Estuarine movements in a sparid hybrid complex
Dylan E. van der Meulen
A B * , Chris T. Walsh A , Ivars V. Reinfelds C , Nicholas L. Payne B D , Matthew C. Ives E , David G. Roberts F G , James R. Craig H , Charles A. Gray B I and Matthew D. Taylor B J
+ Author Affiliations
- Author Affiliations
A NSW Department of Primary Industries, Batemans Bay Fisheries Centre, PO Box 17, Batemans Bay, NSW 2536, Australia.
B School of Biological, Earth and Environmental Science, University of New South Wales, Sydney, NSW 2052, Australia.
C NSW Department of Planning and Environment, Locked Bag 5022, Parramatta, NSW 2124, Australia.
D School of Natural Sciences, Trinity College Dublin, The University of Dublin, Dublin, Ireland.
E Institute for New Economic Thinking, University of Oxford, Manor Road Building, Manor Road, Oxford, UK.
F Formerly of: Kings Park and Botanic Garden, Botanic Gardens and Parks Authority, Fraser Avenue, Kings Park, WA 6005, Australia.
G Formerly of: Centre of Excellence in Natural Resource Management and School of Plant Biology, University of Western Australia, 35 Stirling Terrace, Albany, WA 6330, Australia.
H NSW Department of Primary Industries, Sydney Institute of Marine Science, Mosman, NSW 2088, Australia.
I WildFish Research, Grays Point, NSW 2232, Australia.
J NSW Department of Primary Industries, Port Stephens Fisheries Institute, Locked Bag 1, Nelson Bay, NSW 2315, Australia.
Marine and Freshwater Research 74(7) 625-640 https://doi.org/10.1071/MF22189
Submitted: 13 September 2022 Accepted: 21 March 2023 Published: 24 April 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Movements of purebred and hybrid complexes of species show the interactions that facilitate hybridisation and genetic introgression.
Aims: This study combines genetic analysis of Acanthopagrus spp. and acoustic tracking to understand the spatial ecology of this species complex.
Methods: Acanthopagrus australis (yellowfin bream) and the Acanthopagrus hybrid complex of A. australis and Acanthopagrus butcheri (black bream) were tracked using acoustic telemetry within a south-eastern Australian estuary.
Key results: Movements between A. australis and Acanthopagrus hybrids showed similarities, fish displayed high levels of residency and site fidelity, with peak distributions occurring 15 and 32 km upstream of the river entrance. Offshore movements were recorded for 43% of A. australis and 38% of Acanthopagrus spp. hybrids where fish did not return to the study estuary. Estuarine movement patterns in A. australis and A. spp. hybrids were significantly related to conductivity, freshwater flow, temperature, genetic classification, and capture location. Repetitive spawning migrations were not observed for either A. australis or A. spp. hybrids. Overlap in distributions throughout the spawning period did occur.
Conclusions: This study highlighted the complexity of estuarine movement patterns in A. australis and Acanthopagrus hybrids because they appear to be dependent on freshwater flow, temperature, and ancestry.
Implications: A. australis and A. spp. hybrids may be capable of spawning within estuaries, and adult offshore movements may play a role in the genetic mixing of populations.
Keywords: acoustic tracking, capture location, freshwater flows, home range, hybrid, intra-estuarine, introgression, movement ecology.
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