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Journal articles on the topic 'Turtle populations'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2024

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1

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 (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 ext

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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 (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 adult

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3

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 (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 distributio

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Johnston, Gerald R., Joseph C. Mitchell, Eric Suarez, et al. "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 (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 tann

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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 (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

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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 (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 be

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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 (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

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8

Butynski, Thomas M. "Marine turtles on Bioko Island, Equatorial Guinea." Oryx 30, no. 2 (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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9

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-ev

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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 (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 si

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Putman, Nathan F., Jesse Hawkins, and Benny J. Gallaway. "Managing fisheries in a world with more sea turtles." Proceedings of the Royal Society B: Biological Sciences 287, no. 1930 (2020): 20200220. http://dx.doi.org/10.1098/rspb.2020.0220.

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For decades, fisheries have been managed to limit the accidental capture of vulnerable species and many of these populations are now rebounding. While encouraging from a conservation perspective, as populations of protected species increase so will bycatch, triggering management actions that limit fishing. Here, we show that despite extensive regulations to limit sea turtle bycatch in a coastal gillnet fishery on the eastern United States, the catch per trip of Kemp's ridley has increased by more than 300% and green turtles by more than 650% (2001–2016). These bycatch rates closely track regio

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Dupuis-Desormeaux, Marc, Christina Davy, Amy Lathrop, et al. "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 nestin

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13

Nada, Mohamed, and Paolo Casale. "Sea turtle bycatch and consumption in Egypt threatens Mediterranean turtle populations." Oryx 45, no. 1 (2011): 143–49. http://dx.doi.org/10.1017/s0030605310001286.

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AbstractTurtle trade in the fish markets of Alexandria was reported up to the late 1990s, motivating conservation initiatives and enforcement of legal protection. To assess the current trade and bycatch levels in Alexandria and other ports we carried out an interview survey of 445 people in 2007, mostly fishermen and fishmongers, in 15 coastal cities and fishing ports along the Mediterranean coast of Egypt. The declared catch rates and official fishing fleet statistics suggest that captures of loggerhead Caretta caretta and green turtles Chelonia mydas are in the order of several thousands per

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Vanek, John P., and Gary A. Glowacki. "Assessing the Impacts of Urbanization on Sex Ratios of Painted Turtles (Chrysemys picta)." Diversity 11, no. 5 (2019): 72. http://dx.doi.org/10.3390/d11050072.

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Turtles are particularly susceptible to the negative impacts of urbanization due to low mobility and a life history strategy emphasizing long generation times and high adult survival. In addition to declines directly through habitat loss, urbanization has been hypothesized to limit populations of aquatic turtles through changes in population structure, as adult females are disproportionally killed on and near roads, leading to male-biased populations, which can lead to population declines or local extirpations. The purpose of this study was to better understand how urbanization impacts the sex

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15

Gribble, N. A., G. McPherson, and B. Lane. "Effect of the Queensland Shark Control Program on non-target species: whale, dugong, turtle and dolphin: a review." Marine and Freshwater Research 49, no. 7 (1998): 645. http://dx.doi.org/10.1071/mf97053.

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The Queensland Shark Control Program (QSCP) has recorded a long-term annual mortality of 0.1 humpback whale, 2 ‘small whales’ (species uncertain), 20 dugong, <78 turtles (species and number released uncertain), and <19 dolphin (species and number released uncertain). Available population estimates suggest that the historic impact of the QSCP would have been negligible on whales, 0.5% per year of the dugong population in the southern Great Barrier Reef, minor on green and loggerhead turtle populations, and unknown but probably minor on leatherback turtles and dolphin populations. In respo

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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 (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, eco

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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 (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 gree

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SAMSOL, SYAMSYAHIDAH, MOHD EFFENDY ABD WAHID, TSUNG-HSIEN LI, and MOHD UZAIR RUSLI. "HEMATOLOGY, BLOOD GASES AND BIOCHEMISTRY PROFILES OF WILD-NESTING SEA TURTLES IN TERENGGANU, MALAYSIA." Malaysian Applied Biology 49, no. 4 (2021): 25–31. http://dx.doi.org/10.55230/mabjournal.v49i4.1564.

