Copepod community response to variable upwelling conditions off central-southern Chile during 2002-2004 and 2010-2012

Publicado en Marine Ecology Progress Series

Pino-Pinuer, P., Escribano, R., Hidalgo, P., Riquelme-Bugueño, R. and Schneider, W.

Año de publicación 2014
DOI 10.3354/meps11001

Instituto Milenio de Oceanografía (IMO), Department of Oceanography, Faculty of Natural and Oceanographic Sciences, University of Concepción, PO Box 160 C, Campus Universitario, Concepción, Chile



Proyecto CRN3070


Community structure of pelagic copepods inhabiting the coastal upwelling zone of
central-southern Chile was compared between the periods 2002&minus2004 and 2010&minus2012. For both periods, 74 copepod species were identified the Order Calanoida accounted for 68% of the total abundance. Numerically dominant species (ca. 80% of total abundance) were Paracalanus cf. indicus, Oithona similis, Calanoides patagoniensis, Drepanopus forcipatus and Acartia tonsa. Multivariate analyses showed that from the first period (2002&minus2004) to the second period (2010&minus2012), there were significant changes in the abundance of some species, the order of dominance and community size structure, although no significant changes in species richness and diversity indexes were found. The dominant species, Paracalanus cf. indicus, was numerically replaced by Drepanopus forcipatus in 2010&minus2012. There was also a significant decrease in total
abundance of copepods during 2010&ndash2012. The assessment of oceanographic variables revealed that colder and saltier conditions prevailed during 2010&minus2012, accompanied by a greater stratification of the water column because of increased upwelling intensity. Our findings suggest that increasing upwelling has been an important factor for causing changes in the copepod community structure during the past decade.