Disturbance and Aquatic Biodiversity: Reconciling Contrasting Views
Opinions about how disturbance affects stream biodiversity differ. Models that assume that communities are shaped by biotic interactions emphasize the positive effects of stream disturbance (such as possible colonization by species that would be outcompeted under stable environmental conditions), wh...
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| Veröffentlicht in: | Bioscience 2006-10, Vol.56 (10), p.809-818 |
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| description | Opinions about how disturbance affects stream biodiversity differ. Models that assume that communities are shaped by biotic interactions emphasize the positive effects of stream disturbance (such as possible colonization by species that would be outcompeted under stable environmental conditions), whereas models assuming that communities are shaped by physical habitat factors emphasize the negative effects (such as the exclusion of species lacking adaptations to stress). Empirical studies on macroinvertebrate assemblages show that at small spatial scales, disturbance caused by floods affects diversity negatively. However, the same mechanisms that disturb the biota—scour and fill of sediments—also maintain the heterogeneity of riverine habitats, which underpins the existence of rich communities in the long term and at larger spatial scales. Therefore, the effects of flood-mediated disturbance on biodiversity probably depend on the spatiotemporal scale of observation. The magnitude of the observed effects is modulated by the predictability and severity of floods and the availability of food resources. |
| doi_str_mv | 10.1641/0006-3568(2006)56[809:DAABRC]2.0.CO;2 |
| format | Article |
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Models that assume that communities are shaped by biotic interactions emphasize the positive effects of stream disturbance (such as possible colonization by species that would be outcompeted under stable environmental conditions), whereas models assuming that communities are shaped by physical habitat factors emphasize the negative effects (such as the exclusion of species lacking adaptations to stress). Empirical studies on macroinvertebrate assemblages show that at small spatial scales, disturbance caused by floods affects diversity negatively. However, the same mechanisms that disturb the biota—scour and fill of sediments—also maintain the heterogeneity of riverine habitats, which underpins the existence of rich communities in the long term and at larger spatial scales. Therefore, the effects of flood-mediated disturbance on biodiversity probably depend on the spatiotemporal scale of observation. The magnitude of the observed effects is modulated by the predictability and severity of floods and the availability of food resources.</description><subject>animal ecology</subject><subject>aquatic habitat</subject><subject>aquatic organisms</subject><subject>aquatic plants</subject><subject>Atoms & subatomic particles</subject><subject>Biodiversity</subject><subject>Biological diversity</subject><subject>Biota</subject><subject>Changes</subject><subject>Community Relations</subject><subject>Disturbance</subject><subject>ecological succession</subject><subject>Ecologists</subject><subject>Empirical evidence</subject><subject>Environmental aspects</subject><subject>Environmental conditions</subject><subject>fauna</subject><subject>fires</subject><subject>Flood predictions</subject><subject>Floods</subject><subject>flora</subject><subject>Food resources</subject><subject>Food security</subject><subject>Freshwater</subject><subject>habitat template</subject><subject>Heterogeneity</subject><subject>Hydraulics</subject><subject>intermediate disturbance hypothesis</subject><subject>Invertebrates</subject><subject>Macroinvertebrates</subject><subject>Observation</subject><subject>OVERVIEW ARTICLES</subject><subject>patch dynamics</subject><subject>plant communities</subject><subject>plant ecology</subject><subject>Shear stress</subject><subject>Species diversity</subject><subject>storms</subject><subject>Stream 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Models that assume that communities are shaped by biotic interactions emphasize the positive effects of stream disturbance (such as possible colonization by species that would be outcompeted under stable environmental conditions), whereas models assuming that communities are shaped by physical habitat factors emphasize the negative effects (such as the exclusion of species lacking adaptations to stress). Empirical studies on macroinvertebrate assemblages show that at small spatial scales, disturbance caused by floods affects diversity negatively. However, the same mechanisms that disturb the biota—scour and fill of sediments—also maintain the heterogeneity of riverine habitats, which underpins the existence of rich communities in the long term and at larger spatial scales. Therefore, the effects of flood-mediated disturbance on biodiversity probably depend on the spatiotemporal scale of observation. The magnitude of the observed effects is modulated by the predictability and severity of floods and the availability of food resources.</abstract><cop>Circulation, AIBS, 1313 Dolley Madison Blvd., Suite 402, McLean, VA 22101. USA</cop><pub>American Institute of Biological Sciences</pub><doi>10.1641/0006-3568(2006)56[809:DAABRC]2.0.CO;2</doi><tpages>10</tpages></addata></record> |
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| subjects | animal ecology aquatic habitat aquatic organisms aquatic plants Atoms & subatomic particles Biodiversity Biological diversity Biota Changes Community Relations Disturbance ecological succession Ecologists Empirical evidence Environmental aspects Environmental conditions fauna fires Flood predictions Floods flora Food resources Food security Freshwater habitat template Heterogeneity Hydraulics intermediate disturbance hypothesis Invertebrates Macroinvertebrates Observation OVERVIEW ARTICLES patch dynamics plant communities plant ecology Shear stress Species diversity storms Stream ecology Streams Taxa Theory Water Watersheds |
| title | Disturbance and Aquatic Biodiversity: Reconciling Contrasting Views |
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