BIOL 2260 Lecture Notes - Lecture 9: Semelparity And Iteroparity, Ecological Niche, Pumpkinseed
5 Jul 2016
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Document Summary
Significant features of an organisms life cycle, particularly relating to survival and reproduction: a specific suite of traits shaped by natural selection to maximize a reproductive output. Hypothetical organism that can reproduce without incurring any costs, and which can maximize all aspects of fitness simultaneously. For example o o o o o. Energy available for survival and reproduction is finite: distinct strategies for how to apportion resources, large clutches are more costly than smaller ones. Interact in complex ways a: each reproductive act may increase the rate of mortality. Trade-off"s: organisms cannot maximize all traits simultaneously o. Trade off"s occur between reproduction and survival, offspring number and size: high survivorship favours late maturity or high morality favours early maturity. For example pacific salmon travel long distances to lay eggs then go off and die. Producing larger offspring improves recruitment and gives a higher chance of survival. Increases chance of recruitment r/k selection theory:
