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Myers, Andrew T., i James P. Gibbs. "Landscape-level Factors Influencing Bog Turtle Persistence and Distribution in Southeastern New York State". Journal of Fish and Wildlife Management 4, nr 2 (1.04.2013): 255–66. http://dx.doi.org/10.3996/052012-jfwm-044.
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Abstract The bog turtle Glyptemys muhlenbergii is a highly endangered species inhabiting freshwater wetlands of the eastern United States. Habitat degradation is considered one of the chief causes of bog turtle declines. Most of the studies investigating habitat requirements of bog turtles focus on intrawetland influences on bog turtle habitat, but few have explored landscape-level drivers of bog turtle distribution. To better understand causes of bog turtle declines, we combined bog turtle occurrence records with geographic data to contrast 12 landscape variables among wetlands containing extant populations of bog turtles (n = 65) and 500 nearby and 500 distant, randomly located wetlands in southeastern New York State. In contrast to randomly chosen wetlands, bog turtles have persisted in relatively large, open-canopy wetlands (typically >0.42 ha) within large watersheds (typically >13.54 ha), in wetlands with more numerous stream connections, and more often in wetlands positioned atop carbonaceous rock types. Wetlands occurring within carbonaceous surficial geological settings may be more resistant to bog turtle habitat degradation and hence likely to support more persistent populations of bog turtles. Our findings that geomorphic features and intrawetland vegetation are the most useful predictors of bog turtle occurrence and persistence in southeastern New York State are important for generating more detailed hypotheses regarding drivers of bog turtle declines and are also helpful for prioritizing sites for bog turtle conservation and guiding surveys to discover new populations.
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Rawski, Mateusz, Christoph Mans, Bartosz Kierończyk, Sylwester Świątkiewicz, Aneta Barc i Damian Józefiak. "Freshwater turtle nutrition – a review of scientific and practical knowledge". Annals of Animal Science 18, nr 1 (1.01.2018): 17–37. http://dx.doi.org/10.1515/aoas-2017-0025.
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Abstract Freshwater turtles are commonly kept in captivity as pets, bred in zoos for conservation programs, and commercially farmed for pet markets and human consumption, but their nutrition can be challenging. However, based on practical experience, two main strategies may be identified: the use of non-calculated raw diets and the use of balanced commercial feeds. Raw diets are based on fresh, frozen and dried components including invertebrates, fish, rodents and plant matter; they imitate the variety of foods that are accessible to turtles in the wild and are considered most useful when turtles are bred for reintroduction into their natural habitat as part of conservation programs. Granulated, pelleted or extruded commercial diets are frequently used for farmed and pet turtles; they contain animal- and plant-based materials supplemented with vitamin and mineral premixes and calculated to reach the nutrient levels assumed to be optimal for most species. Until more species-specific information on the nutritional requirements of freshwater turtles is available, the Chinese softshell turtle (Pelodiscus sinensis), a commonly commercially farmed species for human consumption, may be used as a reference for other species in terms of suggested nutrient levels. Based on experimental data, the most important nutrients and their levels that should be included in turtle diets are crude protein (39.0-46.5%), crude fat (8.8%), Ca (5.7%), P (3.0%), methionine (1.03%), and cysteine (0.25%). The diet composition for freshwater turtles should be based on scientific knowledge and practical experience, so this paper aimed to present and discuss the available data on the nutrient requirements of turtles and the characteristics of the feed materials used in their nutrition.
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Al-Asif, Abdulla. "A ray of hope in the darkness: What we have learned from Yangtze giant soft-shell turtle Rafetus swinhoei (Gray, 1873) conservation?" Asian Journal of Conservation Biology 11, nr 2 (2022): 167–68. http://dx.doi.org/10.53562/ajcb.en00022.
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The Swinhoe's softshell turtle, Rafetus swinhoei (Gray, 1873),) is one of the world's largest freshwater turtles, and possibly the most endangered turtle species on the planet (Stanford et al., 2018). It has an overall length of over 100 cm and a width of up to 70 cm, and it can easily weigh up to 70–100 kg, maximum weight was recorded at 169 kg (Solimine, 2013; Trong, 2018).
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Shao, Shuai, Lan Li, Yang Yang i Chang-Fu Zhou. "Hyperphalangy in a new sinemydid turtle from the Early Cretaceous Jehol Biota". PeerJ 6 (27.07.2018): e5371. http://dx.doi.org/10.7717/peerj.5371.
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Hyperphalangy is a rare condition in extant aquatic turtles, and mainly limited to soft-shelled turtles. Here we report a new freshwater turtle,Jeholochelys lingyuanensisgen. et sp. nov. from the Early Cretaceous Jehol Biota of western Liaoning, China. This new turtle is characterized by a hyperphalangy condition with one additional phalanx in pedal digit V, rather than the primitive condition (phalangeal formula: 2-3-3-3-3) of crown turtles.J. lingyuanensisis recovered with other coexisting turtles in the family Sinemydidae in the phylogenetic analysis. This discovery further confirms that hyperphalangy occurred multiple times in the early evolutionary history of the crown turtles. Hyperphalangy is possibly a homoplasy inJeholochelysand the soft-shelled turtles to adapt to the aquatic environments.
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Li, Han, Qinyuan Meng, Wanling Wang, Dongmei Mo, Wei Dang i Hongliang Lu. "Gut Microbial Composition and Liver Metabolite Changes Induced by Ammonia Stress in Juveniles of an Invasive Freshwater Turtle". Biology 11, nr 9 (5.09.2022): 1315. http://dx.doi.org/10.3390/biology11091315.
