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cold hardiness in amphibians and reptiles

Metabolism. Endothermy. Ectothermy.

Mercy
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cold hardiness in amphibians and reptiles

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    1: Cold Hardiness in Amphibians and Reptiles How do poikilotherms deal with extremely cold temperatures?

    3: Metabolism Endothermy Ectothermy

    5: Ectothermic Heat Balance Typical Modes of Heat Balance

    6: Ectothermic Heat Balance Examples of thermal regulation

    7: Ectothermic Heat Balance Examples of thermal regulation

    9: Over-wintering amphibians and reptiles

    10: Over-wintering amphibians and reptiles

    11: Over-wintering amphibians and reptiles

    12: Related to strategy 1

    15: Over-wintering amphibians and reptiles

    17: Over-wintering amphibians and reptiles

    18: Over-wintering amphibians and reptiles

    20: “cold hardiness” in extreme cold Freeze tolerance…the ability af an organism to freeze solid and survive the processes of freezing and thawing Organs are encased in ice, circulation and respiration cease, muscle movement stops. 65% of the animal is frozen solid. The eye turns white or blue due to the freezing of the lens. How animals survive this every winter is yet unknown, yet it happens HOW CAN THIS BE?

    21: Freeze tolerance Several mechanisms at work:

    22: Freeze tolerance

    23: “cold hardiness” in extreme cold Supercooling…the ability af an organism (or liquids within the organism) to exist at sub-freezing temperatures without freezing. HOW CAN THIS BE?

    24: Supercooling Two citeria need to be met in order for a liquid to freeze • the liquid needs to be at or below the equilibrium freezing point • presence of a nucleating agent, or catalyst to provide a location for ice crystals to develop

    25: Supercooling Painted turtles are unlike other turtles ecologically

    26: Painted turtles

    27: Painted turtles

    28: Painted turtles

    29: Painted turtles

    30: Conclusion

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