Relevant bibliographies by topics / Turtle populations

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Academic literature on the topic 'Turtle populations'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2024

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Journal articles on the topic "Turtle populations"

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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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Wijewardena, Tharusha, Matthew G. Keevil, Nicholas E. Mandrak, Andrew M. Lentini, and Jacqueline D. Litzgus. "Evaluation of headstarting as a conservation tool to recover Blanding’s Turtles (Emydoidea blandingii) in a highly fragmented urban landscape." PLOS ONE 18, no. 3 (March 8, 2023): e0279833. http://dx.doi.org/10.1371/journal.pone.0279833.

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Freshwater turtle populations are declining globally as a result of anthropogenic activities. Threats to turtles in urban areas are exacerbated by road mortality and subsidized predators, which can lead to catastrophic shifts in population size and structure. Headstarting is used as a conservation tool to supplement turtle populations that may otherwise face extirpation. A headstarting program began in 2012 to recover a functionally extinct population of Blanding’s Turtles (Emydoidea blandingii) 26in Rouge National Urban Park (RNUP), Ontario, Canada. The original population included five adults and one juvenile turtle. From 2014 to 2020, 270 headstarted turtles were released. The population has been monitored annually since 2014 using visual-encounter surveys, radio-telemetry, and live trapping (from 2018 onwards). We used mark-recapture and radio-telemetry data to quantify abundance, survival, and sex ratio of the headstarted turtle population. Using a Jolly-Seber model, we estimated abundance to be 183 turtles (20 turtles/ha) in 2020. Estimated survival of headstarted turtles approached 89%, except for turtles released in 2019 when survival was 43% as a result of a known mass mortality event at the study site. Pre- and post-release sex ratios were not significantly different (χ2 = 1.92; p = 0.16), but shifted from 1:1.5 to 1:1 male:female post-release. Given that the headstarted turtles have not yet reached sexual maturity, it is unclear whether headstarted turtles will reach adulthood and successfully reproduce to maintain a self-sustaining population. Thus, to evaluate the success of the headstarting program, long-term monitoring is required.
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Ahmed, Khalid, Benjamin Tapley, and Christopher J. Michaels. "Global and regional patterns in distribution and threat status of zoo collections of turtles and tortoises." Herpetological Journal 34, no. 1 (January 1, 2024): 1–10. http://dx.doi.org/10.33256/34.1.110.

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Turtles are a globally threatened group of reptiles. Zoo populations may contribute to the conservation of species, including turtles, but collection composition may not align with conservation needs. We combined data from the Zoological Information Management System (ZIMS), EDGE of Existence, the IUCN Red List and the Reptile Database to investigate zoo turtle holdings on global and regional scales. Globally, zoo collections were representative of turtle diversity, regional species distributions and threat statuses, indicating no bias towards threatened species and no taxonomic or distribution blind spots. Species kept in zoos had significantly lower EDGE scores than those not represented, and threatened species were no more likely to have been bred in the year prior to data collection (before March 2022) or have non-viable populations, but were more likely to have a larger population size. Although Africa, Asia and South America have the smallest turtle holdings in terms of species, allowing for regional capacity, these regions hold more, while Europe holds fewer than expected turtle species – North American and Asian holdings do not differ from expected. African, Asian, North and South American regions significantly bias their collections towards native species. We found evidence for significant increases in turtle populations at the genus level following the EAZA Shellshock campaign in Europe. ZIMS data are limited by taxonomy, membership and accuracy of records but provide the best window into patterns of zoo turtle collections. While holding a species in a zoo does not equate to conservation value, based on these data, we recommend that conservation prioritisation exercises are developed for all turtle species, holding institutions or regional taxonomic advisory address population viability and support for institutions working with significant turtle populations in captivity to join ZIMS is provided. Keywords: chelonia, ex-situ, zoos, conservation, ZIMS
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Johnston, Gerald R., Joseph C. Mitchell, Eric Suarez, Tom Morris, Georgia A. Shemitz, Peter L. Butt, and Robert L. Knight. "The Santa Fe River in northern Florida: effect of habitat heterogeneity on turtle populations." Bulletin of the Florida Museum of Natural History 54, no. 5 (December 7, 2016): 69–103. http://dx.doi.org/10.58782/flmnh.xcex4207.

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The Santa Fe River (SFR) in northern Florida and its springs provide a unique ecosystem for a wealth of flora and fauna, and support a unique freshwater turtle assemblage. We conducted a 6-year mark-recapture study of ten turtle species to assess how habitat heterogeneity among sites affects riverine turtle populations. Because the SFR ecosystem has not been well described and the major emphasis of this paper is the effect of habitat variation on turtle populations, we provide thorough descriptions of the SFR basin and specific habitats in which we sampled turtles. The SFR originates as a tannin-stained blackwater river, but receives substantial input of clear, alkaline, thermally stable water from numerous artesian springs in its lower reaches. We used mark-recapture and demographic data to evaluate differences in turtle assemblages and population structure on a spatial scale. We compared turtle assemblages between a 5 km reach of blackwater river habitat and a 9 km reach of spring-influenced river habitat. We found the same ten species in both habitats. Hand capture while snorkeling suggested similar relative abundance of species in both river habitats, but baited hoop trap captures suggested that Chelydra serpentina (Snapping Turtle) and Sternotherus minor (Loggerhead Musk Turtle) are proportionately more abundant in the three spring-influenced habitats we sampled. The total density of all turtle species combined appears to be three to four times greater in the spring-influenced river reach than in the blackwater river reach. Examination of population structure of the three most abundant species (Pseudemys suwanniensis [Suwannee Cooter], S. minor, and Trachemys scripta [Yellow-bellied Slider]) in the river and adjacent spring habitats revealed that some springs feeding the SFR may function as nursery habitats. Results demonstrate the importance of habitat diversity (beta diversity) to the riverine turtle assemblage. If we had sampled turtles only in one section of the river or only in spring habitats in the lower SFR, our perceptions of assemblages and population structure would have been vastly different. The fate of the turtle populations in the SFR depends on the quantity and quality of water discharging from its springs. If the long-term trend of declining spring flows continues, we predict that SFR turtle populations will be detrimentally affected in multiple ways such as loss of nursery habitat and reduced recruitment. Less dilution of dark tannic water flowing down from the upper SFR may cause shifts in assemblage and population structure, as well as in population densities. Given the uncertain future of ecological conditions in the SFR, we advocate continued long-term monitoring of this unique turtle assemblage.
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Hendrix, Haley, and Sílvia Pérez-Espona. "A Systematic Review of Population Monitoring Studies of Sea Turtles and Its Application to Conservation." Diversity 16, no. 3 (March 12, 2024): 177. http://dx.doi.org/10.3390/d16030177.

