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espanolA pesar de sus importantes funciones ecologicas, el conocimiento de los estados planctonicos de moluscos en fiordos australes de Chile es limitado. De aqui que los objetivos de esta investigacion fueron determinar la composicion de los principales grupos de moluscos planctonicos, su distribucion geografica y abundancia, entre el fiordo Reloncavi y el golfo Corcovado. Las muestras de plancton se recolectaron en 16 estaciones oceanograficas, durante el Crucero CIMAR 19-Fiordos, en julio 2013. Se efectuaron lances oblicuos en 2 estratos, de acuerdo con la profundidad de la picnoclina con una red WP2 (180 µm abertura de malla). Los organismos fueron separados manualmente de cada muestra, contados y asignados al menor nivel taxonomico posible. Se obtuvieron moluscos en todas las estaciones: Bivalvia (39,68%), Gastropoda (60,31%) y Cephalopoda (0,01%). La abundancia total vario entre 18,46 y 124,42 ind. m-3. Destaco la abundancia de larvas de bivalvos Pholadidae, Teredinidae y Xylophagidae. De gasteropodos destaco la abundancia de Thecosomata y Nudibranchia. De cefalopodos, solo se capturaron paralarvas de Octopoda. La alta abundancia relativa de larvas de bivalvos perforadores de madera seria un indicador de la presencia de materia organica de origen forestal en el fondo de los fiordos y tendrian un rol importante en el flujo de materia organica aloctona que llega a los fiordos. La temperatura y salinidad del agua serian las variables que mayormente modularian la distribucion de bivalvos y gasteropodos planctonicos en los fiordos chilenos. EnglishDespite their important ecological functions, knowledge of planktonic mollusks in southern fjords of Chile is limited. Hence, the goals of this research were to determine the composition of the main groups of planktonic mollusks, their geographical distribution and abundance, between the Reloncavi Fjord and the Corcovado Gulf. Plankton samples were collected at 16 oceanographic stations during the CIMAR-19 Fiordos cruise, in July 2013. Oblique hauls were made in two water depth layers according to the pycnocline depth with a WP2 net (180 µm mesh size). The organisms were removed manually from each sample, counted and assigned to the lowest possible taxonomic level. Mollusks were obtained in all stations: Bivalvia (39.68%), Gastropoda (60.31%) and Cephalopoda (0.01%). The total abundance of mollusks varied between 18.46 and 124.42 ind. m-3. Among bivalves highlighted the abundance of Pholadidae, Teredinidae and Xylophagidae larvae. Among gastropods highlighted the abundance of Thecosomata and Nudibranchia. Among cephalopods, only Octopoda paralarvae were captured. The abundance of bivalve boring species and their larvae have an important role in the flow of allochthonous organic matter across the fjords. The water temperature and salinity may be the variables that mostly modulate the distribution of planktonic bivalves and gastropods in the Chilean fjords.

Moluscos planctónicos entre el fiordo Reloncaví y el golfo Corcovado, sur de Chile: ocurrencia, distribución y abundancia en invierno