BIOLOGY 1M03 Lecture Notes - Lecture 8: Bighorn Sheep, Lungworm, Ecological Niche
14 Jun 2020
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Density dependent limiting factors: intraspeci c competition (logistic growth, interspeci c competition - between species competition. Niche: the total ecological resources requirement of a species. Predator/prey ratio may increase with increased prey density. Predator performance may increase with practice (when prey density is high: disease and parasitism. Barnacles (crustaceans closely related to cray sh) Two species of barnacles: one species (chthamalus) lived at mean high tide and above (resistant to drought), other species (semibalanus) lived below mean tide line: hypothesis: Adult chthalamus are competitively excluded from the low intertidal zone: experiment: Transplant rocks containing young chthamalus to low intertidal zone. Remove semibalanus from half of each rock; monitor survival of chthamalus on both sides: prediction, conclusion: Semibalanus is competitively excluding chthamalus from the lower intertidal zone. Crypsis: matching your background; hard to detect. Aposematic colouration: bright colouration indicating poisonous. Mimicry - batesian: often mimics aposematic colouration, batesian mimicry individuals are not poisonous.
