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Lecture 9

Ecology Lecture 9.doc

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University of Guelph
BIOL 2060

Ecology Lecture 9 - Population Biology is a study of populations of organisms, especially the regulation of population size, life history traits such as clutch size, & extinction - Population Ecology is a sub-field of ecology that deals with the dynamics of species populations & how these populations interact with the environment  It is the study of how the population size of species living together in groups change over time & space. Population Growth There are a number of ways to model population growth for monitoring/examination/prediction. Density-independent growth (growth does not depend on population size) - Discrete population growth – growth occurs at specific intervals; generations are not overlapping. - Continuous population growth – overlapping generations; offspring of different ages around at the same time as adults. Density-dependent growth (growth depends on population size) - Discrete population growth - Continuous population growth Geometric Growth (1) Non-overlapping (discrete) generations - Parents & offspring are not alive at the same time t - Population not limited (‘unlimited’ resources, no competitors), grow at same rate each time  Examples: annual plants (phlox), univoltine insects (one generation a year), & semelparous (reproduce once in a lifetime) plants/animals - Geometric growth
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