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dc.contributorVirginia Tech
dc.contributor.authorBurcher, C. L.
dc.contributor.authorValett, H. M.
dc.contributor.authorBenfield, E. F.
dc.date.accessioned2014-01-10T20:07:55Z
dc.date.available2014-01-10T20:07:55Z
dc.date.issued2007-01
dc.identifier.citationC. L. Burcher, H. M. Valett, and E. F. Benfield 2007. THE LAND-COVER CASCADE: RELATIONSHIPS COUPLING LAND AND WATER. Ecology 88:228–242. http://dx.doi.org/10.1890/0012-9658(2007)88[228:TLCRCL]2.0.CO;2
dc.identifier.issn0012-9658
dc.identifier.urihttp://hdl.handle.net/10919/24800
dc.description.abstractWe introduce the land-cover cascade ( LCC) as a conceptual framework to quantify the transfer of land-cover-disturbance effects to stream biota. We hypothesize that disturbance is propagated through multivariate systems through key variables that transform a disturbance and pass a reorganized disturbance effect to the next hierarchical level where the process repeats until ultimately affecting biota. We measured 31 hydrologic, geomorphic, erosional, and substrate variables and 26 biotic responses that have been associated with land-use disturbance in third- and fourth-order streams in the Blue Ridge physiographic province in western North Carolina ( USA). Regression analyses reduced this set of variables to include only those that responded to land cover and/or affected biota. From this reduced variable set, hypotheses were generated that predicted the disturbance pathways affecting each biotic response following the land-cover-cascade design. Cascade pathways began with land cover and ended with biotic responses, passing through at least one intermediate ecosystem abiotic component. Cascade models were tested for predictive ability and goodness-of-fit using path analysis. Biota were influenced by near-stream urban, agricultural, and forest land cover as propagated by hydrologic ( e. g., discharge), geomorphic ( e. g., stream bank height), erosional ( e. g., suspended sediments), and depositional streambed ( e. g., substrate size) features occurring along LCC pathways, reflecting abiotic mechanisms mediating land-cover disturbance. Our results suggest that communities are influenced by land-cover change indirectly through a hierarchy of associated abiotic components that propagate disturbance to biota. More generally, the land-cover cascade concept and experimental framework demonstrate an organized approach to the generic study of cascades and the complex relationships between landscapes and streams.
dc.language.isoen_US
dc.publisherEcological Society of America
dc.subjectdisturbance
dc.subjectgeomorphology
dc.subjectGIS
dc.subjecthydrology
dc.subjectland-cover cascade
dc.subjectsediment
dc.subjectwatershed
dc.subjectmultiple spatial scales
dc.subjectappalachian streams
dc.subjectcommunity structure
dc.subjectriver
dc.subjectcontinuum
dc.subjectfish
dc.subjecthabitat
dc.subjectmacroinvertebrates
dc.subjecturbanization
dc.subjectsediment
dc.subjectusa
dc.subjectEnvironmental Sciences & Ecology
dc.titleThe land-cover cascade: Relationships coupling land and water
dc.typeArticle - Refereed
dc.identifier.urlhttp://www.esajournals.org/doi/pdf/10.1890/0012-9658%282007%2988%5B228%3ATLCRCL%5D2.0.CO%3B2
dc.date.accessed2014-01-08
dc.title.serialEcology
dc.identifier.doihttps://doi.org/10.1890/0012-9658(2007)88[228:tlcrcl]2.0.co;2


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