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Fish and Herps Amphibians and Reptiles

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Fish and Herps Amphibians and Reptiles

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    1. Fish and Herps (Amphibians and Reptiles)

    2. FISH Complete their lifecycle in water Respiration by gills (mostly) Many desert fish endangered due to Habitat Loss (dams, diversions, groundwater pumping, grazing, etc.) Introduced Species

    3. AMPHIBIANS Have anamniotic eggs, permeable skin, and a larval stage Anamniotic eggs are jelly like and must be laid in water or moist area Respiration by skin augmented by gills or lungs Amphibians hatch as a larva and metamorphose to an adult form. Includes salamanders, frogs, toads, spadefoots, etc.

    5. REPTILES Have scaled skin, amniotic eggs, and no larval stage Amniotic eggs have a shell and must be laid on dry land Respiration by well-developed lungs Includes turtles, lizards, snakes, crocodiles, etc.

    6. Reptile: tail autotomy

    7. Reptile: Birth Oviparous: egg-laying Advantages/disadvantages? See self quiz Ovoviviparous: live birth after retaining egg within body Advantages/disadvantages? See self quiz Viviparous: live birth after fetus develops within mother while drawing nutrients from her all along

    9. Reptile: Parthenogenesis Every member of species is female (e.g., sonoran spotted whiptail).

    10. Reptile: Parthenogenesis Reproduce by cloning (without sex: young hatch from unfertilized eggs)

    11. Reptile: Parthenogenesis Advantages Population potentially increases twice as fast because every member produces offspring No time, energy, risk with finding mate Dont mess with success (genes worked for mother)

    12. Reptile: Parthenogenesis Disadvantages Little genetic variability means less adaptability No two-parent care

    13. Reptile: Territoriality Geographical Range: everywhere species lives. Home Range: everywhere individual lives. Territory: everywhere individual defends.

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