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Polar Biology

, Volume 36, Issue 6, pp 895–906 | Cite as

Shifts in Antarctic megabenthic structure after ice-shelf disintegration in the Larsen area east of the Antarctic Peninsula

  • Julian Gutt
  • Mattias Cape
  • Werner Dimmler
  • Laura Fillinger
  • Enrique Isla
  • Verena Lieb
  • Tomas Lundälv
  • Christian Pulcher
Original Paper

Abstract

The aim of this study was to contribute to a general understanding of the response of the Antarctic macrobenthos to environmental variability and climate-induced changes. The change in population size of selected macrobenthic organisms was investigated in the Larsen A area east of the Antarctic Peninsula in 2007 and 2011 using ROV-based imaging methods. The results were complemented by data from the Larsen B collected in 2007 to allow a conceptual reconstruction of the environment-driven changes before the period of investigation. Both Larsen areas are characterised by ice-shelf disintegration in 1995 and 2002, respectively, as well as high inter-annual variability in sea-ice cover and oceanographic conditions. In 2007 one ascidian species, Molgula pedunculata, was abundant north and south of the stripe of remaining ice shelf between Larsen A and B. Population densities decreased drastically in the Larsen A between 2007 and 2011, coincident with the decrease in Corella eumyota, another ascidian. Among the ophiuroids, the population of deposit feeders increased, while suspension feeders halved their abundance. Current measurements indicated a northward flow between the Larsen B and Larsen A, suggesting that a major physical forcing on benthic population development comes from the South. The results demonstrate that Antarctic macrobenthic populations can exhibit dramatic population dynamics. Analyses of sea-ice dynamics, salinity, temperature and surprisingly ice-shelf disintegration history, however, did not provide any clear evidence for environmental drivers underlying the apparent changes.

Keywords

Ascidians Ophiuroids Population growth Population collapse Climate change Interannual sea-ice dynamics Current regime 

Notes

Acknowledgments

Thanks are due to those who made a repetitive study in such an area of very difficult accessibility possible, referees, science managers, the crew of “Polarstern” and to the experts that helped with the identification of taxa (s.l.), A. Boetius, M. Taitán, R. Sahade and C. Sands. M. Cape was funded by the US National Science Foundation (NSF) grant ANT-0732983, the US National Aeronautics and Space Administration (NASA) award 12-EARTH12F-0091 and a US NSF Graduate Research Fellowship.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Julian Gutt
    • 1
  • Mattias Cape
    • 2
  • Werner Dimmler
    • 3
  • Laura Fillinger
    • 1
  • Enrique Isla
    • 4
  • Verena Lieb
    • 1
    • 5
  • Tomas Lundälv
    • 6
  • Christian Pulcher
    • 1
    • 7
  1. 1.Alfred Wegener Institute Helmholtz Centre for Polar and Marine ResearchBremerhavenGermany
  2. 2.Scripps Institution of OceanographyUniversity of CaliforniaLa Jolla, San DiegoUSA
  3. 3.Fielax Gesellschaft für wissenschaftliche Datenverarbeitung mbHBremerhavenGermany
  4. 4.Institut de Ciències del Mar-CSICPasseig Marítim de la BarcelonetaBarcelonaSpain
  5. 5.Christian-Albrechts-Universität KielKielGermany
  6. 6.Sven Lovén Centre for Marine SciencesUniversity of GothenburgStrömstadSweden
  7. 7.Institut für Biologie und UmweltwissenschaftenCarl von Ossietzky Universität OldenburgOldenburgGermany

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