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1
Will Helmina, Leony Regina. "Upaya Konservasi Penyu sebagai Penyelamat dari Ancaman Kepunahan dalam Perspektif Islam." Es-Syajar:Journal of Islam, Science and Technology Integration 2, no. 1 (March 23, 2024): 153–59. http://dx.doi.org/10.18860/es.v2i1.18182.
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Turtle is one of the marine fauna that is protected because its existence is threatened with extinction. The high exploitation of turtles will threaten the sustainability of turtles in the future. Turtles are hunted a lot because of the high selling value of turtle body parts. The uniqueness of the shells on turtles to be used as accessories, until they are preserved for display is a common thing. In addition, the extinction of turtles also occurs because turtles are often trapped in fishing nets and turtles are carried by strong currents to hit coral which causes many turtle carcasses to be found. Through these problems, marine environmentalists find the right solution. To cope with the extinction, turtle breeding centers were built in various coastal areas in Indonesia. Various elements of society work together in efforts to conserve turtles. As a result, there are turtle breeding sites on every coast, for example turtle conservation on Pangumbuhanbeach in West Java, turtle conservation in Bali, and turtle conservation in Banyuwangi. Allah has given the mandate to humans as stated in the Qur'an.
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Adi Eti Harnino, Taurus Zeno, I. Nyoman Yoga Parawangsa, Luthfiana Aprilianita Sari, and Sulastri Arsad. "Effectiveness of Sea Turtle Conservation Management at the Turtle Conservation and Education Center of Serangan, Denpasar Bali." Journal of Marine and Coastal Science 10, no. 1 (February 22, 2021): 18. http://dx.doi.org/10.20473/jmcs.v10i1.25604.
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Turtles are one of the reptile animals that can migrate long distances along the Indian Ocean, Pacific Ocean and Southeast Asia. The purpose of turtle migration is to mate, find spawning locations and to find food. Sea turtles have an important role in maintaining the balance of the marine ecosystem. However, the high utilization of sea turtles by humans causes the turtle population to decline. One of the conservation sites that help the government program is in Serangan, Denpasar Bali, namely the TCEC (Turtle Conservation and Education Center), where there are several types of turtles such as the lekang turtle, hawksbill and green turtle. Data collection techniques in this study used observation methods including beach monitoring, relocation of turtle eggs to semi-natural hatchery hatching, hatchling and turtle nesting as well as measurement of turtle length and width carapase curve (CCL/CCW), sand temperature, nest depth, nest diameter, nest distance and nest calculation of the number of eggs to see the success of hatching. The results are turtle conservation activities, ranging from turtle maintenance, hatching of turtle eggs, relocation of eggs, and maintenance of hatchlings to release turtles. The effectiveness given by TCEC to manage and preserve the existence of sea turtles in Indonesia, especially in the Bali region is to provide awareness to the community by not consuming eggs and turtle meat.
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Báez, José C., David Macías, Salvador García-Barcelona, and Raimundo Real. "Interannual Differences for Sea Turtles Bycatch in Spanish Longliners from Western Mediterranean Sea." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/861396.
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Recent studies showed that regional abundance of loggerhead and leatherback turtles could oscillate interannually according to oceanographic and climatic conditions. The Western Mediterranean is an important fishing area for the Spanish drifting longline fleet, which mainly targets swordfish, bluefin tuna, and albacore. Due to the spatial overlapping in fishing activity and turtle distribution, there is an increasing sea turtle conservation concern. The main goal of this study is to analyse the interannual bycatch of loggerhead and leatherback turtles by the Spanish Mediterranean longline fishery and to test the relationship between the total turtle by-catch of this fishery and the North Atlantic Oscillation (NAO). During the 14 years covered in this study, the number of sea turtle bycatches was 3,940 loggerhead turtles and 8 leatherback turtles, 0.499 loggerhead turtles/1000 hooks and 0.001014 leatherback turtles/1000 hooks. In the case of the loggerhead turtle the positive phase of the NAO favours an increase of loggerhead turtles in the Western Mediterranean Sea. However, in the case of leatherback turtle the negative phase of the NAO favours the presence of leatherback turtle. This contraposition could be related to the different ecophysiological response of both species during their migration cycle.
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Guimarães, Suzana Machado, Davi Castro Tavares, and Cassiano Monteiro-Neto. "Incidental capture of sea turtles by industrial bottom trawl fishery in the Tropical South-western Atlantic." Journal of the Marine Biological Association of the United Kingdom 98, no. 6 (March 27, 2017): 1525–31. http://dx.doi.org/10.1017/s0025315417000352.
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The five sea turtle species occurring in Brazilian waters are susceptible to threats, including incidental catches by fisheries. Studies on incidental captures in fishing gears are the main focus of several conservation actions due to high sea turtle fishery mortality worldwide. This study provides the first evaluation of incidental sea turtle catches by industrial bottom trawl fisheries operating in Brazilian waters. Four twin-trawler vessels were monitored between July 2010 and December 2011 by captains who voluntarily completed logbooks. Forty-four turtles were captured during the 1996 tows (8313 fishing hours), resulting in a catch of 5.3 ± 0.8 turtles per 1000 h per unit effort. Captured species included the loggerhead turtle (Caretta caretta, 22 individuals), olive ridley turtles (Lepidochelys olivacea, 21 individuals) and one green turtle (Chelonia mydas). Water depth was the only variable that significantly affected sea turtle captures according to Generalized Linear Models. The capture rates reported in this study ranked sixth in relation to other published studies of similar fisheries occurring worldwide. Considering the importance of this region for sea turtles, the increasing evidence of sea turtle mortality and the goals of the National Action Plan for Conservation of Sea Turtles in Brazil, it is essential to identify the main threats towards these animals and propose mitigating solutions to reduce sea turtle mortality induced by fishing activities. This study provides results that may guide future research and goals in meeting sea turtle conservation strategies.
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Myers, Andrew T., and James P. Gibbs. "Landscape-level Factors Influencing Bog Turtle Persistence and Distribution in Southeastern New York State." Journal of Fish and Wildlife Management 4, no. 2 (April 1, 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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Fadli, S. N., N. H. Idris, M. J. Osman, N. Othman, and M. H. I. Ishak. "Spatial Distribution and the Influence of Surface Temperature and Green Area on Sea Turtle Nesting Sites in Peninsular Malaysia." IOP Conference Series: Earth and Environmental Science 1240, no. 1 (September 1, 2023): 012012. http://dx.doi.org/10.1088/1755-1315/1240/1/012012.
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Abstract Malaysia is home to four of the seven sea turtles in the world, with Malaysian islands being one of the potential areas for sea turtle landing and nesting. However, sea turtles are classified as endangered species because they face extinction mainly due to land use changes, human marine activities, and environmental factors. As a result, they are now among the most important resources for ecotourism. Green turtles are the most prevalent species (endangered), while the hawksbill turtle is one of the world’s most seriously endangered marine turtle species today. Hence, considering the importance of improving turtle habitat in Malaysia, this study investigated the sea turtle’s nesting site preference in Peninsular Malaysia using spatial analysis. The objectives of this study are (1) to map sea turtle nesting sites in Peninsular Malaysia for five years (from 2017-2021) and (2) to identify the influence of surface temperature and landscape characteristics on sea turtle nesting habitats. This study used the binomial regression method to determine the significant environmental factors such as temperature, distance from the green area and the coastal line that could influence the preference for sea turtle habitat. The results show a positive relationship between temperature and that more sea turtles will nest and land in the area with the higher temperature. Also, more sea turtles prefer to land and nest near green areas. These findings confirmed the influence of green areas in turtle nesting sites in Peninsular Malaysia. It could assist the authorities in further understanding the importance of green areas in turtle nesting site preference and developing a mitigation plan to protect sea turtle habitat.
