Abstract
Multilocus allozyme heterozygosity (MLH) has been positively correlated with growth in some marine bivalves and was suggested to facilitate swimming activity in pectinids. Using two highly mobile scallops, Placopecten magellanicus and Argopecten purpuratus, we examined escape response performance and morphometric characteristics as a function of allelic variability at metabolic loci. Ten allozyme systems were used for A. purpuratus and 7 for P. magellanicus. In each species, the morphometric characteristics and escape response parameters were analyzed separately using principal components analysis (PCA) and the scores of the major principal components were related to allozyme heterozygosity. In both P. magellanicus and A. purpuratus, positive correlations were found between MLH and morphometric parameters, but escape response parameters were only positively linked to MLH in P. magellanicus, and then weakly. The hypothesis that MLH improves fitness of pectinids by increasing the capacity to escape predators is not supported.
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Acknowledgments
This research was supported by funds from the RAQ and NSERC to HG and from FONDECYT 3020034 to KB. HPC was a recipient of a scholarship from the Organization of American States. The authors are extremely grateful to the staff of the “Laboratorio central de cultivos marinos” from Universidad Católica del Norte, Chile and the staff of the MAPAQ, Îles de la Madelaine, Canada, in particular to Carlos Solar, Madelaine Nadau and Bruno Myrand for facilitating our work. The technical assistance of Raul Vera, Xavier Janssoone, Andrée-Anne Labrecque, Stéphanie Labbé-Giguère, Kathy Jeno, Nicolas Leiva, Miguel Rivera and Javier Rojas was highly appreciated. The experiments comply with the current laws of the countries in which the experiments were performed.
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Pérez, H.M., Brokordt, K.B., Tremblay, R. et al. Allozyme heterozygosity and escape response performance of the scallops, Argopecten purpuratus and Placopecten magellanicus . Mar Biol 158, 1903–1913 (2011). https://doi.org/10.1007/s00227-011-1702-y
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DOI: https://doi.org/10.1007/s00227-011-1702-y