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Long-term patterns in estuarine fish growth across two climatically divergent regions

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posted on 2023-05-18, 12:14 authored by Doubleday, ZA, Izzo, C, James Haddy, Jeremy LyleJeremy Lyle, Ye, Q, Gillanders, BM
Long-term ecological datasets are vital for investigating how species respond to changes in their environment, yet there is a critical lack of such datasets from aquatic systems. We developed otolith growth ‘chronologies’ to reconstruct the growth history of a temperate estuarine fish species, black bream (Acanthopagrus butcheri). Chronologies represented two regions in south-east Australia: South Australia, characterised by a relatively warm, dry climate, and Tasmania, characterised by a relatively cool, wet climate. Using a mixed modelling approach, we related inter-annual growth variation to air temperature, rainfall, freshwater inflow (South Australia only), and El Niño–Southern Oscillation events. Otolith chronologies provided a continuous record of growth over a 13- and 21-year period for fish from South Australia and Tasmania, respectively. Even though fish from Tasmania were sourced across multiple estuaries, they showed higher levels of growth synchronicity across years, and greater year-to-year growth variation, than fish from South Australia, which were sourced from a single, large estuary. Growth in Tasmanian fish declined markedly over the time period studied and was negatively correlated to temperature. In contrast, growth in South Australian fish was positively correlated to both temperature and rainfall. The stark contrast between the two regions suggests that Tasmanian black bream populations are more responsive to regional scale environmental variation and may be more vulnerable to global warming. This study highlights the importance of examining species response to climate change at the intra-specific level and further validates the emerging use of growth chronologies for generating long-term ecological data in aquatic systems.

History

Publication title

Oecologia

Volume

179

Issue

4

Pagination

1079-1090

ISSN

0029-8549

Department/School

Institute for Marine and Antarctic Studies

Publisher

Springer-Verlag

Place of publication

175 Fifth Ave, New York, USA, Ny, 10010

Rights statement

© 2015 Springer-Verlag This is a post-peer-review, pre-copyedit version of an article published in Oecologia. The final authenticated version is available online at: http://dx.doi.org/10.1007/s00442-015-3411-6

Repository Status

  • Open

Socio-economic Objectives

Fisheries - aquaculture not elsewhere classified

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