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Yudha, Donan Satria, Fidelis Triki Sadewa Aritona, and 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, no. 1 (April 14, 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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Sayuti, Mohammad, Ferliana Widasari, Ahmad Junaidi, Agung Setia Abadi, and Achmad Sofian. "EDUCATION ON HANDLING GREEN TURTLE (Chelonia mydas) INJURED DUE TO ILLEGAL ARREST OF COMMUNITY PERSONS IN SUPRAU VILLAGE." Buletin SWIMP 1, no. 02 (November 9, 2021): 047–56. http://dx.doi.org/10.15578/bs.v1i02.12.
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The number of turtle populations from year to year has decreased. One of the causes is the arrests made by the community for consumption purposes. On April 29, 2021, a green turtle was eaten by the Directorate of Polair, Sorong City, with an injured condition that will be used as food for consumption. The purpose of this activity is to educate the public on the handling of injured turtles and socialize related to turtle conservation. The method of turtle handling activities is direct daily care with medication and turtle feeding programs, while socialization activities are carried out with mini workshops attended by representatives of the Marine and Fisheries Resources Supervisor, Sorong Marine and Fisheries Polytechnic, Directorate of Polair Sorong City, West Papua Natural Resources Conservation Center, Sorong District Court, Sailing Science Education and Training Center, Sorong City Fisheries Service, Papua Turtle Foundation, Conservation International (CI) and Nusantara Nature Conservation Foundation and public figure. The results of the activities for handling injured turtles, healthy turtles returned with dry wounds so that the turtles could be released into the wild. The socialization activity went smoothly with increasing understanding regarding the importance of turtle conservation by the community by signing a Memorandum of Understanding related to turtle conservation.
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Dupuis-Desormeaux, Marc, Christina Davy, Amy Lathrop, Emma Followes, Andrew Ramesbottom, Andrea Chreston, and Suzanne E. MacDonald. "Colonization and usage of an artificial urban wetland complex by freshwater turtles." PeerJ 6 (August 8, 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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Weir, Caroline R., Tamar Ron, Miguel Morais, and Agostinho Domingos C. Duarte. "Nesting and at-sea distribution of marine turtles in Angola, West Africa, 2000–2006: occurrence, threats and conservation implications." Oryx 41, no. 2 (April 2007): 224–31. http://dx.doi.org/10.1017/s003060530700186x.
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AbstractThe status of marine turtles in Angola, West Africa, is poorly known, and therefore during 2000–2006 a combination of both dedicated and opportunistic beach and at-sea turtle surveys were carried out, and interviews conducted with fishing communities and at markets. Green Chelonia mydas, olive ridley Lepidochelys olivacea, leatherback Dermochelys coriacea and loggerhead turtles Caretta caretta were recorded, and nesting of the first three species confirmed during September–March (peaking November–December). Green turtles nested mainly in the south, leatherback turtles in north and central Angola, and olive ridley turtle nesting was widespread. Olive ridley turtle nest density at Palmeirinhas averaged 32 nests km−1. At-sea surveys produced 298 turtle records, with peak occurrence during August. Significant anthropogenic-related mortality (including exploitation of meat and eggs and fishing bycatch) was recorded, in addition to natural predation and other threats. Maintenance of the long-term sustainability of these turtle populations should focus on the involvement of fishing communities and increasing awareness throughout Angola.
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I Komang Arya Sentana Mahendra, Anak Agung Sagung Laksmi Dewi, and Luh Putu Suryani. "Penegakan Hukum Terhadap Tindak Pidana Penyelundupan Penyu sebagai Satwa Terlindungi di Bali." Jurnal Interpretasi Hukum 2, no. 2 (June 18, 2021): 384–90. http://dx.doi.org/10.22225/juinhum.2.2.3445.384-390.
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Prohibition of all exploitation of protected animals. Even in the territory of Indonesia, turtle smuggling still occurs, especially in Bali Province where turtle smuggling often occurs. The purpouses of this research are to analyze the legal protection of turtles as protected animals and the criminal sanctions against the perpetrators of turtle smuggling as protected animals? The research method used is normative law, with statutory apporoach and conceptual approach. The results of the research show that forms of legal protection against turtles, if from the international agreement with the CITES agreement (Convention on International Trade in Endangered Species), in Indonesia there are 6 out of 7 types of turtles in the world that are protected under the turtle species law. existing in the protected world based on the law on the determination of wild protected animals, and the forms of sanctions against people who smuggle turtles as protected animals are in the form of administrative sanctions, civil sanctions and criminal sanctions. There are no specific criminal sanctions against turtle smugglers, these sanctions are still incorporated in Law No. 5 of 1990, concluded that legal protection and sanctions against turtles as protected animals in the form of administrative, civil and criminal sanctions, specifically in Bali there are no criminal sanctions against turtle smugglers.
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Hossain, M. A., M. S. E. Mahfuj, S. M. A. Rashid, and M. N. Ahsan. "Present status of conservation and management of sea turtle in Cox’s Bazar district, Bangladesh." Mesopotamian Journal of Marine Sciences 28, no. 1 (April 18, 2022): 45–60. http://dx.doi.org/10.58629/mjms.v28i1.154.
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The study was conducted to know the present status of conservation and management of sea turtle in Cox’s Bazar district, Bangladesh. Two species of sea turtles have been making nest in Bangladesh. A total of 251 turtle individuals were found. The highest nesting frequency of Olive ridley (108) and Green turtles (10) were observed in February. About 21,942 hatchlings were produced and released by the hatcheries for conservational step. A total of one hundred people were selected randomly for taking interview to assess their knowledge and attitude towards sea turtle conservation and management. Most of the respondents were fishermen (55%), student and housewife were 20% and 8%, 5% were found involving in business and rest 12% were involved in others activities. About 45% of the respondents thought that turtles were beneficial while other 40% of the respondents thought turtles were harmful. The rest of the respondents (15%) answered that they were not sure whether sea turtle was beneficial or harmful. Most of the fishermen did not know about Turtle Excluder Devices (TEDs) or its uses. It was found that the nesting of sea turtles was reducing and there was lack of knowledge among the people of the study area about the importance of sea turtle conservation and management.
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Arthur, Karen E., Judith M. O'Neil, Colin J. Limpus, Kyler Abernathy, and Greg Marshall. "Using Animal-Borne Imaging to Assess Green Turtle (Chelonia mydas) Foraging Ecology in Moreton Bay, Australia." Marine Technology Society Journal 41, no. 4 (December 1, 2007): 9–13. http://dx.doi.org/10.4031/002533207787441953.
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Traditional techniques for studying green turtle foraging ecology, such as the analysis of food availability and ingested dietary material, have concluded that green turtles are primarily herbivorous but selective foragers. However, green turtles that forage during Lyngbya majuscula blooms are exposed to toxins produced by the cyanobacterium overgrowing the seagrass. We used the Crittercam, an animal-borne imaging device, to observe green turtle foraging behavior in Moreton Bay, Australia, and to evaluate the system for assessing the impacts of Lyngbya blooms on green turtles. Eight large green turtles were captured while foraging on seagrass flats and each was fitted with a Crittercam. The deployments yielded over 28 hours of video and associated time-depth records. Turtles swam almost continuously and rarely stopped to feed on seagrass. Six turtles were observed feeding and all six consumed gelatinous animals from the water column. This prey source was previously undocumented in the Moreton Bay green turtle population but described in other green turtle populations using the Crittercam. Only one turtle was observed foraging on seagrass. The results of this study indicate that Crittercam technology can provide insight into turtle diet selection and that it will be a useful tool in identifying the impacts of Lyngbya blooms on green turtle feeding ecology. This study has also demonstrated that turtles in Moreton Bay may have a more flexible diet than previously described, indicating they could potentially supplement their diet with alternate prey items when seagrass quality or quantity is compromised. Longer deployment times, with an initial acclimation phase, are required to more fully understand questions pertaining to feeding ecology.
