220_Lecture_Population_Ecology_ I...

220_Lecture_Population_Ecology_ I... - Population Ecology...

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Population Ecology: Population Dynamics LAND/SOCR 220
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I. Population ecology P pul ti n up f indi idu ls Population = group of individuals of the same species living in the same place at the same time What factors affect the number of individuals in one species in one place? age distribution ? rates of birth and death ? population growth ?
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What is population ? structure? • Population: individuals of a species within a given area Populations are dynamic. Patterns give us insight into birth death movement etc insight into birth, death, movement, etc. “Structure” is a non-random pattern in the population. Can provide info about how the l ti k population works Three types of population structure: spatial temporal (ages) – genetic
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Spatial population structure Habitats are a mosaic of patches that vary in quality Populations are divided into sub-populations By definition, organisms are not likely to leave their sub-population C ll ti f b l ti ll d Collections of sub-populations called “meta-populations” Studies of spatial distribution of populations is also called “Landscape Ecology” Three types of dispersion of individuals in space
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Evenly spaced distribution: competition for water
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Clumped distribution: vegetative reproduction of aspen
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Spatial dispersion patterns
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Individual perception drives i l di i spatial dispersion patterns cy frequenc Distance to nearest neighbor f
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