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Sea turtles are keystone species in marine environments due to their essential role as seagrass grazers and population regulation of jellyfish and sponges in coral reefs. However, due to their predominant presence in coastal areas, sea turtle populations face significant threats due to the impact of human activities. In this systematic review, 655 peer-reviewed publications were analyzed to assess the extent of population monitoring for all seven sea turtle species. The analyses revealed that, although population monitoring studies have increased for sea turtles in the past four decades, these have been biased towards certain species and oceanic regions. Furthermore, sea turtle population monitoring has been undertaken primarily using field-based methods, with satellite tracking and nest surveys being the most commonly used methods; however, the implementation of genetic methods for population monitoring has increased since the 2000s. Direct conservation recommendations from this study include the urgent need to establish population monitoring studies in the Critically Endangered Kemp’s ridley and hawksbill and the Data Deficient flatback. Furthermore, population monitoring programs should be implemented in Southeast Asia and Northern and Central Africa, where knowledge on sea turtle populations is still limited. Finally, due to the long-distance movements of sea turtles, we also advocate for international cooperation and collaboration of local communities to protect these ecologically important and iconic marine species.
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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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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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Butynski, Thomas M. "Marine turtles on Bioko Island, Equatorial Guinea." Oryx 30, no. 2 (April 1996): 143–49. http://dx.doi.org/10.1017/s0030605300021529.

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Four endangered species of marine turtle nest on the southern beaches of Bioko Island, Equatorial Guinea. The turtles and their eggs are an important traditional source of food for the people of the area and turtle populations have apparently declined considerably, probably because of overexploitation. This paper reviews what is known about Bioko's marine turtles, their nesting seasons, population trends, use by humans, conservation status and recent conservation efforts. Recommendations are made for additional research and conservation action.
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Whiting, Andrea U., Allan Thomson, Milani Chaloupka, and Colin J. Limpus. "Seasonality, abundance and breeding biology of one of the largest populations of nesting flatback turtles, Natator depressus: Cape Domett, Western Australia." Australian Journal of Zoology 56, no. 5 (2008): 297. http://dx.doi.org/10.1071/zo08038.

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Cape Domett, located in tropical Western Australia, supports a significant population of flatback turtles, Natator depressus, but the magnitude of this was previously underestimated. We assessed temporal nesting abundance to find that Cape Domett supports one of the largest aggregated nesting flatback turtle populations globally with annual abundance in the order of several thousand individuals (estimated = 3250, 95% CI = 1431–7757). We assessed temporal abundance within a year to find turtles nested throughout the year with peak nesting occurring between August and September. This paper re-evaluates the importance of this major flatback turtle nesting site and shows the first detailed examination of flatback turtle nesting biology in north-western Australia.
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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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Dissertations / Theses on the topic "Turtle populations"

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Beaudry, Frédéric. "Road Mortality Risk for Spotted and Blanding's Turtle Populations." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/BeaudryF2007.pdf.

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Saumure, Raymond A. "Growth, mutilation, and age structure of two populations of wood turtles, Clemmys insculpta, in southern Québec." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29779.pdf.

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Marx, Melanie [Verfasser]. "Population connectivity of European Turtle Doves (Streptopelia turtur) : threats affecting European populations and modelling of species-habitat relationships at German breeding grounds / Melanie Marx." Gießen : Universitätsbibliothek, 2019. http://d-nb.info/1180979249/34.

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Wright, Lucy Isabel. "Insights into the mating systems of green turtle populations from molecular parentage analyses." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3695.

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Gaining a good understanding of marine turtle mating systems is fundamental for their effective conservation, yet there are distinct gaps in our knowledge of their breeding ecology and life history, owing largely to the difficulty in observing these highly mobile animals at sea. Whilst multiple mating by females, or polyandry, has been documented in all marine turtle species, the fitness consequences of this behaviour have not been fully investigated. Furthermore, male mating patterns, operational sex ratios and the number of males contributing to breeding populations are poorly understood, impeding accurate assessments of population viability. In this thesis, I use molecular-based parentage analysis to study, in detail, the genetic mating system of two green turtle (Chelonia mydas) populations. In the focal population in northern Cyprus, I show that, despite exhibiting a strongly female-biased hatchling sex ratio and contrary to our expectations, there are at least 1.3 breeding males to every nesting female. I go on to assess the breeding frequency of male turtles in the population and determine that males do not breed annually at this site, demonstrating that the observed relatively equal sex ratio of breeders is not the result of a few males mating every year, but that the number of breeding males in the population is greater than expected. I show that 24% of nesting females in the population produce clutches with multiple paternity, but do not detect any fitness benefits to polyandrous females, and discuss the potential role of sexual conflict in influencing female mating decisions. Finally, I reveal a high frequency of multiple paternity in green turtle clutches on Ascension Island, one of the largest green turtle rookeries in the world, and discuss possible causes of variation in the level of polyandry among marine turtle populations. The results presented here shed new light on aspects of marine turtle mating systems that are challenging to study, and illustrate the value of molecular data, not only in describing mating patterns, but in elucidating aspects of life history and behaviour that would otherwise be very difficult to ascertain.
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Trembath, Dane F., and n/a. "The comparative ecology of Krefft's River Turtle Eydura krefftii in Tropical North Queensland." University of Canberra. Resource, Environmental & Heritage Sciences, 2005. http://erl.canberra.edu.au./public/adt-AUC20060711.113815.