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Hirth, Harold F., and Deborah L. H. Rohovit. "Marketing patterns of green and hawksbill turtles in Port Moresby, Papua New Guinea." Oryx 26, no. 1 (January 1992): 39–42. http://dx.doi.org/10.1017/s0030605300023218.
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Of the six species of marine turtle in Papua New Guinea, the green turtle Chelonia mydas and the hawksbill turtle Eretmochelys imbricata are the most common and the most utilized in the Port Moresby region. This paper describes a study carried out in 1989, which monitored the trade in green turtles in the country's main market and the sale of tortoiseshell in a major shopping centre. The price of turtle meat was higher than that of some common reef fish, but cost less when fish was abundant. The commercial trade in tortoiseshell appeared to be negligible. As the urban population increases it is likely that demand for turtle meat will also increase. If this food resource is to be managed sustainably the size of the turtle population needs to be determined. The University of Papua New Guinea is supporting marine turtle field studies and a sea turtle education programme, but more needs to be done to ensure the survival of PNG's marine turtles.
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Xu, Cheng, Jiehao Xu, Yu Chen, Øystein Evensen, Hetron Mweemba Munang’andu, and Guoying Qian. "Immunization with Bovine Serum Albumin (BSA) in Oil-Adjuvant Elicits IgM Antibody Response in Chinese Soft-Shelled Turtle (Pelodiscus Sinensis)." Vaccines 8, no. 2 (May 29, 2020): 257. http://dx.doi.org/10.3390/vaccines8020257.
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Immunoassays are among the frontline methods used for disease diagnosis and surveillance. Despite this, there are no immunoassays developed for the Chinese soft-shelled turtle (Pelodiscus sinensis), which has expanded into large scale commercial production in several Asian countries. One of the critical factors delaying the development of immunoassays is the lack of characterized soft-shelled turtle immunoglobulins. Herein, we used mass spectrometry together with the ProtQuest software to identify the soft-shelled turtle IgM heavy chain in serum, which again was used to produce a polyclonal anti-turtle-IgM in rabbits. Thereafter, the polyclonal anti-turtle-IgM was used as a secondary antibody in an indirect ELISA to evaluate antibody responses of soft-shelled turtles injected with the bovine serum albumin (BSA) model antigen. Our findings show that only turtle immunized with a water-in-oil BSA plus ISA 763A VG adjuvant (SEPPIC, France) emulsion had antibodies detected at 42 days post vaccination (dpv) while turtles injected with phosphate buffered saline (PBS) only as well as turtle injected with BSA dissolved in PBS had no significant antibody levels detected in serum throughout the study period. In summary, our findings show that rabbit polyclonal anti-turtle-IgM produced can be used in ELISA to measure serum antibody responses in immunized soft-shelled turtles. Future studies should explore its application in other immunoassays needed for the disease diagnosis and vaccine development for soft-shelled turtles.
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Werneck, M. R., and R. J. Da Silva. "Checklist of sea turtles endohelminth in Neotropical region." Helminthologia 53, no. 3 (September 1, 2016): 211–23. http://dx.doi.org/10.1515/helmin-2016-0045.
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SummaryThis paper presents a list of parasites described in sea turtles from the Neotropical region. Through the review of literature the occurrence of 79 taxa of helminthes parasites were observed, mostly consisting of the Phylum Platyhelminthes with 76 species distributed in 14 families and 2 families of the Phylum Nematoda within 3 species. Regarding the parasite records, the most studied host was the green turtle (Chelonia mydas) followed by the hawksbill turtle (Eretmochelys imbricata), olive ridley turtle (Lepidochelys olivacea), loggerhead turtle (Caretta caretta) and leatherback turtle (Dermochelys coriacea). Overall helminths were reported in 12 countries and in the Caribbean Sea region. This checklist is the largest compilation of data on helminths found in sea turtles in the Neotropical region.
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Browne, Constance L., S. Andrew Sullivan, and Donald F. McAlpine. "Freshwater turtle by-catch from angling in New Brunswick, Canada." Canadian Field-Naturalist 134, no. 3 (November 28, 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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Rumbay, Julia Angel, Roni Koneri, Marnix Langoy, Eko Handoyo, and Pandu Wijaya. "Persepsi Kelompok Pemandu Wisata Terhadap Konservasi Penyu di Pesisir Pulau Bunaken, Taman Nasional Bunaken, Manado, Sulawesi Utara." Jurnal MIPA 11, no. 1 (February 11, 2022): 38. http://dx.doi.org/10.35799/jm.v11i1.38902.
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Public perception of turtle conservation in an area will determine the success of turtle conservation activities. This study aims to analyze the perception of tour guide groups towards turtle conservation on the coast of Bunaken Island, Bunaken National Park, Manado, North Sulawesi. The research method was carried out by means of observation and surveys. Collecting data in the form of interviews with a questionnaire guide. The selection of respondents was carried out by purposive sampling with the target group of tour guides, especially dive guides. Data analysis was carried out using a qualitative descriptive method. The results showed that most of the respondents (78%) already understand about turtle conservation and no longer consume turtles (100%). The turtle habitat which includes coral reefs and seagrasses still supports the presence of turtles and turtles are almost visible at all observation locations. The understanding of turtle conservation by dive guides is quite good, but to maintain the sustainability of conservation so that it is maximized, it is necessary to provide guidance and supervision to the diving guides and also to the surrounding community.
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Li, Min, Cuijuan Niu, and Yixuan Chen. "Diverse Response Pattern to Anoxia in Three Freshwater Turtle Species." Biology 12, no. 1 (December 27, 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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Mosnier, A., J. F. Gosselin, J. Lawson, S. Plourde, and V. Lesage. "Predicting seasonal occurrence of leatherback turtles (Dermochelys coriacea) in eastern Canadian waters from turtle and ocean sunfish (Mola mola) sighting data and habitat characteristics." Canadian Journal of Zoology 97, no. 5 (May 2019): 464–78. http://dx.doi.org/10.1139/cjz-2018-0167.
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Part of the western Atlantic population of leatherback turtles (Dermochelys coriacea (Vandelli, 1761)) forage in Canadian waters, where high-use areas have been identified using satellite telemetry and opportunistic sightings. Here, we use sightings of leatherback turtles and ocean sunfish (Mola mola (Linnaeus, 1758)) obtained during a systematic large-scale aerial survey, along with opportunistic turtle sightings, to examine the seasonal occurrence and distribution of leatherback turtles in eastern Canada. Using environmental correlates, we predict the spatial and seasonal development of potentially suitable habitats. All data sets confirmed the presence of leatherback turtles off Nova Scotia during summer. They also highlighted turtle occurrence off southern Newfoundland. Opportunistic sightings suggest a seasonal shift in main turtle concentrations from southwest to northeast, with use of southern Newfoundland waters extending into September. A generalized additive model linking environmental characteristics and turtle observations suggests adding the Grand Banks off Newfoundland and waters east of Anticosti Island in the Gulf of St. Lawrence to the potentially important habitat for leatherback turtles. Direct observations helped delineate habitat currently used by leatherback turtles. In the context of climate change, this modelling approach may improve our ability to forecast changes in turtle habitat suitability and the risks of entrapment or collision associated with potentially changing usage patterns.
