BIO-8 Lecture Notes - Lecture 16: Paramecium, Intraspecific Competition, Metapopulation
Document Summary
Reduction: removal of individuals lowers n; see graph. Compensation: yet lower n results in reduced intraspecific competition; hence increase r observed compensations in part for removal; idea behind lowering deer population is better for them. Increase: predator converts pretty into offspring; predator population increases. Consumption threshold for reproduction: minimum amount of prey needed to stop reproducing. Predator increase may not occur if consumption level doesn"t permit reproduction. Time lag: inherent lag between consumption and reproduction. Mutual interference: as predator increases, prey may become harder to catch; dragon fly population increases tadpole population becomes harder to catch. Simple predatory-prey models (lotka-volterra assumed just predation) A": proportion of encounters that yield capture. See graph f= number of predator offspring produced per ingested prey. Predicts inherent oscillatory behavior of predator and prey. Assume no competition or any other ecological interaction other than predation. Gause"s lab test: paramecium (prey) and didinium (predator)