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An ecological study was undertaken on four populations of Krefft�s River Turtle Emydura krefftii inhabiting the Townsville Area of Tropical North Queensland. Two sites were located in the Ross River, which runs through the urban areas of Townsville, and two sites were in rural areas at Alligator Creek and Stuart Creek (known as the Townsville Creeks). Earlier studies of the populations in Ross River had determined that the turtles existed at an exceptionally high density, that is, they were superabundant, and so the Townsville Creek sites were chosen as low abundance sites for comparison. The first aim of this study was to determine if there had been any demographic consequences caused by the abundance of turtle populations of the Ross River. Secondly, the project aimed to determine if the impoundments in the Ross River had affected the freshwater turtle fauna. Specifically this study aimed to determine if there were any difference between the growth, size at maturity, sexual dimorphism, size distribution, and diet of Emydura krefftii inhabiting two very different populations. A mark-recapture program estimated the turtle population sizes at between 490 and 5350 turtles per hectare. Most populations exhibited a predominant female sex-bias over the sampling period. Growth rates were rapid in juveniles but slowed once sexual maturity was attained; in males, growth basically stopped at maturity, but in females, growth continued post-maturity, although at a slower rate. Sexual maturity was at 6-7 years of age for males, which corresponded to a carapace length of 150-160 mm, and 8-10 years of age for females, which corresponded to a carapace length of 185-240 mm. The turtles were omnivorous, although in the Ross River they ate more submerged vegetation (by percent amount and occurrence) than those of the Townsville Creeks. Turtles in Townsville Creeks ingested more windfall fruit and terrestrial insects.
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Trocini, Sabrina. "Health assessment and hatching success of two Western Australian loggerhead turtle (Caretta caretta) populations." Thesis, Trocini, Sabrina (2013) Health assessment and hatching success of two Western Australian loggerhead turtle (Caretta caretta) populations. PhD thesis, Murdoch University, 2013. https://researchrepository.murdoch.edu.au/id/eprint/18114/.

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Most of the existing sea turtle populations worldwide are in decline, and loggerhead turtles (Caretta caretta), in particular, are listed as Endangered. The loggerhead nesting population in Western Australia is the largest nesting population in Australia and one of the largest in the Indian Ocean and the world. This research project investigated hatching success and health, two critical aspects for loggerhead turtle conservation and management, on two important nesting sites in Western Australia: Turtle Bay on Dirk Hartog Island and Bungelup Beach in Cape Range National Park. This project undertook an inter-disciplinary approach encompassing the disciplines of conservation medicine, ecology and epidemiology to investigate questions about sea turtle conservation that could not be addressed by any of these disciplines alone. Morphological and reproductive measurements were collected during two nesting seasons, between 2006 and 2008, obtaining important baseline reproductive data about the Western Australian population. It was found that the presence of deformed and yolkless eggs was associated with smaller clutch size. At the same time several biotic and abiotic factors were assessed in relation to embryonic and hatchling mortality. Hatching success was significantly reduced by high temperatures during the pre-emergent period, the presence of roots in the nest and nest location along the beach. Results suggest that bacterial contamination of sand on the high nesting density beach sectors may, in part, be responsible for the differences in hatching success along the beach. High nest temperature during the pre-emergent period also significantly reduced emergence success and influenced emergence patterns and duration. Prolonged emergence duration, associated with increased nest temperatures, may further reduce hatchling survival due to diminished energy reserves and increased risk of predation. On the mainland nesting site, Bungelup Beach, predation of eggs and hatchlings severely limited reproductive success with over 80% of the monitored nests showing signs of partial or complete predation. In contrast with that reported in the literature, ghost crabs (Ocypode spp) were the main predator at this site and the first among the identified predators to dig into nests. Perentie (Varanus giganteus) and introduced foxes (Vulpes vulpes) also predated on eggs and hatchlings, making the level of predation recorded unlikely to be sustainable in the long term. Health monitoring of the nesting populations enabled the determination of baseline blood health parameters and toxin levels in blood. Two cases of fibropapillomatosis were confirmed for the first time in Western Australian loggerhead turtles. Changes in the leukogram and some biochemical parameters were detected in association with the presence of barnacles, in particular burrowing barnacles. In order to establish the connection between the nesting turtles’ health and reproductive success, maternal health indices were compared to hatching success and reproductive output. Several blood health parameters, including alpha and gamma proteins, iron, zinc and vitamin E levels, were correlated with hatching success or clutch size, suggesting that these parameters influence reproduction in loggerhead turtles. Additionally, sea turtles with reproductive abnormalities, such as soft-shelled or deformed eggs, had higher blood mercury levels than turtles without any egg or clutch abnormalities. This finding raises important questions about the toxic effect of mercury, at low blood concentrations, on sea turtle reproduction. During the health assessment, a novel intraerythrocytic protozoal parasite species, similar to a malaria parasite (Haemoproteus and Plasmodium spp), was identified for the first time in sea turtles and was described through the use of light microscopy and diagnostic molecular techniques. The phylogenetic analysis indicated that this new parasite is closely related to other haemosporidia isolated from chelonians, but is well separated from malaria parasites isolated from other hosts (e.g. mammals, birds and other reptiles). This parasite appears to be largely benign. Although parasitaemia was low in all infected individuals, further studies are required to assess the potential impact of this haemoparasite on sea turtle fitness. In conclusion, this study provided further understanding of factors affecting reproductive success, identified threats to the Western Australian nesting population whilst at the same time enabling assessment of the general health of nesting loggerhead turtles in Western Australia.
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Hatase, Hideo. "Studies on migration, dynamics, and genetic variation in Japanese loggerhead turtle (Caretta caretta) nesting populations." Kyoto University, 2002. http://hdl.handle.net/2433/149503.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(農学)
甲第9778号
農博第1290号
新制||農||852(附属図書館)
学位論文||H14||N3709(農学部図書室)
UT51-2002-M156
京都大学大学院農学研究科応用生物科学専攻
(主査)教授 坂本 亘, 教授 田中 克, 教授 林 勇夫
学位規則第4条第1項該当
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Belleau, Pascale. "Habitat selection, movement patterns, and demography of common musk turtles (Sternotherus odoratus) in southwestern Québec." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112379.

