The key to life history theory is that there are

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Unformatted text preview: l be favored in different environments. The key to life history theory is that there are limited resources The key to life history theory is that there are limited resources available, and focusing on only a few life history characteristics is necessary. Examples of some major life history characteristics include: Age at first reproduction Reproductive lifespan and aging Number and size of offspring Temperature regulation in aquatic Tem endotherms Water Water temperature much more stable than that of air (takes much greater change in energy content air (takes much greater change in energy content to to heat/cool water) Convective Convective and conductive heat loss in water is far far more rapid (20-100x) than in air (20Gills Gills expose a large surface area to this vast heat sink sink • Because of these constraints, few aquatic animals are endothermic endothermic Temperature regulation in aquatic Tem endotherms Aquatic mammals – can be endothermic due to: AirAir-breathing (no gills) Insulation Insulation (blubber/fat or thick fur) Countercurrent heat exchangers (also found in Countercurrent heat exchangers (also...
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This document was uploaded on 03/29/2014 for the course ECOLOGY 3450 at Weber.

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