Seasonal variability of metazooplankton in coastal sub-Antarctic waters (Beagle Channel)

Abstract

The aim of this study was to analyse the variability in the species composition and abundance of the metazooplankton community in different coastal areas of the Beagle Channel (southern tip of South America) during a seasonal cycle. Sampling was conducted during November (spring) 2005, March (summer), June (autumn) and September (winter) 2006 at 12 coastal stations. Copepods were the most abundant group throughout the study, and their assemblages were composed of a mixture of species typical of the south-western Atlantic, the south-eastern Pacific and the Southern Ocean. Among them, Oithona similis, Ctenocalanus citer and Drepanopus forcipatus were the dominant species. The copepod Acartia tonsa was the only taxon that displayed a spatial pattern of abundance, showing higher densities in areas with lower salinities. The community structure showed a strong temporal pattern. The metazooplankton community in March and June was mainly composed of copepods, while in November and September the community showed a greater diversity. In these two months high densities of meroplanktonic larvae were found, in coincidence with higher chlorophyll-a concentration. This temporal pattern seems to be more dependent on primary production than on physical factors such as temperature or salinity. The absence of a clear spatial pattern may suggest that the studied area of the Beagle Channel behaves as a semi-enclosed water body.

Keywords:

• Zooplankton
• community structure
• Beagle Channel
• sub-Antarctic

Published in collaboration with the University of Bergen and the Institute of Marine Research, Norway, and the Marine Biological Laboratory, University of Copenhagen, Denmark

Published in collaboration with the University of Bergen and the Institute of Marine Research, Norway, and the Marine Biological Laboratory, University of Copenhagen, Denmark

Acknowledgements

We thank all the members of the Laboratorio de Crustáceos Marinos (Centro Austral de Investigaciones Científicas, Ushuaia) and Marcelo Hernando for their support during field work. We also thank David McKinnon and the three anonymous reviewers for their valuable comments. Gastón E. Aguirre was funded by a doctoral fellowship (Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina). This work was supported by UBACYT X025/X073 and CONICET PIP 5507/11220080100420 grants to G.B. Esnal, and UBACYT 20020100200048 grant to F.L. Capitanio.

Notes

Published in collaboration with the University of Bergen and the Institute of Marine Research, Norway, and the Marine Biological Laboratory, University of Copenhagen, Denmark