Multiscale effects of flow regime and habitat and their interaction on fish assemblage structure in eastern Australia

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Title Multiscale effects of flow regime and habitat and their interaction on fish assemblage structure in eastern Australia
Author Kennard, Mark James; Olden, Julian D.; Arthington, Angela; Pusey, Bradley James; Poff, N. LeRoy
Journal Name Canadian Journal of Fisheries and Aquatic Sciences
Year Published 2007
Place of publication Ottawa, Canada
Publisher National Research Council Canada
Abstract We examine the multiscale influence of environmental and hydrological features of the riverine landscape on spatial and temporal variation in fish assemblages in eastern Australia. Multiresponse artificial neural network models provided accurate predictions of fish assemblages in the Mary River based on species presence–absence data (mean Bray–Curtis similarity between predicted and observed composition = 84%) but were less accurate when based on species relative abundance or biomass (mean similarity = 62% and 59%, respectively). Landscape- and local-scale habitat variables (e.g., catchment area and riparian canopy cover) and characteristics of the long-term flow regime (e.g., variability and predictability of flows) were more important predictors of fish assemblages than variables describing the short-term history of hydrological events. The relative importance of these variables was broadly similar for predicting species occurrence, relative abundance, or biomass. The transferability of the Mary River predictive models to the nearby Albert River was high for species presence–absence (i.e., closer match between predicted and observed data) compared with species abundances or biomass. This suggests that the same landscape-scale features are important determinants of distribution of individual species in both rivers but that interactions between landscape, hydrology, and local habitat features that collectively determine abundance and biomass may differ.
Peer Reviewed Yes
Published Yes
Publisher URI http://pubs.nrc-cnrc.gc.ca/
Alternative URI http://dx.doi.org/10.1139/F07-108
Copyright Statement Copyright 2007 National Research Council of Canada. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal link for access to the definitive, published version.
Volume 64
Page from 1346
Page to 1359
ISSN 0706-652X
Date Accessioned 2008-03-07
Language en_AU
Research Centre Australian Rivers Institute
Faculty Faculty of Science, Environment, Engineering and Technology
Subject PRE2009-Freshwater Ecology
URI http://hdl.handle.net/10072/17623
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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