BIO120H1 Lecture Notes - Lecture 6: Semelparity And Iteroparity, Natural Selection, Predator Satiation
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BIO120H1 Full Course Notes
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Life histories = living to repro repeatedly. Life histories = d after first r. Plants = monocarpy but term can restrictively describe plants where individual shoots die after reproducing, and not entire plant! Short lived species: annual + biennial plants (crops) Annuals live in habitats where s beyond growing seasons is low. Life variety of species live for many years before a single, massive, fatal repro (salmon, bamboo) While all annuals plants are semelparous, not all perennial plants are iteroparous. Semelparous species usually make more offspring in their single repro episode than closely related species do in any of theirs. When an org does not need to withhold some resources to ensure future s + r, all available sources put into a single, massive repro episode. Or, when benefits of r grow faster at high levels of r. Theoretical models for evol of semelparity, but empirical tests for each are limited.
