PNB 2250 Lecture Notes - Lecture 30: Neutral Buoyancy, Glycogen, Reactive Oxygen Species
17 Nov 2016
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Understand the choices animals make in how they move. Understand how animal movement is affected by their niche. Understand how metabolic rate affects life span in animals. Medium: affects gravity (buoyancy, different viscosities (water vs. air, different drag, different coefficient of friction. Swimming: near neutral buoyancy no energy to support body weight. Huge advantage: largest animals live in the ocean. Most likely swamp creatures: extremely efficient. Near neutral buoyancy is a big advantage. Viscosity (drag) not as big an impact as gravity. Drives shape of scales & covering of mucus: switching. If you are designed to run, it is very expensive to swim. If you fly, it is very expensive to swim. Week 11 lecture 30 energetic costs of locomotion friday 11/11/16: lowest viscosity. Easy to move through air: gliding (hawks) Thermal issues: most effort to support weight. Birds have from one third to half the density of terrestrial animals.