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As the most common pollutant in aquaculture systems, the toxic effects of ammonia have been extensively explored in cultured fish, molluscs, and crustaceans, but have rarely been considered in turtle species. In this study, juveniles of the invasive turtle, Trachemys scripta elegans, were exposed to different ammonia levels (0, 0.3, 3.0, and 20.0 mg/L) for 30 days to evaluate the physiological, gut microbiomic, and liver metabolomic responses to ammonia in this turtle species. Except for a relatively low growth rate of turtles exposed to the highest concentration, ammonia exposure had no significant impact on the locomotor ability and gut microbial diversity of turtles. However, the composition of the microbial community could be altered, with some pathogenic bacteria being increased in ammonia-exposed turtles, which might indicate the change in their health status. Furthermore, hepatic metabolite profiles via liquid chromatography–mass spectrometry revealed extensive metabolic perturbations, despite being primarily involved in amino acid biosynthesis and metabolism. Overall, our results show that ammonia exposure causes gut dysbacteriosis and disturbs various metabolic pathways in aquatic turtle species. Considering discrepant defense mechanisms, the toxic impacts of ammonia at environmentally relevant concentrations on physiological performance might be less pronounced in turtles compared with fish and other invertebrates.
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Thang, Nguyen Tai, Tran Thi Tuyet Dung, Hoang Van Ha, Timothy E. M. McCormack i Nguyen Thanh Luan. "SPECIES COMPOSITION OF TORTOISES AND FRESHWATER TURTLES IN NINH THUAN PROVINCE, SOUTHERN VIETNAM". Journal of Forestry Science and Technology, nr 14 (2022): 46–54. http://dx.doi.org/10.55250/jo.vnuf.2022.14.046-054.
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Chelonian diversity of Ninh Thuan province, South Central Coastal Vietnam, is still poorly understood. In this study, we conducted a semi-structured interview survey (2019) in 5 districts of Ninh Thuan province and a 7-day long field survey (2021) in Phuoc Binh National Park, Bac Ai district, Ninh Thuan province, as preliminary surveys to help contribute to current knowledge on the species diversity of tortoises and freshwater turtles in the province. As a result, 11 species of tortoise and freshwater turtle belonging to three (03) families account for 42.31% of the 26 total number of native tortoise and freshwater turtle species in Vietnam are likely to be distributed in Ninh Thuan province based on our findings. Of these, 9 species are threatened with extinction according to the IUCN Red List 2021 at the levels of Vulnerable (VU) (2 species), Endangered (EN) (3 species), and Critically Endangered (CR) (4 species). While 8 are listed in the Vietnam Red Book 2007, 5 VU, 2 EN, and 1 CR. Initial survey results also show that it is likely that the endemic and Critically Endangered Southern Vietnam Box Turtle (Cuora picturata) occurs in Phuoc Binh National Park, based on a shell specimen found in the wild for which genetic analysis is pending verification. Further surveys are still urgently needed to confirm Cuora picturata and other species in the wild and to better complete the list of tortoise and freshwater turtle species and their distributions within Ninh Thuan province.
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Lutz, P. L., i S. L. Leone-Kabler. "Upregulation of the GABAA/benzodiazepine receptor during anoxia in the freshwater turtle brain". American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 268, nr 5 (1.05.1995): R1332—R1335. http://dx.doi.org/10.1152/ajpregu.1995.268.5.r1332.
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The freshwater turtle brain survives anoxia by decreasing its energy expenditure. During this anoxic period there is a sustained release of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA). This study investigated whether there was a corresponding change in the binding properties of the GABAA/benzodiazepine (GABA/BDZ) receptor. Turtles (Trachemys scripta) were subjected to a 100% N2 atmosphere for up to 24 h. After exposure, the cerebral cortex was dissected out, and saturation binding assays for GABA/BDZ receptors were performed using the radioligand [3H]flunitrazepam. Control turtles had a dissociation constant (Kd) of 1.97 +/- 0.54 nM and a receptor density (Bmax) of 2,404 +/- 221 fmol/mg protein. The Kd showed no significant change over 24 h of anoxia. However, significant increases were seen in Bmax after 12 h (21%, P < 0.05) and 24 h (29%, P < 0.01) of anoxia. We suggest that a long-term upregulation of GABAA receptors occurs in the anoxic turtle brain that acts to increase the inhibitory effectiveness of the released GABA and thereby contributes to anoxia survival of the turtle.
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Palumbo, E., M. R. Werneck i J. I. Diaz. "Is Amphiorchis (Digenea: Spirorchiidae) an exclusive parasite of sea turtles?" Helminthologia 56, nr 1 (1.03.2019): 75–80. http://dx.doi.org/10.2478/helm-2018-0045.
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SummaryThe side-necked turtle Hydromedusa tectifera commonly inhabits the tributary streams of the Rio de La Plata and occasionally is found in brackish waters within the estuary of the Rio de La Plata. Few studies have been conducted on its parasitic fauna, especially in Argentina. In the present work Amphiorchis sp. is registered for the first time in a freshwater turtle, expanding the knowledge about the specificity of the genus that until now was considered inhabiting only marine turtles.
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Langer, Sarah V., Carolyn M. Kapron i Christina M. Davy. "Abnormal persistence of the chorioallantoic membrane is associated with severe developmental abnormalities in freshwater turtles". Canadian Journal of Zoology 98, nr 3 (marzec 2020): 229–35. http://dx.doi.org/10.1139/cjz-2019-0169.
