BIOB50H3 Lecture Notes - Lecture 9: Coevolution, Commensalism, Myxoma
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A. j tansley 1st expt in competition(1917) 2 species of bedstraw g. hercynicum(acidic soils) + g. pumulium(calcareous soils) Both grown individually survive on both soils, together determined by soil type on which it is grown. Darwin theory ofstrrugle of existence competition limits abundance/distribution of competing species. Inter-specific competition >b/w 2 diff species, both harmed as using same resource. Outcome of competition limits growth, survival & reproduction of each (competing species) Resources must be depleted(ie :food/water/ space etc) eg: space limiting resource for corals. Tilman expt 1981 2 species of diatoms (single cell algea, make cell walls of. Syndera(fig 11. 4, blue line) wins competition against other. Reason even @lower conc of resource species can persist(survive. Schoener(1983) interspecific competitions study 390 species majority show effect of comp in some conditions(76%) and all(57%) Connel(1983) 50% of 215 species found competition important. Gurevitch(1992) comp had significant effect on species(competitive effects for 93 species) Exploitation competition compete indirectly use of same resource(r-star) eg :
