Arid
DOI10.1890/07-0886.1
Experimental floods cause ecosystem regime shift in a regulated river
Robinson, Christopher T.1; Uehlinger, Urs2
通讯作者Robinson, Christopher T.
来源期刊ECOLOGICAL APPLICATIONS
ISSN1051-0761
EISSN1939-5582
出版年2008
卷号18期号:2页码:511-526
英文摘要

Reservoirs have altered the flow regime of most rivers on the globe. To simulate the natural flow regime, experimental foods are being implemented on regulated rivers throughout the world to improve their ecological integrity. As a large-scale disturbance, the long-term sequential use of floods provides an excellent empirical approach to examine ecosystem regime shifts in rivers. This study evaluated the long-term effects of floods (15 floods over eight years) on a regulated river. We hypothesized that sequential floods over time would cause a regime shift in the ecosystem. The floods resulted in little change in the physicochemistry of the river, although particulate organic carbon and particulate phosphorus were lower after the floods. The floods eliminated moss cover on bed sediments within the first year of flooding and maintained low periphyton biomass and benthic organic matter after the third year of flooding. Organic matter in transport was reduced after the third year of flooding, although peaks were still observed during rain events due to tributary inputs and side slopes. The floods reduced macroinvertebrate richness and biomass after the. rst year of floods, but density was not reduced until the third year. The individual mass of invertebrates decreased by about one-half after the floods. Specific taxa displayed either a loss in abundance, or an increase in abundance, or an increase followed by a loss after the third year. The. rst three flood years were periods of nonequilibrium with coefficients of variation in all measured parameters increasing two to five times from those before the floods. Coefficients of variation decreased after the third year, although they were still higher than before the floods. Analysis of concordance using Kendall’s W confirmed the temporal changes observed in macroinvertebrate assemblage structure. An assessment of individual flood effects showed that later floods had similar to 30% less effect on macroinvertebrates than early floods of similar magnitude, suggesting that the new assemblage structure is more resilient to flood disturbance. We conclude that the floods caused an ecosystem regime shift that took three years to unfold. Additional long-term changes or shifts are expected as new taxa colonize the river from other sources.


英文关键词ecosystem regime shift experimental flooding flood disturbance resilience or resistance macroinvertebrates river flow regime temporal scale
类型Article
语种英语
国家Switzerland
收录类别SCI-E
WOS记录号WOS:000255437400017
WOS关键词SWISS-NATIONAL-PARK ; PREALPINE RIVER ; STABLE STATES ; MACROINVERTEBRATE COMMUNITIES ; DISTURBANCE REGIME ; EMERGING SCIENCE ; DESERT STREAM ; FOOD WEBS ; FLOW ; PERIPHYTON
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/157040
作者单位1.EAWAG, Dept Aquat Ecol, CH-8600 Dubendorf, Switzerland;
2.ETH, Inst Integrat Biol, CH-8092 Zurich, Switzerland
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GB/T 7714
Robinson, Christopher T.,Uehlinger, Urs. Experimental floods cause ecosystem regime shift in a regulated river[J],2008,18(2):511-526.
APA Robinson, Christopher T.,&Uehlinger, Urs.(2008).Experimental floods cause ecosystem regime shift in a regulated river.ECOLOGICAL APPLICATIONS,18(2),511-526.
MLA Robinson, Christopher T.,et al."Experimental floods cause ecosystem regime shift in a regulated river".ECOLOGICAL APPLICATIONS 18.2(2008):511-526.
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