Download or read book Determining Population Demographics and Genetic Structure of an Endangered Species the Spotted Turtle Clemmys Guttata on the Delmarva Peninsula written by Stephanie Michelle Lamb and published by . This book was released on 2018 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Using Microsatellite DNA to Analyze Population Structure in Clemmys Guttata written by Maeghan L. Ciampa and published by . This book was released on 2011 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spotted turtle (Clemmys guttata) is a small, semiaquatic species that has been listed as a species of special concern in Massachusetts. Populations of the species on Nantucket Island exist in fragmented and possibly isolated populations, although the effect of this fragmentation on current population structure is unknown. This study attempted to look at the population structure of two populations, one from the Medouie Creek Wetland Complex on Nantucket Island and a mainland population from Halifax, MA. Microsatellite loci were examined to analyze the population genetics and compare two populations. Seven microsatellite loci were analyzed in 40 spotted turtles sampled from Nantucket Island and 10 turtles from Halifax. The seven microsatellite loci were found to be highly polymorphic. A total number of 92 alleles were found across all loci, with the number of alleles per locus ranging from seven to sixteen. Using various statistical tests, the multilocus genotypes of individuals in both populations were analyzed to determine population structure. Both populations were found to be i Hardy-Weinberg and linkage equilibrium and highly significant genetic variation was found within and between the Nantucket and Halifax populations. Private alleles were found in both populations across all microsatellite loci and analysis of these alleles indicates some loss of genetic diversity in the Nantucket Island population. Overall, the results of this study were used to classify the Nantucket Island and Halifax, MA populations as genetically distinct from each other and that all individuals sampled belong to two genetic clusters that correlate to geographic population assignment. These data suggest that the two populations should be regarded as distinct management units.
Download or read book Snack sized Turtles written by Amanda M. Rocker and published by . This book was released on 2022 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reptiles are experiencing decreased population sizes and declines in number of populations. Despite this overall pattern, for many species, there remains insufficient data to understand population trends, let alone the specific causes of these declines. One species experiencing severe declines, but sparse assessment is the spotted turtle (Clemmys guttata), a freshwater species found in wetlands in Eastern North America and classified as endangered under the IUCN Red List. This decline likely has occurred because of potential threats such as predation, collection for the pet trade, and habitat loss. I studied the size class distributions of turtles in Maryland and Delaware populations based on frequency of juvenile and adult turtles. I found that C. guttata populations had a negatively skewed size distributions at all study sites. However, they were primarily individuals in the 90-100 mm plastron length size range, while larger, older, individuals were not typically present. Additionally, I analyzed the potential predation of C. guttata based on predator-caused injuries and assessing predator abundance via camera traps. Clemmys guttata had a greater rate of predator-caused injuries compared to other common turtle species; however, there was no correlation between injury rate and predator activity, specifically regarding raccoons (Procyon lotor). My results suggest while there was a large proportion of adults in populations of C. guttata at my sites, very old adults were absent. This was potentially caused, in part, due to predation, but the explanation for high injury rates of C. guttata is complicated and likely involves other factors such as human removal for the pet trade.
Download or read book The Population Dynamics of the Spotted Turtle Clemmys Guttata on Carroll Island written by Wayne G. Landis and published by . This book was released on 1983 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The population dynamics and structure of the spotted turtle, Clemmys guttata, were studies from 1970 until 1982. Carroll Island was the site of chemical testing from post WW II until 1971. Special consideration was given to the impact upon the populations of turtles by the chemicals released on Carroll Island. Several findings are noteworthy. The number of juveniles on the island has steadily declined over the 12 years of sampling. The current (1982) population is half of that estimated for 1972-73. The proportion of females dropped as low as 0.25 of the population. Four possible hypotheses are delivered to explain the observations. The most likely explanations are that a temperature anomaly or natural catastrophe dramatically reduced the proportion of females present. At the same time the population of turtles overshot the carrying capacity of the environment after cessation of an artificial or natural constraint.
