DSpace
 
  Repositório Institucional da Universidade de Aveiro > Departamento de Biologia > BIO - Artigos >
 The effects of small-scale impoundments and bank reinforcing on fish habitat and composition in semi-natural streams
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5505

title: The effects of small-scale impoundments and bank reinforcing on fish habitat and composition in semi-natural streams
authors: Monaghan, Kieran A.
Fonseca, Miguel M.
Domingues, Inês
Soares, Amadeu M. V. M.
keywords: Streams
Fish
Community
Structure
River habitat
Least-impacted
Channel management
issue date: 2008
publisher: Publishing Office of Institute of Ecology
abstract: We studied the fish assemblages of thirty one, 2(nd)-4(th) order "least- impacted" streams with a varying degree of low-level management in central Portugal, using a standardised survey to document the river habitat. Channel, banks and riparian landuse, described separately according to principal component scores, were significantly related to altitude, slope and management intervention. Species diversity was low, represented by four endemic, four pan-European and one exotic species. TWINSPAN classification distinguished 3 community types, characterised by their dominant species: trout (Salmo trutta L.), chub (Leuciscus carolitertii Doadrio) and "roach" (Squalius alburnoides Steindachner and Chondrostoma oligolepis Robalo). Community types were associated with environmental differences with PC Channel scores higher at trout sites compared to other classification groups, whilst PC Bank-1 scores, temperature and conductivity were significantly different at trout compared to "roach" sites. Ecologically important habitat features were, in turn, related to landscape (map-derived) parameters and the extent of channel and bank management. The mis-classification of sites in discriminant analysis was related to management intervention, indicating the potential difficulty in the assignment river-community types for the biological monitoring of fish communities in these stream types.
URI: http://hdl.handle.net/10773/5505
ISSN: 1505-2249
publisher version/DOI: http://www.pol.j.ecol.cbe-pan.pl/
source: Polish Journal of Ecology
appears in collectionsBIO - Artigos

files in this item

file description sizeformat
165-PolishJEcol_2008_56_647.pdf332.85 kBAdobe PDFview/open
statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! RCAAP OpenAIRE DeGóis
ria-repositorio@ua.pt - Copyright ©   Universidade de Aveiro - RIA Statistics - Powered by MIT's DSpace software, Version 1.6.2