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Marine Ecology Progress Series

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MEPS 448:105-118 (2012)  -  DOI:

Geographic variation in trace-element signatures in the statoliths of near-hatch larvae and recruits of Concholepas concholepas (loco)

Patricio H. Manríquez1,2,*, Sylvana P. Galaz2, Tania Opitz2, Scott Hamilton3, George Paradis4, Robert R. Warner5, Juan Carlos Castilla6, Fabio A. Labra7,8, Nelson A. Lagos7

1Instituto de Ciencias Marinas y Limnológicas, and 2Laboratorio Costero de Recursos Acuáticos de Calfuco, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
3Moss Landing Marine Laboratories, 8272 Moss Landing Road, Moss Landing, California 95039, USA
4Department of Geological Sciences and Marine Science Institute, and 5Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, California 93106, USA
6Departamento de Ecología and Center for Advanced Studies in Ecology & Biodiversity, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Casilla 114-D, Santiago, Chile
7Centro de Investigación en Ciencias Ambientales, Facultad de Ciencias, Universidad Santo Tomás, Ejercito 146, Chile
8Instituto de Ecología y Biodiversidad, Casilla 653, Santiago, Chile

ABSTRACT: Spatial variation of trace elements in calcified structures (otoliths, statoliths, and shells) has been used to track the movements of individuals among habitats, and connectivity between marine populations. In the present study, we used laser ablation−inductively coupled plasma mass spectrometry to quantify the concentrations of trace elements in statoliths of pre-hatch larvae and recruits of the gastropod Concholepas concholepas from 3 regions in Chile. We also examined spatial variation in chemical signatures deposited during larval life and at the time of settlement in intertidal habitats. We found significant differences between 3 geographic regions in the trace element concentrations recorded in natal statoliths of near-hatch larvae and in natal core and edge areas of recruit statoliths. Discriminant function analysis indicates that natal signatures of near-hatch larvae and the cores and edges of recruit statoliths show spatial segregation among regions. High levels of reclassification success of larvae to the origin region suggest potential for assigning recruits to the corresponding matching region. Concentrations of trace elements in the natal cores of recruit statoliths fell relatively close but did not overlap with the discriminant space occupied by larvae, and at regional scales the pattern of geographic variation of recruit statoliths resembles that of larval statoliths. This suggests population grouping and little population interchange at this regional scale. Assessing population stocks and connectivity of this species at smaller scales along the Chilean coast will only be possible with more finely structured sampling and a better understanding of temporal variation in the chemical environment.

KEY WORDS: Chilean coast · Statolith microchemistry · Trace element · Larvae · Recruits · LA-ICPMS · Concholepas

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Cite this article as: Manríquez PH, Galaz SP, Opitz T, Hamilton S and others (2012) Geographic variation in trace-element signatures in the statoliths of near-hatch larvae and recruits of Concholepas concholepas (loco). Mar Ecol Prog Ser 448:105-118.

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