Fish community structure in an intermittent river: the importance of environmental stability, landscape factors and within-pool habitat descriptors
L. S. Beesley A B C and J. Prince AA School of Animal Biology, The University of Western Australia, Crawley, WA 6009, Australia.
B Present address: Freshwater Ecology, The Arthur Rylah Institute for Environmental Research, Department of Sustainability and Environment, Heidelberg, Vic 3084, Australia.
C Corresponding author. Email: leah.beesley@dse.vic.gov.au
Marine and Freshwater Research 61(5) 605-614 https://doi.org/10.1071/MF09137
Submitted: 11 June 2009 Accepted: 17 November 2009 Published: 28 May 2010
Abstract
In rivers worldwide, hydrological persistence and variability (i.e. environmental stability) typically parallel longitudinal changes in habitat. This interaction complicates determination of the hierarchy of mechanisms that structure fish communities along rivers. In this study, we examined fish species richness and presence–absence in pools of an intermittent river system containing underground water storages (Fortescue River, north-west Australia), a system that was predicted to uncouple this relationship. Stability, measured by pool persistence, was unrelated to a pool's maximum depth or its position in the catchment, indicating partial decoupling. However, pool stability remained correlated with habitat diversity and log-transformed surface area. Model selection indicated that species richness was better described by pool stability and the landscape factor stream order than by within-pool habitat descriptors. Permanent pools low in the catchment contained more species than unstable pools in headwater streams. We conclude that the distribution of fish in the Fortescue River is shaped predominantly by processes of extirpation and re-colonisation. Management efforts in this river and similar intermittent systems should focus on the preservation of refuge pools, and limit the construction of barriers that limit dispersal.
Additional keywords: assemblage organisation, dispersal, extinction/re-colonisation, hydroperiod, Pilbara, stream.
Acknowledgements
This research was part of a doctoral dissertation carried out at the School of Animal Biology (formerly Zoology) at the University of Western Australia (UWA). Funding was provided principally by Land and Water Australia. The River Basin Management Society also kindly contributed. We thank Peter M. Davies (UWA), Peter Kendrick (Department of Environment and Conservation) and Mark Meekan (Australian Institute of Marine Science) for their supervision; and thank Isaac Schlosser, Kirk Winemiller and William Matthews for their critical appraisal of this research when it was in thesis format. We also thank Andrew Boulton and two anonymous reviewers whose constructive comments improved the manuscript. This research was carried out under animal ethics approval, AEC #00/100/080.
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