BS 110 Notes 12-3-2010

BS 110 Notes - organisms 2 Trophic Structure a Plant-herb predator-prey host-parasite interactions b Energy flow and nutrient cycling 3 Species

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BS 110 Notes 12-3-2010 4. Demography – factors that determine size and structure of a population through time Natality(birth) rates – increase in numbers due only to normal rate of reproduction over time o Species, age(size), age structure, sex ratio, type of food Mortality rates – numbers(percentages) of individuals dying in a population Survivorship rates – numbers (percentages) of individuals still living at various ages (times) after birth Demographic analyses of a population are based on compiling a data set called a life table. Summarizes the probability that an individual will survive and reproduce in any given year over the course of its life time Studying a Community 1. Vegetation, Structure and Animals a. Type most common – stratified b. Complex vegetation provides diverse foods and habitats for other
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Unformatted text preview: organisms 2. Trophic Structure a. Plant-herb, predator-prey, host-parasite interactions b. Energy flow and nutrient cycling 3. Species Richness – number of species in the community, Abundance, and Diversity a. Evenness Value – how similar are the number of individuals among the species present b. Species Richness + Evenness = Diversity c. Abundance is not always a measure of importance d. Dynamic Equilibrium Hypothesis – species diversity is maintained or is high based on the occurrences of disturbances that prevent competitive exclusion from occurring so species that are poor competitors remain in the community 4. Stability a. Type of community and nature of disturbance...
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This note was uploaded on 01/31/2011 for the course BS 110 taught by Professor S.lawrence during the Fall '07 term at Michigan State University.

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BS 110 Notes - organisms 2 Trophic Structure a Plant-herb predator-prey host-parasite interactions b Energy flow and nutrient cycling 3 Species

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