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I studied the common musk turtle (Sternotherus odoratus) at the northern limit of its range at Norway Bay, Quebec, from April to October 2006. Common musk turtles are habitat specialists and are selective of their habitats at the study-area and home-range scales. Beaver ( Castor canadensis) lodges were preferred at the study-area scale. Common musk turtles also preferred beaver lodges, emergent wetlands, aquatic beds with floating and submerged vegetation as well as rocky shores at the home-range scale. At the location scale, common musk turtles chose shallower and cooler sites that contained more logs and submerged vegetation than the sites available at random. There was no significant effect of sex on habitat use at the location scale. There was no significant difference in mean daily movements between the sexes during the active season. However, sex and month probably interact together to influence the mean distance traveled daily by common musk turtles in Norway Bay. Males appeared to move more than females in May, July, and October. Females appeared to move more daily than males in August and September. Neither sex appeared to move more daily in June. However, our small sample size did not allow us to conduct a conclusive analysis. The mean home-range area was 23.9 ha and was not different between sexes. I estimated a density of 4.1 turtles/ha and a sex ratio of 1.7M: 1F. The population includes 59.6% males, 35.8% females, and 4.6% juveniles. Adults ranged from 77 mm to 133 mm in carapace length.
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Salvarani, Patricia Ishisaki. "Impact of contaminants in natural populations of marine turtles (Campeche, Mexico)." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23764.

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Doutoramento em Biologia
As tartarugas marinhas sofrem um forte impacto populacional devido às atividades antropogênicas, como as causadas pelo aumento da exploração comercial e industrial nas áreas costeiras, alteração do habitat, ingestão de resíduos sólidos, captura acidental nas atividades pesqueiras e a contaminação de poluentes químicos. Das sete espécies de tartarugas marinhas existentes distribuídas por quase todos os oceanos (Caretta caretta, Chelonia mydas, Dermochelys coriacea, Eretmochelys imbricata, Lepidochelys olivacea, Natator depressus e Lepidochelys kempii), exceto o Natator depressus, todos os outros seis são listados como vulneráveis, em perigo ou criticamente ameaçado na lista da IUCN. Os contaminantes ambientais de origem química, como metais pesados, pesticidas, hidrocarbonetos, PCB, organoclorados e dioxinas estão causando um forte impacto na saúde de animais marinhos, incluindo tartarugas marinhas, e a bioacumulação desses poluentes em tecidos e órgãos influenciam o crescimento e desenvolvimento de populações naturais de tartarugas marinhas em todo o mundo, podendo causar mortalidade em vários estágios de seu desenvolvimento. Uma vez que estão em perigo é extremamente importante para a compreensão das respostas às medidas de impacto e conservação à longo prazo nas populações de tartarugas marinhas. Este trabalho é uma visão geral dos estudos sobre a quantificação de contaminantes em ovos e sangue de tartarugas marinhas, buscando relações entre o tamanho da carapaça e a atividade de enzimas antioxidantes usando técnicas não-letais. A concentração de pesticidas organoclorados (OCPs) no plasma das fêmeas adultas e os ovos das tartarugas de pente (Eretmochelys imbricata) e tartaruga verde (Chelonia mydas) que desovam na área costeira de Campeche serão analisados. O objetivo principal desta tese é avaliar o potencial das populações naturais como bioindicadores de contaminação química. Para tal, foram analisados os valores hematológicos, contaminação de OCPs no plasma e ovos de duas espécies de tartarugas marinhas com hábitos alimentares diferentes e uma possível transferência materna na espécie de tartaruga de pente. Por fim, a atividade de biomarcadores enzimáticos foram correlacionadas com a contaminação por OCPs. Os resultados mostraram que foram encontrados OCPs em todos os ovos analisados, mostrando maiores concentrações de ΣHCH e ΣDrines nas duas espécies selecionadas, sendo encontradas diferenças significativas entre as espécies e os anos analisados. Foram encontras diferenças significativas entre as concentrações de OCPs (ΣHCHs, ΣDrines e ΣChlordanes) em relação ao sangue e ovos, indicaram que esses contaminantes químicos estão sendo transferidos maternalmente. Nenhuma enzima antioxidante teve relação significativa com os OCPs mais encontrados no sangue (ΣDDTs, ΣHCHs e ΣDrines).
Sea turtles have been suffering strong population impact due to anthropogenic activities, such as those caused by the increase in commercial and industrial exploitation of coastal areas, habitat alteration, ingestion of solid waste, incidental capture in fishing activities and contamination of chemical pollutants. Of the seven species of marine turtles existing distributed by almost all oceans (Caretta caretta, Chelonia mydas, Dermochelys coriacea, Eretmochelys imbricata, Lepidochelys olivacea, Natator depressus and Lepidochelys kempii), except the Natator depressus, all other six are listed as vulnerable, endangered or critically endangered on the IUCN list. Environmental contaminants of chemical origin such as heavy metals, pesticides, hydrocarbons, PCBs, organochlorine, and dioxins are causing major health impacts of marine animals, including sea turtles, and bioaccumulation of these pollutants in tissues and organs influence the growth and development of natural populations of sea turtles worldwide, may cause mortality in various stages of development. Because they are endangered is extremely important to the understanding of responses to impact and conservation measures in the long term in the populations of sea turtles in developing. This work is an overview of studies on the quantification of contaminants in blood and sea turtle eggs, searching for relationships between, carapace size and the activity of antioxidant enzymes using non-lethal techniques. The concentration of organochlorine pesticides (OCPs) in plasma of adult females and eggs of hawksbill turtles (Eretmochelys imbricata) and green turtle (Chelonia mydas) that nest in the coastal area of Campeche will be analysed. The main objective of this thesis is to evaluate the potential of natural populations as bioindicators of chemical contamination. For this, the hematological values, contamination of OCPs in the plasma and eggs of two species of sea turtles with different feeding habits and a possible maternal transfer in the hawksbill turtles were analysed. Finally, the activity of enzymatic biomarkers was correlated with the contamination by OCPs. The results showed that OCPs were found in all analysed eggs, showing higher concentrations of ΣHCH and ΣDrines in the two species selected, being found significant differences between the species and the studied years. We find significant differences between the concentrations of OCPs (ΣHCHs, ΣDrines and ΣChlordanes) of blood to eggs showed that these chemical contaminants being transferred maternally. No antioxidant enzyme had significant relationship with COPs main found in the blood (ΣDDTs, ΣHCHs and ΣDrines).
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Hagood, Susan. "Genetic differentiation of selected Eastern box turtle (Terrapene carolina) populations in fragmented habitats, and a comparison of road-based mortality rates to population size." College Park, Md. : University of Maryland, 2009. http://hdl.handle.net/1903/9995.

