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  • Fish diet composition in floodplain lagoons of an Australian dryland river in relation to an extended dry period following flooding

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    89714_1.pdf (226.8Kb)
    Author(s)
    Medeiros, Elvio SF
    Arthington, Angela H
    Griffith University Author(s)
    Arthington, Angela H.
    Year published
    2014
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    Abstract
    Floodplain rivers worldwide are threatened by loss of connectivity to their floodplains and hence reduced benefits from floodplain energy subsidies. Dryland rivers with 'boom and bust' ecological responses to flooding and extended dry periods may be particularly vulnerable. This paper describes variations in dietary composition of three fish species of contrasting trophic position in dryland floodplain lagoons with variable flood inundation and drying histories. The study species were Ambassis agassizii - a microphagic carnivore, Leiopotherapon unicolor - a carnivore/omnivore, and Nematalosa erebi - an algivore/detritivor. ...
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    Floodplain rivers worldwide are threatened by loss of connectivity to their floodplains and hence reduced benefits from floodplain energy subsidies. Dryland rivers with 'boom and bust' ecological responses to flooding and extended dry periods may be particularly vulnerable. This paper describes variations in dietary composition of three fish species of contrasting trophic position in dryland floodplain lagoons with variable flood inundation and drying histories. The study species were Ambassis agassizii - a microphagic carnivore, Leiopotherapon unicolor - a carnivore/omnivore, and Nematalosa erebi - an algivore/detritivor. Despite the range of food items recorded in fish guts, each species fed mostly on relatively few food categories and few food items within each category. Most of the spatial (i.e. among lagoons) and temporal dietary variation was associated with different proportional contributions of these food items. Given the absence or low magnitude of flooding during the study period, temporal changes in diets of the three species are probably the result of successional changes in composition of invertebrate prey as the dry season progressed. The focus of each fish species on relatively few food categories and a few reliable food items within each category may be the most profitable foraging strategy when food resources are limiting in progressively drying floodplain lagoons.
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    Journal Title
    Environmental Biology of Fishes
    Volume
    97
    Issue
    7
    DOI
    https://doi.org/10.1007/s10641-013-0180-0
    Copyright Statement
    © 2013 Springer Netherlands. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. The original publication is available at www.springerlink.com
    Subject
    Environmental assessment and monitoring
    Ecology
    Zoology
    Fisheries sciences
    Publication URI
    http://hdl.handle.net/10072/56247
    Collection
    • Journal articles

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