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Sunardi, Sunardi, Anton Yudhana, Azrul Mahfurdz, and Sharipah Salwa Mohamed. "Echo voltage reflected by turtle on various angles." International Journal of Advances in Intelligent Informatics 1, no. 1 (March 31, 2015): 48. http://dx.doi.org/10.26555/ijain.v1i1.9.
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This research proposes the acoustic measurement by using echo sounder for green turtle detection of 1 year, 12 and 18 years. Various positions or angles of turtles are head, tail, shell, lung, left and right side. MATLAB software and echo sounder are used to analyse the frequency and the response of the turtle as echo voltage and target strength parameter. Based on the experiment and analysis have been conducted, the bigger size of the turtle, the higher echo voltage and target strength. The target strength of turtle for lung and shell for all ages are -26.52 dB and –26.17 dB respectively. The target strength of turtles in this research is different with target strength of fish in our previous research. Therefore, for future research, the repellant system based on differences of target strength the turtle and fish for avoided the turtle trapping in the net can be implemented to protect the population of turtle from extinction
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Tarigan, Aditya P., Ricardo F. Tapilatu, and Marthin Matulessy. "Suhu inkubasi, pasir pantai peneluran dan sukses penetasan telur penyu pada sarang semi alami di Pantai Warebar - Yenbekaki Distrik Waigeo Timur, Kabupaten Raja Ampat." Cassowary 3, no. 1 (May 15, 2020): 21–31. http://dx.doi.org/10.30862/casssowary.cs.v3.i1.36.
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The research took place between May and October 2019, and divided into two stages. The first stage was field research to collect data by identifying turtles, calculating hatching successes, measuring the temperature of the nesting beach and nest temperature of each species of turtle in semi-natural nests at Warebar Beach, Yenbekaki village, East Waigeo Sub District, Raja Ampat. The second stage after the field was conducting an analysis of hatching rate in hatchery, sand temperature and nest temperature for each species of turtle. The species of turtles nesting at Warebar Beach are olive-ridley (Lepidochelys olivacea) and hawksbill (Eretmochelys imbricata) turtles. Based on the measurement results at semi-natural nests, it was obtained that the hatching rate of olive ridley sea turtle was 71.6%±28.3 (X±SD) and hawksbill sea turtle was 59.8%±41.3, the overall mean temperature of nesting beach was 28oC, the mean incubation temperature for both sea turtle species was 31oC.
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Febrinal, Febrinal, Azzahrah Khairunnisa Mardhiyah, Maysyarah Ardiana, Zultsatunni’mah Zultsatunni’mah, Pati Hariyose, and FITRA ARYA DWI NUGRAHA. "Sosialization of Sea Turtle Under Threatened in Pasir Jambak." Pelita Eksakta 2, no. 2 (November 30, 2019): 148. http://dx.doi.org/10.24036/pelitaeksakta/vol2-iss2/72.
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All sea turtles are listed as endangered and critically endangered by IUCN Red List due to human consumption and lifestyle. In West Sumatra, Pasir Jambak Beach is an important habitat for nesting of sea turtles, but human activities in this area becomes serious threats for sea turtles. Based on our interview, the local people of Pasir Jambak still consume the sea turtle eggs and mistaken for the effect of this egg to human. During our activity, we share our knowledge especially to the children of Pasir Jambak, hoping that they will not continue the habit of consuming the sea turtle egg, and become more concerned to the conservation of sea turtle around them. All of us were responsible for the rapid decline of sea turtle populations. We also take an action for cleaning the Pasir Jambak beach from the plastic trash and released the Tukik (juvenile) to help increasing the sea turtle population in nature.
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Mascovich, Katie A., Lincoln R. Larson, and Kimberly M. Andrews. "Talking Turtles With Tourists: Evaluating the Relative Conservation Impacts of Different Types of Sea Turtle Education Programs at Jekyll Island, GA, USA." Journal of Interpretation Research 28, no. 1 (April 2023): 95–120. http://dx.doi.org/10.1177/10925872231157608.
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We used a pre-post survey approach to compare learning and conservation-focused behavioral outcomes for tourists participating in two different types of field-based wildlife education programs at the Jekyll Island Authority Georgia Sea Turtle Center (GSTC) on Jekyll Island, GA, USA: a low-interaction program ( n = 59) led by education guides that featured minimal direct contact between visitors and sea turtles, and a high-interaction program ( n = 42) led by turtle biologists that featured more intimate interactions between visitors and turtles. Both programs revealed comparable positive effects on participants’ knowledge of sea turtles and intent to engage in turtle advocacy behaviors, but neither type of program had a major influence on pro-turtle attitudes or participation in turtle-friendly beach behaviors (partly because scores for these variables were high entering the program). Results suggest managers and educators at wildlife tourism destinations could employ different program delivery methods while still achieving similar education and conservation goals.
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Pratama, Vian Dedi, Sukandar Sukandar, Marjono Marjono, and Andi Kurniawan. "Suitability Analysis of Habitat and Ecotourism of Olive Ridley Sea Turtle (Lepidochelys olivacea) in Development of Turtle Conservation Strategy at Taman Kili-Kili Beach." Economic and Social of Fisheries and Marine Journal 009, no. 01 (October 28, 2021): 86–100. http://dx.doi.org/10.21776/ub.ecsofim.2021.009.01.07.
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Taman Kili-Kili Beach is designated as an Essential Ecosystem Area (KEE). 188/39/KPTS/013/2020. According to the Supervisory Community Group (Pokmaswas), in 2011-2020, there was an increase in broodstock as many as 52 turtles, and the eggs saved as many as 3323 eggs. However, since 2013 Pokmaswas data shows a decrease in the population of hawksbill and green turtles in turtle conservation areas, which is thought to be caused by climate change, global warming, and animals. This study aims to analyze environmental baselines, turtle populations, and the value of turtle ecotourism (ecological, economic values) and develop strategies to support turtle conservation at Taman Kili-Kili Beach Trenggalek Regency. The results of the adjustment of nesting habitats and turtle ecotourism, calculation of the Habitat Conformity Index (IKH) of turtle nesting, IKH = 77.77%, which belongs to the category (S1) is very suitable to be used as a conservation area and turtle nesting habitat. While the results of the calculation of the Turtle Ecotourism Conformity Index (IKW), IKW = 84.93%, which is included in the (S1) category, which is very suitable for use a turtle tourism area. The strategy for developing turtle ecotourism is in quadrant II, meaning that it utilizes the strengths possessed in the turtle conservation area by minimizing the threats that it will experience.
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Carstairs, Sue, Marc Dupuis-Desormeaux, and Christina M. Davy. "Revisiting the hypothesis of sex-biased turtle road mortality." Canadian Field-Naturalist 132, no. 3 (April 11, 2019): 289–95. http://dx.doi.org/10.22621/cfn.v132i3.1908.
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Road mortality poses a major threat to turtle populations. Several studies have suggested that the terrestrial movements associated with nesting increase this risk for females. The Ontario Turtle Conservation Centre (OTCC) is home to the Kawartha Turtle Trauma Centre, which admits 900 or more turtles a year, with road injuries the primary cause of admission. We tested the hypothesis that road mortality in turtles is female-biased using data from injured Midland Painted Turtles (Chrysemys picta marginata), Snapping Turtles (Chelydra serpentina), Blanding’s Turtles (Emydoidea blandingii), and Northern Map Turtles (Graptemys geographica) collected over about 126 000 km2 and admitted to OTCC’s hospital from January 2013 to October 2017. There was no difference in the number of male and female admissions of Midland Painted, Blanding’s, or Snapping Turtles (P > 0.05); however, more female Northern Map Turtles than males were admitted (P < 0.001). Admission of female turtles peaked in June during the nesting season, but male admissions were more evenly distributed throughout the season. Our admissions data provide a temporally unbiased and geographically broad snapshot of turtle–vehicle interactions that can directly inform conservation and management policies. Although our data are not equivalent to mortality rates, these results demonstrate that vehicle strikes can have a substantial impact on both female and male turtles.
