Flow as a disturbance agent: fish responses to serial flooding in a hydrologically-variable dryland river system, Australia
Wilson, G. (2018). Flow as a disturbance agent: fish responses to serial flooding in a hydrologically-variable dryland river system, Australia. 5th European Congress of Conservation Biology. doi: 10.17011/conference/eccb2018/108200
Tekijät
Päivämäärä
2018Tekijänoikeudet
© the Authors, 2018
Lowland rivers are one of the most prominent freshwater ecosystems globally, yet are also one of the most imperiled from expanding human settlements, agriculture and water resources capture. Many countries are implementing environmental water programs to help offset the ecological impacts of human activities. While these rely on knowledge of ecological responses to flow variability, their strength lies in access to data from as wide a range of hydrologies as possible, and both natural and managed events.
I examined shifts in fish assemblage structure and recruitment across a lowland distributary network in Australia's northern Murray-Darling Basin. Sampling during 2011 and 2012 coincided with a small flow pulse followed by two large flood events. It was hypothesized that assemblage structure would vary significantly over time but that abundances of all common species would respond in a similar (positive) manner to flooding.
Assemblage structure varied substantially among sites at the beginning of the season, particularly following the initial, small managed release. However, assemblages had a far greater similarity following the two floods, although began to diverge again by winter. Native species displayed varying responses to the flood events in their recruit abundances. Juvenile carp gudgeons declined markedly in abundance after the first large flood and were absent following the second large flood. However, spangled perch (Leiopotherapon unicolor) and bony herring (Nematolosa erebi) showed a generally positive response to both floods in their recruitment. Recruit abundances for the exotic carp Cyprinus carpio) increased by up to 55,000% following the initial large flood, yet were nearly absent following the second flood. Size-structure data for the exotic goldfish (Carassius auratus) indicated a similar pattern to that of carp.
These findings confirm the general adaptation of indigenous aquatic species to local flow conditions, including highly variable discharge rates and large floods - albeit that species with a greater lentic preference (carp gudgeons) may be impacted by larger events. Further, they indicate the corresponding potential for a disconnect between exotic species and local climatic variability despite the broader colonisation success in these taxa.
Julkaisija
Open Science Centre, University of JyväskyläKonferenssi
ECCB2018: 5th European Congress of Conservation Biology. 12th - 15th of June 2018, Jyväskylä, Finland
Alkuperäislähde
https://peerageofscience.org/conference/eccb2018/108200/Metadata
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- ECCB 2018 [712]
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