The no-interaction model does not mean that interactions should not be studied
Article Abstract:
Oksanen's 'no-interaction' model suggests the existence of a humped-back relationship between species diversity and biomass. The relationship is proposed to be a geometric function of certain evident suppositions. It is emphasized that the model does not assume self-thinning although it is based on reasoning similar to that of the geometric explanation for this concept. It is also argued that the 'no-interaction' model does not discount the existence of the humped-shaped species diversity-biomass curve, or the existence of interactions in vegetation.
Publication Name: The Journal of Ecology
Subject: Environmental issues
ISSN: 0022-0477
Year: 1997
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Is the humped relationship between species richness and biomass an artefact due to plot size?
Article Abstract:
The humped relationship shown by the graph between species richness and biomass has been used to explain how stress reduces biodiversity. Research has shown that the humped relationship can be generated even when no enviromental stress is present, i.e. there is no interaction or stress present. The area studied has a fixed minimum above-ground size and the plot's biomass is determined by the number of plants in the plot. The humped relationship is no longer a sufficient explanation to relate environmental stress to biodiversity.
Publication Name: The Journal of Ecology
Subject: Environmental issues
ISSN: 0022-0477
Year: 1996
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The humped relationship between species richness and biomass - testing its sensitivity to sample quadrat size
Article Abstract:
The occurrence of maximum species diversity at intermediate levels of biomass results in a humped diversity-biomass relationship. Oksanen suggested that the pattern was created by the humped relationship between biomass and plant number, as well as the monotonic relationship between plant number and species number. His 'no-interaction' model is examined in terms of the required assumption that an increasing monotonic relationship exists between the plant number and species number. The shortcomings of the model are discussed.
Publication Name: The Journal of Ecology
Subject: Environmental issues
ISSN: 0022-0477
Year: 1997
User Contributions:
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