Polychaetes from Aysen Fjord, Chile: distribution, abundance and biogeographical comparison with the shallow soft-bottom polychaete fauna from Antarctica and the Magellan Province

This paper analyzes the composition, abundance and biogeographical relationship of the benthic polychaetes collected in three shallow subtidal locations (mouth of Cuervo and Condor rivers and Acantilada Bay) from Aysen Fjord, AF, Chile (45ºS, 73ºW), and provides a comparison with data on shallow sof...

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Bibliographic Details
Published in:Marine Medicine
Main Authors: Cañete, J. I., Leighton, G. L., Aguilera, F. F.
Format: Article in Journal/Newspaper
Language:English
Published: Consejo Superior de Investigaciones Científicas 1999
Subjects:
Polychaeta
biodiversity
biogeography
Chile
Magellan Province
Antarctica
biodiversidad
biogeografía
Provincia de Magallanes
Antártida
Antarctic
The Antarctic
Antarctic Peninsula
Weddell
Magallanes
Estrecho
Cape Horn
Canales
Cóndor
Antarc*
Antártica
Online Access:https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/909
https://doi.org/10.3989/scimar.1999.63s1243
Description
Summary:This paper analyzes the composition, abundance and biogeographical relationship of the benthic polychaetes collected in three shallow subtidal locations (mouth of Cuervo and Condor rivers and Acantilada Bay) from Aysen Fjord, AF, Chile (45ºS, 73ºW), and provides a comparison with data on shallow soft-bottom polychaetes from Antarctica and other locations of the Magellan Province: Dalcahue Channel, DC (42º22´S, 73º39´W), Puerto Cisnes, Puyuhuapi Channel, PC (44º43´S, 72º42´W) and Magellan Straits, MS. AF polychaete fauna comprises 38 species, the macrobenthic taxon being most representative in terms of abundance and species richness. The importance of polychaetes seems to be higher in fjords than in channels. Low numbers of common species were detected among DC, PC, MS and AF, indicating differences along the influence area of the Cape Horn Current or along the Magellan Province. The polychaetes from AF show low affinities with Antarctica; maximum number of common species was observed with the Antarctic Peninsula, whereas the lowest values were recorded from locations in the Ross and Weddell Seas. Coincidence in some ecological attributes between AF and Antarctica indicate that polychaetes may play an important and similar ecological role in both environments. Se analiza la composición, abundancia y relaciones biogeográficas de poliquetos bentónicos recolectados en tres localidades someras (desembocadura de los ríos Cuervo y Cóndor y Bahía Acantilada) del Seno Aysén, SA, Chile (45ºS, 73ºO), y se efectúa una comparación con los poliquetos de la Antártida y otras localidades de la Provincia de Magallanes: Canal Dalcahue, CD (42º22’S, 73º39’O), Puerto Cisnes, Canal Puyuhuapi, CP (44º43’S, 72º42’O) y Estrecho de Magallanes, EM. La poliquetofauna del SA se compone de 38 especies, siendo el taxón más representativo del macrobentos en términos tanto de abundancia como de riqueza de especies. La importancia de los poliquetos parece mayor en fiordos que en canales. Se detectaron escasas afinidades entre CD, CP, EM y SA, indicando diferencias geográficas del papel de los poliquetos en la Provincia de Magallanes o en el área influenciada por la corriente del Cabo de Hornos. Existen escasas afinidades entre los poliquetos del SA y la Antártida; el mayor número de especies comunes fue compartido con la Península Antártica, mientras que ocurría lo contrario con localidades de los Mares de Ross y Weddell. La similitud de algunos atributos ecológicos entre SA y la Antártida sugieren que los poliquetos juegan un papel ecológico similar en ambos ambientes.

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