BIOLOGY 1M03 Chapter Notes - Chapter 53: Semibalanus Balanoides, Chthamalus Stellatus, Intertidal Zone
15 May 2017
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Document Summary
A biological community consists of interacting species, usually living within a defined area. To study species interaction, biologists focus on analyzing the effects on the fitness of individuals involved. /- relationship known as competition: +/- relationship known as consumption and parasitism, +/+ relationship termed mutualism, +/0 relationship termed commensalism, ex. If bird attacks start to force other insects into path of ants, then both benefit and relationship becomes mutualistic. If birds begin to steal prey that would otherwise be taken by ants, relationship becomes parasitic. Competition: competition is a -/- interaction that occurs when different individuals use the same resources and when those resources are limiting. 2: competition that occurs between members of same species is called intraspecific competition. Intraspecific competition for space, sunlight, food and other resources i(cid:374)te(cid:374)sifies as populatio(cid:374)"s de(cid:374)sit(cid:455) i(cid:374)(cid:272)reases. If asymmetric competition occurs and the two species have completely overlapping niches, then the stronger competitor is likely to drive the weaker competitor to extinction.
