BIO120H1 Lecture Notes - Lecture 16: Kangaroo Rat, Evaporative Cooler, Ecophysiology

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19 Jan 2016
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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Intro: trade offs and compromises: conclude and summarize physiological ecology of animals, begin on plants. Slide 3: kangaroo rat: dealing with extreme water stress. They stand on their hind legs and jump around. If they have an adequate diet of seeds, they never need to drink in their whole lives. Investing atp in pushing those ions around to produce super concentrated urine: metabolic water sufficient, seeds, even though they are pretty dry, have lipids in them, water they get by breaking down fats iii, behaviour. The k rats can metabolise them into water molecules. The exhaled breathe is absorbed by the seeds in the sleeping chamber. It is a recovery technique: hibernate or estivate as adult, store fat. Slide 5: options when physiological stress becomes overwhelming: evasions. We need to evade stressful environments: enter dormant stage (seeds, cysts, eggs, pupae, torpor) with minimal metabolism.

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