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Chelonia mydas is an endangered marine species globally, which its reference blood parameters intervals have been published for some group populations, but baseline health status values are lacking from Malaysia. This study aims to better understand the hematology, biochemical, and blood gas of a wild-nesting green turtle population in the South China Sea. The health status of nesting turtles at the Chagar Hutang Turtle Sanctuary, Pulau Redang, were performed on different individuals, (26 females laid one nest and 2 females laid two nests). A portable handheld blood analyzer (iSTAT) used in th

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Aiken, Jonathan J., Brendan J. Godley, Annette C. Broderick, Timothy Austin, Gina Ebanks-Petrie, and Graeme C. Hays. "Two hundred years after a commercial marine turtle fishery: the current status of marine turtles nesting in the Cayman Islands." Oryx 35, no. 2 (2001): 145–51. http://dx.doi.org/10.1046/j.1365-3008.2001.00168.x.

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AbstractLarge populations of marine turtles breeding in the Cayman Islands were drastically reduced in the early 1800s. However, marine turtle nesting still occurs in the islands. The present-day status of this nesting population provides insight into the conservation of marine turtles, a long-lived species. In 1998 and 1999, the first systematic survey of marine turtle nesting in the Cayman Islands found 38 nests on 22 beaches scattered through the three islands. Three species were found: the green Chelonia mydas, hawksbill Eretmochelys imbricata and loggerhead Caretta caretta turtles. Compar

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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 (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 t

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Shiping, Gong, Wang Jichao, Shi Haitao, Song Riheng, and Xu Rumei. "Illegal trade and conservation requirements of freshwater turtles in Nanmao, Hainan Province, China." Oryx 40, no. 3 (2006): 331–36. http://dx.doi.org/10.1017/s0030605306000949.

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China has one of the world's most diverse freshwater turtle faunas but is also a major consumer of freshwater turtles. In the 1980s over-collecting, illegal trade and habitat destruction increased dramatically, pushing almost all Chinese turtles towards extinction. Despite the critical status of Chinese turtles little has been done to quantify and evaluate the impact of illegal activities on wild populations. We used a combination of market surveys and questionnaires to examine the illegal trade and conservation status of native freshwater turtles in Nanmao, Hainan Province, from February to A

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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 (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 cent

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Hudgins, Jillian A., Emma J. Hudgins, Stephanie Köhnk, Enas Mohamed Riyad, and Martin R. Stelfox. "A brighter future? Stable and growing sea turtle populations in the Republic of Maldives." PLOS ONE 18, no. 4 (2023): e0283973. http://dx.doi.org/10.1371/journal.pone.0283973.

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The Indian Ocean represents a significant data gap in the evaluation of sea turtle population status and trends. Like many small island states, the Republic of Maldives has limited baseline data, capacity and resources to gather information on sea turtle abundance, distribution and trends to evaluate their conservation status. We applied a Robust Design methodology to convert opportunistic photographic identification records into estimates of abundance and key demographic parameters for hawksbill sea turtles (Eretmochelys imbricata) and green sea turtles (Chelonia mydas) in the Republic of Mal

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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 (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 min

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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. S

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Enneson, J. J., and J. D. Litzgus. "Stochastic and spatially explicit population viability analyses for an endangered freshwater turtle, Clemmys guttata." Canadian Journal of Zoology 87, no. 12 (2009): 1241–54. http://dx.doi.org/10.1139/z09-112.

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Over two thirds of the world’s turtle species are in decline as a result of habitat destruction and harvesting. Quantitative methods for predicting the risk of extinction of turtle populations are essential for status assessments and recovery planning. Spotted turtles ( Clemmys guttata (Schneider, 1792)) are considered vulnerable internationally, and endangered in Canada. We used population viability analysis to assess the risk of extirpation of a Georgian Bay, Ontario, population that has been under study since 1977 and of nine Ontario populations for which population size is known, and to ex

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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 (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 Blandin

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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 (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 metal

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Booth, DT, A. Dunstan, I. Bell, R. Reina, and J. Tedeschi. "Low male production at the world’s largest green turtle rookery." Marine Ecology Progress Series 653 (October 29, 2020): 181–90. http://dx.doi.org/10.3354/meps13500.

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Because the sex of all sea turtle hatchlings is determined by incubation temperature, with low temperatures producing mainly males and high temperatures producing mainly females, sea turtle populations worldwide are threatened by feminization of hatchlings due to increases in global temperature. Data obtained by laparoscopic sexing of immature individuals captured from a major feeding ground indicates that over several decades there has been little recruitment of males into the northern Great Barrier Reef (nGBR) green turtle Chelonia mydas population, one of the largest sea turtle populations

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Naguib, Nahla M., Ahmed Salama, Islam M. Elsadek, et al. "Using ISSR markers to detect genetic variation for marine turtles populations in Egypt loggerhead (Caretta caretta) and green turtles (Chelonia mydas)." Journal of Aquaculture & Marine Biology 13, no. 1 (2024): 37–42. http://dx.doi.org/10.15406/jamb.2024.13.00394.

