BIO120H1 Lecture Notes - Lecture 19: Antagonistic Pleiotropy Hypothesis, Interspecific Competition, Pleiotropy
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BIO120H1 Full Course Notes
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Community structure: species richness, composition, alpha/beta/gamma diversity. Success of captive breeding/release programs for conservation. Prospective success following dispersal to new habitats. Roaming behavior coincides with age of high reproductive value. Age of high reproductive value should maximize attractiveness to potential mates. Pleiotropy: one gene may have multiple different functions. Antagonistic: gene may have opposite effects on survival at different ages. A gene with positive value in young but negative in old is favored by natural selection because reproducing early increases fitness. Dispersal, abiotic conditions (climate, nutrients), species interactions (competition, predation, mutualism) Species interactions classified by outcome (+ or -) Intra-specific competition: competition among members of same species (among conspecifics) Inter-specific competition: competition among members of different species (heterospecifics) Contest/interference competition: direct interactions, such as battles over territory. Two species do not need to directly interact or even be active at the same time to compete: if one consumes a resource, leaving less for the other, they compete.
