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Mesozooplankton succession in a sub-Antarctic bay (Beagle channel, Southern tip of South America): distinctive annual patterns between two environmentally different zones

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Abstract

Frequent sampling of zooplankton is essential to understand their annual dynamics. However, in polar and subpolar ecosystems, such sampling is rare. This study comparatively analysed, for the first time, the annual mesozooplankton succession in the northwest nearshore and external zones of Ushuaia Bay in the sub-Antarctic Beagle Channel by monthly sampling over two years. The nearshore zone, with shallow waters and strong continental and anthropogenic influence, was characterised by the year-round occurrence of the euryhaline copepod Eurytemora americana and adventitious taxa. The mesozooplankton community exhibited pronounced monthly and year-to-year variability but, as a general seasonal trend, winter assemblages were dominated by the copepod Oithona similis and adventitious nematodes, whereas the spring–summer ones were dominated by E. americana, the cladoceran Podon leuckarti and Cirripedia nauplii. In the external zone, the copepods Drepanopus forcipatus and Ctenocalanus citer were found throughout the year. The annual succession showed a clearer seasonal pattern. Main shifts in community structure occurred in late winter–spring and late summer–autumn, when a high representation of meroplankton and appendicularians was closely associated with phytoplankton blooms. The higher temporal variability in the nearshore community was partially related to variable contributions of adventitious taxa to assemblage composition and may be also reflecting stressful conditions for plankton species linked to freshwater and urban discharges reported within the bay. This study allowed filling the temporal gaps in previous research and providing a more complete picture of the annual mesozooplankton dynamics in the Beagle Channel, generating hypotheses at the community and population levels for future research.

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Acknowledgements

We are very grateful to Ignacio Chiesa, Cristina Daponte, Daniel Nahabedian and Sofia Dutto for helping us with the taxonomic determinations. We are indebted to the Centro Austral de Investigaciones Científicas (CADIC), Ushuaia, Argentina, and especially to the people who participated in project GEF-PNUD Arg. 2/18 “Coastal pollution prevention and management of marine biodiversity”. We would also like to thank the reviewer Dr. Danilo L. Calliari and the two anonymous reviewers for their constructive criticism and valuable suggestions that notably improved an earlier version of this manuscript. This study was partially supported by PIP CONICET 2012–2014 grant to F. Capitanio. M. L. Presta was funded by a doctoral fellowship of the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.

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Correspondence to María Laura Presta.

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Presta, M.L., Hoffmeyer, M.S. & Capitanio, F.L. Mesozooplankton succession in a sub-Antarctic bay (Beagle channel, Southern tip of South America): distinctive annual patterns between two environmentally different zones. Polar Biol 43, 1175–1191 (2020). https://doi.org/10.1007/s00300-020-02698-z

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  • DOI: https://doi.org/10.1007/s00300-020-02698-z

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