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Thesis (Ph.D.) -- University of Maryland, College Park, 2009.
Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Books on the topic "Turtle populations"

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Ahamada, Said. Estimation of nesting marine turtles and programme for their conservation in Moheli Islands, Comores. Zanzibar]: Western Indian Ocean Marine Science Association, 2001.

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Daigle, Claude. Inventaires de la tortue des bois au Québec: Rapport d'étape, années 1994 et 1995. Québec: Ministère de l'environnement et de la faune, Direction de la faune et des habitats, Service de la faune terrestre, 1996.

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Maisonneuve, Charles. Inventaires aériens de sauvagine dans les bassins versants des rivières Boyer et Le Bras, 1992-1995. Québec: Ministère de l'environnement et de la faune, 1998.

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Southeast Fisheries Science Center (U.S.), ed. An assessment of the Kemp's Ridley (Lepidochelys kempii) and loggerhead (Caretta caretta) sea turtle populations in the western North Atlantic. Miami, FL: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southeast Fisheries Science Center, 1998.

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Pacific Sea Turtle Recovery Team (U.S.), United States. National Marine Fisheries Service., and U.S. Fish and Wildlife Service. Region 1., eds. Recovery plan for U.S. Pacific populations of the East Pacific green turtle (Chelonia mydas). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1998.

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Groombridge, Brian. The green turtle and hawksbill (Reptilia: Cheloniidae): World status, exploitation and trade. Lausanne, Switzerland: Secretariat of the Convention on International Trade in Endangered Species of Wild Fauna and Flora, 1989.

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Pacific Sea Turtle Recovery Team (U.S.), United States. National Marine Fisheries Service, and U.S. Fish and Wildlife Service. Region 1, eds. Recovery plan for U.S. Pacific populations of the hawksbill turtle (Eretmochelys imbricata). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1998.

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Pacific Sea Turtle Recovery Team (U.S.), United States. National Marine Fisheries Service, and U.S. Fish and Wildlife Service. Region 1, eds. Recovery plan for U.S. Pacific populations of the loggerhead turtle (Caretta caretta). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1998.

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Pacific Sea Turtle Recovery Team (U.S.), United States. National Marine Fisheries Service, and U.S. Fish and Wildlife Service. Region 1, eds. Recovery plan for U.S. Pacific populations of the green turtle (Chelonia mydas). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1998.

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Pacific Sea Turtle Recovery Team (U.S.), United States. National Marine Fisheries Service., and U.S. Fish and Wildlife Service. Region 1., eds. Recovery plan for U.S. Pacific populations of the hawksbill turtle (Eretmochelys imbricata). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1998.

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Book chapters on the topic "Turtle populations"

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Yaghmour, Fadi, Johannes Els, Clara Jimena Rodríguez-Zarate, and Brendan Whittington-Jones. "Marine Reptiles of the United Arab Emirates." In A Natural History of the Emirates, 585–619. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37397-8_19.

