Lecture 9 - Lecture 9 How winter-active endothermic animals...

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Lecture 9 How winter-active endothermic animals avoid freezing from last class. - On cold days animals can BASK in the sun to try to stay warm o Basking can be done while sleeping o Turtles bask on logs and rocks - Shivering is an important means of THERMOGENESIS o Black-capped Chickadees lower their body core temperature by 12 o C. There is a less gradient and less heat is lost. However, bird cannot stay awake and enter a deep sleep called TORPOR (12hrs) - Other animals become inactive (dormant) – ie. Mink frog - For many animals, a body temperature of below zero is fatal (ie. Snakes because they are ECTOTHERMS) o They survive by FREEZE AVOIDANCE in a HIBERNACULUM (crack in the earth, so they are below the frost line) - All turtles (and bullfrogs) escape sub-zero temperatures by going to the bottom of ponds and lakes o American Toads (and many salamanders) dig beneath the frost line - But insects and other invertebrates for dormant ABOVE the frost line (ie. woolly bear caterpillars) o They have a biological anti-freeze. CRYOPROTECTANTS = GLYCEROL.
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