BIOL 2060 Study Guide - Final Guide: Interspecific Competition, Intraspecific Competition, Isocline
13 Feb 2016
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Species distribution limited by abiotic environment but depends on interspecies interaction/biotic environment fundamental niche vs. realised niche. For closed populations, no; immigration (open population) is the key to observing typical l-v predator-prey cycling in lab. For closed populations, yes; special/environmental complexity/heterogeneity is the key to persistence (i. e. l-v population cycling) Interspecific: b/w 2 different populations; (-) effect on each other"s population growth rates and size. Intraspecific: w/in same population; (-) effect on the population"s own growth rate and size. Resource: whoever is fastest at drinking the milkshake is the better competitor. Interference: reaching over and pinching the other person"s straw, physically blocking/interfering with their ability to access the resource. Interspecific competition: (logistic growth model) (dn1/dt) = r1n1 * (1- (n1+ 12n2)/k1) (dn2/dt) = r2n2 * (1- (n2+ 21n1)/k2) = competition coefficient (the effect of adding an individual of species 1 on species 2; goes both ways) 12=1, strength of inter- and intra-specific competition are equal.