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Development in oviparous reptiles requires the correct formation and function of extra-embryonic membranes in the egg. In 2017, we incubated 2583 eggs from five species of freshwater turtle during a long-term ecological study and opened eggs that failed to hatch. We described a previously unreported developmental anomaly: the retention of an extra-embryonic membrane around 7 turtles (1 Spiny Softshell Turtle (Apalone spinifera (Le Sueur, 1827)), 1 Snapping Turtle (Chelydra serpentina (Linnaeus, 1758)), and 5 Northern Map Turtles (Graptemys geographica (Le Sueur, 1817))) that were alive but unhatched >14 days after their clutch mates had emerged. We investigated the association between retention of this membrane and the exhibition of other developmental deformities of varying severity, and we tested whether this novel abnormality was associated with reduced fertility or hatching success in affected clutches. Consultation of ∼150 years of literature suggests that we observed persistence of the chorioallantoic membrane (CAM; also called the chorioallantois). Our data suggest that clutches where at least one turtle exhibits a persistent CAM may also exhibit slightly reduced fertility or hatch success in the rest of the clutch compared with conspecific clutches that do not contain this anomaly. Future research should investigate the factors predicting CAM retention and other developmental abnormalities.
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Koo, Kyo Soung, Kayoung Yun i Yikweon Jang. "Ozobranchus jantseanus (Clitellata: Ozobranchidae) from Reeve’s Turtle, Mauremys reevesii: New Annelid Fauna in Korea". Korean Journal of Parasitology 60, nr 3 (30.06.2022): 213–15. http://dx.doi.org/10.3347/kjp.2022.60.3.213.
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Turtle leeches have not been recorded in Korea, although they occur in geographically adjacent countries including China and Japan. This study describes a turtle leech, <i>Ozobranchus jantseanus</i> (Clitellata: Ozobranchidae), found from Reeve’s turtle (Mauremys reevesii) in Korea. Of the 143 Reeve’s turtles collected from the freshwater reservoir in Jinju City, Gyeongsangnam-do, Korea, 95 unidentified leeches were found in 8 (5.6%) individuals. The leeches had 22 somites with 11 pairs of externally exposed branchiae, body-sized posterior suckers, and spines on the dorsal surface. We identified these leeches as <i>Ozobranchus jantseanus</i> Oka, 1912 (Clitellata: Ozobranchidae). This species of turtle leeches found in Korea may fill the gap in the biodiversity of East Asian annulus.
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Georges, Arthur, Fiorenzo Guarino i Biatus Bito. "Freshwater turtles of the TransFly region of Papua New Guinea - notes on diversity, distribution, reproduction, harvest and trade". Wildlife Research 33, nr 5 (2006): 373. http://dx.doi.org/10.1071/wr05087.
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The Chelidae is a family of side-necked turtles restricted in distribution to South America and Australasia. While their biology in Australia is reasonably well known, species in New Guinea are very poorly known despite high diversity, especially in the southern lowlands. In this paper, we report on the diversity, distribution, habitat and reproductive biology of the freshwater turtles of the TransFly region of the Western Province of Papua New Guinea, with special emphasis on reproduction of Emydura subglobosa, Elseya branderhorsti and Elseya novaeguineae. Seven species were captured, with reliable records of an eighth. A key to the freshwater turtles of the TransFly region is provided. Harvest methods, consumption, and trade in turtles by the TransFly communities are documented. There is mounting pressure to take advantage of revenue opportunities afforded by the Asian turtle trade, but this is impeded by lack of transport infrastructure. There is also insufficient demographic information on any New Guinean turtle species to make a reasoned judgment on the level of harvest that would be sustainable. Nor is there sufficient information on captive rearing for most species, and where it is available it is not accessible by local villagers. These knowledge gaps need to be addressed and factored into a management plan that is implemented before local communities can capitalise on the commercial opportunities provided by the turtle fauna without risking collapse of the resource and the implications for their concurrent subsistence economy that would follow.
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Dupuis-Désormeaux, Marc, Vince D’Elia, Ryan Burns, Brittany White i Suzanne E. MacDonald. "A turtle population study in an isolated urban wetland complex in Ontario reveals a few surprises". FACETS 4, nr 1 (1.06.2019): 584–97. http://dx.doi.org/10.1139/facets-2019-0046.
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We report on the results of the first mark–recapture survey of freshwater turtles in an isolated urban wetland complex in one of Canada’s fastest growing municipalities. Although we found turtles in every surveyed wetland, the density and assemblage of turtles in smaller wetlands were significantly different than in larger wetland bodies. We also documented two species of turtles that were thought to be absent from this wetland complex, the Northern Map turtle and Eastern Musk turtle. We noted that a wetland that was bisected by a high-traffic road showed a male-skewed sex ratio in the population of Midland Painted turtles but not in the population of Eastern Snapping turtles. As a whole, the sex ratios inside the wetland complex were not skewed. These results reinforce the conclusions of a previous study of a single wetland within this same complex that had found a correlation between road mortality and a male-skewed sex ratio in Midland painted turtles. We discuss population sources and sinks within the complex and the importance of protecting the overland corridors that support the safe turtle movements within this provincially significant wetland complex.
