In situ experiment of ontogenetic variability in the otolith chemistry of Stegastes partitus

Chittaro, P.M. and Hogan, J.D. and Gagnon, J. and Fryer, B.J. and Sale, P.F. (2006) In situ experiment of ontogenetic variability in the otolith chemistry of Stegastes partitus. Springer-Verlag. pp. 1-9.

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    Otolith chemistry can be used to assess pelagic larval fish connectivity by comparing spatially variable otolith edge chemistry (corresponding to the site of collection) to otolith core chemistry (corresponding to site of hatching). However, because the otolith's edge and core represent different life stages, the deposition of elements may differ, thus complicating direct comparisons of edge and core chemistry to investigate connectivity. Here we present data from a field experiment in which otoliths from embryos (3 days post-fertilization) and juveniles of Stegastes partitus were collected at the same site and time, and chemically analyzed to assess whether elemental concentrations of otoliths vary ontogenetically. Separate multivariate analyses, each investigating the spatial/temporal variability in the chemistry of either embryo otoliths or the edge of juvenile otoliths, revealed significant differences, suggesting an environmental influence to the chemical signal of otoliths. A nested multivariate analysis assessing whether otolith chemistry varied with life history stage (i.e., ontogenetic variability) indicated that elemental concentrations of embryo otoliths were significantly greater than that of juvenile otolith edges. Specifically, embry elemental concentrations of Mn, Zn, Sn, Ba, Ce, and Pb were between 2 and 163 times greater than those of the corresponding juvenile otoliths and thus the environment was not the primary determinant of embryo otolith chemistry. Consequently, caution is warranted when interpreting environmental patterns of otolith cores, particularly when using them as a proxy of natal signatures.

    Item Type: Peer-reviewed Journal Article
    Related URLs:
      Publisher: Springer-Verlag
      Subjects: (A) Biodiversity > (AC) Fish > (ACB) Marine
      (C) Ecosystems > (CB) Marine > (CBA) Coral Reefs
      (H) Protected Areas > (HD) Marine Reserve
      Publication Sources: (3) Other Source > (3B) NGOs
      Date Deposited: 25 Jul 2014 08:18
      Last Modified: 25 Jul 2014 08:18

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