Spatial Ecology and Conservation of the Central American River Turtle (Dermatemys Mawii) PDF Download
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Author: Elyse D. Ellsworth
Publisher:
ISBN:
Category : Biogeography
Languages : en
Pages : 60
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Author: Elyse D. Ellsworth
Publisher:
ISBN:
Category : Biogeography
Languages : en
Pages : 60
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Author: Don Moll
Publisher: Oxford University Press
ISBN: 9780195102291
Category : Mathematics
Languages : en
Pages : 420
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Book Description
The underlying theme of this book is that a widespread, taxonomically diverse group of animals, important both from ecological and human resource perspectives, remains poorly understood and in delcine, while receiving scant attention from the ecological and conservation community. This volume proposes a comprehensive overview of the world's river turtles' ecology, conservation, and management. It begins with a categorization of taxa which inhabit flowing water habitats followed by information on their evolutionary and physical diversity and biogeography. Within the framework of ecology, the authors discuss the composition of river turtle communities in different types of lotic habitats and regions, population dynamics, movements, reproductive characteristics and behavior, predators, and feeding relationships. In a conservation and management section, the authors identify and evaluate the nature and intensity of factors which threaten river turtle survival--almost all of which involve direct human exploitation or indirect effects of human induced habitat alteration and degradation. They then list and evaluate the various schemes which have been proposed or employed to halt declines and restore populations, and make recommendations for future management plans for specific species and regions. In closing, they state their viewpoint concerning future research directions and priorities, and an evaluation of future prospects for survival of the world's river turtle species.
Author: John R. Polisar
Publisher:
ISBN:
Category : Turtles
Languages : en
Pages : 358
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Author: Raymond A. Saumure
Publisher:
ISBN:
Category : Wood turtle
Languages : en
Pages : 266
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Book Description
"The impact of agricultural practices on wood turtle (Glyptemys insculpta) movements and survivorship was investigated in a fragmented agri-forest landscape over two years. Agricultural activities and machinery contributed to the death of 20% of radio-tracked turtles. Annual survivorship of adults was 0.904 and 0.868 and for juveniles it was 0.815 and 0.831 for 1998 and 1999, respectively. Mutilation rates in adults were 90% +/- 3% in both years; in contrast, the maximum rate in juveniles was 57%. Setting the cutting height of disc mowers to 100 mm would increase harvest yields, reduce wear on machinery, decrease soil erosion, and reduce turtle mortality and mutilation rates. The concepts of integral, statistical, and linear range are introduced as distinct estimators of turtle movements. Since integral ranges include all habitats critical to survival, they provide an important contribution to our knowledge of imperiled species. Statistical ranges are stable and easily promote within and between study comparisons. Linear ranges quantify migratory and ranging movements. Thread-trailing techniques were used to record the fine-scale movements of six adult male G. insculpta translocated to an experimental hayfield patch-matrix. Although patch size had no effect on move length or path sinuosity, habitat structure did. Paths were generally straighter and move length longer in the harvested portion of a hayfield. Apparent habitat boundaries were shown to be permeable. Subjects exhibit three movement phases: agitation dispersal, local search, and ranging. Thus, G. insculpta exhibit predetermined movement patterns and move to maximize the likelihood of locating resources, while minimizing the probability of revisiting previously searched areas. Recent changes in agricultural practices and machinery are having a decidedly negative impact on G. insculpta. This study provides new insights into the movements of G. insculpta. Such knowledge will be an es" --
Author: Lucas Griffin
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Considering many sea turtle populations are a fraction of their historic size and anthropogenic threats within the marine environment are increasing, additional data are imperative to help mitigate anthropogenic disturbances and to build resilience into sea turtle populations. In this dissertation, I present three data chapters focused on immature sea turtle ecology and conservation. These chapters evaluate sea turtle ecology and conservation at varying scales, ranging from mitigating human-wildlife interactions at the individual level, to coastal movements and space use at the ecosystem level, and to large scale climate change impacts at the population level. Ultimately, these chapters provide a better understanding of immature turtle behavioral and spatial ecology within nearshore waters that are required for the continued conservation of turtles and their habitats. In Chapter 2, following Chapter 1: General Introduction, I quantified the behavioral response of immature green turtles (Chelonia mydas) to disturbance by snorkelers in a popular ecotourism venture on Culebra Island, Puerto Rico, United States. Using a standardized