BIOL 201 Study Guide - Midterm Guide: Eric Pianka, Robert Macarthur, Continuum Hypothesis
4 Feb 2018
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Document Summary
R selecting: habitats that are variable in time favor short lived organisms that develop rapidly and reproduce early. Habitats of r selecting: usually unpredictable or ephemeral, patchy, intermittent periods that allow for rapid growth. R species: small size, early maturity short life and semelparity small but more offspring, no parental care. K selecting: habitats that are constant over time favor long lived competitive organisms that develop more slowly and reproduce later. Habitats for k selection: constant or predictably seasonal habitats. Competition determines; adult survivorship and fecundity, juvenile recruitment. K species: large species, delayed reproduction, longer life, iteroparity, large but fewer offspring, parental care: grimes hypothesis: habitats are classified by where they fall along 3 continua. Degree of chronic stress (s : aspect of life history, cost of reproduction: lady slipper orchids, high levels of fruit production decrease the probability of reproduction in the future, age at first reproduction reproduction is costly.
