Lecture 41 - Lecture 41: Biology in Winter Rotational axis...

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Lecture 41: Biology in Winter -Rotational axis of Earth is tilted 23* from perpendicular -during yearly orbit around the sun the northern hemisphere is farther from the sun, with shorter  days, in winter -Wilson A. “Snowflake” Bentley: observed snowflakes under a microscope 1. Ecophysiological Strategies 2. Antifreeze 3. Hibernation 4. Brown fat 5. Morphological Adaptations Ecophysiological Strategies for Winter Survival 1. Migrate to Warmer climes (some animals) 2. Stay  a. Go dormant: (almost all ectothermic animals, many plants, some endothermic  animals) b. Remain active (some endothermic animals, some plants) -the winter challenge for ectotherms and plants is to reduce the supercooling point  of body fluids  by antifreeze -many amphibians (but not other vertebrates) can tolerate freezing -frogs overwinter in leaf litter of a few inches below ground -65% of body water can freeze and remainder is protected by antifreeze
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Lecture 41 - Lecture 41: Biology in Winter Rotational axis...

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