BIOLOGY 1B Lecture Notes - Lecture 19: Georgy Gause, Interspecific Competition, Ecosystem Ecology
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->grew species of paramecium in bottles of medium. ->severe storm, drought, avalanche, fire-->not density dependent-->independent large events that kill large number of individuals. -> birth rate equals death rate, so the overall growth rate is 0. ->if there"s a slope (whether positive or negative)-->that means the population growth/decay depends on density of the population. ->independent if there is no relationship between population density and whatever we are talking about. ->today: types of interspecific interactions, dynamics of interactions. Interacting biological entities (not discussing abiotic parts yet) ->community ecology: just focuses on sets of organisms interacting with each other, not the nonliving parts such as nutrients, climate, etc. ->consumer-resource: predation, herbivory, parasitism, pathogen interactions: sp 1 increase, species 2 decrease. ->commensalism: species 1 benefits, species 2 no effect. ->amensalism: species 1 negative effects, species 2 no effect. ->mutualism: rattle ants and small oakblue butterfly, australia. ->different layers of life, using different layers differently.
