BISC 204 Lecture Notes - Lecture 4: Indeterminate Growth, Phenotypic Plasticity, Cascades Frog

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Ex. ) mosquito = 14 days and desert tortoise = 25-30 years. Semelparity: when an organism only reproduces once in its lifetime. Iteroparity: when an organism can reproduce multiple times during their lifetime. Annual: when the life span is one year. Perennial: an organism that has a lifespan of more than one year. Fecundity: number of offspring produced per episode. Ex. ) elephant = 1, western toad = 8000-15000. Life span: survival schedule, aging and senescence (pattern of dying) Some species have life histories with high fecundity, short time to maturity, and poor survival (asian tiger mosquito) Some species have life histories with low fecundity, long time to maturity, and high survival (african elephant) Life history diagrams summarize average life history events (usually involve 1-year time steps) Life histories are the result of natural selection. They represent successful ways of allocating limited resources to carry out various functions of living organisms. Tradeoffs exist in the allocation of resources.

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