BIOL 202 Study Guide - Midterm Guide: Kelp Forest, Digitaria, Killer Whale
1 May 2017
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Outcomes: lead to exclusion of a species from a locality. Competitive exclusion principle: two species competing for limiting resources (housing, food, etc. ) but species that uses resource most efficiently will eliminate the other: reduction in niche occupancy, character displacement. Tansy studied 2 plants, gallium silvestre (found in alkaline soils) and gallium saxatile (found in acidic soils) to see if competition influenced their location. He wanted to see if competitive exclusion resulted in the different ranges. When planted separately in both types of soil - both survived. When planted together - one species outcompeted the other because it used resources more efficiently. When both in acidic soil, silvestre won, when both in alkaline soil, saxatile won. Species interactions: competition between species, parasitism, mutualism, predation, interaction between consumer and their resources (herbivores and the plants they eat) Competition: competitive exclusion, reduction and niche occupancy, resource partitioning and character displacement (species evolved differences that reduce competition)
