Lecture 20

Lecture 20 - curve Carrying capacity – number of...

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Lecture 20 [email protected] Ecology – the study of how organisms interact with one another and their environment o “Eco” = “Oikos” means home o Computer technology changed ecology Ecology can be studied at the level of… o Ecosystems o Communities o Populations Population ecology o Population – an interacting group of individuals within a species who can AND DO interbreed 3 ponds with fish, all the minnows are the same species but they can’t breed outside of their own pond o Population growth determined by… Biotic potential – how much a population could grow if there were no restrictions Characterized by a j-shape curve Population growth curve is characterized by s-shape curve Environmental resistance – exists between the j-shape an s-shape
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Unformatted text preview: curve Carrying capacity – number of individuals that an environment can support • Varies from year to year o Population interactions affect density Density independent – environmental conditions (hurricanes, fires, weather, etc) • More about control of number than regulation of numbers • Correlations and causation o Storks bring babies Density dependent – factors that are influenced by the density of individuals in a population • Negative feedback loop • Density dependent competition results in… o One species may disappear from an area (competitive exclusion) o Natural selection may cause character divergence (character=trait) – can lead to habitat or niche partitioning •...
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This document was uploaded on 10/26/2011 for the course BIOL 101 at UNC.

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