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Sterli, Juliana. "A new, nearly complete stem turtle from the Jurassic of South America with implications for turtle evolution." Biology Letters 4, no. 3 (March 10, 2008): 286–89. http://dx.doi.org/10.1098/rsbl.2008.0022.
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Turtles have been known since the Upper Triassic (210 Myr old); however, fossils recording the first steps of turtle evolution are scarce and often fragmentary. As a consequence, one of the main questions is whether living turtles (Testudines) originated during the Late Triassic (210 Myr old) or during the Middle to Late Jurassic ( ca 160 Myr old). The discovery of the new fossil turtle, Condorchelys antiqua gen. et sp. nov., from the Middle to Upper Jurassic ( ca 160–146 Myr old) of South America (Patagonia, Argentina), presented here sheds new light on early turtle evolution. An updated cladistic analysis of turtles shows that C. antiqua and other fossil turtles are not crown turtles, but stem turtles. This cladistic analysis also shows that stem turtles were more diverse than previously thought, and that until the Middle to Upper Jurassic there were turtles without the modern jaw closure mechanism.
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Kennett, Rod, N. Munungurritj, and Djawa Yunupingu. "Migration patterns of marine turtles in the Gulf of Carpentaria, northern Australia: implications for Aboriginal management." Wildlife Research 31, no. 3 (2004): 241. http://dx.doi.org/10.1071/wr03002.
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Marine turtles regularly migrate hundreds to thousands of kilometres between nesting beaches and home foraging grounds. Effective conservation of marine turtles requires understanding of migration patterns in order to facilitate regional cooperation across the turtles' migratory range. Indigenous Australians maintain traditional rights and responsibilities for marine turtle management across much of the northern Australian coast. To better understand turtle migrations and identify with whom the Aboriginal people of north-east Arnhem Land (Yolngu) share turtles, we used satellite telemetry to track the migration routes of 20 green turtles (Chelonia mydas) departing from a nesting beach ~45 km south of Nhulunbuy, north-east Arnhem Land, Northern Territory, Australia. All tracked turtles remained within the Gulf of Carpentaria. These results suggest that the foraging habitat for adults of this nesting population may be largely confined to the Gulf, offering an optimistic scenario for green turtle conservation. Given these results and the critical role indigenous people play in conserving and managing marine turtles, we recommend that a formal network of indigenous communities be established as the foundation of a community-based turtle-management strategy for the Gulf of Carpentaria region.
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Rakotonirina, Berthin, and Andrew Cooke. "Sea turtles of Madagascar – their status, exploitation and conservation." Oryx 28, no. 1 (January 1994): 51–61. http://dx.doi.org/10.1017/s0030605300028295.
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Five species of sea turtles are known from Madagascar's coastal waters. Fishermen on the western and south-western coasts take green turtle Chelonia mydas, loggerhead turtle Caretta caretta and olive ridley Lepidochelys olivacea for their meat. The hawksbill turtle Eretmochelys imbricata is taken mainly for its shell and for making stuffed specimens while the leatherback Dermochelys coriacea is seldom caught. Anecdotal evidence of fishermen and dealers in turtle products, measurement of captured animals and personal observations of the authors all point to declines in numbers and average size for green and hawksbill turtles, coupled with marked declines in nesting rates for these and the olive ridley.
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Glorioso, Brad M., Allison J. Vaughn, and J. Hardin Waddle. "The Aquatic Turtle Assemblage Inhabiting a Highly Altered Landscape in Southeast Missouri." Journal of Fish and Wildlife Management 1, no. 2 (November 1, 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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Maldonado-Gasca,, A., and M. Zapata-Rosales. "PRIMEROS REGISTROS DE TORTUGAS BLANCAS Chelonia mydas CON FIBROPAPILOMAS, EN YUCATÁN, MÉXICO." CICIMAR Oceánides 22, no. 1-2 (December 31, 2007): 29. http://dx.doi.org/10.37543/oceanides.v22i1-2.35.
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First reports of green turtles Chelonia mydas with fibropapillomas, in Yucatán, México Fibropapillomas are cutaneous tumors that affect the health of marine turtles worldwide. In July 11th of 1998, a juvenile green turtle (Chelonia mydas) with tumors was captured by fishermen in the Sea Turtles Sanctuary of Rio Lagartos, Yucatán. The straight carapace length of this turtle was 44.6 cm, and we found 30 tumors with a size from 1 cm - 10 cm on the back flippers, neck, front flippers and in both eyes. On July 10th, 1999, another juvenile green turtle with fibropapillomatosis was captured by fishermen in the same area. This turtle was smaller (S.C.L. = 40.8 cm) with 5 small tumors (1 cm - 4 cm) on the back flippers and tail. The prevalence of fibro papillomatosis in Yucatan is low (2.4%). Considering the migratory route of this species and the high prevalence of green turtles with fibropapillomas in Florida, USA, we suggest an initial contagion between the populations of these peninsulas. Those are the first documented reports of green turtles with fibropapillomas in Yucatán, México.
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Maldonado-Gasca,, A., and M. Zapata-Rosales. "PRIMEROS REGISTROS DE TORTUGAS BLANCAS Chelonia mydas CON FIBROPAPILOMAS, EN YUCATÁN, MÉXICO." CICIMAR Oceánides 22, no. 1-2 (December 31, 2007): 29. http://dx.doi.org/10.37543/oceanides.v22i1-2.35.
Full textAbstract:
First reports of green turtles Chelonia mydas with fibropapillomas, in Yucatán, México Fibropapillomas are cutaneous tumors that affect the health of marine turtles worldwide. In July 11th of 1998, a juvenile green turtle (Chelonia mydas) with tumors was captured by fishermen in the Sea Turtles Sanctuary of Rio Lagartos, Yucatán. The straight carapace length of this turtle was 44.6 cm, and we found 30 tumors with a size from 1 cm - 10 cm on the back flippers, neck, front flippers and in both eyes. On July 10th, 1999, another juvenile green turtle with fibropapillomatosis was captured by fishermen in the same area. This turtle was smaller (S.C.L. = 40.8 cm) with 5 small tumors (1 cm - 4 cm) on the back flippers and tail. The prevalence of fibro papillomatosis in Yucatan is low (2.4%). Considering the migratory route of this species and the high prevalence of green turtles with fibropapillomas in Florida, USA, we suggest an initial contagion between the populations of these peninsulas. Those are the first documented reports of green turtles with fibropapillomas in Yucatán, México.
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Rauzana, Anita, Lenni Fitri, Yekki Yasmin, Suwarno Suwarno, and Wira Dharma. "Konservasi Penyu Di Pantai Pasi Jalang, Lhoknga, Kabupaten Aceh Besar." COMSEP: Jurnal Pengabdian Kepada Masyarakat 4, no. 3 (October 9, 2022): 266–72. http://dx.doi.org/10.54951/comsep.v3i3.309.
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The Lhoknga beach area is one of the areas in Aceh that has beautiful beaches and enormous potential for marine wealth, including turtles. This area is a paradise for turtles to lay their eggs. Turtles are reptiles living in the sea and whose existence has long been threatened by nature and human activities. Internationally, sea turtles are included in the 'red list' in the International Union for Conservation of Nature and Natural Resources (IUCN), which means that their existence in nature is threatened with extinction, so all forms of utilization and distribution must receive serious attention. Therefore, turtle conservation efforts are an essential and urgent program to protect and save turtle populations, especially in Indonesia because, in Indonesia, there are 6 out of 7 turtle species that still exist today. This activity has been completed at Lhoknga Beach by releasing 120 turtle hatchlings. It is hoped that this community service activity will be able to increase public awareness to participate together in preserving turtles and not hunting them anymore.
