Ch. 13 Population Structures Outline

Ch. 13 Population Structures Outline - Ch. 13 Population...

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Ch. 13 Population Structure Populations Population defined as individuals of the same species in a given area. Population Structure-the density and spacing of individuals within suitable habitat. o And the proportions of individuals in each age class. o Ex. Red Oaks in Pertile Springs Characteristics of populations: Density o Number of individuals per unit area Continuously change due to: o Movement of individuals o Births o Deaths Population size varies based on: Food Supply Predation Rates-parasitism or disease Nest site availability Other ecological factors-nutrients, water, light
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Geographic Range – The overall distribution of a population Dependent on: o Presence of suitable habitat Not normally continuous Each “patch” is a subpopulation Patches are separated by areas of unfavorable habitat. Barriers to dispersal-ex. cliffs, distance, roads Competition Plant example: Juncus effuses-type of brush Has limited suitable habitat-wetland plant. Patched of habitat occur naturally
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Ch. 13 Population Structures Outline - Ch. 13 Population...

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