Dissertations / Theses on the topic 'Freshwater turtle'
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Judge, David, and n/a. "The Ecology of the polytopic freshwater turtle species, Emydura macquarii macquarii." University of Canberra. Resource, Environmental and Heritage Sciences, 2001. http://erl.canberra.edu.au./public/adt-AUC20050418.151350.
Full textau, turtle111@aapt net, and Jacqueline Giles. "The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga." Murdoch University, 2005. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20061121.103729.
Full textGiles, Jacqueline. "The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga." Thesis, Giles, Jacqueline (2005) The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga. PhD thesis, Murdoch University, 2005. https://researchrepository.murdoch.edu.au/id/eprint/39/.
Full textGiles, Jacqueline. "The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga." Giles, Jacqueline (2005) The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga. PhD thesis, Murdoch University, 2005. http://researchrepository.murdoch.edu.au/39/.
Full textBrowne, Carol. "Impacts of urbanisation and metal pollution on freshwater turtles." University of Sydney, 2005. http://hdl.handle.net/2123/4009.
Full textOver 85% of Australia’s population live in urban areas and many turtle populations occur on Australia’s east coast where urban development is particularly concentrated. In the state of NSW, over half of the freshwater coastal wetlands have been highly modified or completely destroyed, and urban freshwater creeks often have only a narrow strip of weedy bushland left along their banks. Even though habitat degradation may result in declines in density and distribution of turtle populations, there are few data on Australian freshwater turtles in urban areas. In addition to extreme habitat alteration, urban waterways are innundated with anthropogenic contaminants from sources including wet weather surface runoff and industrial and sewage discharges. Pollutants can impact all systems of the body with potentially severe effects on reproduction and survival that can result in deterioration of animal populations. Turtles are particularly susceptible to anthropogenic contaminants due to their intimate contact with the aquatic environment, an often high trophic level, their ability to accumulate toxins, and their longevity. For almost all contaminants, the degree of accumulation in and effect on reptile species is unknown. Sublethal effects in field situations are particularly poorly studied and have never been documented in pleurodiran turtles. As a pioneering work in Australian reptile ecotoxicology, this thesis takes a broad approach, but focuses primarily on immunotoxicity and reproductive toxicity – two areas that greatly impact the size and continuance of animal populations. The aim of the thesis is to provide baseline data on haematology, cellular immunology and tissue metal concentrations for freshwater turtles in Sydney – data which were lacking for all Australian turtle species prior to this study. After initial assessment of the distribution and density of freshwater turtles in Sydney, the study examines the potential for Sydney’s turtles as sentinel species for measuring the effects of pollution on haematology, cellular immunity, and parasite loads; and considers the relationships between urban metal pollution and reproductive variables. The relative suitability of non-lethally sampled tissues (blood, carapace, egg) for use in biomonitoring is also assessed. Three species of Australian freshwater turtles were found in the Sydney region, with Chelodina longicollis occurring naturally in the area, and populations of Emydura macquarii and Elseya latisternum likely to have originated from translocated individuals. The North American turtle Trachemys scripta elegans was not encountered during this study despite concerns that it was establishing in the Sydney area. Chelodina longicollis populations were widespread, although poor recruitmment was indicated by low capture rates and comparatively low percentage of juveniles at some sites. Not so widespread, Emydura macquarii was present in much larger numbers than C. longicollis and with a high juvenile component in some areas of southeastern Sydney. I provide information on erythrocyte and leucocyte parameters in C. longicollis over a range of sites, pollution conditions, and seasons. In C. longicollis, numbers of lymphocytes, heterophils and eosinophils varied over sites, but not due to pollution from sewage treatment plant outfalls. There was significant temporal variation in erythrocyte, lymphocyte, eosinophil, heterophil, and basophil number, the heterophil:lymphocyte ratio, and haematocrit, but not consistently among sites. Future studies should ensure simultaneous sampling across sites for comparative purposes. Similarly, turtle populations downstream of sewage treatment plant outfalls showed no consistent difference in number, body condition, blood haemogregarine load, or leech (haemogregarine vector) load from upstream populations. Leech (Helobdella papillornata, with some Placobdella sp.) load and haemogregarine numbers increase dramatically once C. longicollis reach a carapace of 110 mm. The number of leeches on turtles varied across season, year, and site. Turtles with large numbers of leeches had reduced haematocrit, but the presence of leeches had no other correlations with haematological parameters. Haemogregarine numbers did not change across season or year, and were not correlated with haematological variables. The hypothesis that pollutants lead to an increase