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Julyansyah, Teddy, Deddy Bakhtiar, and Ari Anggoro. "Analisis Akustik Target Strength Penyu Hijau (Chelonia Mydas) Melalui Pengukuran Secara Terkontrol Pada Frekuensi 200 kHz." Barakuda 45: Jurnal Ilmu Perikanan dan Kelautan 3, no. 2 (November 30, 2021): 94–108. http://dx.doi.org/10.47685/barakuda45.v3i2.158.
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ABSTRACT
Turtles are reptiles that live in the sea and are able to migrate over long distances along the Indian Ocean, Pacific Ocean and Southeast Asia. Currently the number of turtle populations in nature has greatly decreased. This population decline is caused by natural factors and human activities that endanger the population directly or indirectly. At this time the tagging set technique (ID tag code) is a method that is often used to detect the presence of turtles by attaching tags to female turtles who are landing to lay eggs on the beach or while in captivity or the discovery of the mother turtle by fishermen. One other method that can be used to detect the presence of turtles is to use the acoustic method. The purpose of this study was to analyze the characteristics of the acoustic backscattering energy of the green turtle (Chelonia mydes) and to analyze the relationship between target strength and total body length of the green turtle (Chelonia mydas). This research was conducted in the Tapak Paderi waters pond, Bengkulu City, in August-October 2020. The average target strength (TS) value for green turtles was -48.07 dB. Based on the regression equation, the value of determination (R2) obtained is 0.78. Where this value shows that the total length of the green turtle has an effect of 78% on the average target strength (TS) value, while for 22% it is caused by other factors such as body shape, environmental factors and other factors. Based on the ANOVA test, it can be concluded that there is a relationship between the total length and the value of the target strength (TS) on the green turtle or the value of the total length has an influence on the value of the target strength (TS) on the green turtle.
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Delu, Vikram, Vinod Karwasra, and Ashish Panda. "Conservation of two freshwater turtle species in the Guru Gorakhnath Community Reserve in Western Haryana, India." Reptiles & Amphibians 31, no. 1 (April 14, 2024): e20609. http://dx.doi.org/10.17161/randa.v31i1.20609.
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The active involvement of local communities in conservation efforts is pivotal in ensuring the long-term protection and preservation of our natural environment. In the village of Kajalheri, located in Fatehabad district, the environmentally conscious Bishnoi community has been engaged in the conservation of the Indian soft-shell turtle (Nilssonia gangetica) population in the village pond for nearly a century. As a testament to their efforts, the pond was officially designated as a community reserve in 2019 to safeguard these turtles. Previously, the Indian soft-shell turtle was the sole known species inhabiting this small pond. However, our observations from 2021 to 2023 have revealed the presence of two additional turtle species, namely the Indian tent turtle (Pangshura tentoria) and the Indian roofed turtle (Pangshura tecta). No study on freshwater turtles specific to the Haryana region has been carried out. Therefore, baseline data on the diversity and distribution of freshwater turtles is scanty in the state. This scientific inquiry provides valuable insights into effective habitat management strategies and instils hope for identifying similar sites within the forest-deficient state of Haryana.
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Karson, Alyson, Siow Yan Jennifer Angoh, and Christina M. Davy. "Depredation of gravid freshwater turtles by Raccoons (Procyon lotor)." Canadian Field-Naturalist 132, no. 2 (January 1, 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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Chou, Wei-Rung, Po-Yu Wu, and Tsung-Hsien Li. "Assessing the Relationship between Sea Turtle Strandings and Anthropogenic Impacts in Taiwan." Journal of Marine Science and Engineering 11, no. 10 (October 11, 2023): 1962. http://dx.doi.org/10.3390/jmse11101962.
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Data acquired from stranded sea turtles can provide awareness of human activities that adversely affect sea turtle populations. We assessed strandings of five sea turtle species between 2017 and 2021. This study utilizes principal component analysis (PCA) and structural equation modeling (SEM) to reveal potential causes of sea turtle strandings linked to anthropogenic effects in Taiwan. Although our study did not observe a statistically significant impact of offshore wind turbines on sea turtle strandings, it did find evidence of a significant direct effect of coral colony density, heavy metals, and fishing disturbance on such strandings. For the conservation of endangered sea turtles, we recommend the incorporation of PCA and SEM in further contexts for validating anthropogenic impact assessments.
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Jribi, Imed, Abderrahmen Bouain, Khaled Echwikhi, and Mohamed Nejmeddine Bradai. "Effect of bait on sea turtles bycatch rates in pelagic longlines: An overview." Amphibia-Reptilia 32, no. 4 (2011): 493–502. http://dx.doi.org/10.1163/156853811x601924.
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AbstractPelagic longline fishing has been identified as a significant threat to endangered sea turtle populations. Reducing sea turtle bycatch in pelagic longline fisheries, in concert with activities to reduce other anthropogenic mortality sources, may halt and reverse population declines. Here, we examine the effect of bait manipulation as a simple mitigation method that could reduce sea turtle interactions with longline fishing gear. We analyzed laboratory experiments and field trials conducted in the Mediterranean, the northeast Distant Area in the Atlantic and the Western North Pacific. Studies showed that turtles are more likely to feed on squid than on mackerel when both are used simultaneously as bait. The stingray, Dasyatis pastinaca, used as bait, was more effective than mackerel; this ray was vulnerable and stimulated much thought about other species to use as alternative bait. Effective in laboratory conditions with captive turtles, dyed and artificial bait did not seemed to be effective in reducing turtle bycatch in field conditions. Optimal mitigation measure must reduce incidence of hooking of threatened sea turtles to acceptable levels and also offer an economic advantage to fisheries. Studies concerning the effect of bait modification to reduce turtle bycatch highlight the importance of an integrated approach towards sensory deterrents, as both visual and chemical cues are likely to attract sea turtles to longline gear. Further research on the development of sensory-based deterrents can contribute to reduced sea turtle bait interactions and maintain catch rates of target species.
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Rodriguez, AR, and KL Heck Jr. "Green turtle herbivory and its effects on the warm, temperate seagrass meadows of St. Joseph Bay, Florida (USA)." Marine Ecology Progress Series 639 (April 2, 2020): 37–51. http://dx.doi.org/10.3354/meps13285.
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Green turtles Chelonia mydas occur sporadically in tropical and subtropical latitudes, but effective conservation efforts are leading to increasing abundances at higher latitudes. One consequence of increased green turtle abundance in some locations has been the overgrazing of seagrasses, their preferred food item. Recent, large increases in juvenile green turtle abundance in the warm temperate northern Gulf of Mexico, especially in the clear waters of St Joseph Bay, FL, make this a prime location to study effects of their feeding activities on the extensive turtlegrass Thalassia testudinum-dominated meadows. Using caging and simulated grazing to quantify green turtle effects, we found that excluding green turtles led to increased Thalassia shoot density, and that simulating turtle grazing resulted in narrowed leaves and decreased turtlegrass productivity. Naturally grazed areas protected from further turtle grazing did not recover after 14 wk of protection. Two years following relaxation of simulated grazing, turtlegrass continued to show residual stress symptoms, with narrower and fewer leaves per shoot than control areas. The future success of sea turtle conservation efforts is critically linked, and dependent on, the protection and sustainability of globally decreasing sea turtle feeding grounds. Thus, continued study of how increasing green turtle populations affect warm temperate turtlegrass meadows will provide important information on how best to manage both turtle and seagrass resources.
