10-20-09 - Biology 330 Class Notes 10/20/09 You DO NOT need...

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Biology 330 – Class Notes – 10/20/09 You DO NOT need to use the raw data We tallied the number of pea radicles with lengths greater than zero What would allow competing species to coexist? (continued from last time…) 4.) RESOURCE PARTITIONING (BEHAVIORAL) (SEE GRAPHS #2 AND #3 IN YOUR WRITTEN NOTES) One species might be better at exploiting few resources The other species might be better at exploiting lots of resources * Overtime, the two species diverge to the point where directional selection – mean response is moving a particular direction Species 1 might be better at exploiting few resources. * Interspecific competition becoming reduced * Intraspecific competition increasing more competition from their own kind versus competition between species It’s almost like the two predators are dividing the resources between the two of them (the species) based on: - Size - Search - Temporality night vs. day This is a behavioral change spreading out of the two species so as to reduce interspecific competition. EXAMPLE: FINCHES – slide 1 Redpoll Linnet Greenfinch Hawfinch They all like different types of seeds (with respect to size)
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Lack of overlap in the diets of common finches suggest morphological or behavioral adaptations. ANOTHER EXAMPLE: Robert MacArthur Boreal Warblers Observed different warblers All warblers were at or near their carrying capacity o He expected that the competition would be fierce Spatial resource partitioning in boreal warblers The warblers are NOT competing for the same resources – they are not feeding in the exact same areas
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10-20-09 - Biology 330 Class Notes 10/20/09 You DO NOT need...

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