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AbstractWithin the waters of the United Arab Emirates (UAE), there are nine sea snake species and five species of sea turtles, two of which (Hawksbill and Green Sea Turtles) are breeding and forage residents and the remainder migrate to feed through UAE waters. Not only are the waters of the UAE recognized as important habitats for Hawksbill and Green Sea Turtles, but sea turtles are ambassador species for ocean conservation and recognized as a priority species by policy makers and conservationists alike. As a result, despite their numerous challenges, Hawksbill and Green turtle populations in the country are relatively stable. On the other hand, Loggerhead and Olive Ridley Sea Turtles, along with sea snakes enjoy far less interest and attention and so their threats, ecology and population status remain ambiguous. The known challenges facing marine reptiles in the UAE include, but are not limited to, habitat destruction through coastal development, marine pollution, bycatch and climate change.
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Salvarani, Patricia, Vania C. Foster, Jaime Rendon, and Fernando Morgado. "Contaminants Impact on Marine Turtle Populations Development." In Ecotoxicology of Marine Organisms, 205–34. Boca Raton : CRC Press, Taylor & Francis Group, [2019] | “A science publishers book.»: CRC Press, 2019. http://dx.doi.org/10.1201/b22000-9.

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Ferreira-Airaud, Betania, Vanessa Schmitt, Sara Vieira, Manuel Jorge de Carvalho do Rio, Elisio Neto, and Jaconias Pereira. "The Sea Turtles of São Tomé and Príncipe: Diversity, Distribution, and Conservation Status." In Biodiversity of the Gulf of Guinea Oceanic Islands, 535–53. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06153-0_20.

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AbstractThe unique islands of São Tomé and Príncipe harbor five of the seven existent sea turtle species, and offer optimal conditions for these threatened species both on the beaches and on the foraging sites at sea. These populations might have been exploited since the sixteenth century and are still being harvested. In the past decade, our knowledge of these populations has greatly improved, highlighting their regional and global importance. Several conservation initiatives have also prioritized their protection. This chapter reviews our knowledge on the diversity, distribution, and conservation status of sea turtles in São Tomé and Príncipe, providing a brief history of conservation actions from the past 20 years and presenting ongoing research and conservation initiatives.
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Limpus, Colin, and Neville Nicholls. "ENSO Regulation of Indo-Pacific Green Turtle Populations." In Applications of Seasonal Climate Forecasting in Agricultural and Natural Ecosystems, 399–408. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9351-9_24.

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Smith, Caitlin E., Ben L. Gilby, Juan Pablo Muñoz Pérez, Jason P. van de Merwe, and Kathy A. Townsend. "Establishing Standardized Health Baselines for Green Turtle Populations." In Island Ecosystems, 357–71. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28089-4_23.

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Maneja, Rommel H., Jeffrey D. Miller, Ace V. B. Flandez, Jinoy V. Gopalan, Yasir Y. Asiri, Muaadh A. Alnuwairah, and Diego F. Lozano-Cortés. "Natural history and biometrics of sea turtle populations nesting in the Saudi Arabian waters of the Arabian Gulf." In Coral Reefs and Associated Marine Fauna around the Arabian Peninsula, 307–22. London: CRC Press, 2024. http://dx.doi.org/10.1201/9781003321392-27.

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Al-Mansoori, Noura, and Himansu Sekhar Das. "Seagrasses of the United Arab Emirates." In A Natural History of the Emirates, 267–85. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37397-8_9.

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AbstractThe Arabian Gulf’s coastal and marine ecosystems are being negatively impacted by various factors such as population growth, coastal development, industrial and desalination plant discharge, and offshore oil and gas activities. However, seagrass meadows continue to show resilience and provide ecosystem values and services. This paper provides an overview of the seagrass meadows in the United Arab Emirates (UAE) in terms of their extent, species composition, threats, and conservation initiatives. The UAE’s coastline supports three seagrass species that are home to numerous marine species such as dugongs, green sea turtles, fish, and benthic invertebrates. With an area of around 2950 km2, subtidal seagrasses grow to a depth of 16 m and are one of the largest marine ecosystems in the Emirates. Seagrass beds also contribute significantly to blue carbon, with Abu Dhabi seagrasses estimated to have over 52 tonnes per hectare. The primary threats to seagrass meadows include dredging, landfill, and associated sedimentation, as well as environmental extremes such as high summer sea temperatures. However, conservation initiatives such as marine protected areas (MPAs) and federal laws have been implemented to protect these crucial coastal ecosystems.
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Loulida, Soumia, Mohammed Znari, Mohamed Naimi, and Safaa Bendami. "Population Structure and Body Size of the Sahara Blue-Eyed Pond Turtle Mauremys leprosa saharica, from an Isolated Pond in Southern Morocco." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (2nd Edition), 1033–38. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-51210-1_162.

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Pilliod, David S., and Todd C. Esque. "Amphibians and Reptiles." In Rangeland Wildlife Ecology and Conservation, 861–95. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34037-6_25.