Download or read book Conservation Genetics of Freshwater Turtles written by Christina M. Davy and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Revising a Habitat Suitability Model for Spotted Turtles Clemmys Guttata in Upstate New York written by Caitlin Dailey and published by . This book was released on 2017 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In order to protect threatened and endangered species, their habitat needs to be adequately documented and assessed for conservation planning. The utilization of mapping programs such as ArcGIS can help researchers in determining the most optimal sites for a particular species in a given area. This research revises a previous habitat suitability model by Correa-Berger (2007) for the spotted turtle (Clemmys guttata) in nine counties of upstate New York. Using the same initial parameters for the creation of the seed sites and habitat requirements for spotted turtles that Correa-Berger used in his 2007 analysis, the model utilized updated Land Use/Land Cover (LULC) data, added a stream connectivity parameter, and added a calcium carbonate soil parameter in order to improve the model. The initial updated model did not fit well with the historical spotted turtle sightings from the NYSDEC. A second model was created using a simplified seed site methodology, an adjusted road width parameter, and eliminated the use of the DEC classified wetlands. The revised model captured 16 out of 33 turtle sightings within what was considered optimal sites. While the second model was more successful matching the historical spotted turtle sightings compared to the first model, analysis of model misses suggest the model could potentially be improved with the use of a locally created LULC classification using remote sensing techniques, expanding the stream connectivity parameters to include stream health, and using additional soil parameters."--Abstract.
Download or read book An Investigation of Shell part Ratios Spot Characteristics Growth and Population Structure and Stability in the Spotted Turtle Clemmys Guttata Schneider written by Silas C. C. Wade and published by . This book was released on 1976 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics and Demography of Wisconsin Turtles written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turtles (order Testudines) are an ancient but highly threatened vertebrate group. Successful preservation of biodiversity in this group (as in others) requires identification of current threats, species-level traits that modulate vulnerability to these threats, and both general and species-specific strategies for mitigating threats. In this dissertation, I address these research needs for several Wisconsin turtles, focusing on the UCN-Endangered Blanding's turtle (Emydoidea blandingii). The approaches used here encompass multiple spatial scales, combine genetic and demographic methods of characterizing population viability and spatial ecology, and utilize comparisons among species, specifically by comparing endangered Blanding's turtles with more common co-occurring painted turtles (Chrysemys picta) and snapping turtles (Chelydra serpentina). Each chapter of this dissertation is written and formatted as a manuscript for publication in a scholarly journal. Chapter 1 (published in Diversity and Distributions) investigates the population-level demographic and genetic responses of three turtle species with differing habitat preferences and life histories to roads and climate. Chapter 2 (prepared for submission to Molecular Ecology) describes the effects of past and present landscape features on population genetic structure in this same suite of turtle species. Chapter 3 (submitted to Methods in Ecology and Evolution) develops a novel method for estimating dispersal rates from genetic kinship data and uses this method to investigate the spatial ecology of nesting female Blanding's turtles. Finally, Chapter 4 (submitted to Biological Conservation) deals with the demographic response of a population of Blanding's turtles to habitat restoration. Overall, the work collected here demonstrates how differences in species' life history traits and habitat preferences can affect their vulnerability to environmental change and suggests how strategies for managing populations and genetic diversity can be tailored to these traits.
Download or read book Demography of the Spotted Turtle clemmys Guttata in Illinois written by Christina Yen Feng and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microhabitat Parameters and Spatial Ecology of the Spotted Turtle Clemmys Guttata written by Thomas P. Wilson and published by . This book was released on 2002 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Endangered and Threatened Species Determination of Nine Distinct Population Segments of Loggerhead Sea Turtles As Endangered Or Threatened Us National Oceanic and Atmospheric Administration Regulation Noaa 2018 Edition written by The Law Library and published by . This book was released on 2018-12-12 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Law Library presents the complete text of the Endangered and Threatened Species - Determination of Nine Distinct Population Segments of Loggerhead Sea Turtles as Endangered or Threatened (US National Oceanic and Atmospheric Administration Regulation) (NOAA) (2018 Edition). Updated as of May 29, 2018 We (NMFS and USFWS; also collectively referred to as the Services) have determined that the loggerhead sea turtle (Caretta caretta) is composed of nine distinct population segments (DPSs) that constitute "species" that may be listed as threatened or endangered under the Endangered Species Act (ESA). In this final rule, we are listing four DPSs as threatened and five as endangered under the ESA. We will propose to designate critical habitat for the two loggerhead sea turtle DPSs occurring within the United States in a future rulemaking. We encourage interested parties to provide any information related to the identification of critical habitat and essential physical or biological features for this species, as well as economic or other relevant impacts of designation of critical habitat, to assist us with this effort. This ebook contains: - The complete text of the Endangered and Threatened Species - Determination of Nine Distinct Population Segments of Loggerhead Sea Turtles as Endangered or Threatened (US National Oceanic and Atmospheric Administration Regulation) (NOAA) (2018 Edition) - A dynamic table of content linking to each section - A table of contents in introduction presenting a general overview of the structure
