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Atypical correlation of otolith strontium : Calcium and barium: Calcium across a marine-freshwater life history transition of a diadromous fish

Hamer, Paul, Henderson, Angela, Hutchison, Michael, Kemp, Jodie, Green, Corey and Feutry, Pierre (2015). Atypical correlation of otolith strontium : Calcium and barium: Calcium across a marine-freshwater life history transition of a diadromous fish. Marine and Freshwater Research,66(5):411-419.

Document type: Journal Article
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IRMA ID 84376995xPUB121
Title Atypical correlation of otolith strontium : Calcium and barium: Calcium across a marine-freshwater life history transition of a diadromous fish
Author Hamer, Paul
Henderson, Angela
Hutchison, Michael
Kemp, Jodie
Green, Corey
Feutry, Pierre
Journal Name Marine and Freshwater Research
Publication Date 2015
Volume Number 66
Issue Number 5
ISSN 1323-1650   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84928746722
Start Page 411
End Page 419
Total Pages 9
Place of Publication Australia
Publisher C S I R O Publishing
Field of Research 0704 - Fisheries Sciences
HERDC Category C1 - Journal Article (DIISR)
Abstract Variation in strontium (Sr) and barium (Ba) within otoliths is invaluable to studies of fish diadromy. Typically, otolith Sr : Ca is positively related to salinity, and the ratios of Ba and Sr to calcium (Ca) vary in opposite directions in relation to salinity. In this study of jungle perch, Kuhlia rupestris, otolith Sr : Ca and Ba : Ca, however, showed the same rapid increase as late-larval stages transitioned directly from a marine to freshwater environment. This transition was indicated by a microstructural check mark on otoliths at 35–45 days age. As expected ambient Sr was lower in the fresh than the marine water, however, low Ca levels (0.4 mg L–1) of the freshwater resulted in the Sr : Ca being substantially higher than the marine water. Importantly, the otolith Sr : Ba ratio showed the expected pattern of a decrease from the marine to freshwater stage, illustrating that Sr : Ba provided a more reliable inference of diadromous behaviour based on prior expectations of their relationship to salinity, than did Sr : Ca. The results demonstrate that Ca variation in freshwaters can potentially be an important influence on otolith element : Ca ratios and that inferences of marine–freshwater habitat use from otolith Sr : Ca alone can be problematic without an understanding of water chemistry.
Keywords catadromy
jungle perch
Kuhlia rupestris
larval dispersal
laser ablation
DOI http://dx.doi.org/10.1071/MF14001   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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