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A methodological approach to the use of terrestrial invertebrates for the assessment of alluvial wetlands
Authors:E Castella  M C D Speight  P Obrdlik  E Schneider  T Lavery
Institution:(1) WWF - Institute for Floodplain Ecology, Josefstrasse 1, D-76437 Rastatt, Germany;(2) Research Branch, National Parks and Wildlife Service, 51 St. Stephens Green, Dublin 2, Ireland;(3) Farnes. Castlemaine. Co., Kerry, Ireland;(4) Laboratoire d'Ecologie et de Biologie Aquatiques, Université de Genève, 18 chemin des Clochettes, CH -1206 Genève, Switzerland
Abstract:We review progress toward developing a data-analysis system using invertebrate species lists in wetland evaluation procedures. Species lists for Mollusca, Carabidae (Coleoptera), Empidoidea and Syrphidae (Diptera), derived from samples collected at six stations along a transect established at a site on the floodplain of the River Loire (France) provide the raw data. An initial analysis using a traditional ordination method (Correspondence Analysis) is carried out. A data base was established for the 118 mollusc, carabid and syrphid species recorded, and each species was then treated not as a simple integer, but as an amalgam of digitised attributes deemed responsive to wetland conditions, in a correspondence analysis on instrumental variables. Despite the generalized nature of the attributes as defined for this example, the approach demonstrates a marked increase in interpretability of the output of analysis, in respect of the relation between the species and the floodplain environment. It also highlights the value of use of data pertaining to more than one taxonomic group and of selecting these taxonomic groups on the basis of complementarity of their lsquobioindicatorrsquo potential.Corresponding Editor: J.T.A. Verhoeven
Keywords:Alluvial wetlands  Carabidae  ecological attributes  Empidoidea  instrumental variables  Loire River  Mollusca  ordination  site assessment  Syrphidae
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