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Showing 1 to 20 of 37 for “"Sea turtles"”.
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Migratory Ecology of Sea Turtles
… especially true for migratory species, such as sea turtles, whose long-distance movements form a major component of their life history. In this thesis, I investigated which factors are driving the migratory behavior of the leatherback turtle<em>Dermochelys coriacea. </em>Firstly, I examined …
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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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Bycatch and foraging ecology of sea turtles in the Eastern Pacific
<p>Sea turtles are long lived marine species that are currently endangered because their life history and population dynamics hinder them from withstanding modern anthropogenic threats. Worldwide, fisheries bycatch in on the major threats to the survival of sea turtles and that is also the case in …
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Reproductive Ecology and Hatchling Behavior of Olive Ridley Sea Turtles in Honduras
… of the olive ridley (Lepidochelys olivacea) sea turtle population nesting in Pacific Honduras. I begin by reviewing olive ridley reproduction, human use of this species, and past and present conservation on nesting beaches. I also propose a conservation strategy to improve nesting beach …
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Reproductive success of sea turtles nesting on Wabasso Beach, East-Central Florida
… of 1988 and 1989, nests of 528 loggerhead sea turtles (Caretta caretta), 27 green sea turtles (Chelonia mydas), and 1 leatherback sea turtle (Dermochelys coriacea) were monitored on Wabasso Beach in Indian River County, Florida. Two hundred and forty four of the loggerhead and 2 of the …
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Recreational Diving and Hawksbill Sea Turtles (Eretmochelys imbricata) in a Marine Protected Area
… the effects of recreational diving on sea turtles. I conducted in-water observations and turtle sightings surveys from June 9 to August 21, 2014, in Roatán, Honduras, to determine if differences in dive site use and diver behavior alter the behavior of critically endangered hawksbill …
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Development and application of a multistate model to the northern subpopulation of loggerhead sea turtles
Loggerhead sea turtles (Caretta caretta) are listed as threatened under the Endangered Species Act and are protected both on nesting beaches and in United States waters. Loggerhead sea turtles are long-lived species and are most easily studied on the beaches during the nesting season. Bald Head …
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Incubators for Species which Exhibit Temperature-Dependent Sex Determination: Application to Hawksbill Sea Turtles in Rising Ambient Temperatures
… 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 …
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I love Turtles! A Visual art practice-based exploration of the emergent endangered sea turtles of the KwaZulu-Natal Coast
Submitted in fulfillment of the requirements of the Degree of Doctor of Philosophy in Visual and Performing Arts, Durban University of Technology, Durban, South Africa, 2024.
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Determining Critical Internesting and Foraging Habitats for the Conservation of Sea Turtles in Gabon, Africa Using Satellite Tracking and Stable Isotope Analysis
… horizontal and vertical habitat of olive ridley sea turtles (Lepidochelys olivacea), a threatened species, is critical for determining regions of protection that may effectively reduce bycatch, the largest threat to this species. Satellite transmitters were used to determine the movement and dive …
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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
… the movements and behavior of hawksbi1l sea turtles is vital to their protection, but existing data on these subjects are insufficient. The objectives of this study were 1) to monitor internesting movements and surfacing behavior of hawksbill sea turtles nesting at Buck Island Reef …
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Nesting Behavior, Growth Rates, and Size Distribution of Loggerhead Sea Turtles (Caretta Caretta) on Blackbeard Island National Wildlife Refuge: An Evaluation of Recruitment In Georgia
An eight year study of loggerhead sea turtles (Caretta caretta) was conducted on Blackbeard Island National Wildlife Refuge (BLB NWR). A 3 month in-water survey also was conducted in 2008 along the coast of Georgia and Northern Florida. The nesting trends on BLB NWR were evaluated to provide …
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Sea turtle bycatch by the U.S. Atlantic pelagic longline fishery: A simulation modeling analysis of estimation methods
… fisheries most affecting federally protected sea turtles (Crowder and Myers 2001, Witherington et al 2009). Bycatch by fisheries is considered the main anthropogenic threat to sea turtles (NRC 1990). Accurate and precise bycatch estimates are imperative for sea turtle conservation and …
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Effects of Heavy Metal Pollution on the Loggerhead Sea Turtle
Historically, heavy metal research on sea turtles has been focused on deceased specimens, limiting the ability to determine if the concentrations of heavy metals affected the health of the individuals. More recently, the collection and analysis of blood samples from live turtles has enabled the …
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Variation in Egg Components: A Study of Maternal Investment and Resource Partitioning in the Nesting Loggerhead Sea Turtle; Estimating Genic Variation and Mapping Genetic Lineage of a Rare Captive Helodermatid Population: <em>Heloderma Horridum Charlesbogerti</em>
<p>Loggerhead sea turtles have the highest egg yields of any oviparous non-avian reptiles. Blood urea nitrogen levels increased as the season progressed while total blood albumen and total protein levels decreased. Wet egg mass (H = 1.7719 df = 2 p = 0.0375*) and albumen mass (H = 6.0507 df = 2 p = …
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Maternal Plasma and Corresponding Egg Yolk Hormone Variation within a Clutch and Across the Nesting Season of the Loggerhead Sea Turtle (Caretta Caretta)
… vary among species, within and among clutches, seasonally, due to age, and in response to social and environmental cues. In previous studies, significant effects on hatchling phenotype, sex and survival have been attributed to a variation in egg yolk hormone levels. The differential allocation …
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Revisão taxonômica e do registro fóssil de tartarugas marinhas não-Protostegidae do Cretáceo
Fossil records of sea turtles from Cretaceous are found mainly in the clade Pan- Chelonioidea, but it also refers to a few species without a definitive phylogenetic relationship, currently considered Eucryptodira Indeterminate. The oldest record of Pan-Chelonioidea dates from the Aptian (Early …
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