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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, and Suzanne Vardy. "Host–Gut Microbiome Metabolic Interactions in PFAS-Impacted Freshwater Turtles (Emydura macquarii macquarii)." Metabolites 12, no. 8 (August 16, 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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CASALE, P., and G. SIMONE. "Seasonal residency of loggerhead turtles Caretta caretta tracked from the Gulf of Manfredonia, south Adriatic." Mediterranean Marine Science 18, no. 1 (February 3, 2017): 4. http://dx.doi.org/10.12681/mms.1663.
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A detailed knowledge of sea turtle distribution in relation to anthropogenic threats is key to inform conservation measures. We satellite tracked five loggerhead turtles incidentally caught in the Gulf of Manfredonia, where a high turtle occurrence and high bycatch levels have been recently reported. Turtles were tracked for a period ranging from 27 to 367 days, with a minimum travel distance ranging from 151 to 4,300 km. With the caution due to the small sample size, results suggest that: (i) the area may host residential loggerhead turtles at least in summer, while they probably move elsewhere in winter due to the low temperatures occurring in shallow waters, (ii) turtles may have very small home ranges in the area, (iii) turtle occurrence may be higher in shallow waters along the coast. Moreover (iv) one turtle showed remarkable fidelity to the same spot after seasonal migration and constant migration paths. If confirmed and further detailed, such movement patterns may guide effective conservation strategies to reduce the impact of bycatch in the area.
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Sonder, I. Wayan. "Management Of Sindu Dwarawati Sanur Turtle Conservation As A Tourism Attraction In Sanur Tourism Area." Journey : Journal of Tourismpreneurship, Culinary, Hospitality, Convention and Event Management 7, no. 1 (June 27, 2024): 35–48. http://dx.doi.org/10.46837/journey.v7i1.191.
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Sindu Dwarawati Turtle Conservation is one of the turtle conservation in the Sanur tourism area. This conservation was built as a concern of youth groups who were moved to save sea turtles, especially sea turtle eggs around Sanur Beach. This research was conducted to know the process of turtle conservation and its management as a tourist attraction at Sindu Dwarawati Turtle Conservation. Both primary and secondary data were collected by conducting interviews, observation, and documentation. Data sources in the research were determined using purposive sampling and accidental sampling techniques. The data were analyzed using the descriptive qualitative data analysis method. The results showed that Sindu Dwarawati Sanur conservation has succeeded in conserving and saving sea turtles as support for government programs. The management of this turtle conservation as a tourist attraction has fulfilled the elements of something to see, to do, to buy, and to buy and fulfills the A4 criteria (attraction, accessibility, amenity, and ancillary service). However, ancillary services need to be optimized with the establishment of a structured management institution in serving tourists.
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Herrera, Candy, Evelyn Guerra, Andrea Rosas, Yingying Wei, Jack Pringle, Baltazar Espinoza, and Baojun Song. "The Impact of Temperature-Dependent Sex Determination on the Population Dynamics of Green Sea Turtles (Chelonia mydas)." Bionatura 5, no. 1 (February 15, 2020): 1029–38. http://dx.doi.org/10.21931/rb/2020.05.01.4.
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The sex of the turtles is determined by the incubation temperature of the eggs during the mid-trimester of development. In green sea turtles (Chelonia mydas), recent studies show that sex ratios are changing, producing a female-biased sex ratio within the population. We developed a novel continuous model to analyze the dynamics of the green sea turtle population long-term. We determine the safe operating space for the proportion of eggs that become male at which the population of green sea turtle can exist without going to extinction. When the proportion of male eggs leaves this range the overall turtles’ population collapses. Additionally, we examined how temperature changes affect the sex ratios of the green sea turtle population.
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Glorioso, Brad M., Lindy J. Muse, Cory J. Hillard, Brittany R. Maldonado, Jared Streeter, Charles D. Battaglia, and J. Hardin Waddle. "A Trapping Survey Targeting Head-Started Alligator Snapping Turtles in Southwest Louisiana." Journal of Fish and Wildlife Management 11, no. 2 (August 20, 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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Hossain, MA, MI Miah, KR Hasan, JJ Bornali, and M. Shahjahan. "Present status of conservation and management of sea turtle in Coxs Bazar district of Bangladesh." Bangladesh Journal of Animal Science 42, no. 2 (December 31, 2013): 131–38. http://dx.doi.org/10.3329/bjas.v42i2.18493.
Full textAbstract:
The study was conducted to know the present status of conservation and management of sea turtle in Coxs Bazar district. Data were collected by physical survey, interviewing people of the study area and from different non-government and government organizations during December 2010 to November 2011. In the present study, it was found that two species of sea turtles have been making nest in Bangladesh. Major nesting sites of turtles were St. Martin's Island, Teknaf, Bordal, Sonadia Island, Kutubdia Island, Pechardwip, Inani Beach, Moheskhali Island and Shahporirdwip. A total of 260 turtle individuals were found and the highest nesting frequency of Olive ridley (108) and Green turtles (10) were observed in February. About 21,942 hatchlings were produced and released by the hatcheries as a conservational step. Winter season was identified as nesting season for sea turtle. About 45% of the respondents thought that turtles were beneficial while other 40% of the respondents thought turtles were harmful. It was found that the nesting of sea turtles was reducing and there was lack of knowledge among the people of the study area about the importance of sea turtle conservation and management. DOI: http://dx.doi.org/10.3329/bjas.v42i2.18493 Bang. J. Anim. Sci. 2013. 42 (2): 131-138
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Anquetin, Jérémy, Paul M. Barrett, Marc E. H. Jones, Scott Moore-Fay, and Susan E. Evans. "A new stem turtle from the Middle Jurassic of Scotland: new insights into the evolution and palaeoecology of basal turtles." Proceedings of the Royal Society B: Biological Sciences 276, no. 1658 (November 18, 2008): 879–86. http://dx.doi.org/10.1098/rspb.2008.1429.
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The discovery of a new stem turtle from the Middle Jurassic (Bathonian) deposits of the Isle of Skye, Scotland, sheds new light on the early evolutionary history of Testudinata. Eileanchelys waldmani gen. et sp. nov. is known from cranial and postcranial material of several individuals and represents the most complete Middle Jurassic turtle described to date, bridging the morphological gap between basal turtles from the Late Triassic–Early Jurassic and crown-group turtles that diversify during the Late Jurassic. A phylogenetic analysis places the new taxon within the stem group of Testudines (crown-group turtles) and suggests a sister-group relationship between E. waldmani and Heckerochelys romani from the Middle Jurassic of Russia. Moreover, E. waldmani also demonstrates that stem turtles were ecologically diverse, as it may represent the earliest known aquatic turtle.
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Winarto, Winarto, and Siva Devi Azahra. "Karakteristik dan Preferensi Habitat Penyu dalam Membuat Sarang Alami untuk Peneluran." BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains 5, no. 1 (June 22, 2022): 189–96. http://dx.doi.org/10.31539/bioedusains.v5i1.3655.
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This study aims to examine the characteristics and environmental factors of turtles' preferences in making their natural nests. The method used is the descriptive quantitative method. The results showed that there were two types of turtles found during the observation, namely the green turtle (Chelonia mydas) and the hawksbill turtle (Eretmochelys imbricata). Measurements and observations of the characteristics of the 14 nesting points showed that the diameter and depth of the green turtle's nest were larger than those of the hawksbill turtle. Both types of turtles have a preference for nesting areas on sloping beaches with temperatures of 28-30ºC and humidity of 76-89%, as well as being around vegetation in the form of sea pine (Casuarina equisetifolia), sea oyster (Gynura sp), sea pandanus (Pandanus odorifer), sea kangkung (Ipomea peltate) and sea hibiscus (Thespesia populnea). In conclusion, temperature, humidity and types of vegetation around the nest determine the turtle's preference in making natural nests for laying eggs.
