BIOL 1000 Lecture Notes - Lecture 32: Impala, Logistic Function, Anemophily
8 Sep 2016
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Document Summary
Of interacting species, usually with a physically defined area. Communities vary in their stability over time. Three themes: species interactions affect distribution and abundance of other species, species are agents of natural selection for other species. Coevolutionary dependencies: outcomes or interactions are dynamic and conditional. Things can change and other factors influence species relationships. Overarching level of analysis is species interactions: competition. Short-term impact: reduces population size of both species, if asymmetric, one species" range or population size is reduced. Long term impact: antagonistic co-evolution, could be character displacement, could be other means. Where two or more species reciprocally affect each other"s evolution. More technical: a change in the genetic compostition of one species (or group) in response to genetic change in another. Can be applied to competition, consumption, mutualism. Also called reciprocal evolutionary change: consumption. Short-term impact: impact on prey population depends upon consumer density, prey and defense effectiveness.
