pcb 3044 chapter 7 - Chapter 7 Life History Analyses...

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Chapter 7: Life History Analyses Introduction An organism’s life history is a record of events relating to its growth, development, reproduction, and survival. Characteristics that define the life history of an organism: o Age and size at sexual maturity. o Amount and timing of reproduction. o Survival and mortality rates. Figure 7.3 Life History Strategy Life History Diversity Phenotypic plasticity: One genotype may produce different phenotypes under different environmental conditions. Morphs: Discrete types (few or no intermediate forms) Polyphenism: multiple discrete phenotypes. Figure 7.4: Plasticity of Growth Form in Ponderosa Pines o Desert: Shorter, but thicker trunks. o Allometry: Differential growth of body parts in response to changes in environment. Figure 7.5: Polyphenism in Spadefoot Toad Tadpoles in Arizona o Omnivores feed on the pond bottom on detritus o Carnivores feed in the water column on fairy shrimp.
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