Competition II - Competition II 6/4/11 Recap: competition...

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6/4/11 Competition II
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6/4/11 Recap: competition and ‘Use or defense of a resource by one individual that reduces its availability to another individual of the same ( intraspecific ) or other species ( interspecific)’ n If a resource is used in a different way, or in a different form, competition will be relaxed.
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6/4/11 The niche and resource use The extent of niche overlap (along axis/axes that describe(s) limiting resource(s) determines (all else being equal) the strength of Resource gradient (NOT the amount of a resource, but its form/type; e.g. prey size) Rate of resource uptake
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6/4/11 The niche and resource use Not just what form of limiting resource is consumed, but where it is…
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6/4/11 Interspecific competition Niche differentiation Selection Reduced competition The niche and resource use: do niche differences result from How can we tell whether related species differ due to selection resulting from interspecific competition or simply from independent adaptations to the
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6/4/11 Character displacement Size of prey Size of prey Frequency Tim e If two species are brought together in the same habitat (e.g. dispersal event), individuals that exploit different part of resource spectrum will be
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6/4/11 Prediction…
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6/4/11 Test: Character displacement in Galapagos finches In this case it seems that character (niche) differences in sympatry result from the selective
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6/4/11 Importance of resource heterogeneity Differences between species can only be expressed if a range of resources are available 6 If the breadth of resources are reduced, species may no longer be able to coexist – reducing species richness.
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Niche partitioning re-cap Complete Competitors Cannot Coexist 6 Strong selective pressure of interspecific competition may have led to (and maintains) niche differentiation among species that share resources. 6
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This note was uploaded on 06/04/2011 for the course PCB 4043 taught by Professor Osenberg during the Fall '10 term at University of Florida.

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Competition II - Competition II 6/4/11 Recap: competition...

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