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Showing 1 to 10 of 10 for “"hawksbill"”.
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Molecular ecology of hawksbill turtles Eretmochelys imbricata in the Seychelles
… molecular genetic techniques to the study of the hawksbill sea turtle Eretmochelys imbricata, using a population in the Republic of Seychelles. My aim in this study was two-fold. Firstly, to better characterise certain key aspects of the hawksbill’s life history and demography, with a view to …
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Nesting Ecology of Hawksbill Sea Turtles (Eretmochelys imbricata) on Utila, Honduras
<p>The hawksbill sea turtle (<em>Eretmochelys imbricata</em>) has a circumtropical distribution and plays an important role in maintaining the health of coral reefs. Unfortunately, hawksbill populations have been decimated, and estimated numbers in the Caribbean are less than 10% of populations a …
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Recreational Diving and Hawksbill Sea Turtles (Eretmochelys imbricata) in a Marine Protected Area
… alter the behavior of critically endangered hawksbill sea turtles (Eretmochelys imbricata) in a marine protected area (MPA). I found that hawksbill sightings distributions within the RMP did not vary with recreational diving pressure during an 82-day study period suggesting that turtle …
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Integrating Research into Conservation: Using Satellite Telemetry and Population Monitoring to Inform the Management of Hawksbill Turtles in Brazil
… strategies. This dissertation focuses on the hawksbill turtle (Eretmochelys imbricata) in Brazil as a case study to enhance marine conservation efforts. Recognized as keystone species for their ecological significance and classified as Critically Endangered by the International Union for …
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Incubators for Species which Exhibit Temperature-Dependent Sex Determination: Application to Hawksbill Sea Turtles in Rising Ambient Temperatures
… like in the case of the critically endangered Hawksbill Sea Turtles (Eretmochelys imbricata). Reportedly, 85-95% of Hawksbills sampled in the wild are currently female [3]. This sex-imbalance can negatively impact the species’ ability to procreate, leading to the potential for extinction. …
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Internesting and post-nesting movement and behavior of Hawksbill sea turtles, Eretmochelys imbricata, at Buck Island Reef National Monument, St. Croix, USVI
… internesting movements and surfacing behavior of hawksbill sea turtles nesting at Buck Island Reef National Monument, St. Croix, and 2) to describe post-nesting movements of Buck Island hawksbills. Surfacing behavior and presence or absence of tagged turtles W(> :-t' monitored 24 hr a day by a …
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Bycatch and foraging ecology of sea turtles in the Eastern Pacific
… that these captures could have specially for hawksbill Eretmochelys imbricata due to its reduced population numbers and for green turtle Chelonia mydas due to its highest mortality rate. It also emphasizes the continuous lack of use of TEDs as a bycatch mitigation measure. In longline …
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Historical Responses Of Marine Turtles To Global Climate Change And Juvenile Loggerhead Recruitment In Florida
Marine turtle conservation is most successful when it is based on sound data incorporating life history, historical population stability, and gene flow among populations. This research attempts to provide that information through two studies. In chapter I, I identify historical patterns of gene …
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As global ambient temperatures continue to rise, with the highest recorded annual averages since 1850 being within the last ten years, problems emerge for species exhibiting temperature-dependent sex determination. This is the process by which the sex of an animal’s embryo is determined based on the temperature of environment in which it is incubated, which can result in skewed sex ratios within a population like in the case of the critically endangered Hawksbill Sea Turtles (Eretmochelys imbricata). Reportedly, 85-95% of Hawksbills sampled in the wild are currently female [3]. This sex-imbalance can negatively impact the species’ ability to procreate, leading to the potential for extinction. Currently, no viable, long-term solutions exist to effectively and safely cool sea turtle eggs while still keeping them within their natural habitat. This research proposes the creation of sea turtle egg incubators designed to achieve a temperature range that will produce a higher percentage of male hatchlings to help rectify this imbalance in habitats heavily affected by climate change. These incubators are designed to be affordable, easy to build and, most importantly, safe for the sea turtle eggs. Three-month-long temperature trials for the incubator were conducted in Jamaica with conservationist community partners at Oracabessa Bay Sea Turtle Project. Results showed that this incubator is not only easy to manufacture and use, but that it successfully regulates the temperature range in favor of more male hatchlings, while also increasing the emergence rate of the hatchlings from 70% in natural nests to over 80%. During one of the hottest months in Jamaica, the incubator, deployed without water changes, doubled the predicted percentage of males produced by natural nests. When provided with cool water changes the incubator quintupled this value. Throughout the months of August to October, the incubator achieved a temperature range that is predicted to produce 85-99% male hatchlings, thus counteracting the feminization phenomenon occurring in nature.
Foams, widely used in packaging, insulation, protective gear, and medical implants, are versatile materials but mechanically inefficient due to their bending-dominated microstructure, leading to an exponential loss of stiffness and strength at low relative densities. Architected materials address …