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AbstractAmphibians and reptiles are a diverse group of ectothermic vertebrates that occupy a variety of habitats in rangelands of North America, from wetlands to the driest deserts. These two classes of vertebrates are often referred to as herpetofauna and are studied under the field of herpetology. In U.S. rangelands, there are approximately 66 species of frogs and toads, 58 salamanders, 98 lizards, 111 snakes, and 27 turtles and tortoises. Herpetofauna tend to be poorly studied compared with other vertebrates, which creates a challenge for biologists and landowners who are trying to manage rangeland activities for this diverse group of animals and their habitats. Degradation of habitats from human land use and alteration of natural processes, like wildfire, are primary threats to herpetofauna populations. Disease, non-native predators, collection for the pet trade, and persecution are also conservation concerns for some species. Properly managed livestock grazing is generally compatible with herpetofauna conservation, and private and public rangelands provide crucial habitat for many species. Climate change also poses a threat to herpetofauna, but we have an incomplete understanding of the potential effects on species. Dispersal and adaptation could provide some capacity for species to persist on rangelands as climates, disturbance regimes, and habitats change. However, inadequate information and considerable uncertainty will make climate mitigation planning difficult for the foreseeable future. Planning for and mitigating effects of climate change, and interactions with other stressors, is an urgent area for research. Maintaining large, heterogeneous land areas as rangelands will certainly be an important part of the conservation strategy for herpetofauna in North America.
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Innis, Charles, and Kara Dodge. "A veterinary perspective on the conservation physiology and rehabilitation of sea turtles." In Conservation Physiology, 241–54. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198843610.003.0014.

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Sea turtle populations are threatened globally due to anthropogenic and natural factors, including fisheries interactions, watercraft strike, hunting, habitat loss, pollution, climate change, and severe weather. Injured and ill sea turtles are often evaluated by wildlife rehabilitation centres, and many sea turtles can be returned to the wild after rehabilitation. Physiological evaluation of injured and ill sea turtles has revealed life-threatening physiological dysfunction such as acidosis, hypoxia, hypercarbia, dehydration, and hyperkalaemia. Recognition and management of such conditions has improved the outcome for these patients. In addition to clinical advancement, veterinary evaluation has improved our understanding of general sea turtle biology, and increased the safety of procedures such as anaesthesia and laparoscopy. These modalities, combined with emerging biotelemetry technologies, will continue to improve our understanding of sea turtle ecology and conservation physiology.
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Conference papers on the topic "Turtle populations"

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Kelly, Bethany, Kenny Nguyen, Zach Miles, Salvador Mayoral, Susan Piacenza, Cheng Zhang, and Joseph Piacenza. "Exploring Design Trades to Extend Useful Life of Platform Terminal Transmitters on Sea Turtles." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97473.

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Abstract Satellite-linked platform terminal transmitters (PTTs) are important tools for conducting research of sea turtles in their marine habitats. Appropriate conservation actions can be identified using PTTs, mounted to the top of sea turtles’ shells, to collect information about migratory routes and habitat usage. However, there is concern that PTTs introduce hydrodynamic drag that may bias natural sea turtle behavior, making the migratory and habitat data inaccurate representations of the “untagged” population. PTTs also have limited attachment durations, hypothesized to be caused by hydrodynamic loading and shell expansion during growth. The aim of this research is to investigate the hydrodynamic drag induced by PTTs on juvenile hard-shelled sea turtles, with the broader goal of increasing deployment duration and minimizing behavioral effects. A computational fluid dynamics (CFD) model was created to simulate the hydrodynamics of juvenile sea turtles. The drag and lift coefficients for five PTTs, virtually attached to the sea turtle model, were calculated using numerical methods. A comparison table of PTT performance is presented. The results will be used to explore PTT form factor design trades-offs that reduce hydrodynamic loading, while still meeting operational requirements. This research could enable biologists to collect data that more accurately represents the untagged sea turtle population.
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Priambodo, Bagus, Ahmad Muammar Kadafi, Muhamad Prayogi Erfanda, Ahmad Ali Mustofa, Richo Firmansyah, Rohman Rohman, and Dwi Listyorini. "Ecology and population estimation of Asian leaf turtle (Cyclemis dentata) from Sukamade, Meru Betiri National Park, Indonesia." In THE 4TH INTERNATIONAL CONFERENCE ON LIFE SCIENCE AND TECHNOLOGY (ICoLiST). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0111413.

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Tabunșcic, Olga. "Poppy cakes — preparation traditions." In Simpozion internațional de etnologie: Tradiții și procese etnice, Ediția III. Institute of Cultural Heritage, Republic of Moldova, 2023. http://dx.doi.org/10.52603/9789975841733.14.

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Traditional gastronomy, along with history, culture, religion and ethnicity, continues to play an important role in defi ning national and individual identity. Th e intense pace of modern life in recent decades is changing the conception of food very rapidly, and gastronomic traditions are collapsing dramatically under the action of the new preferences of the population to feed themselves. Th e tendency to standardize the taste in terms of food, leads to the disappearance of diversity and culinary identity. Th us, more and more traditional dishes, full of taste, value and history, tend to be forgotten. In the trend of revitalization of poppy cakes, the results of the study are presented within the State Program 20.8009.0807.17 REVICULT; the recipe being found in the Republic of Moldova (north and center), as well as in Moldova and Transylvania, Romania. Poppy cakes (Turte cu mac) are considered fasting dishes. Th ose prepared on Christmas Eve are called Th e Diapers/Wormwoods of the Lord, Julfe, Christmas Cakes referring to the diapers in which the Jesus Christ was wrapped at birth, recording the end of the fasting and being off ered as alms. Th ey are attested, according to several sources, in existence for hundreds of years, the recipes being transmitted from generation to generation and adapted to the possibilities of the time. Th us, we fi nd in some localities cakes prepared and covered only with poppy, aft er their burial (Tarasova village, Mateuţi village, Rezina district), in other localities buried with julfă (mixture of water sweetened with honey, with shredded hemp seeds in the square and passed through the sieve) (Drochia district), covered with shredded walnuts and with poppy or only with poppy (v. Salcia, v. Climatuţii de Jos, v. Socola, v. Vadul-Rascov, Floreși/Kamenka/Soldanesti district, Ungheni district, Donduseni district). Th e utensils used in the preparation of various sweet dishes, such as macohon, marcoteţ, budăiul, etc. are of interest for the study.
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Reports on the topic "Turtle populations"

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Francklin Barbier, Francklin Barbier. Understanding the migration routes of Haiti's endangered sea turtle populations. Experiment, April 2023. http://dx.doi.org/10.18258/49730.