in normal blood protozoa due to reduced immunity thus was not supported. The concentration of metals in C. longicollis and E. macquarii carapace and in lagoon sediments varied significantly over four urban and four national park sites, but not based on this split. Pollution in periurban areas, such as illegal dumping of toxic wastes and atmospheric deposition of pollutants, means that each site must be classified separately as to degree of metal pollution. There was little or no affect of species, size, sex, or gravidity on metal concentrations in the carapace of adult turtles. Emydura macquarii had higher concentrations of blood Fe than C. longicollis from a different site, but this is possibly due to an increase in haemoglobin resulting from the site’s low aquatic oxygen concentration rather than any increased environmental exposure. Chelid turtles in Sydney do not show much promise as a biomonitoring tool. Carapace analysis is largely discounted as a potential tool for metal biomonitoring due to poor correlations between potentially toxic metals in non-lethally samplable tissues (carapace, claw) and internal organs (liver, kidney) or bone (femur). However, carapace metal concentrations still potentially reflect long-term metal presence or different dietary exposures as evidenced by the significant variation in concentrations over sites. A rare correlation was found for concentrations of aquatic Pb and carapace Pb, and a correlation was also found for concentrations of blood Pb and carapace Pb in E. macquarii. Thus any potential for tissue biomonitoring seems to lie with this highly ecotoxicologically relevant metal. Although two other ecotoxicologically relevent metals, Cu and Se, were significantly higher in egg contents of C. longicollis compared to E. macquarii, these elements are also essential and a lack of baseline values means it is not known if this simply reflects natural taxonomic variation. Ni, a metal of toxicological concern in sea turtles, was not present in egg contents, and only variably present in eggshell. The absence of Pb from eggs, despite its presence in many maternal tissues, suggests that selective metal uptake into eggs may be protective of toxic elements, rather than eggs serving as a maternal method of toxic metal elimination as has been previously suggested. The paucity of toxic metal detection in eggs renders them unlikely tissues for biomonitoring. The maternal tissue or tissues or environmental source from which egg metals originate remains obscure, although a significant negative effect of maternal carapace concentrations of Ca and Mg on eggshell thickness in E. macquarii indicates that there may be mobilisation of Ca and Mg from the carapace for eggshell formation. The only metal whose eggshell concentration correlated with eggshell thickness was Mg, indicating that ecotoxic metals previously associated with eggshell thinning are not problematic in the Sydney chelids. As with North American turtles living at polluted sites, none of the chelid hatchlings were found to have any overt abnormalities. Hatching success was poor and hatching mass low for eggs of both C. longicollis and E. macquarii, although results from natural nests are required to determine whether or not this was an outcome of hormonally-induced oviposition and artificial incubation. It is difficult to interpret metal concentrations found in the soft tissues, calcified tissues, and eggs of chelonians due to the paucity of comparative data, and much more research is required on tissue metal concentrations before patterns will emerge. This especially applies to pleurodires for which no previous information is available. From comparisons with the limited data available for other freshwater turtles, marine turtles, and other aquatic reptiles, it does not appear that Sydney’s turtle populations have unusually high metal concentrations in tissues. Exclusion of toxic metals such as Pb from the egg may also be protective to the developing embryo. An ability to live in polluted habitats, while limiting the accumulation of toxic contaminants, may be one key to their persistence in urban waterways from which other freshwater fauna have disappeared. Reproductive impacts such as low embryo survival and small hatchling weights require more rigorous examination, but may have less effect on these animals which have such naturally high egg and hatchling mortality. Although it was generally hard to demonstrate biochemical, physiological or population impacts of contaminants, C. longicollis from a site with severe sewage pollution did display unusual alterations in a number of haematological variables, body condition, and carapace bone structure. Despite this, the population was large and had a comparatively high ratio of juveniles. Additionally, the adverse haematological alterations appeared reversible. Thus, successful populations in Sydney probably are more dependent on basic ecological needs being met, than on low levels of environmental contaminants. The ongoing persistence of chelid populations in Sydney is likely to be dependent to some extent on their opportunistic diets, which generally make animals less vulnerable to habitat modification and the reduction in prey item diversity following pollution (Mason 1996, Allanson & Georges 1999), with a further benefit possibly bestowed at some sites on E. macquarii by its omnivory.
Roe, John H., and n/a. "THE TERRESTRIAL ECOLOGY OF A FRESHWATER TURTLE, CHELODINA LONGICOLLIS, IN BOODEREE NATIONAL PARK, AUSTRALIA." University of Canberra. Institute for Applied Ecology, 2007. http://erl.canberra.edu.au./public/adt-AUC20081009.143208.
