lecture 5 2009

lecture 5 2009 - Social Organization Northern Elephant Seal...

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Northern Elephant Seal Social Organization
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Social Organization B) Mating system (Strategy for reproduction) A) Dispersion (Spacing of individuals on the landscape) Random, Regular & Clumped Solitary, Pair-living, Gregarious, Colonial, Communal Monogamy, Polygyny, Polyandry, Group and Promiscuous breeding
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DISPERSION EXAMPLES PLOTTED
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Random or unpredictable dispersion Implications: 1) Individuals are neither repulsed nor attracted to each other 2) Resources evenly or randomly distributed on the landscape = nearest neighbor distance
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Nearest Neighbor Distance (NND) Frequency of NNDs high low near far No discernable pattern Plotting a random/unpredictable dispersion
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Regular or predictable dispersion Implications: 1) Individuals probably repulse each other 2) Resources evenly distributed on the landscape
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Nearest Neighbor Distance (NND) Frequency of NNDs high low near far Strong peak at intermediate NNDs Plotting a regular/predictable dispersion
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Clumped or aggregated dispersion Implications: 1) Individuals are mutually attracted to each other 2) Resources are patchily distributed on the landscape
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Nearest Neighbor Distance (NND) Frequency of NNDs high low near far Strong peak at small NNDs Plotting a regular/predictable dispersion
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Impala (Aepyceros melampus)
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lecture 5 2009 - Social Organization Northern Elephant Seal...

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