#16 - Community Stability & Similarity

#16 - Community Stability & Similarity - Text material...

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1 Text material relevant to this week’s lab exercise Figure 20.3 (page 581) Community stability What is “stability” and how can we assess it? Measures of stability • Consistency in species composition , and/or in the relative abundance of the constituent species – These are the inputs required for similarity indices , and they can also be used to assess stability by computing them for a single community at one or more times • We will come back to this later in the lecture
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2 Measures of stability • Resistance – The amount of “force” that is required to change a community “significantly” • Resilience – The ability of a community to return to its original composition following a disturbance Resilience • Elasticity – the rapidity with which a community returns to its original state following disturbance • Amplitude – The maximum degree of disturbance from which a community can still return to its original state Boreal lakes Isolated oligotrophic lake: low resistance low resilience “Drainage” oligotrophic lake: low-moderate resistance moderate-high resilience Responses of two lakes to a short-term (acute) disturbance +P +P (+P) indicates an input of phosphorus, often a limiting nutrient in freshwater lakes How might the effect of (+P) be different if the lakes were eutrophic (~ highly productive) instead of oligotrophic?
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This note was uploaded on 04/24/2008 for the course BIOL 216 taught by Professor Baker during the Spring '08 term at Clark University.

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#16 - Community Stability & Similarity - Text material...

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