Journal•ISSN: 1071-8443
Chelonian Conservation and Biology
Allen Press
About: Chelonian Conservation and Biology is an academic journal published by Allen Press. The journal publishes majorly in the area(s): Turtle (robot) & Population. It has an ISSN identifier of 1071-8443. Over the lifetime, 684 publications have been published receiving 9821 citations.
Topics: Turtle (robot), Population, Sea turtle, Nest, Tortoise
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TL;DR: This work compiled museum and literature occurrence records for all of the world's tortoises and freshwater turtle species to determine their distributions and identify priority regions for conservation and identifies 3 new global Turtle Priority Areas for conservation based on aggregated Ecoregions.
Abstract: There are currently ca. 317 recognized species of turtles and tortoises in the world. Of those that have been assessed on the IUCN Red List, 63% are considered threatened, and 10% are critically endangered, with ca. 42% of all known turtle species threatened. Without directed strategic conservation planning, a significant portion of turtle diversity could be lost over the next century. Toward that conservation effort, we compiled museum and literature occurrence records for all of the world's tortoises and freshwater turtle species to determine their distributions and identify priority regions for conservation. We constructed projected range maps for each species by selecting geographic information system–defined hydrologic unit compartments (HUCs) with verified locality points, and then added HUCs that connected known point localities in the same watershed or physiographic region and that had similar habitats and elevations as the verified HUCs. We analyzed a total of 305 turtle species and assi...
216 citations
University of Southern California1, Charles Darwin University2, Wildlife Conservation Society3, University of Western Australia4, United States Geological Survey5, University of Georgia6, Universiti Malaysia Sarawak7, Yahoo!8, Chester Zoo9, University of the Western Cape10, Earlham College11, University of Antioquia12, Universidad Autónoma de Ciudad Juárez13, University of Toliara14, James Cook University15, Millsaps College16, University of California, Los Angeles17, Hainan Normal University18, University of Sydney19, University of São Paulo20, National Institute of Amazonian Research21
TL;DR: The order Testudines is, on average, more imperiled than all other larger orders (≥ 20 species) of Reptilia, Amphibia, Mammalia, or Aves, but has percentages of CR+EN and Threatened species and an ATL similar to those of Primates and Caudata (salamanders).
Abstract: We present a review and analysis of the conservation status and International Union for Conservation of Nature (IUCN) threat categories of all 360 currently recognized species of extant and recently extinct turtles and tortoises (Order Testudines). Our analysis is based on the 2018 IUCN Red List status of 251 listed species, augmented by provisional Red List assessments by the IUCN Tortoise and Freshwater Turtle Specialist Group (TFTSG) of 109 currently unlisted species of tortoises and freshwater turtles, as well as re-assessments of several outdated IUCN Red List assessments. Of all recognized species of turtles and tortoises, this combined analysis indicates that 20.0% are Critically Endangered (CR), 35.3% are Critically Endangered or Endangered (CR+EN), and 51.9% are Threatened (CR+EN+Vulnerable). Adjusting for the potential threat levels of Data Deficient (DD) species indicates that 56.3% of all data-sufficient species are Threatened. We calculated percentages of imperiled species and modifi...
167 citations
Journal Article•
TL;DR: A 16-year population study of diamondback terrapins in a South Carolina, USA, salt marsh found that adult females were significantly larger but less numerous than adult males and most of the terrapin captured in the tidal creeks were sexually mature.
Abstract: We used mark-recapture data from 1274 original captures and 1131 recaptures during a 16-year population study of diamondback terrapins (Malaclemys terrapin) in a South Carolina, USA, salt marsh to examine demography and ecological factors critical for management recommen- dations and conservation. Adult females were significantly larger but less numerous than adult males. Most of the terrapins captured in the tidal creeks were sexually mature, first- and second-year individuals being absent and third- and fourth-year individuals being scarce, suggesting the use of a different habitat by juveniles. Most individuals exhibited high site fidelity, remaining in the same creek from year to year, although similar creeks were nearby. The observation that individuals rarely moved between adjacent tidal creeks and remained in one small area as adults is of particular significance to management considerations for the species. Terrapin numbers in one creek were high during the 1980s and declined steadily after 1990, with only a single individual being present after 1993. The combination of high site fidelity and limited dispersal by terrapins from other creeks and the onset of recreational crab trapping and other human activities are presumed to have been responsible for the disappearance of the population. Without the implementation of strong measures to assure sustainability of terrapin populations throughout the range, continued population declines are likely.
