510 5-5-2011 notes - Niche-Considers relationship of...

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Niche -Considers relationship of organism to biotic and abiotic environment -environmental factors that determine where a species can and cannot maintain a population -set of environmental tolerances and limits -temperature -oxygen -salinity -habitat -acceptance due to work of G.E. Hutchinson -Describes activity range along environmental variables -fundamental niche: ecological potential of a species; hypervolume occupied in the absence of other species -realized niche: that occupied in the presence of interactions Thermal niche -preferred temperature (+/-2 degree C or 5 degree C) -66% of the time within 2 degree C, 100% of the time w/I 5 degree C -Map thermal niches in lakes based on seasonal temperature profiles. -spring- occupy colder waters than thermal niche -thermal niche not available -development of bimodal distribution- one in thermal niche, one not -oxygen containing factor in Lake Mendota, perch make feeding forays into low oxygen conditions Thermal niches in lakes -cold niches larger
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