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Xu, Cheng, Jiehao Xu, Jiating Liu, Yu Chen, Øystein Evensen, Hetron Mweemba Munang’andu i Guoying Qian. "Human adenovirus penton base and encapsidation sequences detected in Pelodiscus sinensis by next generation sequencing". Future Virology 14, nr 7 (lipiec 2019): 453–60. http://dx.doi.org/10.2217/fvl-2019-0056.
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The Chinese soft-shelled turtle ( Pelodiscus sinensis) has become one of the leading cultured organisms in China and South East Asia. The objectives of the present study were to use next generation sequencing to identify viral genomes present in liver tissues from Chinese soft-shelled turtle in China. BLAST analysis of viral sequences from liver samples showed high homology with the human adenovirus (HAdV) penton base and encapsidation proteins. This homology points to possible existence of HAdV in freshwater environments used for the culture of soft-shelled turtles. Therefore, our findings merit further investigations to determine possible contamination of HAdV in aquaculture environments and the possible role of the Chinese soft-shelled turtle in transmitting HAdV to humans.
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Seburn, David C., i Hannah McCurdy-Adams. "Do turtle warning signs reduce roadkill?" Canadian Field-Naturalist 133, nr 3 (26.02.2020): 216–20. http://dx.doi.org/10.22621/cfn.v133i3.2279.
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Roadkill is a serious threat for many species of freshwater turtles. One of the most common road mitigation tools is wildlife warning signs to alert drivers. These warning signs have commonly been used for large mammals, although there is little evidence that they are effective in reducing roadkill. We tested the effectiveness of turtle warning signs at four known roadkill hotspots along a provincial highway in eastern Ontario and compared the results with four control sites on a nearby major road in a before-after-control-impact (BACI) study. We found 30 dead turtles in the four hotspots in 2017 before the signs were installed and 27 in 2018 after the signs were installed. The number of turtles killed on the road after the signs were installed did not change significantly (χ21 = 1.1, P > 0.2). Although turtle warning signs may alert some drivers, they should not be considered a replacement for more effective road mitigation tools, such as wildlife fencing and crossing structures.
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Rödel, Mark-Oliver. "Predation on tadpoles by hatchlings of the freshwater turtle". Amphibia-Reptilia 20, nr 2 (1999): 173–83. http://dx.doi.org/10.1163/156853899x00187.
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AbstractExperiments with Pelomedusa subrufa, a widespread African freshwater turtle, showed that this species consumed large quantities of tadpoles. Tadpoles preyed upon, comprised between 0.05 and 21.55% of the turtle's biomass. This demonstrated that Pelomedusa subrufa was neither gape limited nor did it ignore very small prey. Tadpoles with an ovoid body shape (Hemisus marmoratus, Hyperolius nitidulus, Ptychadena maccarthyensis), which shared, under natural conditions, the pond bottom microhabitat with the turtles, were more threatened than the robust tall-finned Kassina tadpoles that lived in the middle of the water column. The translucent, slow swimming Phrynomantis microps tadpole occurred in larger ponds and preferred the upper water column in deeper parts of the pond. This species was especially at risk in ponds with reduced water levels. Turtles, in contrast to fish or dragonfly larvae, are capable of migrating to other ponds. They therefore might have a profound regional influence on tadpole communities in ephemeral savanna ponds.
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Bower, Deborah S., Clare E. Death i Arthur Georges. "Ecological and physiological impacts of salinisation on freshwater turtles of the lower Murray River". Wildlife Research 39, nr 8 (2012): 705. http://dx.doi.org/10.1071/wr11214.
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Context The increasing intensity and extent of anthropogenically mediated salinisation in freshwater systems has the potential to affect freshwater species through physiological and ecological processes. Determining responses to salinisation is critical to predicting impacts on fauna. Aims We aimed to quantify the response of wild-caught turtles from freshwater lakes that had become saline in the lower Murray River catchment. Methods Plasma electrolytes of all three species of freshwater turtle from South Australia were compared among two freshwater sites (Horseshoe Lagoon and Swan Reach), a brackish lake (Lake Bonney) and a saline lake (Lake Alexandrina). Key results Chelodina longicollis, C. expansa and Emydura macquarii from a brackish lake had higher concentrations of plasma sodium and chloride than those from freshwater habitats. However, osmolytes known to increase under severe osmotic stress (urea and uric acid) were not elevated in brackish sites. Turtles from the highly saline lake were colonised by an invasive marine worm which encased the carapace and inhibited limb movement. Conclusions Freshwater turtles in brackish backwaters had little response to salinity, whereas the C. longicollis in a saline lake had a significant physiological response caused by salt and further impacts from colonisation of marine worms. Implications Short periods of high salinity are unlikely to adversely affect freshwater turtles. However, secondary ecological processes, such as immobilisation from a marine worm may cause unexpected impacts on freshwater fauna.
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Ayog, Janice Lynn, Mohd Radzif Taharin i Tang Zi Sheng. "Rainwater Availability Assessment for Tourism Development: A Case Study of Turtle Islands Park, Sabah". Applied Mechanics and Materials 802 (październik 2015): 575–80. http://dx.doi.org/10.4028/www.scientific.net/amm.802.575.