Full textStecyk, Jonathan Anthony William. "Control of cardiovascular function during prolonged anoxia exposure in the freshwater turtle (Trachemys scripta)." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31162.
Full textScience, Faculty of
Zoology, Department of
Graduate
Cloninger, Partick Lee. "The ecology of freshwater turtle communities on the Upper-Coastal Plain of South Carolina." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1193080163/.
Full textHill, Shannon K. Vodopich Darrell S. "The influence of urbanization on the basking behavior of a Central Texas freshwater turtle community." Waco, Tex. : Baylor University, 2008. http://hdl.handle.net/2104/5245.
Full textWillmore, William Glen. "Molecular adaptation to anoxia and recovery from anoxia in the freshwater turtle Trachemys scripta elegans." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq26874.pdf.
Full textTrembath, 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.
Full textThompson, Molly Marie. "Individual and Interactive Impacts of Mercury and Agriculture on Reproduction in a Freshwater Turtle, Chelydra serpentina." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78262.
Full textMaster of Science
Spencer, Ricky-John. "The Murray River Turtle, Emydura macquarii: Population Dynamics, Nesting Ecology and Impact of the Introduced Red Fox, Vulpes vulpes." University of Sydney. Biological Sciences, 2001. http://hdl.handle.net/2123/373.
Full textRuhl, Nathan A. "The Lotic-Lentic Gradient in Reservoirs and Estuaries." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1339177201.
Full textAttia, El Hili Rahma. "Biogéographie de deux espèces de tortues d'eau douce ( Emys orbicularis et Mauremys leprosa) en Tunisie, diversité génétique des hémoparasites et risque d'introduction parasitaire." Thesis, Perpignan, 2020. http://www.theses.fr/2020PERP0015.
Full textThe objective of this study is to update data on distribution and genetic variation of t two species of freshwater turtles Mauremys leprosa and Emys orbicularis in Tunisia and to assess their vulnerability. It also aims to determine the diversity and to evaluate the specificity of the hemogregarins (Protozoa: Apicomplexa: Haemogregarinidae) based on morphological and molecular analyzes. The Mediterranean pond turtle is currently not threatened in Tunisia unlike the European pond turtle which is in critical situation. Morphological and molecular analyzes of blood parasites have reveald the presence of co-infection in the same turtle specimen. The molecular aspect concerned the characterization and identification of species belonging to the same genus Haemogregarina through the use of mitochondrial and nuclear markers. Thus we were able to compare the level of genetic information of the two markers and to demonstrat that the mitochondrial COI genes identified more variability than those found with the 18S rRNA gene. In addition, the low specificity of these blood parasites towards the final and intermediate host species has been shown to be a factor which increases the risk of transmission of hemogregarins from an exotic host species to a native host species
Costa, Shirley Famelli da. "Ecologia reprodutiva e análise de viabilidade de uma população do cágado Hydromedusa maximiliani (Testudines, Chelidae) no Parque Estadual Carlos Botelho." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-26062009-150529/.
Full textThe reproductive strategies of Hydromedusa maximiliani at the Carlos Botelho State Park, SP, was verified by X-ray in females and juveniles between September 2007 and December 2008. Throughout the study two reproductive seasons were detected, both beginning in September. From a total of 33 X-rayed females, only 19 showed eggs, and three of them showed eggs in the two reproductive seasons. Clutch size varied from 1 to 3 eggs, but only one female presented one egg and another female presented three eggs. Clutch volume was 22128.01 ± 4939.8 mm³ (10493.422136.12 mm³; N = 44). Female body size was positively correlated to clutch volume, a pattern usually detected in chelonians. Reproductive information acquired in the present study together with population data available for H. maximiliani in the study site makes it possible a population viability analysis using the software VORTEX (version 9.92). A principal scenario (Real Population) was created based on life-history data collected throughout 10 years. In order to compare the protected area with an unprotected hypothetical area regarding the persistence of the population, this scenario was modified by altering some variables (10% increasing of mortality rate, 10% increasing of inbreeding depression, decreasing of carrying capacity), which generates a scenario named Hypothetical Isolated Population. Results were compared and sensitivity tests were carried out to verify the influence of variation in mortality ratio, catastrophes and inbreeding depression. There was a significant difference between the two scenarios (p = 0.0005). The extinction risk was 31% for Real Population and 90% for Hypothetical Isolated Population. The sensitivity analysis indicated that mortality ratio, deforestation, forest fires and inbreeding depression strongly influence the population survival. Long-term studies and biological information on species inhabiting areas subjected to anthropogenic impacts, like the Atlantic Rainforest, are vital to conservation actions, since they make it possible population viability analyses and the design of management strategies to threatened populations.
