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Long-term shifts in abundance and distribution of a temperate fish fauna: a response to climate change and fishing practices

Authors

  • Peter R. Last,

    Corresponding author
    1. Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia,
    2. Wealth from Oceans Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia,
      Peter Last, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia.
      E-mail: peter.last@csiro.au
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  • William T. White,

    1. Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia,
    2. Wealth from Oceans Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia,
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  • Daniel C. Gledhill,

    1. Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia,
    2. Wealth from Oceans Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia,
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  • Alistair J. Hobday,

    1. Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia,
    2. Wealth from Oceans Flagship, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia,
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  • Rebecca Brown,

    1. Tasmanian Aquaculture and Fisheries Institute, Private Bag 49, Hobart TAS 7001, Australia
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  • Graham J. Edgar,

    1. Tasmanian Aquaculture and Fisheries Institute, Private Bag 49, Hobart TAS 7001, Australia
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  • Gretta Pecl

    1. Tasmanian Aquaculture and Fisheries Institute, Private Bag 49, Hobart TAS 7001, Australia
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Peter Last, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart TAS 7001, Australia.
E-mail: peter.last@csiro.au

ABSTRACT

Aim  South-eastern Australia is a climate change hotspot with well-documented recent changes in its physical marine environment. The impact on and temporal responses of the biota to change are less well understood, but appear to be due to influences of climate, as well as the non-climate related past and continuing human impacts. We attempt to resolve the agents of change by examining major temporal and distributional shifts in the fish fauna and making a tentative attribution of causal factors.

Location  Temperate seas of south-eastern Australia.

Methods  Mixed data sources synthesized from published accounts, scientific surveys, spearfishing and angling competitions, commercial catches and underwater photographic records, from the ‘late 1800s’ to the ‘present’, were examined to determine shifts in coastal fish distributions.

Results  Forty-five species, representing 27 families (about 30% of the inshore fish families occurring in the region), exhibited major distributional shifts thought to be climate related. These are distributed across the following categories: species previously rare or unlisted (12), with expanded ranges (23) and/or abundance increases (30), expanded populations in south-eastern Tasmania (16) and extra-limital vagrants (4). Another 9 species, representing 7 families, experienced longer-term changes (since the 1800s) probably due to anthropogenic factors, such as habitat alteration and fishing pressure: species now extinct locally (3), recovering (3), threatened (2) or with remnant populations (1). One species is a temporary resident periodically recruited from New Zealand. Of fishes exhibiting an obvious poleward movement, most are reef dwellers from three Australian biogeographic categories: widespread southern, western warm temperate (Flindersian) or eastern warm temperate (Peronian) species.

Main conclusions  Some of the region's largest predatory reef fishes have become extinct in Tasmanian seas since the ‘late 1800s’, most likely as a result of poor fishing practices. In more recent times, there have been major changes in the distribution patterns of Tasmanian fishes that correspond to dramatic warming observed in the local marine environment.

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