Lect 2 Population Ecology

Lect 2 Population Ecology - Population Ecology Life history...

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Population Ecology Life history strategies. Specialized stages and strategies. Reproductive value. Population structure and dynamics. Geometric and exponential growth. Life tables. Carrying capacity, logistic equation. Population regulation.
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Definitions and Concepts Population. All members of a given species in a defined area or region. Populations are often defined operationally. Life History Strategies. Time to reproduction. Offspring produced. Specialized stages. Reproductive value.
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Reproductive Maturation Time to reproductive maturity is quite variable among animals. May be as short as a few days in some insects. Humans have an unusually long time to reproductive maturity of ca. 13 years. Animals with a long developmental time often have extensive parental investment in care of offspring.
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Number of Offspring Produced Some animals produce enormous numbers (millions) of eggs/young with each reproductive event (e.g., cod or urchins), others produce very few offspring each time. In general, # of eggs/offspring produced is inversely correlated with the parental investment in each offspring. Some organisms have such high larval mortality that even very high output rates don’t always result in successful recruitment to the population (e.g., cod). Greater parental investment in “rare” offspring may lead to high survivorship. Both general strategies may be successful.
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Survivorship Curves
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Alternation of Generations Different life cycle stages may have highly specialized morphologies and behaviors. Alternation of generations allows a species to exploit distinct environments. Cnidarians: hydrozoans, scyphozoans, anthozoans alternate between a polyp and a medusa
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Other Specialized Stages Dispersal stage.
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This note was uploaded on 07/21/2010 for the course PHYS 2212 taught by Professor Lasater during the Spring '10 term at Albany State University.

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Lect 2 Population Ecology - Population Ecology Life history...

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