DISTURBANCE (and succession)

DISTURBANCE (and succession) - DISTURBANCE(and succession...

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6/4/11 DISTURBANCE (and http://www.youtube.com/watch? v=vdUIyb0amGs&feature=relate
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6/4/11 What is disturbance? ‘Discrete , punctuated killing, displacement or damaging of one or more individuals that creates an opportunity for new individuals to become established’ Sousa, 1984
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6/4/11 One extreme…
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6/4/11
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6/4/11
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6/4/11 What causes Physical : weather (extreme heat or cold, high winds), fire [in terrestrial systems], volcanoes, water motion [waves or rapids in aquatic systems] 6 Biological : consumer fronts, herbivore population outbreaks,
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6/4/11 Disturbances can cause Following a disturbance event, the species composition of a community can be altered. 6 This is because 1) there is a reduction in competition, and 2) certain species are adapted to exploiting post-disturbance conditions where competition is low
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6/4/11 Recovery through Succession can take place where all pre-existing biota have been removed, or where new habitat has been created:
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6/4/11 Primary succession For example: ponds naturally develop into dry land through ‘bog succession’
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6/4/11 Primary succession 1. Rooted aquatic plants become established at the edge of a pond 1. Some species of sedges form mats on the water surface extending out from the shoreline 1. Detritus produced by the sedge mat accumulates as layers of organic sediment on the bottom of the pond where decomposition is slow in the anoxic, stagnant water.
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6/4/11 Primary Succession
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6/4/11 Recovery through More commonly, succession proceeds following the loss of some (but not all) of the pre-existing organisms. 6 This is termed ‘secondary succession’
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6/4/11 Following clearing After 7 Yrs After 15 Yrs After 30 Yrs After 95 Yrs After 150 Yrs
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Succession No life Pioneer stage Intermedia te stage Climax stage Some life Intense disturbances at any stage can re-set the community to a previous stage Secondary and primary succession are distinguished by their starting points: no life (primary) vs. some life (secondary). SECONDA
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DISTURBANCE (and succession) - DISTURBANCE(and succession...

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