Mesozooplankton assemblages in two bays in the Beagle Channel (Argentina) during January, 2001

This paper describes the composition and abundance of mesozooplankton of Bahía Ushuaia and Bahía Golondrina. These small bays are located in the northern Beagle Channel. Sampling was carried out from January 20 to 23, 2001 and samples were collected from the upper layer at nine stations. This study...

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Bibliographic Details
Published in:Scientia Marina
Main Authors: Melisa Daiana Fernández-Severini, Monica Susana Hoffmeyer
Format: Article in Journal/Newspaper
Language:English
Published: Consejo Superior de Investigaciones Científicas 2005
Subjects:
mesozooplankton
copepods
beagle channel
assemblage
oithona
oncaea
ctenocalanus
antarctic
Aquaculture. Fisheries. Angling
SH1-691
Antarctic
Argentina
Golondrina
Ushuaia
Antarc*
Mesozooplankton
Copepods
Online Access:https://doi.org/10.3989/scimar.2005.69s227
https://doaj.org/article/495ac738073e4b368457a7b93a300a78
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Summary:This paper describes the composition and abundance of mesozooplankton of Bahía Ushuaia and Bahía Golondrina. These small bays are located in the northern Beagle Channel. Sampling was carried out from January 20 to 23, 2001 and samples were collected from the upper layer at nine stations. This study is the first research on mesozooplankton in this part of the Beagle Channel. Due to their dominance in the mesozooplankton community, we compared our Copepoda data with those reported by other authors from Antarctic coastal environments. By applying cluster analysis, we found two station groups in both bays: one in slightly polluted zones and the other in undisturbed external zones. Four assemblages in Bahía Ushuaia and two in Bahía Golondrina were determined by using non-metric multidimensional scaling (MDS) and cluster analysis. Mesozooplanktonic assemblages showed a certain resemblance in zones with and without anthropogenic influence. Most of the copepod species in our samples are typical of the sub-Antarctic region. Oithona similis (=O. helgolandica sensu Ramírez, 1966), Oncaea curvata, and Ctenocalanus citer show either similar or higher abundances at Antarctic coastal sites, including the upper layer in oceanic areas, in comparison with sub-Antarctic coastal localities. This suggests that, in agreement with other findings, the Polar Front is probably not a major geographic boundary for the distribution of these species.

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