Repositorio Digital Marítimo, Fluvial y Costero

Moreno, Carlos A.. (2004). Effects of El Niño in the recruitment rates of Concholepas concholepas and Tegula atra (Mollusca, Gastropoda) in the coast of Valdivia, Chile. El Niño-La Niña 1997-2000. Sus Efectos en Chile.. pp. 179-489.

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Abstract

This paper describes the findings made in relation to the effects of the El Niño Southern Oscillation (ENSO) over the settlement magnitudes of two gastropods, Concholepas concholepas and Tegula atra in the coasts of Valdivia, X Region, Chile. On regard to the former species, adverse effects to settlement are evident when the El Niño or La Niña reach strong values (Southern Oscillation Index (SOI) –1 or +1). This is possibly related to the disruption of upwelling conditions when the El Niño phenomenon strikes, inhibiting in this way the enrichment of food chains and impacting directly on the larvae that live at least 4 months in the plankton. In the case of La Niña episodes, reasons for low settlement still remain unknown. During “normal” conditions, the settlement rate of C. concholepas is remarkably high during the months in which the mean SOI values are close to zero. In the Tegula atra case, a positive effect is attained during El Niño conditions, given that the larvae of this species recruit in high numbers when warm oceanic fronts collide with the coastal zone. Surprisingly, studies of this type have received little attention in the past in Chile, in spite of its close relation with the management of marine resources. Fortunately, this topic is beginning to receive its deserved consideration.

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Item Type:	Article
Uncontrolled Keywords:	Ecología larvaria, Mollusca. Concholepas. Tegula. Asentamiento. Reclutamiento. Intermareal rocoso
Geographical coverage :	Chile
Depositing User:	Alianza Regional del Sistema Mundial de Observación de los Océanos (GOOS) para el Pacífico Sudeste - GRASP
ISSN:	956-235-024-X
Official URL:	http://www.cona.cl/pub/detalle_cientifica.php?pub=...

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