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This study mainly focused on the rainwater availability assessment in Turtle Islands Park, Sabah, Malaysia. Consisting of three small islands, this marine park is home to two endangered turtle species – Green and Hawkbills turtles. This special feature of the islands attracts tourist around the world, thus increasing the demand of freshwater supply for tourism development in the marine park. However, due to the shortage of freshwater from the ground due to salinity intrusion, rainwater is seen to be an alternative in fulfilling the freshwater demand. To evaluate the source of freshwater in these islands, information is obtained from the main users of the water source, which are the Sabah Park officers, the approved tour operator on the islands and the security forces. The rainwater tanks available on the islands are calculated to assess the storing capacity of rainwater. The water demand was estimated by multiplying the number of visitors with the average water usage per visitor. With the existing water tanks, this study found that the Turtle Islands Park has the ability to store 414 m3 of rainwater in Selingaan island, 3.2 m3 in Gulisaan island, and 102.1 m3 in Bakkungan Kechil island. However, the monthly water demand of each island exceeds the existing storage tanks, hence it is proposed that the number of rainwater tanks be increased to harvest as much rainfall as possible for the use of the islands’ inhabitants.
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Pace, Cinnamon M., Richard W. Blob i Mark W. Westneat. "Comparative kinematics of the forelimb during swimming in red-eared slider (Trachemys scripta) and spiny softshell (Apalone spinifera) turtles". Journal of Experimental Biology 204, nr 19 (1.10.2001): 3261–71. http://dx.doi.org/10.1242/jeb.204.19.3261.
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SUMMARYSoftshell turtles (Family Trionychidae) possess extensive webbing between the digits of the manus, suggesting that the forelimb may serve as an effective thrust generator during aquatic locomotion. However, the hindlimb has previously been viewed as the dominant propulsive organ in swimming freshwater turtles. To evaluate the potential role of the forelimb in thrust production during swimming in freshwater turtles, we compared the forelimb morphology and three-dimensional forelimb kinematics of a highly aquatic trionychid turtle, the spiny softshell Apalone spinifera, and a morphologically generalized emydid turtle, the red-eared slider Trachemys scripta. Spiny softshells possess nearly twice as much forelimb surface area as sliders for generating drag-based thrust. In addition, although both species use drag-based propulsion, several aspects of forelimb kinematics differ significantly between these species. During the thrust phase of the forelimb cycle, spiny softshells hold the elbow and wrist joints significantly straighter than sliders, thereby further increasing the surface area of the limb that can move water posteriorly and increasing the velocity of the distal portion of the forelimb. These aspects of swimming kinematics in softshells should increase forelimb thrust production and suggest that the forelimbs make more substantial contributions to forward thrust in softshell turtles than in sliders. Spiny softshells also restrict forelimb movements to a much narrower dorsoventral and anteroposterior range than sliders throughout the stroke, thereby helping to minimize limb movements potentially extraneous to forward thrust production. These comparisons demonstrate considerable diversity in the forelimb kinematics of turtles that swim using rowing motions of the limbs and suggest that the evolution of turtle forelimb mechanics produced a variety of contrasting solutions for aquatic specialization.
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Chessman, Bruce C. "Declines of freshwater turtles associated with climatic drying in Australia". Wildlife Research 38, nr 8 (2011): 664. http://dx.doi.org/10.1071/wr11108.
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Context While much attention has been paid to the effects of global temperature increases on the geographical ranges and phenologies of plants and animals, less is known about the impacts of climatically driven alteration of water regimes. Aims To assess how three species of freshwater turtle in Australia’s Murray–Darling Basin have responded to long-term decline in river flow and floodplain inundation due to climatic drying and water diversions. Methods Turtle populations were sampled in a section of the Murray River and its floodplain in 1976–82 following a wet period and in 2009–11 at the end of the most severe drought on record. Catch per unit effort, proportional abundance in different habitat types and population structure were assessed in both periods. Key results Catch per unit effort in baited hoop nets declined by 91% for the eastern snake-necked turtle (Chelodina longicollis) and 69% for the Murray turtle (Emydura macquarii), but did not change significantly for the broad-shelled turtle (Chelodina expansa). In addition, total catches from a range of sampling methods revealed a significantly reduced proportion of juvenile C. longicollis and E. macquarii in 2009–11, suggesting a fall in recruitment. Key conclusions The decline of C. longicollis was likely due mainly to drought-induced loss of critical floodplain habitat in the form of temporary water bodies, and that of E. macquarii to combined effects of drought and predation on recruitment. C. expansa seems to have fared better than the other two species because it is less vulnerable to nest predation than E. macquarii and better able than C. longicollis to find adequate nutrition in the permanent waters that remain during extended drought. Implications Declining water availability may be a widespread threat to freshwater turtles given predicted global impacts of climate change and water withdrawals on river flows. Understanding how each species uses particular habitats and how climatic and non-climatic threats interact would facilitate identification of vulnerable populations and planning of conservation actions.
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Glorioso, Brad M., Lindy J. Muse, Cory J. Hillard, Brittany R. Maldonado, Jared Streeter, Charles D. Battaglia i J. Hardin Waddle. "A Trapping Survey Targeting Head-Started Alligator Snapping Turtles in Southwest Louisiana". Journal of Fish and Wildlife Management 11, nr 2 (20.08.2020): 572–82. http://dx.doi.org/10.3996/jfwm-20-009.
