BIOLOGY 1M03 Lecture Notes - Lecture 7: Pioneer Species, Humus, Intermediate Disturbance Hypothesis
14 Jun 2020
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Document Summary
Gleason - individualistic hypothesis: the community is a chance assemblage of species with similar habitat requirement. Argues that the ranges are based on limits of tolerance for the species involved. Supported by santa catalina mountain trees: f. e. Clements - interactive hypothesis: the community is an assemblage of stable and integrated species, locked into association by mandatory interactions. Argues that co-occurrence of tree species in eastern deciduous forest supports this interactive hypothesis. Community members: some members of communities are bound in various types of interactions (i. e. clements. Interactive hypothesis): most members of communities share habitats or ecosystems in common because of limits of tolerance or niche dimensions (i. e. gleason"s individualistic hypothesis). Ecological succession and disturbance: communities are not static, ecological succession: non-seasonal and directional pattern of colonization and extinction on a site by di erent species, primary succession: begins with a virtually lifeless" environment.
