CLAB20H3 Lecture Notes - Lecture 17: Dynamic Equilibrium, Intermediate Disturbance Hypothesis, Carrying Capacity
9 Feb 2015
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Niche" in 1917, as : no two species of birds or mammals will be found to occupy precisely the same niche . Proposed solutions to the paradox of the plankton". Species richness differs among communities due to variation in regional species pools, abiotic conditions, and species interactions. Figure 18. 4 community membership: a series of filters. Community membership: the regional species pool provides an upper limit on the number and types of species that can be present in a community. The importance of dispersal can be seen in cases of non-native species invasions. Figure 18. 5 a humans are vectors for invasive species. Community membership: a species may be able to reach a community but be physiologically unable to tolerate the abiotic conditions of the environment. Some abiotic constraints are obvious (e. g. , fish on land, or more subtle; a lake might not support organisms that require fast-flowing water). Community membership: the final cut requires coexistence with other species.
