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tile relationship between hydromorphology and macrophyte community structure in uk-implications for ecological assessment

TIlE RELATIONSHIP BETWEEN HYDROMORPHOLOGY AND MACROPHYTE COM...

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第三世界生态高峰会

作者： RITA S.W.YAM MATTIE O'HARE MIKE DUNBAR ANNETTE BAATTRUP-PEDERSEN S REN E.LARSEN Centre for Ecology & Hydrology Macleam Builling Crowmarsh Gifford Wallingford Oxfordshire OX10 8BB.U.K. Centre for Ecology & Hydrology Winfrith Technology Centre Dorchester.DT2 8ZD Dorset U.K. Centre for Ecology & Hydrology Maclean Building Crowmarsh Gifford Wallingford.Oxfordshire OX10 8BB.U.K. Department of Freshwater Biology National Environmental Research Institute VejlsΦvej 25 P.O.Box 314 DK-8600 Silkeborg.Denmark. Department of Freshwater Biology National Environmental Research Institute VejlsΦvej 25 P.O.Box 314 DK-8600 Silkeborg.Denmark.

We investigated the quantitative relationship between macrophyte community structure and hydromorphology in 648 rivers in the United Kingdom （uk）.Geographical information,geological features,channel morphology,flow pattern and degree of habitat modification were included to characterize the hydromorphology at each *** analysis,partial least squares projection to latent structures （PLS）, revealed a positive correlation between floristic （abundance and species richness） and hydromorphological variables （p＜0.005）.Depth of channel,substrate type and flow habitat type played significant roles on shaping the community structure of *** communities varied between the gradient of two main types of sites: type 1 was characterised by small-sized mountain rivers with variable flow regime whereas type 2 was characterised by large-sized lowland rivers with deeper and wider channel,and higher and more stable flows Dominant species differ between unimpacted and impacted rivers （defined in term of habitat modification and eutrophication）.Seventeen macrophyte species were identified as indicators for different hydromorphological environments in *** these indicator species,submerged and emergent species were dominant over （＞40%） amphibious *** PLS model is sufficiently sensitive （cross validation:Q＞0.4,p＜0.05） to be used in the management of river macrophyte *** can predict the macrophyte communities from hydromorphological variables in rivers,and assess the ecological impacts into five classes based on the ordinal measure of *** impact of physical alteration on macrophyte communities can therefore be quantified from the *** implications of this work on monitoring river health are discussed.

关键词： tile relationship between hydromorphology and macrophyte community structure in uk-implications for ecological assessment

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