Browne, Carol Lindsay. "Impacts of urbanisation and metal pollution on freshwater turtles." Connect to full text, 2004. http://hdl.handle.net/2123/4009.
Full textTitle from title screen (viewed 13 January 2009) Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Biological Sciences, Faculty of Science. Includes bibliographical references. Also issued in print.
Spinks, Phillip Quinton. "Molecular phylogenetics and conservation of freshwater turtles /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Full textSmith, Elizabeth T. Biological Earth & Environmental Sciences Faculty of Science UNSW. "Terrestrial and freshwater turtles of early cretaceous Australia." Awarded By:University of New South Wales. Biological, Earth & Environmental Sciences, 2009. http://handle.unsw.edu.au/1959.4/43808.
Full textBell, Barbara Allen Spotila James R. "Effects of crude oil contamination on the reproduction of freshwater turtles /." Philadelphia, Pa. : Drexel University, 2005. http://dspace.library.drexel.edu/handle/1860/479.
Full textAtkinson, Benjamin K. "Community ecology of creek-dwelling freshwater turtles at Nokuse Plantation, Florida." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0025093.
Full textRivera, Gabriel. "Hydrodynamics of freshwater turtles maneuverability, stability, and effects of shell shape /." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1263402335/.
Full textMcCosker, Julia. "Reproductive ecology of the Australian freshwater turtles : Emydura macquarii signata and Chelodina expansa /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17832.pdf.
Full textCheung, Sze-man. "Ecology, conservation and trade of freshwater turtles in Hong Kong and Southern China, with particular reference to the critically endangered Cuora trifasciata /." View the Table of Contents & Abstract, 2007. http://sunzi.lib.hku.hk/hkuto/B38724790.
Full textHrycyshyn, Gabrielle Elaine. "Survival probabilities and density of four sympatric species of freshwater turtles in Florida." [Gainesville, Fla.] : University of Florida, 2007. http://purl.fcla.edu/fcla/etd/UFE0021036.
Full textCheung, Sze-man, and 張思敏. "Ecology, conservation and trade of freshwater turtles in Hong Kong andSouthern China, with particular reference to the critically endangeredCuora trifasciata." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B45015739.
Full textRodrigues, JoÃo FabrÃcio Mota. "How the freshwater turtles survive and reproduce in caatinga? - Life history traits of Phrynops tuberosus (Testudines: Chelidae)." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9486.
Full textA teoria de histÃria de vida estuda as combinaÃÃes de caracterÃsticas que maximizam a reproduÃÃo e a sobrevivÃncia dos organismos no ambiente onde vivem. As espÃcies utilizam o ambiente de modo diverso, e esse uso depende das condiÃÃes existentes nos hÃbitats disponÃveis. Phrynops tuberosus, cÃgado encontrado nas regiÃes norte-nordeste do Brasil, Ã o animal-modelo escolhido para o estudo dos traÃos de histÃria de vida e de uso de hÃbitat. Esse trabalho objetiva entender como a espÃcie se reproduz, organiza-se e utiliza o hÃbitat na caatinga. O estudo gerou conhecimentos biolÃgicos e ecolÃgicos da espÃcie e permitiu o teste de hipÃteses e previsÃes sobre traÃos de histÃria de vida, dimorfismo sexual e uso de hÃbitat. SeleÃÃo de locais de desova, machos menores que fÃmeas e preferÃncia de animais maiores por ambientes mais expostos foram encontradas nas populaÃÃes estudadas. Os resultados encontrados facilitam a compreensÃo da reproduÃÃo e da sobrevivÃncia dos quelÃnios em um ambiente do semiÃrido.
Serrano, Filipe Alexandre Cabreirinha. "Spatial ecology of a freshwater turtle in a temporary pond complex." Master's thesis, 2014. http://hdl.handle.net/10174/15909.
Full textChih-Ling, Chen, and 陳知麟. "The Effect of Diet Compositions on the Digestibility of Crude Fiber and Total Nitrogen of the Omnivorous Freshwater Turtle." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/47831731583193110539.