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Abstract The alligator snapping turtle Macrochelys temminckii is the largest freshwater turtle in North America and humans seek it as a food source, primarily in Louisiana. Scientists point to decades of intensive commercial harvest of alligator snapping turtles as a cause of population declines. The Louisiana Department of Wildlife and Fisheries initiated a head-start program for alligator snapping turtles and released 53 head-started juveniles at seven sites along an approximately 5.7-km stretch of Bundick Creek in southwest Louisiana between November 2015 and October 2016. Before release, department personnel measured, weighed, and marked all alligator snapping turtles with both an internal passive integrated transponder tag and a numbered external tag. In 2018, the U.S. Geological Survey initiated a turtle trapping survey at those seven release sites targeting the head-started alligator snapping turtles. In 1 wk of trapping effort at each site, we recorded 69 turtle captures comprising seven species, including 15 alligator snapping turtles (representing 12 individuals). Of those 12 individuals, 8 were head-started juveniles and 4 were native to the creek. A landowner captured an additional head-started juvenile alligator snapping turtle during our trapping and we took measurements before its release. A minimum of 17% of head-started alligator snapping turtles survived since release, and we trapped most captured head-started individuals near their release site; the captured individuals exhibited growth consistent with other studies, indicating acclimatization to their new environment. Three head-started alligator snapping turtles had their external tags entangled in the net mesh, and two of these turtles drowned. An additional two head-started individuals lost their external tags in the natural environment prior to their capture in this study. The Louisiana Department of Wildlife and Fisheries discontinued the use of external tags based on our findings, as these tags were detrimental to the health of head-started turtles.
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Riley, Julia L., i Jacqueline D. Litzgus. "Cues used by predators to detect freshwater turtle nests may persist late into incubation". Canadian Field-Naturalist 128, nr 2 (6.07.2014): 179. http://dx.doi.org/10.22621/cfn.v128i2.1583.
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Previous studies have found that turtle nest depredation is concentrated immediately post-oviposition, likely because cues alerting predators to nest presence are most obvious during this time. In Algonquin Provincial Park, Ontario, we examined the frequency of nest depredation during the incubation period for Snapping Turtles (Chelydra serpentina [Linnaeus, 1758]) and Midland Painted Turtles (Chrysemys picta marginata [Agassiz, 1857]). Contrary to most past findings, nest depredation occurred throughout the incubation period for both species. In fact, 83% and 86% of depredation interactions with Snapping and Painted Turtle nests, respectively, occurred more than a week after oviposition at our study site. Peaks in nest depredation (weeks with ≥10% nest depredation) occurred late in incubation and may have coincided with hatching. Trail cameras deployed at four nesting sites revealed six predator species interacting with nests. The presence of predators at nest sites increased late in the incubation period indicating a persistence or renewal (from hatching) of cues; additional research is necessary to determine the nature of these cues. These findings have implications for both research and turtle conservation. Further research should examine the relationship between temporal changes in predator species’ density and patterns of nest depredation. Additionally, in areas where protective nest caging is used as a species recovery action, it may be important to ensure that cages remain in place throughout the incubation period until emergence of hatchlings.
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Erdélyi, Gergő, Borbála Szabó i István Kiss. "Basking Site Selection and Usage Strategies of the European Pond Turtle, Emys orbicularis (Linnaeus, 1758) in Babat valley (Gödöllő, Hungary)". Russian Journal of Herpetology 28, nr 4 (1.09.2021): 175–84. http://dx.doi.org/10.30906/1026-2296-2021-28-4-175-184.
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Sun basking is the most common method for freshwater turtles, such as the European pond turtle, to maintain optimal body temperature. The attributes of the macro- and microhabitat features around the basking sites affect the basking site selection of the European pond turtle. To protect the European pond turtle, it is important to know the basking habits among the biological characteristics of the species, along with the effects of the habitat characteristics and the choice of the type of basking sites. The purpose of our research was to detect the effects of macro- and microhabitat features on the selection of basking sites. We wanted to determine basking site type selection according to the carapace length classes and if there is any difference in the choice of basking trunks and branches with different thicknesses. Turtles choose basking sites with less closed vegetation in their environment. We have detected seasonal differences in the microhabitat features. The closing reed and Typha sp. had a negative effect on the number of observed basking turtles. The most popular type of basking sites in the pond system was the commonly occurred fallen tree trunks and branches in the water, regardless of turtle body size. Most turtles used thinner tree trunks and branches for basking. In the meantime, we found differences in the choice of basking trunks between the turtles with different body sizes. Younger turtles with smaller bodies appeared in larger numbers on emergent branches with smaller diameters.
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Carstairs, Sue J. "Evidence for low prevalence of ranaviruses in Ontario, Canada’s freshwater turtle population". PeerJ 7 (20.05.2019): e6987. http://dx.doi.org/10.7717/peerj.6987.
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BackgroundOntario, Canada is home to eight native species of turtles; all eight are federally listed as Species At Risk, due to anthropogenic threats. However, until recently, reports of infectious disease have been lacking. Ranavirus is seen as an emerging threat for ectotherms globally, with mass die-offs most often reported in amphibians. Ranavirus has been detected in Ontario’s amphibian populations, can be transmitted via water, and can be transmitted from amphibians to turtles. However, no studies on the prevalence of this virus in Ontario’s turtles have previously been carried out. With recent reports of two confirmed positive case of ranavirus in turtles in Ontario, a knowledge of the ecology of ranavirus in Ontario’s turtles has become even more important. This study estimates the prevalence of ranavirus in Ontario’s turtles, and investigates the hypothesis that this is a newly emergent disease.MethodsSixty-three samples were tested for ranavirus via PCR. These included a variety of turtle species, across their home range in Southern Ontario. Fifty-two of the samples originated from the liver and kidney of turtles who had succumbed to traumatic injuries after being admitted to the Ontario Turtle Conservation Centre; ten of the samples were taken from cloacal swabs, lesion swabs, or tail clips collected from live turtles showing signs of clinical disease. One of the live turtles was later euthanized for humane reasons and PCR was also carried out on the liver/kidney.ResultsNone of the 63 samples were found to be positive for ranavirus via PCR. The zero prevalence found in this study translates into a population prevalence estimate of less than 5%, with no change in prevalence from 2014–2018.DiscussionThis is the first report on the prevalence of ranavirus in Ontario’s turtles, and will help build an understanding of the ecology of this virus in Ontario. Ranavirus has historically been underreported in reptiles, but there has been an increase in global reports recently, most likely due to increased awareness. A carrier state is thought to exist in reptiles which makes surveillance in the population via random sampling a viable method of detection of prevalence. The first report of ranavirus in Ontario turtles occurred in 2018. This study suggests a continued low population prevalence for the years 2014–2018, however. Ongoing surveillance is necessary, as well as investigation of the eDNA presence in waterways as compared to the PCR of resident turtles, to further understand the sensitivity of these species to ranavirus infection. The utilization of qPCR would be helpful, to better quantify any positives encountered.
