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Hawksbill Sea Turtle

Biology Project

Evelin Barajas

on 22 October 2012

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Transcript of Hawksbill Sea Turtle

Hawksbill Sea Turtle By: Evelin Barajas
Thornton-7th Period Eretmochelys imbricata Quick description; Hawksbill turtles A.K.A.; are unique sea turtles that live in many places during their whole life cycle. Hawksbill turtles are mostly found throughout the tropical waters of the Atlantic, Pacific, and Indian Oceans. They avoid deep waters, preferring coastlines and shallow waters where sponges are abundant and sandy nesting sites are within reach. Ecosystem: Sources: http://animaldiversity.ummz.umich.edu/accounts/Eretmochelys_imbricata/
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0038472 Hawksbills are normally found near reefs rich in the sponges. They are omnivorous and will also eat mollusks, marine algae, crustaceans, sea urchins, fish, and jellyfish. Their hard shells protect them from many predators, but they're still prey to large fish, sharks, crocodile, octopuses, and humans. Food web: Sponges Hawksbill sea turtle Clams and oysters Plankton Small fish Jellyfish Octopus Sharks Adaptation: Any inherited characteristic that increases an organism's chance of survival The contrasting color found on the turtle's shell helps camouflage the turtle and aids as a defense mechanism.
Since they are cold-blooded, sea turtles have a slow metabolic rate. This slowed metabolism allows them to stay submerged for long periods of time. Hawksbill sea turtles have been known to remain submereged for 35 to 45 minutes.
Sea turtles are strong swimmers. Forelimbs are modified into long, paddle-like flippers for swimming. Levels of classification tree: Kingdom; Animalia
Phylum; Chordata
Class; Reptilia
Order; Testrudines
Family; Cheloniidae
Genus; Eretmochelys
Species; imbricata Ancestors: The first fossil evidence of sea turtle ancestors, The Archelon, dates to 150-200 million yrs. ago. These turtles were much larger than today's turtles. The Archelon was 13 ft. long with a wingspan of 16 ft! Sea turtles are much better adapted to life at sea than their land bound cousins, the tortoises. Their shells are compressed and hydrodynamic while their feet are shaped more like flippers, making them very agile in the water. They have no teeth but, their beaks have modified jaw structures suitable for their specific food. Sea turtles have excellent underwater vison but, are near sighted on land. Convergent Evolution: They normally live in tropical to temperate waters worldwide. Adult green sea turtles prefer coral reefs, sea grass beds and mangroves, while hatchlings and juveniles live farther from shore. Predators; Foxes, weasels, cats, dogs, raccoon, crabs and more eat eggs and hatchlings. Sharks and other large fishes prey on juveniles and adults. Green Sea Turtles; Scientific name: Chelonia mydas Cladogram: Vertebrae Sharks Four Limbs Frogs (Amphibians) Amniotic egg Mammals(Primates) Eggs with shells Crocodiles Hawksbill Sea Turtles Field Studies: They used data collected by the Jumby Bay Hawksbill Project (JBHP) to investigate hatch success. They analyzed hatch success using mixed-model analyses with explanatory and predictive datasets. They incorporated a random effect for turtle identity and evaluated environmental, temporal and individual-based reprodctive variables. Hatch success averaged 78.6% during the study period. Highly supported models included multiple covariates, including distance to vegetation, depostion date, individual intra-seasonal nest number, clutch size, organic content, and sand grain size. Nests located in open sand were predicted to produce 10.4 more viabel hatchlings per clutch than nests located >1.5 miles into vegetation. For an individual first nesting in early July, the fourth nest of the seoson yielded 13.2 more viable hatchlings than the initial cluctch. Generalized beach section and inter-annual variation were also supporeted in our explanatory dataset, suggesting that gaps remain in our understanding of hatch success. Their findings illustrate the evaluating hatch success is a complex proccess, involving multiple environmental and individual variables. Although distance to vegetaion and hatch success were inversely related, vegetation is an improtatnt components of a hawksbill nesting habitat. By: Mark Allan Ditmer, Seth Patrick Stapleton, Department of Fisheries, Wildlife and Conservation Biology, University of Minnesota, Saint Paul, Minnesota, United States of America,
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