Journal article

Environmental change drives long-term recruitment and growth variation in an estuarine fish

John R Morrongiello, Chris T Walsh, Charles A Gray, Jerom R Stocks, David A Crook



How individuals respond to environmental change determines the strength and direction of biological processes like recruitment and growth that underpin population productivity. Ascertaining the relative importance of environmental factors can, however, be difficult given the numerous mechanisms through which they affect individuals. This is especially true in dynamic and complex estuarine environments. Here, we develop long-term otolith-based indices of recruitment and growth for estuary perch Percalates colonorum (Bemm River, Australia), to explore the importance of intrinsic (individual, demographic) and extrinsic (hydrologic, climatic, density-dependent) factors in driving estuarine fish ..

View full abstract

University of Melbourne Researchers


Funding Acknowledgements

We thank Mike Kirwan and Lyndsay Williams for collecting otoliths, the facilities at Cronulla Fisheries Research Centre of Excellence for sectioning and ageing otoliths and Helen Morrongiello, Ron Thresher and Rick Stoffels for providing valuable comments on earlier versions of this manuscript. JRM was supported by an OCE CSIRO Postdoctoral Fellowship and this study was supported by NSW Recreational Fishing Trust, in collaboration with NSW Department of Primary Industries. This project was conducted under Animal Care and Ethics Ref no. 03/06. The authors declare no conflict of interest.