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Zhou, Lu, Jinhong Lei, Xiaofei Zhai, Haitao Shi i Jichao Wang. "Chinese striped-neck turtles vocalize underwater and show differences in peak frequency among different age and sex groups". PeerJ 11 (13.01.2023): e14628. http://dx.doi.org/10.7717/peerj.14628.
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Background Turtle vocalizations play an important role throughout their lives by expressing individual information (position, emotion, or physiological status), reflecting mating preferences, and synchronizing incubation. The Chinese striped-neck turtle (Mauremys sinensis) is one of the most widely distributed freshwater turtles in China, whose wild population is critically endangered. However, its vocalization has not been studied, which can be the basis for behavioral and ecological studies. Methods Five different sex–age groups of turtles were recorded underwater in a soundproof room. Cluster analysis and principal component analysis for classification of Chinese striped-neck turtle calls were unreasonable. The turtle calls were manually sought using visual and aural inspection of the recordings in Raven Pro 1.5 software and classified according to differences perceived through auditory inspection and the morphological characteristics of the spectrograms. The results of similarity analysis verified the reliability of manual classification. We compared the peak frequency of the calls among different age and sex groups. Results We identified ten M. sinensis call types, displayed their spectra and waveforms, and described their auditory characteristics. Most calls produced by the turtles were low-frequency. Some high-frequency call types, that are common in other turtle species were also produced. Similar to other turtles, the Chinese striped-neck turtle generates harmonic vocalizations. Courtship behaviors were observed when one of the call types occurred in the mixed-sex group. Adult females produced more high-frequency call types, and subadult males had higher vocalizations than other groups. These results provide a basis for future research on the function of vocalizations, field monitoring, and conservation of this species.
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Kharel, Milan, i Damodar Thapa Chhetry. "Description on some rescued turtles and their translocation at Turtle Rescue and Conservation Centre (TRCC), Sanischare, Jhapa". BIBECHANA 11 (10.05.2014): 141–48. http://dx.doi.org/10.3126/bibechana.v11i0.10394.
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The present paper deals with the brief introduction of Turtle Rescue and Conservation Centre (TRCC) and description of some rescued turtles. Nine specimens of turtles belonging to five genera were rescued and translocated to the centre till date including 9.3 kg male Indian Peacock soft-shelled turtle (Nilssonia hurum) for the first time from Jhapa district. The rescue operations were conducted for the translocation of turtles confiscated from the local market, censorial collectors, fisherman and public residence. The high resolution photographs of captured specimens, their necessary biometry and GPS coordinates of location were taken. Species identification was done with the help of and pictorial field guide and relevant literatures. Climatic data of study area were recorded from Gainde Irrigation Project, Maidhar, Jhapa. Interviews were taken during field visits with the help of structured questionnaire. Preliminary rescue data showed that the Indian flap-shelled turtle (Lissemys punctata) and Yellow bellied roofed turtle (Pangshura flaviventer) were the most overexploited species in the vicinities of the study area. The climatic condition of the rescue centre and water quality found suitable to support terrestrial and freshwater turtles and other various wetland flora and fauna. However, the rapid population growth and habitat destruction due to deforestation, unmanaged urbanization and expansion of agricultural land are found as the major threats to the survival of turtles and other wetland creatures at the study area and its vicinities. DOI: http://dx.doi.org/10.3126/bibechana.v11i0.10394 BIBECHANA 11(1) (2014) 141-148
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Ottonello, Dario, Stefania D'Angelo, Fabrizio Oneto, Stefano Malavasi, Marco Alberto Luca Zuffi i Filippo Spadola. "So close so different: what makes the difference?" Acta Herpetologica 16, nr 2 (17.09.2021): 89–98. http://dx.doi.org/10.36253/a_h-10402.
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The introduction of alien fish species in wetland ecosystems could have a great impact on freshwater communities and ecological processes. Despite fish introduction has been noticed as one of the principal cause of freshwater extinctions, ecosystem processes alteration, and change in aquatic community assemblage, very few data about impact on freshwater reptiles are available. As study model we used two neighbour sub-populations of the endangered Sicilian pond turtle, Emys trinacris, inhabiting two small, close each other and very similar lakes, except for the presence of allocthonous fish, Cyprinus carpio and Gambusia hoolbroki in one of the two. The multi-year study allowed highlighting significant differences in abundance, growth and reproductive output between the two freshwater turtle sub-populations, suggesting their influence on phenotypic plasticity of the studied population. These results are discussed in the light of previous evidence about the impact of these alien species on abundance and assemblage of the invertebrate community with an evident impact on niche width, diet composition and therefore energy intake by Emys trinacris. These data may provide important information to address management strategies and conservation actions of small wetland areas inhabited by pond turtles, pointing out a threats never highlighted up to now.
