Situación actual de la macrofauna presente en el intermareal de bloques y cantos de bahía Laredo, estrecho de Magallanes
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1998
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Se entrega un listado preliminar de la macrofauna presente en un ambiente de bloques y cantos de bahía Laredo (52°30'S-70°51'W), estrecho de Magallanes basado en muestras recolectadas durante varios años. Esta área es representativa de un tipo característico de ambiente formado por acción glacial. Se encuentra ubicada en una zona de aparente influencia por
parte de componentes de aguas del Pacífico, Atlántico y Antartica. Ha sido objeto de numerosas expediciones científicas, en su mayoría europeas, no obstante la bibliografía dispersa en muchos países y las dificultades de acceso a colecciones taxonómicas de referencia dificultan los estudios que se realizan actualmente en el área. Se describe un total de 46 especies de la macrofauna, los cuales ocupan distintos microhábitats ofrecidos por la superposición de sedimentos grandes.
En general, Mollusca es el taxon dominante con 26 especies. Le sigue el Phylum Echinodermata con ocho especies identificadas. Grupos tales como Anthozoa, Nemertini, Nematoda, Copepoda y Amphipoda, incluidos como constituyentes importantes de la biota local, no fueron considerados en el análisis debido a las extremas dificultades para su apropiada determinación.
Based on several investigation within the last years, a preliminary list of the benthic macrofauna in a boulder-cobble's field of Laredo bay (52"30'S-70"51'W), Strait of Magellan, is presented in this work. This area under investigation is a typical environment created by the rubdown of glaciers during the last ice-age. Thus, several expedition, mainly Europeans, obtained large data sets at the beginning of this century in this region, it is especially hard to get those rare reports, which complicates the taxonomic work in this area. In total 46 species of macrozoobenthos are described, occupying various microhabitats, which is due to a sand-floor environment covered with overlapping boulders. Mollusca dominate the benthic regime with a total of 26 identified species, Echinodermata contribute 8 species. Some taxonomic groups, such as Copepoda, Nematoda, Nemertini, Anthozoa and Amphipoda are difficult to identify and therefore, though they dominate some local areas, were not considered in this analysis.
Based on several investigation within the last years, a preliminary list of the benthic macrofauna in a boulder-cobble's field of Laredo bay (52"30'S-70"51'W), Strait of Magellan, is presented in this work. This area under investigation is a typical environment created by the rubdown of glaciers during the last ice-age. Thus, several expedition, mainly Europeans, obtained large data sets at the beginning of this century in this region, it is especially hard to get those rare reports, which complicates the taxonomic work in this area. In total 46 species of macrozoobenthos are described, occupying various microhabitats, which is due to a sand-floor environment covered with overlapping boulders. Mollusca dominate the benthic regime with a total of 26 identified species, Echinodermata contribute 8 species. Some taxonomic groups, such as Copepoda, Nematoda, Nemertini, Anthozoa and Amphipoda are difficult to identify and therefore, though they dominate some local areas, were not considered in this analysis.
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Macrofauna, Bahía Laredo, Moluscos
Citación
Anales del Instituto de la Patagonia, Vol. 26, pp. 5-29, 1998