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In Egypt, along the Mediterranean coast, the loggerhead (Caretta caretta) and green (Chelonia mydas) come during nesting season to lay their eggs or for food with a rare occurrence for the leatherback turtle (Dermochelys coriacea). In the Egyptian Red Sea there are five species that come to visit, the most common to observe are hawksbill (Eretmochelys imbricata) and green (Chelonia mydas). The goal of this study is to conduct some genetic and ecological analyses a) to generate new markers that include other segments of marine turtles’ genome, as a tool to investigate new areas of variation/pol

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Mortimer, Jeanne A., Nicole Esteban, Antenor Nestor Guzman, and Graeme C. Hays. "Estimates of marine turtle nesting populations in the south-west Indian Ocean indicate the importance of the Chagos Archipelago." Oryx 54, no. 3 (2020): 332–43. http://dx.doi.org/10.1017/s0030605319001108.

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AbstractGlobal marine turtle population assessments highlight the importance of the south-west Indian Ocean region, despite data gaps for the Chagos Archipelago. The archipelago hosts nesting hawksbill Eretmochelys imbricata and green turtles Chelonia mydas, both heavily exploited for 2 centuries until protection in 1968–1970. We assessed available nesting habitat and spatial distribution of nesting activity during rapid surveys of 90% of the archipelago's coastline in 1996, 1999, 2006 and 2016. We quantified seasonality and mean annual egg clutch production from monthly track counts during 20

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Alejandro, Alejandro Jr. "Road mortality of freshwater turtles in Palawan, Philippines." Palawan Scientist 11 (July 2019): 97–111. http://dx.doi.org/10.69721/tps.j.2019.11.1.08.

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The impact of road mortality on freshwater turtle populations on a global scale could be significant enough to cause the extinction of sensitive species. Essential data on roadkill abundance, composition, spatial patterns, and temporal distribution is needed for crafting mitigation strategies. To provide such information, a survey was conducted along the highway section (67 km) connecting Aborlan and Puerto Princesa City in Palawan, Philippines. Collection of data was done four times a month from January 2010 to December 2015. A total of 127 road-killed turtles belonging to two species of the

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Zuffi, Marco A. L., Alice Spinelli, Vuk Ikovic, Marco Mangiacotti, Roberto Sacchi, and Stefano Scali. "Population size and density in two European pond turtle populations of central Italy." Amphibia-Reptilia 41, no. 4 (2020): 461–67. http://dx.doi.org/10.1163/15685381-bja10014.

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Abstract Two populations of the European pond turtle were studied employing capture, marking and recapture (CMR) techniques to determine population density and abundance in natural and protected areas within the Regional Natural park Migliarino San Rossore Massaciuccoli in north western Tuscany, Italy. The results indicated strong sexual size dimorphism in both populations, with males smaller than females. In one area Emys orbicularis was in general smaller in size with a very low reproductive rate (three out of 25 adult females were gravid), which contrasted with a second population where 20

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Davy, Christina M., and Robert W. Murphy. "Conservation genetics of the endangered Spotted Turtle (Clemmys guttata) illustrate the risks of “bottleneck tests”." Canadian Journal of Zoology 92, no. 2 (2014): 149–62. http://dx.doi.org/10.1139/cjz-2013-0188.

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Studies of population genetics in turtles have suggested that turtles do not experience genetic impacts of bottlenecks as strongly as expected. However, recent studies cast doubt on two commonly used tests implemented in the program BOTTLENECK, suggesting that these findings should be re-evaluated. The Spotted Turtle (Clemmys guttata (Schneider, 1792)) is endangered both globally and within Canada, but genetic data required to develop effective recovery strategies are unavailable. Here, we conducted the first study of population genetic structure in C. guttata. We then used multiple small popu

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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 (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 fisher

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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 (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 fisher

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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 (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 attent

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Braman, Charles A., Joseph B. Pfaller, Kristina L. Williams, and Brian T. Forschler. "Presence of Native and Non-native Ants Linked to Lower Emergence Success of Loggerhead Sea Turtle Nests: Implications for Management." Environmental Entomology 50, no. 3 (2021): 649–57. http://dx.doi.org/10.1093/ee/nvab021.

