Scientia Marina, Vol 69, No S2 (2005)

Soft-bottom macrobenthic faunal associations in the southern Chilean glacial fjord complex


https://doi.org/10.3989/scimar.2005.69s2225

Carlos Ríos
Dirección de Programa Antártico, Universidad de Magallanes, Chile

Erika Mutschke
Instituto de la Patagonia, Universidad de Magallanes - Centro de Estudios del Cuaternario de Fuego-Patagonia y Antártica Chilena (CEQUA), Chile

Americo Montiel
Instituto de la Patagonia, Universidad de Magallanes - Centro de Estudios del Cuaternario de Fuego-Patagonia y Antártica Chilena (CEQUA), Chile

Dieter Gerdes
Alfred Wegener Institute for Polar and Marine Research, Germany

Wolf E. Arntz
Alfred Wegener Institute for Polar and Marine Research, Germany

Abstract


Macrobenthic associations were investigated at 29 sampling stations with a semi-quantitative Agassiz trawl, ranging from the South Patagonian Icefield to the Straits of Magellan in the South Chilean fjord system. A total of 1,895 individuals belonging to 131 species were collected. 19 species belong to colonial organisms, mainly Bryozoa (17 species) and Octocorallia (2 species). The phylum Echinodermata was the most diverse in species number (47 species), with asteroids (25 species) and ophiuroids (13 species) being the best represented within this taxon. Polychaeta was the second dominant group in terms of species richness (46 species). Multidimensional scaling ordination (MDS) separated two station groups, one related to fjords and channels off the South Patagonian Icefield and the second one to stations surrounding the Straits of Magellan. 45 species account for 90% of the dissimilarity between these two groups. These differences can mainly be explained by the influence of local environmental conditions determined by processes closely related to the presence/absence of glaciers. Abiotic parameters such as water depth, type of sediment and chemical features of the superficial sediment were not correlated with the numbers of individuals caught by the Agassiz trawl in each group of sampling stations.

Keywords


Magellan region; South Patagonian Icefield; Straits of Magellan; community structure; biodiversity

Full Text:


PDF


Copyright (c) 2005 Consejo Superior de Investigaciones Científicas (CSIC)

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.


Contact us scimar@icm.csic.es

Technical support soporte.tecnico.revistas@csic.es