1 / 21

Sea turtles

Air breathing Ectothermic (cold-blooded) poikilotherms Metabolism fluctuates with the environment temp. Return to land for reproduction Scaled carapace fused to backbone. Sea turtles. Not very diverse 7 species Green herbivores Hawksbill feed on encrusting organisms Leatherbacks

carsten
Télécharger la présentation

Sea turtles

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Air breathing Ectothermic (cold-blooded) poikilotherms Metabolism fluctuates with the environment temp. Return to land for reproduction Scaled carapace fused to backbone Sea turtles

  2. Not very diverse 7 species Green herbivores Hawksbill feed on encrusting organisms Leatherbacks Largest (upto 2 m) Feed on jellies Warm, tropical waters Long migrations (e.g. 2200 km) Vulnerable (see pg. 180) E.g. products, food, by-catch

  3. Tropical Indian & Pacific oceans Laterally compressed E.g. Yellow-bellied sea snake (Puerto Vallarta, Mex; Costa Rica) Protective scales like terrestrial snakes Very venomous Sea snakes

  4. Marine iguana Galapagos Islands Laterally compressed tail Herbivore Salt excreting glands around eyes (like many marine reptiles) Saltwater crocodile Coastal & estuaries Narrow snout Aggressive carnivores Farmed for skins Marine lizards

  5. Homeothermic endotherms Adaptations for flight & sea life Pneumatized bone (dense skull) Waterproof feathers Webbed feet High metabolisms Lots of food (fish & inverts) Diverse morphologies and environments Breed on land, typically monogamous pairs Birds: seabirds & shorebirds

  6. Pelicans Plunge, fill pouch with fish Cormorants Great divers, swimmers oily feathers; yet not entirely waterproof Frigate birds Long distance fliers Not very oily feathers Surface feeders

  7. Gulls Predators, scavengers Terns Surface fliers/plungers Favor nesting sites Shorebirds Lack web feet diverse bills Estuaries & coastal E.g: plover, curlew, oyster catcher Gulls, terns, & shorebirds

  8. Flightless; advanced swimming Denser bones Subcutaneous fat Antarctica mostly Eat krill, fish, squid Monogamous pairs Emperors: Lay a single egg in winter Male incubates on top of feet (64 days) Female collects food Penguins

  9. Brain sizes are larger per pound of body weight than most other animals' Mammals have more efficient control over their body temperatures than do birds Hair provides insulation Mammary glands provide milk to nourish the young Teeth are specialized for cutting, shearing or grinding; thick enamel helps prevent teeth from wearing out Marine mammals Well developed in comparison to other vertebrates Branched from 5 ancestral land mammals Oils, fat layers, blubber Viviparous; placental Very diverse feeding strategies and adaptations Piscivores Indiscriminate carnivores Herbivores Filter feeders baleen Class Mammalia

  10. Shared terrestrial Carnivora ancestor Blubber Insulates, buoyancy, stored energy Breed on land Seals Streamlined body, rear flippers good for swimming Sea lions Flippers support body on land and for swimming External ears Walrus Feed on bottom inverts Deep divers Tusks for defense and anchoring (arctic ice) Order Pinnipedia

  11. Class Mammalia, Order Carnivora, Family Musetlidae (river otters, skunks, weasels) Smallest marine mammal Shallow coastal water No blubber; two layers of fur Front limbs for prey capture and manipulation Feed on benthic inverts Typically bring to surface Sea Otter

  12. Order Carnivora, Suborder Caniformia, Family Ursidae (bears) Semiaquatic Good swimmers, travel miles on arctic ice, ice dens huge feet with heavy fur Tremendous claws White fur for camouflage. Black skin for absorbing heat. Hollow hair for reradiating and collecting heat. Blubber for energy storage and protection from the cold. Incredible sense of smell locating food locating each other for mating (pheromones) need to be able to come together in the vastness of the Arctic. Polar Bears

  13. Order Sirenia Family Dugongidae (dugong and sea cow) Dugong dugon (dugong) Hydrodamalis gigas (Stellar's sea cow) Family Trichechidae (manatees) Elephant-like ancestor Herbivorous; teeth Bone structure Thick skin Nasal morphology Pectoral mammaries Manatees & Dugongs

  14. Order Cetacea Whales, dolphins, porpoises Horizontal flukes Top blowhole Spend entire life in water Toothed whales Carnivorous Includes dolphins & porpoises Toothless whales Whales

  15. Filter feed with baleen plates (keratin) Two blowhole openings Surface feeders Right and Bowhead Rorquals Expandable throat to gulp large amounts of fish and krill Baleen whales

  16. Sperm whales Orcas Dolphins Beaked typically Porpoises No or less beak Toothed whales

More Related