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Michaels, Trevor. Red-tailed boa (Boa constrictor) surveys at Salt River Bay National Park, St. Croix U.S. Virgin Islands: 2023 report of activities. National Park Service, 2024. http://dx.doi.org/10.36967/2303799.

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St. Croix is home to a variety of threatened and endangered (T&E) species that are at risk for predation by the invasive red-tailed boa (Boa constrictor), such as the St. Croix ground lizard (Amevia polyps), the ground-nesting least tern (Sterna antillarum), and the hawksbill sea turtle (Eretmochelys imbricata). Genetic analysis determined the original red-tailed boa population on St. Croix sourced from a single female released by a pet owner and its range expands every year. Presently, the main population of red-tailed boa is established on the west end of St. Croix and extends as far east as Salt River. One individual was found in Salt River Marina and additional sightings have occurred in Salt River Bay National Historical Park and Ecological Preserve (SARI) more recently. This inventory aims to search for red-tailed boas in two focal areas that park staff are actively restoring. The park will use information from this inventory to develop a boa removal program and protect sensitive native species like the ground-nesting least tern, the St. Croix ground lizard and the hawksbill sea turtle nests and increase the success of restoration. Snakes are cryptic species, often occurring in low density, and utilize complex habitat patterns. To increase the likelihood of detecting red-tailed boa, the Maryland/Delaware/D.C. Wildlife Services detector dog handling team partnered with the USDA-APHIS National Detector Dog Training Center to train and develop detector dogs to assist in determining the presence/absence of red-tailed boa for this project. Canines were trained to locate red-tailed boa and indicate its presence to the handler via barking three times near the identified target. Two dog detector teams traveled to Salt River Bay National Park (SARI) in St. Croix to conduct surveys for red-tailed boa in habitats likely to contain red-tailed boa in June 2023. Habitat varied throughout the surveys. Close to the bay, mangrove forests dominated and, as elevation increased, transects took place in almost exclusively dry tropical shrub forest. Each transect was surveyed by one dog team. The canine teams had no red-tailed boa detections within SARI. Canines showed proficiency at surveying for red-tailed boa populations in SARI. Given the proximity of confirmed detections to SARI, it is likely red-tailed boa will be in the park in the future, if they are not already. Additional surveys, whether by humans, canines, or both, are recommended in areas of the park that have not been previously surveyed.
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Duffield, John, and Chris Neher. Incorporating deer and turtle total value in collision mitigation benefit-cost calculations. Nevada Department of Transportation, September 2021. http://dx.doi.org/10.15788/ndot2021.09.1.

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This document is a task report for a larger Wildlife Vehicle Collision (WVC) Reduction and Habitat Connectivity pooled fund study. It addresses the potential use of passive use economic values for wildlife to inform the mitigation of wildlife-vehicle collisions. Passive use, also known as non-use values, are the values individuals place on the existence of a given animal species or population as well as the bequest value of knowing that future generations will also benefit from preserving the species. This report describes a pilot survey and study of willingness to pay by Minnesota households to pay for exclusionary fencing and passage structures to reduce vehicle/animal collisions in the state. The species of focus were deer and turtles. The study found strong support for fencing and passage structures, and statistically significant willingness to pay increased taxes to support their construction.
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Ruedin, Didier, Dina Bader, and Chloé Salathé. Panorama de la diversité au sein du personnel de l’administration de la Ville de La Chaux-de-Fonds. Université de Neuchâtel – Swiss Forum for Migration and Population Studies (SFM), September 2023. http://dx.doi.org/10.35662/unine-sfmstudies-85.

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La Ville de La Chaux-de-Fonds s’engage à donner l’exemple et à veiller au respect d’une administration exemplaire et ouverte à la diversité, respectueuse de la dignité et du bien-être de ses employé·e·s. En menant une enquête auprès de ses employé·e·s, la Ville de La Chaux-de-Fonds a fait preuve d’une démarche innovatrice en Suisse dans le traitement des questions de diversité et de discrimination au sein de l’environnement professionnel. L’enquête a révélé une diversité parmi les employé·e·s, comprenant le genre, le pays de naissance et l’origine migratoire. Si les nationalités les plus nombreuses de la ville sont présentes parmi les répondant·e·s de l’enquête, on observe une absence des personnes d’origine érythréenne (1% de la population) et turque (0.8% de la population). Il est légitime de se demander si la représentativité des groupes sous-représentés pourrait être augmentée afin de profiter des compétences de toute la population active. Au total, 34 pays de naissance et 22 nationalités sont représentés parmi les répondant·e·s de l’enquête. Parmi les nationalités étrangères, on trouve principalement des nationalités d’Europe de l’Ouest. La grande majorité des employé·e·s parle le français à la maison, soit 94%. Cependant, l’expérience de la discrimination est une réalité pour une part importante des employé·e·s de la Ville. Parmi ceux·celles qui ont subi une forme de discrimination, les raisons mentionnées le plus fréquemment sont le genre et l’âge, suivis de l’origine nationale. La conciliation entre la vie professionnelle et la vie familiale reste un sujet important, surtout parmi les répondant·e·s avec des responsabilités de soutien envers des personnes tierces. De manière générale, davantage de flexibilité dans les offres et dans les horaires de travail est souhaité afin de pouvoir répondre à des impératifs familiaux sans prétériter le travail.
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