Sea turtles

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Sea turtles

  1. 1. Sea Turtles
  2. 2. Reptiles – shared characteristics• Threechamberedheart• Scales• Internalfertilization• Externaldevelopment(eggs)
  3. 3. Marine Types• Sea Snakes – Pacific & Indian Oceans, 50 species• Marine Iguanas – Galapagos, only one species• Sea Turtles – Wider distribution, 8 species
  4. 4. Types that visitLong Island• Kemp’s Ridley• Hawksbill• Green• Loggerhead• LeatherbackOther Types• Pacific• Flatback• Olive
  5. 5. Anatomy• Use a beak for feeding (crabs, algae, jellies)• Plastron – ventral shell• Carapace – dorsal shell; spine fused to it• Lungs (NOT GILLS!!)
  6. 6. Life Cycle• Mate just offshore at 15-30 years old• Every 2 – 4 years return to natal beaches to lay 100-160 eggs• Eggs are leathery, about ping pong ball sized• Eggs incubate for about 2 months before hatchlingshead toward water under cover of the moon• Warm temperatures females• Cool temperaturesmales
  7. 7. Status• All endangered orthreatened– Kemp’s Ridley mostendangered– In 1947 there were42,000. Today thereare 400-500
  8. 8. Threats• Humans• Predators• Habitat loss (mostly loss of beaches)• Sea level rise• Drowning in shrimp nets• Choking on plastics, other floatable garbage• Boat collisions• Disorienting lights on beach businesses (leadshatchlings away from water)
  9. 9. Threats• Humans• Predators• Habitat loss (mostly loss of beaches)• Sea level rise• Drowning in shrimp nets• Choking on plastics, other floatable garbage• Boat collisions• Disorienting lights on beach businesses (leadshatchlings away from water)

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