Full text國立屏東科技大學
野生動物保育研究所
93
Ocadia sinensis is the most common turtle in Taiwan. According to the field research, it was omnivorous. The diet habit, size and growing rate were different between sexes. With the increasing of the carapace, females ingested more plants. And as they grew, the growing rate of females was higher than that of males, the size of females would be larger than that of males significantly, too. The purpose of this study is to experiment the effect of different diet compositions to O. sinensis by captivity raised. We want to know if the digestive perform will affect their diet habit and growth. At first, we kept turtles in pool individually, fed them three kinds of diets: plant, animal, both plant and animal (mix), respectively, and then collected their feces. We counted the digestibility of crude fiber and total nitrogen of these turtles. The digestibility of crude fiber and total nitrogen of males had no significant differences among the three diets, but there was significant difference between that for females. The digestibility of crude fiber and total nitrogen had no significant difference between males and females.
Pamenter, Matthew. "Mechanisms of Channel Arrest and Spike Arrest Underlying Metabolic Depression and the Remarkable Anoxia-tolerance of the Freshwater Western Painted Turtle (Chrysemys picta bellii)." Thesis, 2008. http://hdl.handle.net/1807/17253.
Full textDavy, Christina M. "Conservation Genetics of Freshwater Turtles." Thesis, 2013. http://hdl.handle.net/1807/35174.
Full textTsaliagos, Ria Nicole. "Examining indeterminate growth in freshwater turtles." 2002. http://purl.galileo.usg.edu/uga%5Fetd/tsaliagos%5Fria%5Fn%5F200212%5Fms.
Full textWirth, Wytamma. "Ranaviral infection in Australian freshwater turtles." Thesis, 2020. https://researchonline.jcu.edu.au/68267/1/JCU_68267_Wirth_2020_thesis.pdf.
Full textPaulson, David J. "Evaluating the Effectiveness of Road Passage Structures for Freshwater Turtles in Massachusetts." 2010. https://scholarworks.umass.edu/theses/384.
Full textYorks, Derek T. "Experimental Tests of Road Passage Systems for Reducing Road Mortalities of Freshwater Turtles." 2015. https://scholarworks.umass.edu/masters_theses_2/176.
Full textWilkinson, Lucas Rand. "Patterns of reproductive allocation clutch and egg size variation in three freshwater turtles /." 2003. http://purl.galileo.usg.edu/uga%5Fetd/wilkinson%5Flucas%5Fr%5F200312%5Fms.
Full textBouchard, Cindy. "La génétique au service de la conservation de la tortue des bois (Glyptemys insculpta)." Thesis, 2020. http://hdl.handle.net/1866/25265.
Full textConservation biology is a rapidly expanding field of research due to the accelerating loss of global biodiversity. To better understand the processes and threats to the persistence of small populations and the effects of anthropogenic factors on biodiversity, genetic approaches are frequently used in conservation. Genetic analyzes can, for example, inform us about long-term trends, population diversity and reproductive strategies of a species. The wood turtle (Glyptemys insculpta) is a species endemic to North America that is endangered according to the International Union for the Conservation of Nature. As part of my thesis, my objective was to characterize the genetic diversity of this threatened species in Canada. In order to better understand the impact of reproductive strategy and landscape structure on population diversity, I analyzed the genetics of wood turtle populations at several spatial and temporal scales. First, parentage relationships were reconstructed in a population of wood turtles to estimate the frequency of multiple and repeated paternity. The results of my work suggest that sperm storage in females and multiple reproduction with the same partners for more than one breeding season could explain these phenomena. These reproduction strategies could in this case be induced by the low density of the study population, or by fidelity to the overwintering site where the majority of copulation events take place. Subsequently, I assessed the genetic diversity of wood turtle populations. I wanted to understand the effects of the landscape configuration and geographic dispersion events on the diversity of populations. Using a landscape genetics approach, my analyzes show that the division of populations by watershed explains a large fraction of the genetic diversity between populations. These results also confirm that watersheds represent management units conducive to the protection of wood turtle populations. Finally, network analysis was used to better understand the gene flow dynamics among populations located on the north and south shores of the St. Lawrence River. More specifically, the north shore is characterized by a robust network of isolated populations, whereas the populations on the south shore present more of a metapopulation structure. Using population graphs, hypothetical scenarios were compared to explore the node selection process using the BRIDES algorithm. The results of these analyzes made it possible to point out specific populations of wood turtles, considering their importance for network connectivity. This could have not been predicted by using genetic diversity and distinctiveness estimates, node-based metrics, and node removal analysis for these populations. Thanks to genetics, this thesis brings new knowledge on the wood turtle, the reproductive strategies of both sexes, the gene flow, the connectivity and the influence of the hydrographic network on population diversity. These results allow us to have a better understanding of the processes affecting the genetic diversity of this species in order to better protect it. All analyses performed for this thesis are directly applicable to other long-lived species with overlapping generations.