disturbance stimulus, I evaluated whether turtles have individual-level responses to snorkeler disturbance. I found ninety percent of turtles disturbed by snorkelers initiated their fights at distances of 3 m or less. Thus, I recommended snorkelers remain greater than 3 m distance from immature turtles. In addition, I found a significant intra-individual repeatability in behavioral responses to disturbance, suggesting, ecotourism activities may be disproportionally affecting individual turtles depending on their personality type. Finally, I suggest ecotourism activities be temporally and spatially stratified and better regulated to reduce missed foraging opportunities by immature turtles in important foraging areas. In Chapter 3, I used acoustic telemetry to describe movement patterns and connectivity of immature green turtles on Culebra and Culebrita Islands, Puerto Rico and, secondly, to determine the spatial-temporal drivers of presence and absence of turtles. Network analysis revealed high fidelity within bays with little to no connectivity across the islands. Based on these findings, I provided evidence that habitat quality and availability in combination with predation risk (innate or learned) is likely driving different rates of somatic growth across the island. Using a presence-absence Bayesian model, results indicated turtles occupied areas of lagoon and seagrass habitats at night, and were rarely using areas of macroalgae habitat. The parameter estimates from the model enabled me to predict diel movement patterns and space use across the focal bay. While habitatswithin Culebraare still largely intact, coastal embayments are becoming increasingly threatened. Given that my research showed that turtles in Culebra exhibit high fidelity within the bays, it is imperative to protect these distinct habitats that serve as both shelter and foraging areas. In Chapter 4, I examined the oceanic, atmospheric, and biological factors that may affect the increasing trend of cold-stunned immature Kemp's ridleys (Lepidochelys kempii) in Cape Cod Bay, Massachusetts, United States. Using cold-stunned data collected since the early 1980's and analytical methods, such as machine learning algorithms and Bayesian modeling, I demonstrated higher cold-stunning years occurred when the Gulf of Maine has warmer seas surface temperature (SST) in late October through early-November. Hatchling numbers, a proxy for population abundance, was not identified as an important factor in predicting the number of annual cold-stunning strandings. Further, I predicted the potential annual cold-stunning counts out to 2031 based on the increasing Gulf of Maine SSTs and evaluated the population level effects of future cold-stunning events in the face of climate change. While cold-stunning at the population level may be minimal, I recommend the continued efforts to rehabilitate cold-stunned turtles to maintain population resilience for this critically endangered species. For the fifth, and final chapter, I synthesized these findings in the context of contributions to the greater field of sea turtle conservation and management, propose future research directions, and re-visit caveats of these studies. Within this chapter, each data chapter is revisited to provide direct conservation applications to help mitigate anthropogenic disturbances. In Chapter 2, I suggest alternate ecotourism regulations and advocate for the spatial-temporal stratification of green turtle snorkel tours. In Chapter 3, I highlight the differential space use of green turtles within coastal habitats and advocate for the importance and protection of these habitats to ensure recruitment into adult populations. And finally, in Chapter 4, I advise for the recovery and rehabilitation of cold-stunned Kemp's ridley turtles to provide population resilience for this critically endangered species in a changing world.
Author: Takahiro Shimada
Publisher:
ISBN:
Category : Green turtle
Languages : en
Pages : 164
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Author: Michael T. Jones
Publisher:
ISBN:
Category : Animal populations
Languages : en
Pages : 243
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Author:
Publisher:
ISBN:
Category : Wildlife conservation
Languages : en
Pages : 762
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Author: John Legler
Publisher: Univ of California Press
ISBN: 0520956893
Category : Science
Languages : en
Pages : 415
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Book Description
The Turtles of Mexico is the first comprehensive guide to the biology, ecology, evolution, and distribution of more than fifty freshwater and terrestrial turtle taxa found in Mexico. Legler and Vogt draw on more than fifty years of fieldwork to elucidate the natural history of these species. The volume includes an extensive introduction to turtle anatomy, taxonomy, phylogeny, biogeography, and physiology. A key to the turtles of Mexico is included along with individual species accounts featuring geographic distribution maps and detailed color illustrations. Specific topics discussed for each species include habitat, diet, feeding behavior, reproduction, predators, parasites, growth and ontogeny, sexual dimorphism, growth rings, economic use, conservation, legal protection, and taxonomic studies. This book is a complete reference for scientists, conservationists, and professional and amateur enthusiasts who wish to study Mexican turtles.
Author: Lisa Marie Lehnhoff
Publisher:
ISBN:
Category : Emydidae
Languages : en
Pages : 114
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Book Description