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Abstract Ants have been suggested as one of many population pressures sea turtles face potentially affecting nesting-beach survival of eggs and hatchlings. However, little is known about the extent to which ants act as incidental or primary mortality factors. Most research has focused on New World fire ants (genus Solenopsis), with confirmed records of other ant species interactions with sea turtle nests in situ being rare. Our study documented the ant species associated with loggerhead sea turtle Caretta caretta (Linnaeus) (Testudines: Cheloniidae) nests in Georgia and determined if ant prese

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Olendo, Mike I., Gladys M. Okemwa, Cosmas N. Munga, et al. "The value of long-term, community-based monitoring of marine turtle nesting: a study in the Lamu archipelago, Kenya." Oryx 53, no. 1 (2017): 71–80. http://dx.doi.org/10.1017/s0030605317000771.

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AbstractMonitoring of nesting beaches is often the only feasible and low-cost approach for assessing sea turtle populations. We investigated spatio-temporal patterns of sea turtle nesting activity monitored over 17 successive years in the Lamu archipelago, Kenya. Community-based patrols were conducted on 26 stretches of beach clustered in five major locations. A total of 2,021 nests were recorded: 1,971 (97.5%) green turtleChelonia mydasnests, 31 (1.5%) hawksbillEretmochelys imbricatanests, 8 (0.4%) olive ridleyLepidochelys olivaceanests and 11 (0.5%) unidentified nests. Nesting occurred year-

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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 (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 No

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Platt, Steven G., Tint Lwin, Naing Win, Htay Lin Aung, Kalyar Platt, and Thomas R. Rainwater. "An interview-based survey to determine the conservation status of Softshell Turtles (Reptilia: Trionychidae) in the Irrawaddy Dolphin Protected Area, Myanmar." Journal of Threatened Taxa 9, no. 12 (2017): 10998. http://dx.doi.org/10.11609/jott.3632.9.12.10998-11008.

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We conducted an interview-based survey to investigate the conservation status of large (adult carapace length >400mm) Softshell Turtles (Amyda ornata, Chitra vandijki, and Nilssonia formosa) in the Irrawaddy Dolphin Protected Area (IDPA) of Myanmar during November 2015. Our objectives were to: (1) determine which species of Softshell Turtles occur in IDPA, (2) assess threats to these populations, (3) evaluate the protected area as a release site for captive-bred Softshell Turtles, and (4) make conservation recommendations. To this end, we interviewed 180 people (mostly males) in 30 villages

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Zhang, Ting, Liu Lin, Daniel Gaillard, et al. "Rapid authenticity testing of artificially bred green turtles (Chelonia mydas) using microsatellite and mitochondrial DNA markers." PeerJ 9 (October 28, 2021): e12410. http://dx.doi.org/10.7717/peerj.12410.

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Sea turtles are threatened by climate change and human activity, and their global populations continue to decline sharply. The Chinese government encourages artificial breeding of sea turtles to reduce the use of wild populations. However, artificial breeding of sea turtles is still fairly difficult, and some facilities may illegally purchase wild turtle eggs and then sell incubated turtles by marketing them as artificially bred turtles, which adds another threat to an already endangered species. Therefore, it is necessary to find a reliable method to distinguish the authenticity of artificial

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Hernández-Fernández, Javier, and Katherin Otálora. "Complete mitochondrial genome of the nesting Colombian Caribbean loggerhead turtle: first approach of tRNAs and phylogenetic analysis." Universitas Scientiarum 23, no. 3 (2018): 355–81. http://dx.doi.org/10.11144/javeriana.sc23-3.cccl.

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The loggerhead marine turtle, Caretta caretta, is a widely distributed and endangered species that is facing critical population decline, especially in Colombian Caribbean rookeries. Mitochondrial DNA sequence data are of great importance for the description, monitoring, and phylogenetic analyses of migratory turtle populations. In this study, the first full mitochondrial genome of a loggerhead turtle nesting in the Colombian Caribbean was sequenced and analyzed. This mitochondrial genome consists of 16 362 bp with a nucleotide composition of T: 25.7 %, C: 27 %, A: 35 % and G: 12 %. Sequence a

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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-do

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Whiting, AU, M. Chaloupka, N. Pilcher, P. Basintal, and CJ Limpus. "Sampling nesting sea turtles: optimizing survey design to minimize error." Marine Ecology Progress Series 674 (September 16, 2021): 257–70. http://dx.doi.org/10.3354/meps13824.

