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Community Ecology I-PRS

Community Ecology I-PRS - Georgia Tech School of Biology...

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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Community Ecology
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Communities -a group of populations of different species living close enough to interact - classify interactions according to their impacts on the participants - positive interactions (+) improve the survival and reproduction while negative (-) interactions have the opposite effect - competition, predation, parasitism, mutualism
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Competition - a -/- ecological interaction - common resource use - resources are in limited quantity - resource use leaves less for self and others - reduces growth and reproduction
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Types of competition 1 st ask who…..2 nd ask how intraspecific competition – between conspecifics, implicit in the idea of “K” interspecific competition – between members of different species each individual adversely affects another in the quest for food (nutrients), living space, mates or other common needs
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Types of competition Interference competition: resources are defended direct interaction between species A and B - resource defense entails costs and you might not succeed A B R
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Interference competition Lycaon pictus – the African wild dog - hunts 3 – 4 hrs. / day - What if they lost 25% of their food to hyenas? - spotted hyenas often steal food from the wild dogs
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Interference competition Crocuta crocuta – the spotted hyena - wild dogs and spotted hyenas cannot stably coexist - the wild dogs are already operating close to their physiological limits, therefore…… - estimated that the dogs would have to hunt 12 hrs. / day to off-set costs
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