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Community Dynamics - Lecture 15 Community Dynamics...

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Lecture 15 - Community Dynamics EVVP/BIOL 350 Dr. Kim de Mutsert Fall 2011
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How does a community establish in a new lake? Pioneer species : well-adapted species for dispersal from one lake to another arrive first Immediate establishment of bacteria and protists (present in soil and air) Resting eggs of rotifers and micro- crustaceans arrive within a few weeks Macrophytes, mollusks, insects, fishes and other aquatic vertebrates appear in the first year or two
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Community dynamics Primary succession
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Community dynamics Secondary succession Important factors in succession: Colonization Competition Autogenic changes in environment
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Biodiversity dynamics
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Disturbance Disturbance: Any relatively discrete event in time that disrupts ecosystem, community or population structure and changes resources, substrate availability, or the physical environment Succession: process by which a community transforms itself until a stable community is formed Digital art by Martin Latter
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Disturbance Intermediate Disturbance Hypothesis
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Long-term Community Changes The species part of a community, and the species richness, depends on a number of factors: - The size of the lake - The level of primary productivity - Nearness of other lakes - Amount of disturbance - Number of species present
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Theory of island biogeography 1) The rate of establishment of new species will decline as more and more species become established in the lake If the lake would contain all the species present in the surrounding habitat, the rate of immigration of new species would be zero (even with new specimens arriving)
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Theory of island biogeography 2)
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