Variation in stable isotope (δ18O and δ13C) signatures in the sagittal otolith carbonate of king threadfin, Polydactylus macrochir across northern Australia reveals multifaceted stock structure

Newman, Stephen J., Allsop, Quentin, Ballagh, Aaron C., Garrett, Rod N., Gribble, Neil, Meeuwig, Jessica J., Mitsopoulos, Gabby E.A., Moore, Bradley R., Pember, Matthew B., Rome, Ben M., Saunders, Thor, Skepper, Craig L., Stapley, Jason M., van Herwerden, Lynne and Welch, David J. (2010) Variation in stable isotope (δ18O and δ13C) signatures in the sagittal otolith carbonate of king threadfin, Polydactylus macrochir across northern Australia reveals multifaceted stock structure. Journal of Experimental Marine Biology and Ecology, 396 1: 53-60. doi:10.1016/j.jembe.2010.09.011


Author Newman, Stephen J.
Allsop, Quentin
Ballagh, Aaron C.
Garrett, Rod N.
Gribble, Neil
Meeuwig, Jessica J.
Mitsopoulos, Gabby E.A.
Moore, Bradley R.
Pember, Matthew B.
Rome, Ben M.
Saunders, Thor
Skepper, Craig L.
Stapley, Jason M.
van Herwerden, Lynne
Welch, David J.
Title Variation in stable isotope (δ18O and δ13C) signatures in the sagittal otolith carbonate of king threadfin, Polydactylus macrochir across northern Australia reveals multifaceted stock structure
Formatted title
Variation in stable isotope (δ18O and δ13C) signatures in the sagittal otolith carbonate
of king threadfin, Polydactylus macrochir across northern Australia reveals
multifaceted stock structure
Journal name Journal of Experimental Marine Biology and Ecology   Check publisher's open access policy
ISSN 0022-0981
Publication date 2010-12-15
Sub-type Article (original research)
DOI 10.1016/j.jembe.2010.09.011
Open Access Status Not yet assessed
Volume 396
Issue 1
Start page 53
End page 60
Total pages 8
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Language eng
Subject 1105 Ecology, Evolution, Behavior and Systematics
1104 Aquatic Science
Abstract Otoliths of king threadfin, Polydactylus macrochir were collected from 2007 to 2009 at nine locations across northern Australia representing most of their distributional range and areas where fisheries are active. Measurement of the stable isotope ratios of δO and δC in the sagittal otolith carbonate from assemblages of P. macrochir revealed location-specific signatures and indicated that adult fish sampled from representative sites across their range were significantly different. The significant differences in the isotopic signatures of P. macrochir demonstrated that population subdivision is evident and there is unlikely to be substantial movement of fish among these distinct adult assemblages. The stable isotopic signatures for the fish from the different locations were persistent through time, and therefore it could be concluded that they comprise separate stocks for many of the purposes of fisheries management. The spatial separation of these populations indicates a complex stock structure across northern Australia with stocks of P. macrochir associated with large coastal beaches and embayments on a fine spatial scale. These results indicate that in order to achieve optimal fisheries management, the current spatial management arrangements need to be reviewed, particularly the potential for localised depletion of stocks on small spatial scales. This study has provided further evidence that measurement of the stable isotopes ratios in teleost sagittal otolith carbonate can be a valuable tool in the delineation of fishable stocks or fishery management units of adult fish and that widely distributed fish can nonetheless show strong localised population structure.
Formatted abstract
Otoliths of king threadfin, Polydactylus macrochir were collected from 2007 to 2009 at nine locations across
northern Australia representing most of their distributional range and areas where fisheries are active.
Measurement of the stable isotope ratios of δ18O and δ13C in the sagittal otolith carbonate from assemblages of
P. macrochir revealed location-specific signatures and indicated that adult fish sampled from representative
sites across their range were significantly different. The significant differences in the isotopic signatures of
P. macrochir demonstrated that population subdivision is evident and there is unlikely to be substantial
movement of fish among these distinct adult assemblages. The stable isotopic signatures for the fish from the
different locations were persistent through time, and therefore it could be concluded that they comprise
separate stocks for many of the purposes of fisheries management. The spatial separation of these populations
indicates a complex stock structure across northern Australia with stocks of P. macrochir associated with large
coastal beaches and embayments on a fine spatial scale. These results indicate that in order to achieve optimal
fisheries management, the current spatial management arrangements need to be reviewed, particularly the
potential for localised depletion of stocks on small spatial scales. This study has provided further evidence that
measurement of the stable isotopes ratios in teleost sagittal otolith carbonate can be a valuable tool in the
delineation of fishable stocks or fishery management units of adult fish and that widely distributed fish can
nonetheless show strong localised population structure.
Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved.
Keyword King threadfin
Polydactylus macrochir
Polynemidae
Otolith isotope chemistry
Stock structure
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Chemistry and Molecular Biosciences
 
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