Download or read book Geographic Variation in Life History of the Spotted Turtle Clemmys Guttata microform a Southern Perspective written by Litzgus, Jacqueline D. (Jacqueline Danielle) and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 2003 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Diversity in Spotted Turtle Populations written by Patricia P. Rabenold and published by . This book was released on 1991 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on the Status of the Spotted Turtle Clemmys Guttata in Canada written by Canada. Committee on the Status of Endangered Wildlife in Canada and published by . This book was released on 1991 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Structure of Green Sea Turtle Chelonia Mydas Foraging Aggregations on the East Coast of Florida written by Monica R. Reusche and published by . This book was released on 2020 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The genetic structure of juvenile green turtles (Chelonia mydas) foraging on the east coast of central Florida is not well understood, nor has it been examined over time. In the last three decades, the dramatic increase in the number of green sea turtle nests in Florida, in association with other population parameters, has led to this species being down-listed under the Endangered Species Act from “endangered” to “threatened” in the northwest Atlantic. However, it was unclear if the exponential growth in Florida nest numbers had any influence on the genetic structure of juveniles in nearby foraging aggregations. To understand this potential impact mixed-stock analysis was conducted using mitochondrial DNA fragments that were over 800 base pairs long on samples taken from juveniles captured from 2002-2005 and 2016-2018 in the central Indian River Lagoon and Trident Submarine Basin in Port Canaveral. Results indicate the sampled foraging sites are genetically distinct habitats. In both sites, recruitment from Florida nesting beaches remained low despite increases in nesting while contributions from rookeries in Costa Rica and Mexico dominated both foraging aggregations across time. Haplotype diversity and nucleotide diversity decreased at both foraging sites over time. The foraging sites shared the two most frequently occurring haplotypes, but also had haplotypes that were unique to the site or sample period. Our results highlight the need for broader sampling of rookeries and foraging aggregations to understand the impacts of nesting increases in one rookery on juvenile diversity. Future studies should include all life stages of green turtles to enhance understanding of both the census population and effective population to better inform conservation policies necessary for a continued recovery.
Download or read book Genetic Analysis of the Kemp s Ridley Sea Turtle Lepidochelys Kempii and Estimates of Effective Population Size written by Sarah Holland Stephens and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The critically endangered Kemp's ridley sea turtle experienced a dramatic decline in population size (demographic bottleneck) between 1947 and 1987 from 160,000 mature individuals to less than 5000. Demographic bottlenecks can cause genetic bottlenecks where significant losses of genetic diversity occur through genetic drift. The loss of genetic diversity can lower fitness through the random loss of adaptive alleles and through an increase in the expression of deleterious alleles. Molecular genetic studies on endangered species require collecting tissue using non-invasive or minimally invasive techniques. Such sampling techniques are well developed for birds and mammals, but not for sea turtles. The first objective was to explore the relative success of several minimally invasive tissue-sampling methods as source of DNA from Kemp's ridley sea turtles. Tissue sampling techniques included; blood, cheek swabs, cloacal swabs, carapace scrapings, and a minimally invasive tissue biopsy of the hind flipper. Single copy nuclear DNA loci were PCR amplified with turtle-specific primers. Blood tissue provided the best DNA extractions. Additionally, archival plasma samples are shown to be good sources of DNA. However, when dealing with hatchlings or very small individuals in field situations, the tissue biopsy of the hind flipper is the preferred method. This study's main focus was to evaluate whether the Kemp's ridley sea turtle sustained a measurable loss of genetic variation resulting from the demographic bottleneck. To achieve this goal, three alternative approaches were used to detect a reduction in Kemp's ridley's effective population size (Ne) from microsatellite data. These approaches were 1) Temporal change in allele frequencies, 2) An excess of heterozygotes in progeny, and 3) A mean ratio (M) of the number of alleles (k) to the range of allele size (r). DNA samples were obtained from Kemp's ridleys caught in the wild. PCR was used to amplify eight microsatellite loci and allele frequencies were determined. Data from only four microsatellites could be used. Although the reduced number of loci was a limiting factor in this study, the results of all three approaches suggest that Kemp's ridley sustained a measurable loss of genetic variation due to the demographic bottleneck.
Download or read book Population Genetic Structure and Male Reproductive Success of a Blanding s Turtle Emydoidea Blandingii Population in Southeastern Michigan written by Matthew F. Osentoski and published by . This book was released on 2001 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
