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Effect of a change in physical structure and cover on fish and fish habitat in freshwater ecosystems – a review and meta-analysis.
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- Author(s): Smokorowski, K. E.1 ; Pratt, T. C.1
- Source:
Environmental Reviews. 2007, Vol. 15, p15-41. 26p. 2 Charts, 4 Graphs.- Subject Terms:
- Source:
- Additional Information
- Abstract: Aquatic resource managers are continually faced with construction or site development proposals which, if allowed to proceed, would ultimately alter the physical structure and cover of fish habitat. In the absence of clear quantitative guidelines linking the change in habitat to fish, resource managers often use the change in habitat area as a basis for decisions. To assess the weight of scientific evidence in support of management decisions, we summarized both the observational and experimental freshwater fish-habitat literature. We then extracted data from experimental studies (where possible) for inclusion in a meta-analysis, to provide a more rigorous assessment of the published results of experimental habitat manipulations. We found relatively strong and consistent correlational evidence linking fish and physical habitat features, yet inconsistent evidence when narratively reviewing the experimental literature. On the whole, decreases in structural habitat complexity are detrimental to fish diversity and can change species composition. Increases in structural complexity showed increases, decreases, or no measurable changes in species and (or) communities. The majority of our meta-analyses resulted in supporting a direct link between habitat and fish abundance or biomass, with fish biomass responding most strongly to habitat change. Habitat alterations are most likely to affect individual species or community structure, and thus evaluating the extent of the effect on a biological basis depends on management objectives. [ABSTRACT FROM AUTHOR]
- Abstract: Les aménagistes des ressources aquatiques sont continuellement confrontés à des propositions de constructions et de sites de développement, lesquelles, si elles sont autorisées, vont ultimement altérer la structure physique et la couverture des habitat des poissons. En absence de références quantitatives claires, liant le changement de l’habitat au poisson, les aménagistes des ressources utilisent souvent le changement de l’aire de l’habitat comme base de décisions. Afin d’évaluer le poids des preuves scientifiques supportant les décisions d’aménagement, les auteurs résument la littérature portant sur des observations aussi bien que des expérimentations. Ils ont ainsi relevé les données d’études expérimentales (lorsque possible) pour les inclure dans une méta-analyse, afin de produire une évaluation plus objective des résultats publiés sur les manipulations expérimentales d’habitats. Ils ont trouvé une preuve corrélationnelle forte et congrue reliant le poisson aux caractéristiques physiques de l’habitat, avec cependant une évidence incongrue lors d’une revue textuelle de la littérature expérimentale. Dans l’ensemble, des diminutions de la complexité de la structure des habitats sont néfastes à la diversité des poissons et peuvent changer la composition en espèces. Des augmentations de la complexité des structures montrent des augmentations, des diminutions ou aucun changement dans la composition en espèces ou dans les communautés. La majorité des résultats des méta-analyses conduites par les auteurs supportent un lien direct entre l’habitat et l’abondance ou la biomasse des poissons, la biomasse des poissons réagissant le plus fortement au changement de l’habitat. Les modifications d’habitat sont plus susceptibles d’affecter les espèces individuelles ou la structure des communautés, et ainsi, l’évaluation de l’importance des effets sur une base biologique dépend des objectifs d’aménagement. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Environmental Reviews is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Abstract:
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