Paper| Year: | 2014 |
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| Author(s): | B. Morales-Nin, S. Pérez-Mayol, M. Palmer, A.J. Geffen |
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| Title: | Coping with connectivity between populations of Merluccius merluccius: An elusive topic |
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| Journal: | JOURNAL OF MARINE SYSTEMS |
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| ISSN: | 0924-7963 |
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| JCR Impact Factor: | 2.508 |
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| Volume: | 138 |
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| Pages: | 211-219 |
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| D.O.I.: | 10.1016/j.jmarsys.2014.04.009 |
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| Web: | |
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| Abstract: | The elemental composition of European hake otoliths was analyzed at the
core, settlement mark and otolith edge zones corresponding to the
periods of pelagic early life stage, settlement to the bottom, and
juvenile life, respectively. Barium, Sr, Mg, Mn and Ca were measured
using LA-ICPMS on the sagitta otoliths of hake sampled in 6 different
Western Mediterranean areas, separated by tens to hundreds of
kilometers. The otolith edge, which should have incorporated the water
mass signal of the sampling area, showed a high degree of overlap
between geographical areas. This precluded the discrimination of
geographically distinct groups. However, there was a clear ontogenetic
signal in all the fish, with higher Sr:Ca in the otolith core. Ba:Ca was
higher at the settlement mark, while Mn:Ca was overlapped with the core
values. The otolith edge had lower ratios for all elements except for
Mg. The conflicting effects of the ontogenic patterns and the
inconclusive allocation of a geographical signal at the edge, precluded
to assign individual hake to a natal origin based on the composition of
the core and settlement mark zones. Our results may be explained by high
mobility of the juvenile hake in this area of the Mediterranean, or by
the relative homogeneity in the water masses for the four elements
considered in this study. While this subset is useful for distinguishing
major water masses or regional differences between, for example, the
Atlantic and the Mediterranean, a larger set of elements could be needed
for smaller-scale studies. |
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Related staffBeatriz Morales NinMiguel Palmer VidalSílvia Pérez MayolRelated projectsIDEADOSRelated research groupsGlobal Change ResearchMarine Ecosystems Dynamics
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