118 citations
TL;DR: Characteristics of the sand, level and frequency of tidal inundation, and hatching success at loggerhead sea turtle (Caretta caretta) nest sites on 8 low-relief mangrove islands in the northern half of the Ten Thousand Islands in southwest Florida were determined.
Abstract: We determined characteristics of the sand, level and frequency of tidal inundation, and hatching success at loggerhead sea turtle (Caretta caretta) nest sites on 8 low-relief mangrove islands in the northern half of the Ten Thousand Islands in southwest Florida. The sand was generally composed of larger particles and tended to be wetter, more porous, and more saline than on other loggerhead nesting beaches. More than one-third (38.9%) of the nest sites experienced tidal inundation. The mean salinity of inundating water was 26.9‰ (± 9.3, range = 0–40). The water content and salinity of the sand water at nest sites increased with increasing frequency of inundations. The mean particle diameter and total porosity of the sand were negatively related to sand water salinity, perhaps indicating that in the largest-grained, most porous sands, salt was more effectively washed out by rainfall. Hatching success decreased as inundations, sand water content, and sand water salinity increased. However, at nest ...
107 citations
Journal Article•
TL;DR: It is suggested that within the next five years the number of captive breeding schemes for the western swamp tortoise Pseudemydura umbrinarecovery programme should be expanded to include at least two species of tortoise.
Abstract: 1992. Beyond captive breeding: the western swamp tortoise Pseudemydura umbrinarecovery programme. Int il)Q . Yb. 31 :37-41. LAPID, R., AND RosINZoN, B. 1997. Shell deformations in hatchling tortoises (Testudo graeca): results from X-ray radiography of mothers during pregnancy. Abstract, 3rd World Congress of Herpetology, Prague, pp. 122-123. LoYEZ, M. 1906. Recherches sur le developpement ovarien des oeufs meroblastiques a vitellus nutritif abondant. Arch. Anat. Microscop. Morph. Exp. 8:69-398. PENNINCK, D.G., STEWART, J.S., PAUL-MURPHY , J., AND PION, P. 1991. Ultrasonography of the Californian desert tortoise (Xerobates agassizi): anatomy and application. Vet. Radio!. 32: 112-116. PwTKJN, P.T., RoSTAL, D.C., BYLES, R.A., AND OwENs, D.W. 1997. Reproductive and developmental synchrony in femaleLepidnchelys olivacea. J. Herpetol. 31:17-22. RosTAL, D.C., RosEcK, T.R., OWEN, D.W., AND KRAEMER, D.C. 1990. Ultrasound imaging of ovaries and eggs in Kemp's ridley sea turtles (Lepidochelys kempi). J. Zoo. Wild!. Med. 21:27-35. RosTAL,D.C.,LAN CE, V.A.,GRUMBLES,J.S.,ANDALBERTs,A.C.1994. Seasonalreproductivecyclesofthedeserttortoise(Gophernsagassizil) in the eastern Mojave Desert. Herpetol. Monogr. 8:72-82. RosTAL, D.C., PALADINO, F.V., PATTERSON, R.M., AND SPOTILA, J.R. 1996. Reproductive physiology of nesting leatherback turtles (Dermochelys coriacea) at Las Baulas National Park, Costa Rica. Chelon. Conserv. Biol. 2:230-236. W ALDEYER, W . 1870. Eierstock und Ei. Leipzig: Wilhelm Engelmann, 174 pp. WEBB, G.J.W. 1997. Sustainable use of wildlife. Aust. Biologist 10:3-11.
96 citations