Invertebrate community responses to experimentally reduced discharge in small streams of different water quality
| Autor: | Zoë S. Dewson, Russell G. Death, Alexander B. W. James |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Journal of the North American Benthological Society. 26:754-766 |
| ISSN: | 1937-237X 0887-3593 |
| DOI: | 10.1899/07-003r.1 |
| Popis: | Water abstraction can alter invertebrate community composition by changing the availability or suitability of habitat for invertebrates. The consequences of water abstraction for the physical habitat and invertebrate communities of small permanent streams are not clear. Therefore, we used whole-channel flow manipulations to imitate real water abstractions. We used weirs and diversions to reduce discharge by >85% in 3 small New Zealand streams (mean discharges: 11–84 L/s), ranging in water quality from pristine to moderately polluted. We sampled benthic invertebrates and periphyton at control and impact sites on each stream before and during 2 mo of artificially reduced discharge during summer 2005, and then we left the diversions in operation throughout the following year and sampled invertebrates again after 9 and 12 mo of flow reduction. During the experiment, wetted width decreased by 24 to 34% at impact sites. Water velocity and depth also decreased at impact sites, but only small changes to c... |
| Databáze: | OpenAIRE |
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