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Vignoli, Leonardo, Marco A. Bologna, Silvia Manzini, Lorenzo Rugiero i Luca Luiselli. "Attributes of basking sites of the European pond turtle (Emys orbicularis) in central Italy". Amphibia-Reptilia 36, nr 2 (2015): 125–31. http://dx.doi.org/10.1163/15685381-00002988.
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Attributes of basking sites are important elements to study in management plans of threatened freshwater turtles. Here, we analyzed the basking-site characteristics of European pond turtle (Emys orbicularis) populations in a Mediterranean territory of central Italy (Tolfa Mountains, Latium). We used logistic regression and Principal Components Analysis to characterize 29 presence sites versus 61 random sites, through 16 descriptive variables recorded within a 5 m radius from the sighting/target spot. Our analyses revealed that some variables (i.e. water turbidity, presence of small coves, submerged vegetation, and emergent tree-trunks) were those that influenced most strongly the presence of turtles on potential basking sites. Maintenance of deadwood in water and preservation of submerged aquatic vegetation should be included in the management planning for this turtle species in central Italy.
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Waltzek, Thomas B., Brian A. Stacy, Robert J. Ossiboff, Nicole I. Stacy, William A. Fraser, Annie Yan, Shipra Mohan i in. "A novel group of negative-sense RNA viruses associated with epizootics in managed and free-ranging freshwater turtles in Florida, USA". PLOS Pathogens 18, nr 3 (11.03.2022): e1010258. http://dx.doi.org/10.1371/journal.ppat.1010258.
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Few aquatic animal negative-sense RNA viruses have been characterized, and their role in disease is poorly understood. Here, we describe a virus isolated from diseased freshwater turtles from a Florida farm in 2007 and from an ongoing epizootic among free-ranging populations of Florida softshell turtles (Apalone ferox), Florida red-bellied cooters (Pseudemys nelsoni), and peninsula cooters (Pseudemys peninsularis). Affected turtles presented with similar neurological signs, oral and genital ulceration, and secondary microbial infections. Microscopic lesions were most severe in the softshell turtles and included heterophilic/histiocytic meningoencephalitis, multi-organ vasculitis, and cytologic observation of leukocytic intracytoplasmic inclusions. The virus was isolated using Terrapene heart (TH-1) cells. Ultrastructurally, viral particles were round to pleomorphic and acquired an envelope with prominent surface projections by budding from the cell membrane. Viral genomes were sequenced from cDNA libraries of two nearly identical isolates and determined to be bi-segmented, with an ambisense coding arrangement. The larger segment encodes a predicted RNA-directed RNA polymerase (RdRP) and a putative zinc-binding matrix protein. The smaller segment encodes a putative nucleoprotein and an envelope glycoprotein precursor (GPC). Thus, the genome organization of this turtle virus resembles that of arenaviruses. Phylogenetic analysis shows that the RdRP of the turtle virus is highly diverged from the RdRPs of all known negative-sense RNA viruses and forms a deep branch within the phylum Negarnaviricota, that is not affiliated with any known group of viruses, even at the class level. In contrast, the GPC protein of the turtle virus is confidently affiliated with homologs from a distinct group of fish hantaviruses. Thus, the turtle virus is expected to become the founder of a new taxon of negative-sense RNA viruses, at least with a family rank, but likely, an order or even a class. These viruses probably evolved either by reassortment or by intrasegment recombination between a virus from a distinct branch of negarnaviruses distant from all known groups and a hanta-like aquatic virus. We suggest the provisional name Tosoviridae for the putative new family, with Turtle fraservirus 1 (TFV1) as the type species within the genus Fraservirus. A conventional RT-PCR assay, targeting the TFV1 RdRP, confirmed the presence of viral RNA in multiple tissues and exudates from diseased turtles. The systemic nature of the TFV1 infection was further supported by labeling of cells within lesions using in situ hybridization targeting the RNA of the TFV1 RdRP.
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Freedberg, Steven, Michael A. Ewert, Benjamin J. Ridenhour, Maurine Neiman i Craig E. Nelson. "Nesting fidelity and molecular evidence for natal homing in the freshwater turtle, Graptemys kohnii". Proceedings of the Royal Society B: Biological Sciences 272, nr 1570 (16.06.2005): 1345–50. http://dx.doi.org/10.1098/rspb.2005.3080.
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Numerous studies of sea turtle nesting ecology have revealed that females exhibit natal homing, whereby they imprint on the nesting area from which they hatch and subsequently return there to nest as adults. Because freshwater turtles comprise the majority of reptiles known to display environmental sex determination (ESD), the study of natal homing in this group may shed light on recent evolutionary models of sex allocation that are predicated on natal homing in reptiles with ESD. We examined natal homing in Graptemys kohnii , a freshwater turtle with ESD, using mitochondrial sequencing, microsatellite genotyping and mark and recapture of 290 nesting females. Females showed high fidelity to nesting areas, even after being transplanted several kilometres away. A Mantel test revealed significant genetic isolation by distance with respect to nesting locations ( r =0.147; p <0.05), suggesting that related females nest in close proximity to one another. The patterns of fidelity and genotype distributions are consistent with homing at a scale that may affect population sex ratios.