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311DCh53 - Ch 53 pg 1159 1180(1161-1182 Community...

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Ch. 53 pg. 1159 –1180 (1161-1182) Community – assemblage of populations of various species living close enough for potential interaction Interspecific interactions – key relationships in the life of an organism are its interactions with other species in the community Interspecific competition – occurs when species compete for a particular resource that is short in supply Competitive exclusion – strong competition can lead to the local elimination of one of the two competing species Competitive exclusion principle – one species will use resources more efficiently and reproduce more rapidly than other; eventually leads to local elimination of inferior competitor Ecological niche – sum total of a species use of the biotic and abiotic resources in its environment; niche is an organisms “profession” Resource Partitioning – differentiation of niches that enables similar species to coexist in a community; one species niche became modified Character displacement – tendency for characteristics to be more divergent in sympatric populations (geographically overlapping) of two species than in Allopatric (geographically separate) populations of the same two species Predation – refers to a +/- interaction between species in which one species, the predator, kills and eats the other, the prey Cryptic coloration – camouflage Aposematic coloration – animals with effective chemical defenses that exhibit bright
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311DCh53 - Ch 53 pg 1159 1180(1161-1182 Community...

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