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dc.contributor.authorRolls, Robert J
dc.contributor.authorLeigh, Catherine
dc.contributor.authorSheldon, Fran
dc.date.accessioned2017-05-03T15:40:22Z
dc.date.available2017-05-03T15:40:22Z
dc.date.issued2012
dc.date.modified2013-06-17T02:53:33Z
dc.identifier.issn2161-9549
dc.identifier.doi10.1899/12-002.1
dc.identifier.urihttp://hdl.handle.net/10072/48539
dc.description.abstractAlterations to the natural flow regime affect the structure and function of rivers and wetlands and contribute to loss of biodiversity worldwide. Although the effects of flow regulation have been relatively well studied, a lack of synthesis of the ecological consequences of low flows and droughts impedes research progress and our grasp of the mechanistic effects of human-induced water reductions on riverine ecosystems. We identified 6 ecologically relevant hydrological attributes of low flow (antecedent conditions, duration, magnitude, timing and seasonality, rate of change, and frequency) that act within the temporal hierarchy of the flow regime and a spatial context. We synthesized the literature to propose 4 principles that outline the mechanistic links between these low-flow attributes and the processes and patterns within riverine ecosystems. First, low flows control the extent of physical aquatic habitat, thereby affecting the composition of biota, trophic structure, and carrying capacity. Second, low flows mediate changes in habitat conditions and water quality, which in turn, drive patterns of distribution and recruitment of biota. Third, low flows affect sources and exchange of material and energy in riverine ecosystems, thereby affecting ecosystem production and biotic composition. Last, low flows restrict connectivity and diversity of habitat, thereby increasing the importance of refugia and driving multiscale patterns in biotic diversity. These principles do not operate in isolation, and many of the ecological pathways that are affected by low flows are likely to overlap or occur simultaneously, potentially resulting in synergistic and complex effects. Last, we outlined major human-induced threats to low-flow hydrology and how they act upon the ecologically relevant hydrological attributes of low flow to affect potential changes in riverine ecosystem integrity. The mechanistic links described in this synthesis can be used to develop and test hypotheses of low-flow hydrological-ecological response relationships in a cause-effect framework that will have value for both research and river flow management. Continued experimental research and ongoing consolidation of ecological information will improve our understanding and ability to predict consequences of low-flow alteration on river, floodplain, and estuarine ecosystems.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent879766 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Chicago Press
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom1163
dc.relation.ispartofpageto1186
dc.relation.ispartofissue4
dc.relation.ispartofjournalFreshwater Science
dc.relation.ispartofvolume31
dc.rights.retentionY
dc.subject.fieldofresearchFreshwater Ecology
dc.subject.fieldofresearchEcology
dc.subject.fieldofresearchOther Biological Sciences
dc.subject.fieldofresearchcode060204
dc.subject.fieldofresearchcode0602
dc.subject.fieldofresearchcode0699
dc.titleMechanistic effects of low-flow hydrology on riverine ecosystems: ecological principles and consequences of alteration
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
gro.rights.copyright© 2012 North American Benthological Society. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.date.issued2012
gro.hasfulltextFull Text
gro.griffith.authorSheldon, Fran
gro.griffith.authorLeigh, Catherine
gro.griffith.authorRolls, Rob J.


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