"Stick with your own kind, or hang with the locals?' Implications of shoaling strategy for tropical reef fish on a range-expansion frontline

Smith, Shannen M., Fox, Rebecca J., Booth, David J., and Donelson, Jennifer M. (2018) "Stick with your own kind, or hang with the locals?' Implications of shoaling strategy for tropical reef fish on a range-expansion frontline. Global Change Biology, 24 (4). pp. 1663-1672.

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Range shifts of tropical marine species to temperate latitudes are predicted to increase as a consequence of climate change. To date, the research focus on climate-mediated range shifts has been predominately dealt with the physiological capacity of tropical species to cope with the thermal challenges imposed by temperate latitudes. Behavioural traits of individuals in the novel temperate environment have not previously been investigated, however, they are also likely to play a key role in determining the establishment success of individual species at the range-expansion forefront. The aim of this study was to investigate the effect of shoaling strategy on the performance of juvenile tropical reef fishes that recruit annually to temperate waters off the south east coast of Australia. Specifically, we compared body-size distributions and the seasonal decline in abundance through time of juvenile tropical fishes that shoaled with native temperate species (mixed' shoals) to those that shoaled only with conspecifics (as would be the case in their tropical range). We found that shoaling with temperate native species benefitted juvenile tropical reef fishes, with individuals in mixed' shoals attaining larger body-sizes over the season than those in tropical-only' shoals. This benefit in terms of population body-size distributions was accompanied by greater social cohesion of mixed' shoals across the season. Our results highlight the impact that sociality and behavioural plasticity are likely to play in determining the impact on native fish communities of climate-induced range expansion of coral reef fishes.

Item ID: 53417
Item Type: Article (Research - C1)
ISSN: 1365-2486
Keywords: behaviour, biological invasion, competition, coral reef fish, range-shift, social system, vagrant fish
Funders: University of Technology, Sydney (UTS)
Projects and Grants: UTS research award, UTS Ian Potter foundation science grant, UTS Chancellor's postdoctoral research fellowship
Date Deposited: 21 Mar 2018 07:31
FoR Codes: 31 BIOLOGICAL SCIENCES > 3199 Other biological sciences > 319902 Global change biology @ 40%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 20%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310301 Behavioural ecology @ 40%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960310 Global Effects of Climate Change and Variability (excl. Australia, New Zealand, Antarctica and the South Pacific) @ 100%
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