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The influence of freshwater flows on two estuarine resident fish species show differential sensitivity to the impacts of drought, flood and climate change

Citation

Williams, J and Hindell, JS and Jenkins, GP and Tracey, S and Hartmann, K and Swearer, SE, The influence of freshwater flows on two estuarine resident fish species show differential sensitivity to the impacts of drought, flood and climate change, Environmental Biology of Fishes, 100, (9) pp. 1121-1137. ISSN 0378-1909 (2017) [Refereed Article]

Copyright Statement

Copyright Springer Science+Business Media B.V. 2017

DOI: doi:10.1007/s10641-017-0632-z

Abstract

Estuaries are particularly susceptible to climate change and drought resulting in atypical changes to freshwater flows. How such changes in flow impact on the ecology of estuarine fishes may depend on how a species moves in response to changing flow conditions. Acoustic telemetry was used to interpret fine-scale movements of two co-inhabiting estuarine fish species, black bream, Acanthopagrus butcheri and estuary perch, Macquaria colonorum in relation to freshwater flows, season and moon phase. We found black bream to be highly mobile, regularly travelling the length of the estuary and into the neighbouring estuaries. In contrast, estuary perch had particular home ranges and made occasional, upstream or downstream movements. Possibly influenced by freshwater flows, estuary perch moved at greater rates in the Tambo compared to fish in the Mitchell. Black bream resided in the upper estuary during winter and spring and the lower estuary during summer and autumn, whereas estuary perch remained in the upper estuary throughout the year, with occasional downstream movements in winter and spring. This study revealed 1) significantly large increases in freshwater flows result in mass downstream movements in both species, 2) fish moved upstream during full moons and 3) there are contrasting spatio-temporal patterns in movement between species. The results from this study highlight that estuarine fishes are likely to show differential sensitivity to the impacts of drought and climate change and illustrate how acoustic telemetry methods can be used to determine the environmental needs of fishes and help efforts to conserve and manage estuaries worldwide.

Item Details

Item Type:Refereed Article
Keywords:telemetry, animal tracking, acoustic tracking, fish, estuaries, movement
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquatic Ecosystem Studies and Stock Assessment
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Fisheries - Recreational
Author:Tracey, S (Dr Sean Tracey)
Author:Hartmann, K (Dr Klaas Hartmann)
ID Code:117707
Year Published:2017
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2017-06-26
Last Modified:2017-12-13
Downloads:1 View Download Statistics

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