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General Ecology_Mahaffy_Date_041310

General Ecology_Mahaffy_Date_041310 - Population ecology...

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Population ecology/ Community Ecology r vs. K life history strategies: a continuum ( and not static) r species short lived small body size rapid development high reproduction at low densities type three survivorship curve no parental care unstable habitats good colonizers poor competitors generalists usually density-independent adult mortality K species long lived large body size slow development delayed, but repeated reproduction type one survivorship curve parental care stable habitats poor colonizers good competitors specialists usually density-dependent adult mortality Types of biotic interactions Mutualism (cooperation) both species A and species B benefit examples: stomach bacteria in cows pollinators lichens Predation (parasitism) one species benefits and the other is affected negatively examples: hawks/mouse cowbird lamprey Competition Both species are affected negatively Examples: Interspecific competition Intraspecific competition Commensalism One species benefits and the other is not affected (positively or negatively)
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Uncommon Mites living in human eyelashes Amensalism One species is affected negatively and the other is not affected Definition controversial Example:
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