A life-history account of Macrobrachium spinipes (Schenkel, 1902) (Cherabin) in a large tropical Australian River

Peter Novak, Michael Douglas, Erica Garcia, Peter Bayliss, Bradley J Pusey

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    Abstract

    Rivers in tropical Australia are largely pristine, and ecosystem connectivity is intact, but water resources in northern Australia are under increasing development pressure. A better understanding of the role and life histories of key migratory species is urgently needed to manage the risks posed by development. We investigated the life history of Macrobrachium spinipes (Schenkel, 1902) in the Daly River of the Northern Territory, Australia. We carried out a 13-mo trapping program (2011–2012) at 7 sites along the river between 92 and 405 km from the estuary. We provide the first detailed account of spatial and temporal changes in relative abundance and reproduction, and present information on length at first maturity and Fulton’s body condition factor. Reproduction was strongly seasonal and was restricted to the wet-season months of November to April, followed by a recruitment pulse 3 to 4 mo later during the early dry season. Length at first maturity declined as the reproductive season progressed but did not vary significantly with distance from the estuary. Condition was temporally variable and peaked for both sexes immediately after the wet season before declining throughout the dry season. Relative abundance patterns followed a similar pattern. Contrary to results for other Macrobrachium species in rivers of comparable length, we found an increase in the relative abundance of females throughout the river’s length during the reproductive season and reproductive effort occurring far upstream, over a restricted time period. This result highlights the importance of maintaining connectivity for reproductive success of this species and further recruitment into these upstream reaches.
    Original languageEnglish
    Pages (from-to)620-633
    Number of pages14
    JournalFreshwater Science
    Volume34
    Issue number2
    DOIs
    Publication statusPublished - Jun 2015

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    Macrobrachium
    life history
    rivers
    relative abundance
    river
    wet season
    dry season
    connectivity
    breeding season
    estuaries
    estuary
    migratory species
    Northern Territory
    reproductive effort
    condition factor
    body condition
    water resources
    reproductive success
    trapping
    water resource

    Cite this

    Novak, Peter ; Douglas, Michael ; Garcia, Erica ; Bayliss, Peter ; Pusey, Bradley J. / A life-history account of Macrobrachium spinipes (Schenkel, 1902) (Cherabin) in a large tropical Australian River. In: Freshwater Science. 2015 ; Vol. 34, No. 2. pp. 620-633.
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    A life-history account of Macrobrachium spinipes (Schenkel, 1902) (Cherabin) in a large tropical Australian River. / Novak, Peter; Douglas, Michael; Garcia, Erica; Bayliss, Peter; Pusey, Bradley J.

    In: Freshwater Science, Vol. 34, No. 2, 06.2015, p. 620-633.

    Research output: Contribution to journalArticleResearchpeer-review

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