BIOB50H3 Lecture Notes - Lecture 6: Propagule, Pinus Ponderosa, Phenotypic Plasticity
18 Oct 2016
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A(cid:374) orga(cid:374)is(cid:373)"s life history is a re(cid:272)ord of e(cid:448)e(cid:374)ts relati(cid:374)g to its gro(cid:449)th, de(cid:448)elop(cid:373)e(cid:374)t, reprodu(cid:272)tio(cid:374), a(cid:374)d sur(cid:448)i(cid:448)al. The characteristics include age and size at sexual maturity, amount and timing of reproduction, and survival and mortality rates. The strategy of life history of a species is the overall pattern in average timing and nature of life history events. Strategies are shaped by the way the organism divides its time and energy between growth, reproduction, and survival. Within a species, individuals differ in how they divide their energy and resources between growth, reproduction, survival, and other processes. Optimal life histories maximize fitness (genetic contribution to future generations) as much as ecological constraints and trade- offs allow. Life history patterns vary within and among species. Phenotypic plasticity one genotype may produce different phenotypes under different environmental conditions. For example, growth and development in ponderosa pines under warm/dry vs cool/moist conditions.