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Many sea turtle studies globally use counts of nesting activities as a proxy for population abundance estimates and as an indicator of trends within the population. Often these populations are sampled temporally and spatially, but few previous studies have examined the impact of different sampling techniques on the accuracy of these estimates. We investigated temporal sampling errors using a multi-species approach, examining 10 populations comprising green, loggerhead and leatherback sea turtles. Sampling errors were investigated from random, regular and continuous sampling regimes spanning 5-

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Georges, Arthur, Erika Alacs, Matthew Pauza, Felix Kinginapi, Amos Ona, and Carla Eisemberg. "Freshwater turtles of the Kikori Drainage, Papua New Guinea, with special reference to the pig-nosed turtle, Carettochelys insculpta." Wildlife Research 35, no. 7 (2008): 700. http://dx.doi.org/10.1071/wr07120.

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A survey of the Kikori River drainage of the Gulf Province of Papua New Guinea identified four species of freshwater turtle. The pig-nosed turtle Carettochelys insculpta and the southern New Guinea soft-shelled turtle Pelochelys bibroni are riverine species. The New Guinea spotted turtle Elseya novaeguineae lives primarily in the tidal freshwater creeks and streams, flooded sinkholes and swamps of the lowland rainforest. The New Guinea painted turtle Emydura subglobosa resides almost exclusively in forest sinkholes and swamps. Pelochelys bibroni was the least-common species, and is probably lo

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Greenblatt, Rebecca J., Sandra L. Quackenbush, Rufina N. Casey, et al. "Genomic Variation of the Fibropapilloma-Associated Marine Turtle Herpesvirus across Seven Geographic Areas and Three Host Species." Journal of Virology 79, no. 2 (2005): 1125–32. http://dx.doi.org/10.1128/jvi.79.2.1125-1132.2005.

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ABSTRACT Fibropapillomatosis (FP) of marine turtles is an emerging neoplastic disease associated with infection by a novel turtle herpesvirus, fibropapilloma-associated turtle herpesvirus (FPTHV). This report presents 23 kb of the genome of an FPTHV infecting a Hawaiian green turtle (Chelonia mydas). By sequence homology, the open reading frames in this contig correspond to herpes simplex virus genes UL23 through UL36. The order, orientation, and homology of these putative genes indicate that FPTHV is a member of the Alphaherpesvirinae. The UL27-, UL30-, and UL34-homologous open reading frames

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Brown, LJ, and CM Davy. "Evaluation of spot patterns and carapace abnormalities of an Endangered freshwater turtle, Clemmys guttata, as a potential tool for population assignment." Endangered Species Research 45 (June 17, 2021): 159–67. http://dx.doi.org/10.3354/esr01120.

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Many of the world’s contemporary species of turtle are extinct or threatened with extinction due to habitat loss, increases in anthropogenic sources of mortality, and poaching (illegal collection). The slow life-history strategy of most turtle species magnifies the effects of poaching because the loss of even a few mature individuals can impact population growth. Returning poached turtles to their population of origin, where possible, can mitigate these effects, but identifying the origin of these individuals can be challenging. We hypothesized that spot patterns might allow assignment of Enda

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Báez, José C., Raimundo Real, and Juan A. Camiñas. "Differential distribution within longline transects of loggerhead turtles and swordfish captured by the Spanish Mediterranean surface longline fishery." Journal of the Marine Biological Association of the United Kingdom 87, no. 3 (2007): 801–3. http://dx.doi.org/10.1017/s0025315407054744.

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Surface longline targeting mainly swordfish is considered a major threat for loggerhead turtle populations in the western Mediterranean Sea. For this reason, it is necessary to analyse the relationship between the characteristics of longline sets and loggerhead turtle by-catch. The objective of this study is to look for differential spatial distribution of loggerhead turtle and swordfish captures along the longline to gain insights that might be useful to diminish unintended, incidental catch of turtles without affecting the captures of the target species.Longlines are divided into transects s

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Habibullah, Lubis, Amirudin Suwaib, and Prafitri Nikki. "Implementasi Kebijakan Pengelolaan Kawasan Konservasi di Kecamatan Ciracap Kabupaten Sukabumi Jawa Barat." Epistemik: Indonesian Journal of Social and Political Science 4, no. 1 (2023): 16–26. http://dx.doi.org/10.57266/epistemik.v4i1.127.

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The turtle conservation area management policy is the basis for efforts to protect turtle populations that are threatened with extinction. Turtle as a protected animal, its population is important to be protected from extinction. The turtle conservation program has an important role in the management of turtle conservation as a means of achieving turtle sustainability and supporting community life. Through this policy on the management of the turtle conservation area, the Provincial Government and its working staff carry out conservation activities at Pangumbahan Beach, which is the locus of t

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