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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 18, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(7):1184-1190; doi:10.1093/icesjms/fsn098
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Cross-front variations in adult abundance and recruitment of Patagonian scallop (Zygochlamys patagonica) at the SW Atlantic Shelf Break Front

A. Cecilia Mauna1, Bárbara C. Franco2, Ana Baldoni1, E. Marcelo Acha1,3, Mario L. Lasta1 and Oscar O. Iribarne3

1 Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo V. Ocampo No. 1, Mar del Plata B7602HSA, Argentina
2 Departamento Oceanografía, Servicio de Hidrografía Naval, Av. Montes de Oca 2124, Buenos Aires D1270ABV, Argentina
3 Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3250, Mar del Plata B7602HSA, Argentina, and Consejo Nacional de Investigaciones Científicas y, Técnicas, Argentina

Correspondence to A. C. Mauna: tel: +54 223 4862586; fax: +54 223 4861850; e-mail: cmauna-fuentes{at}inidep.edu.ar.

Mauna, A. C., Franco, B. C., Baldoni, A., Acha, E. M., Lasta, M. L., and Iribarne, O. O. 2008. Cross-front variations in adult abundance and recruitment of Patagonian scallop (Zygochlamys patagonica) at the SW Atlantic Shelf Break Front. – ICES Journal of Marine Science, 65: 1184–1190.

We studied cross-front variations in adult abundance and recruitment of Patagonian scallop (Zygochlamys patagonica) and their relationship with the Shelf Break Front and satellite-derived chlorophyll a in the Southwest Atlantic between 38°S and 39°30'S. Integrated data from commercial fleets (CF, 1996–2005), research cruises (RC, 1998–2005), sea surface temperature (SST; 1985–1997), and satellite-derived chlorophyll a (CSAT; 1998–2004) were included in the analysis. One-way ANOVA was used to assess differences in recruitment and scallop abundance in a cross-front direction. The abundance of scallops was greatest (RC > 200 kg h–1) closer to the onshore side of the front or beneath it, and the East–West extension of scallop beds (~40 km) matched the seasonal zonal displacement of the front (~37 km). The highest CSAT gradients were west of or matched the position of the front. The annual mean position of the front correlated with the spatial variability in recruitment within areas where the species recruited successfully (RC > 2000 h–1). The spatial variability in adult abundance and recruitment of scallops is strongly related to the spatial variability in the position of the front and with the high CSAT concentrations associated with it.

Keywords: abundance, marine fronts, recruitment, scallops, Southwest Atlantic, spatial pattern, Zygochlamys patagonica

Received 20 September 2007; accepted 20 May 2008; advance access publication 18 June 2008.


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