Sea Turtles.

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Presentation transcript:

Sea Turtles

TRIVIA TIME There are 7 Species of sea turtles. How many are endangered? What is the highest a turtle can weigh? Hawksbill, a type of sea turtle, has had what percentage cut out of its total population in just 100 years? True or false: You can tell a turtle’s age by their physical appearance. What is the physical difference between male and female turtles?

Characteristics Large, streamlined shell Upper :Carapace Lower: Plastron Non retractable head and flippers Hard plates : Scutes Pale green to Black coloring No Teeth, Varying Jaw Vision and Smell Theorized they can live over 100 years

Habitat Live in almost every ocean basin, nesting on tropical and subtropical beaches

Diet Sea grasses. Jellyfish. Crabs. Clams. Sponges. Depends on species.

Lifecycle

Females Lay eggs on Nesting Beach in Tropics 6 weeks to 2 months: Hatchlings come to surface and head to water. Attracted by Horizon . Time from first swim to the return towards coastal waters: A decade. “The lost years” Unknown Dinner plate size: Appear at feeding ground in nearshore waters Can take up to 40 - 50 years until turtle ready to mate and reproduce Males rarely return to Land. Females return to beach where they were born to nest

Photopollution: Manmade light sources disrupt natural patterns of light and darkness.

Temperature-Dependent Sex Determination -Temperature of sand around the egg affects how long the turtle needs to grow -Determines sex of baby -Rising climate due to global warming affects this egg development. Unbalanced proportions of males to females

Reproduction rates are slow so difficult to recover Possible Extinction Poachers meat, fat, eggs, and shells. Entanglement in fishing gear Tourism Ocean pollution Reproduction rates are slow so difficult to recover

What can you do? -Don’t buy turtle food or souvenirs -When visiting turtle beaches… …follow the rules. Do not touch or feed turtles when diving or snorkeling What can you do? http://www.anywherecostarica.com/travel-guide/sea-turtles-nesting-seasons-map

References Frezzotti, Emmanuel. "Costa Rica Has a Sea Turtle Egg-Poaching Problem." Coastal Issues / Coastal Care. N.p., 21 May 2013. Web. 6 Feb. 2014. <http://coastalcare.org/2013/05/costa-rica-has-a-sea-turtle-egg-poaching- problem/>. “Information About Sea Turtles.” Sea Turtle Conservancy. 2012. Web. 6 Feb. 2014. <http://www.conserveturtles.org/seaturtleinformation.php?page=overview>. Johnson, Alex. "20,000 Endangered Sea Turtle Eggs Crushed in Trinidad." The Epoch Times. N.p., 16 July 2012. Web. 6 Feb. 2014. <http://www.theepochtimes.com/n2/world/20-000-endangered-sea-turtle- eggs-crushed-in-trinidad-264873.html>. Leenders, Twan. “Sea Turtles: Promises and Threats.” A Guide to Amphibians and Reptiles of Costa Rica. Zona Tropical, S.A, Miami, FL, 2001. Web. 6 Feb. 2014. <http://www.anywherecostarica.com/travel-guide/sea-turtles-nesting- seasons-map>. "Sea Turtle Facts." Facts About Sea Turtles. See the Wild, 2013. Web. 6 Feb. 2014. <http://www.seeturtles.org/43/sea-turtle-facts.html>. "15 Pictures – Sea Turtles." 15 Pictures. N.p., 13 Apr. 2013. Web. 6 Feb. 2014. <http://15pictures.com/15-pictures-sea-turtles/>.