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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 Don’t 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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