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dc.contributor.authorMbaka, John Gichimu
dc.contributor.authorMwaniki, Mercy Wanjiru
dc.date.accessioned2019-05-13T07:22:13Z
dc.date.available2019-05-13T07:22:13Z
dc.date.issued2015
dc.identifier.urihttp://ir.mksu.ac.ke/handle/123456780/4426
dc.description.abstractThe downstream ecological effects of large impoundments have previously been reviewed; however, little is known about the downstream ecological effects of small man-made impoundments. In this review, we examine 94 papers focusing on theeffectsofsmallimpoundmentsonstreamhabitatconditionsandmacroinvertebrates.Moststudies(89.3%)address the effects of small impoundments on physical and chemical habitat conditions, while fewer studies (48.9%) address the effects on macroinvertebrates. In general, most studies report no significant downstream effects of small impoundments on physico-chemical variables, whereas macroinvertebrates richness and abundance increased or decreased. Mean effect sizes (as Cohen’s d) for physico-chemical variables range from −0.82 to 0.68 (small weir: −0.21 to 0.35; run-of-river dam: −0.82 to 0.64; low head dam: −0.49 to 0.68),and from−0.03to0.63formacroinvertebratesabundanceandrichness.Ourassessmentofthepublishedliterature demonstratestheadvantageofcombiningqualitativeandquantitativeanalyses,and that,while small impoundments may have minimal significant effects on most physico-chemical variables,macroinvertebrates’richness and density may be affected.This review is relevant for management and scientific communities to identify potential alterations of stream habitats and biota by small impoundmentsen_US
dc.language.isoen_USen_US
dc.publisherNRC Research Pressen_US
dc.subjectImpoundmentsen_US
dc.subjectStream invertebratesen_US
dc.subjectRiveren_US
dc.subjectEnvironmenten_US
dc.subjectEcological effectsen_US
dc.subjectPhysico-chemical variablesen_US
dc.titleA global review of the downstream effects of small impoundments on stream habitat conditions and macroinvertebratesen_US
dc.typeArticleen_US


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