notes 2 - Life Histories Life history the pattern of birth,...

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Life Histories Life history – the pattern of birth, growth, development, reproduction, senescence, and death in the individuals of a species Life history strategies - everything that the individuals do to adapt themselves to their particular environment Life history attributes (traits/characteristics) - Non-reproductive attributes A. Body size- large range within a particular taxonomic rank - Mammals: pygmy shrew (2g) blue whale (80,000,000g) - Large animal do better in cold habitat (smaller SA/V ratio) - Small animal do better in warm habitat (larger SA/V ratio) - Large tree more resistant to fire, but more susceptible to wind - Larger organisms reproduce more slowly but longer lifespan - Opposite to smaller organism, reproduce faster but shorter lifespan (advantageous in changing environment) B. Metamorphosis- the complete change in the body plan during the life of an organisms - Egg Larva Pupa Adult (Moths) - Egg Tadpole Adult (Frog) - Advantage : Larva and Adult butterfly eating totally different stuff; therefore, decrease in competition. In another word, partitioning to niche to avoid competition of young and adult of same species. - Disadvantage : very energetically costly C. Resting stages resistant/inactive states to avoid unfavorable conditions - Hibernation / torpor in mammals or birds to avoid temperature
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This note was uploaded on 05/29/2008 for the course BIO 325 taught by Professor Brandom during the Spring '08 term at Cal Poly Pomona.

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notes 2 - Life Histories Life history the pattern of birth,...

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