lecture 19 succession posted

lecture 19 succession posted - What is a community? Your...

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What is a community? Your text: “the species that live and interact within an area”, P. 398. “It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependent on each other in so complex a manner, have all been produced by the laws acting around us.” -Darwin, The Origin of Species (concluding paragraph)
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Evolutionary Processes Physiological Constraints Historical Events Species Pool (species that COULD exist in a place-- it is within their fundamental niche) Habitat Selection Dispersal ability Group of species that arrive at a location and interact Species composition of the local community Species Interactions (predation, etc) What determines which species coexist in a community?
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Time Community composition can vary over time: determined by the balance between the ability of new species to invade and established species to resist invasion • new species arrive when ___they colonize_____ • old species disappear when they ge outcompeted or are removed by disturbance Abundance disturbance early successional mid successional late successional “pioneer” “climax” Successional stages Community composition can be “reset” by disturbance , the removal of organisms by physical (wind, waves, fire) or biological (grazers, burrowers) processes Succession : more or less predictable changes in the composition or structure of an ecological community. ( Change in species composition over time)
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Types of succession Climatic – long-term succession driven by climatic change_______ Primary - _succession beginning with bare rock or soil Secondary - occurs when a place occupied by living things is disturbed, returning it to an earlier point in its ecological history (take a peak of forest, grow corn there, then stop growing corn, turns back to forest. Already had microorganisms and stuff in it already.
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This note was uploaded on 11/29/2010 for the course BIOLOGY 1211 taught by Professor Patricelli during the Spring '10 term at UC Davis.

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lecture 19 succession posted - What is a community? Your...

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