Elemental composition of otolith growth marks in three geographically separated populations of European hake (Merluccius merluccius) |
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Authors: | Javier Tomás Audrey J Geffen Richard S Millner Carmen G Piñeiro George Tserpes |
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Institution: | 1. School of Biological Sciences, Port Erin Marine Laboratory, University of Liverpool, Isle of Man, IM9 6JA, Port Erin, UK 5. Department of Biology, University of Bergen, P.O. Box 7800, 5020, Bergen, Norway 2. Fisheries Laboratory CEFAS, Pakefield Road, Lowestoft, NR33 OHT, Suffolk, UK 3. Centro Oceanográfico de Vigo, Instituto Espa?ol de Oceanografía, Cabo Estay-Canido, Apdo. 1552, 36280, Vigo, Spain 4. Hellenic Centre for Marine Research, P.O. Box 2214, 71003, Iraklion, Crete, Greece
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Abstract: | The composition of the opaque and translucent bands in the otoliths of European hake (Merluccius merluccius) from three different populations (Celtic Sea, Galicia shelf and Cretan Sea) was analysed with wavelength dispersive spectrometry
(WDS) and differences in Ca, Sr and Na were compared. The translucent bands (annual marks and checks altogether) were significantly
richer in Sr and Ca and significantly poorer in Na than opaque bands. Results support the idea of a more compact arrangement
of crystals in translucent bands compared to opaque. Analyses did not help to discriminate between putative annual marks and
checks. Clear differences in the range of Sr/Ca variation across the otolith as well as in the composition of the otolith
core were observed among the three populations. As a result it was possible to discriminate the natal origin of each fish
using the composition of the otolith core in Ca, Sr and Na. Nevertheless, the overall pattern across the otolith was similar
among the three populations suggesting the existence of ontogenetic trends. Variation of Na/Ca ratios was largely uninformative.
Based on these results, a conceptual model for hake is proposed which integrates the different sources of otolith Sr/Ca variation:
ambient Sr/Ca, endogenous cues (ontogeny) and exogenous cues (environment). |
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