Chapter 55

Chapter 55 - Ingrid Shih BIO 1306 23 February 2011 Chapter...

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Ingrid Shih BIO 1306 23 February 2011 Chapter 55: Population Ecology 55.1 How Do Ecologists Study Populations? Population Density o Ecologists count individuals and calculate the rates at which individuals enter and leave the population Counting individual (full census) Count subset of individual and extrapolate to whole ecosystem Mark-recapture method Capture, mark, release, re-capture The proportion of marked individuals in the new sample is used to estimate population size Dispersion Pattern o Spatial distribution of individuals in the environment o Dispersion determinants patterns of interaction among individual o 3 different types Clumped- presence of one individual at any pt increases the probability of others being near that point Whales Insects Regular- presence of one individual at any pt reduces probability of others being near that point Bears Nesting birds Random- there is an equal probability of an individual occupying any point in space Flowers Plants Plankton Population Age Structure o Distribution of individual across age categories o Impacts population growth b/c reproductive capacity varies with age o Lots of young individual ~ greater growth potential Tracking demographic events: Life Table keeps track of births, deaths, etc o A cohort life table tracks a group of individual born at the same time o Survivorship: numbers that are still alive at later dates o Mortality: the proportion of each age class that die before reaching the next age class
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This note was uploaded on 03/23/2011 for the course BIO 1306 taught by Professor Adair,tamarah during the Spring '08 term at Baylor.

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Chapter 55 - Ingrid Shih BIO 1306 23 February 2011 Chapter...

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