Keywords: Nest Characteristics, Conservation, Turtle, Habitat Preference
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Harjiyatni, F. R., J. S. Murdomo, Sri Suwarni, Hartanti, Puji Prikhatna, Retno Lantarsih, and W. H. Putri. "Sea Turtle Protection: A Case Study of Protected Sea Turtle Capture in Gunungkidul Regency, Indonesia." IOP Conference Series: Earth and Environmental Science 1030, no. 1 (June 1, 2022): 012018. http://dx.doi.org/10.1088/1755-1315/1030/1/012018.
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Abstract This paper aims to discuss the legal process for capturing protected turtles in Gunungkidul Regency and the rescued green turtle’s background. This research uses a socio-legal approach. Data were collected using in-depth interviews and observation and analyzed qualitatively. The result shows: first, the process of catching turtles carried out by community members is strictly enforced. The Natural Resources Conservation Agency of Yogyakarta Special Region submitted the turtle arrest case to police investigators for further investigation. Whatever reasons people put forward, it doesn’t stop the police from strictly enforcing the turtle capture case. Second, the background of the capture of green turtles is due to the lack of public awareness and concern about the importance of turtles as endangered species that are protected and should not be caught. In this case, the regulations regarding the protection and prohibition of capturing turtles are complete, but the local communities often violate them. The results suggest a need to strengthen local communities to understand the importance of protecting turtles as endangered species and strict sanctions for turtle capture. It is not only to establish the education community but also to empower the community to provide the initial information to the investigators if it is found the violation of the Act on the turtles protection.
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Axaraliefya, Dylla, Nina Herlina, and Toto Supartono. "STRATEGI PENGEMBANGAN EKOWISATA BERBASIS PENYU HIJAU DI KAWASAN PANTAI SUKAMADE TAMAN NASIONAL MERU BETIRI." Journal of Forestry And Environment 6, no. 1 (June 30, 2023): 46–61. http://dx.doi.org/10.25134/jfe.v6i1.9074.
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The Sukamade Beach area of Meru Betiri National Park is one of the distribution areas for green turtles in Indonesia. The existence of these green turtles has the potential to become an ecotourism attraction. The aim of this research is to determine the potential of green turtles (nesting season and nesting behavior) and to develop green turtle-based ecotourism for Meru Betiri National Park Management. The research method used for data collection is the "simple random sampling" method. Data collection includes data on green turtle potential (nesting season and nesting behavior) and green turtle-based ecotourism development strategies. The research data shows that the potential for green turtle-based ecotourism is data on the number of green turtles that appear on the surface of Sukamade Beach, the number of green turtle eggs, the number of green turtle eggs that hatch into hatchlings, the number of green turtle hatchlings that are released into the sea, the number of green turtles laying eggs and the behavior of green turtles when laying eggs, while the green turtle-based ecotourism development strategy that is appropriate for ecotourism development is the strength-opportunity (S-O) strategy by creating a strategy that uses strengths to take advantage of opportunities in the form of increasing ecotourism objects with the "Green Turtle Enchantment" program for the purposes of education and research. The suggestions in this research are the need to monitor vegetation and the distribution of green turtle nests so that the existence of green turtles will remain sustainable, create an interpretation board regarding information on the existence, benefits and behavior of green turtles, collaborate with the community and village government in management around the Sukamade Beach area so that it does not cause problems. Social reflection and further research on Habitat Specifications for Green Turtles Laying Eggs on Sukamade Beach, Meru Betiri National Park to make it easier for managers to find out the location of green turtles nesting.Kawasan Pantai Sukamade Taman Nasional Meru Betiri merupakan salah satudaerah penyebaran penyu hijau di Indonesia. Keberadaan penyu hijau tersebut sangatberpotensi untuk dijadikan sebagai salah satu objek ekowisata. Tujuan penelitian iniadalah mengetahui potensi penyu hijau (musim bertelur dan perilaku bertelur) danmenyusun engembangan ekowisata berbasis penyu hijau kepada Pengelola Taman Nasional Meru Betiri. Metode penelitian yang digunakan untuk pengumpulan data yaitumenggunakan metode “simple random sampling”. Pengumpulan data meliputi data potensi penyu hijau (musim bertelur dan perilaku bertelur) dan strategi pengembangan ekowisata berbasis penyu hijau. Data hasil penelitian menunjukkan bahwa potensi ekowisata berbasis penyu hijau adalah data jumlah keberadaan penyu hijau yang muncul di permukaan Pantai Sukamade, jumlah telur penyu hijau, jumlah telur penyu hijau yang menetas menjadi tukik, jumlah tukik penyu hijau yang di lepas ke laut, jumlah penyu hijau yang bertelur dan perilaku penyu hijau saat bertelur sedangkan strategi pengembangan ekowisata berbasis penyu hijau yang tepat untuk pengembangan ekowisata yaitu strategi kekuatan-peluang (S-O) dengan menciptakan strategi yang menggunakan kekuatan untuk memanfaatkan peluang berupa peningkatan objek ekowisata dengan program “Pesona Penyu Hijau” untuk keperluan pendidikan dan penelitian. Saran dalam penelitian ini adalah perlunya monitoring vegetasi dan penyebaran sarang penyu hijau sehingga keberadaan penyu hijau akan tetap lestari, pembuatan papan interpretasi mengenai informasi keberadaan, manfaat dan perilaku penyu hijau, kerjasama dengan masyarakat dan pemerintah desa dalam pengelolaan di sekitar Kawasan Pantai Sukamade sehingga tidak menimbulkan kecemburuan sosial dan penelitian lanjutan tentang Spesifikasi Habitat Penyu Hijau Bertelur di Pantai Sukamade Taman Nasional Meru Betiri agar dapat mempermudah pengelola untuk mengetahui lokasi peneluran penyu hijau
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Utami, Dhita Hardiyanti, and Tri Prasetyo Aji. "Turtle Conservation and Education Center (TCEC) as a Corporate Social Responsibility Program in Serangan Village." Prospect: Jurnal Pemberdayaan Masyarakat 2, no. 3 (August 28, 2023): 163–71. http://dx.doi.org/10.55381/jpm.v2i3.179.
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One of PT Pertamina Patra Niaga Fuel Terminal Sanggaran Corporate Social Responsibility (CSR) activities, community-based turtle conservation is a response to phenomena that occur in its operational Ring I area. It is also sometimes referred to as the Turtle Conservation and Education Center. A community-based conservation initiative was established on Serangan Island in response to the illegal and endangering use of sea turtles. The goal of this study is to learn how the TCEC program is being implemented on Serangan Island in an effort to protect sea turtles. The qualitative data-gathering procedures used in this research method include documentation, literature reviews, and interviews. The research results showed that TCEC is believed to be capable of preserving the turtle population on Serangan Island through efforts to save turtles and relocate nests, perform surgical procedures on turtles, rehabilitate turtles, release hatchlings, and educate and socialize turtles for visitors. The conservation program at TCEC has both direct and indirect effects on society, the economy, and the environment. In addition to advancing inclusive and sustainable economic growth, productive and comprehensive job opportunities, and decent work for the residents of Serangan Traditional Village, the Turtle Conservation and Education Center (TCEC) additionally contributes to goal 15 of the Land Ecosystem by preserving three species of endangered turtles and enhancing their numbers.