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espanolResumen: El 27 de febrero de 2010, la zona centro-sur de Chile (ca., 34-39oS) fue afectada por un terremoto de magnitud Mw= 8,8, localizandose el epicentro en Cobquecura (ca., 36oS), causando un levantamiento continental en las costas mas cercanas a la fosa (i.e., Peninsula de Arauco e Isla Santa Maria) y subsidencia en areas costeras localizadas al norte de esas costas (Region del Maule). En este estudio se evaluo la hipotesis de que independientemente del grupo taxonomico, los organismos bentonicos intermareales adheridos al sustrato pueden ser utilizados como indicadores de levantamiento cosismico continental. La metodologia consistio en medir la altura del limite superior de las bandas de distribucion de cada especie sobre el nivel de marea baja, a lo largo de la costa afectada por el terremoto. El alga calcarea Lithothamnium sp., el mitilido Perumytilus purpuratus y las macroalgas Mazzaella laminarioides y Lessonia spicata, son organismos bentonicos apropiados para describir el levantamiento continental cosismico. Se sugiere que en estudios tendientes a evaluar este tipo de procesos tectonicos, se utilice mas de una especie para tener una vision completa de tal proceso a lo largo de gradientes de deformacion continental. Esto ya que, parte importante de las especies bentonicas de la costa rocosa no tienen distribucion continua, por lo que el uso de una sola especie puede resultar en conclusiones con bajo nivel de generalizacion. EnglishAbstract: On February 27, 2010, the south central coast of Chile (ca., 34-39oS) was affected by an earthquake magnitude Mw= 8,8, with the epicenter located offshore Cobquecura (ca., 36.29oS). This earthquake originated continental uplift on that coastal areas closer to the trench between the Nazca and South American tectonic plates (i.e., Peninsula de Arauco and Isla Santa Maria) and subsidence along coastal areas located further north of that (the coast of the Maule Region), as well as in continental zones ordered in a west - east axis. In this study we tested the hypothesis that independent of the taxonomic group, the rocky shore sessile benthic organisms can be used as indicators of continental uplift. The methodology involved measurements of heights upper of distributional bands above the low tide level at the coast affected by the earthquake. The results show that the calcareous crustose algae Lithothamnium sp., the mytilid bivalve Perumytilus purpuratus and the macroalgae Mazzaella laminarioides and Lessonia spicata, are benthonic useful organisms to describe continental uplift, due to the fact that their vertical distributions after the earthquake follow the coastal deformation observed in the field. This allow to suggest that in studies aimed to evaluate this tectonic processes, more than a single species must be used in order to gain a full view of that along gradients of continental deformation. This due to the fact that a significant number of the benthic species of the rocky shore do not have continuous distribution; thus, to use a single species may well result in conclusions with low level of generalizations.

Uso de organismos intermareales del litoral rocoso como bio-indicadores de deformación continental cosísmica en el centro sur de Chile