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Unformatted text preview: Bio Notes Jan 31 Mandatory Readings: Ch. 22-24 • Go over Species-to Species interactions again. - The competitive Exclusion principle- need to know and understand this. The Ghost of Competition Past- Term proposed by J. H. Connell in 1980 to describe one possible reason for observed differentiations in niches. Competing species may be less fit than a species which avoids competing because it occupies a fundamental niche which does not overlap theirs. Natural selection may then favor the non-competing species; its population increases and those of the competing species decrease. The observed differentiation is then the result of past competition and to explain it in this way is to invoke the ghost of competition past.- Keystone Species- Without Pisaster, the ecological diversity decreases astronomically. -Species diversity is much higher in community 1 than in community 2. (In graph) • Trophic levels- (Nutrient food) – The first trophic level is one with most biomass, then it goes up hierarchically. The higher you move the pyramid, the less energy is found. At every level, we drop down to ten percent of the previous level. Most energy at bottom, Least energy at top.--- Similar to the efficiency of conventional cars....
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This note was uploaded on 03/19/2012 for the course BISC 1112 taught by Professor Doebel during the Spring '12 term at GWU.
- Spring '12