BIO 200 Lecture Notes - Lecture 27: Evolutionary Pressure, Allopatric Speciation, Hydrobia
20 Nov 2017
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Bio200 jessica poulin lecture 27: species interactions. It gets colder -> selective pressure on fur (getting fluffier during the winter) Competition: when two or more species need the same resource (use by one reduces availability for the other) (niches) (negative for both participants) Predation: when one species eats another (predator positive, prey negative) Symbiosis: a permanent interaction of two species. Competition in other species is often hard to see (occurred in the past worked out by species involved) Maccarthur"s warblers: the ghost of competition past division of trees he measured was evidence of competition. > sir arthur george tansley (the national portrait gallery in london) - > how we think about ecology and ecology interactions (abiotic, biotic factors) Closely species grow in slightly different soil types. Naturally different resource requirements species won"t survive in different soils. Each species grows best on its home soil -> moderately well on the opposite type when they are alone.
