Polar Biology

, Volume 33, Issue 3, pp 293–304 | Cite as

The role of the chaetognath Sagitta gazellae in the vertical carbon flux of the Southern Ocean

  • Ricardo Giesecke
  • Humberto E. González
  • Ulrich Bathmann
Original Paper

Abstract

Chaetognaths are among the most abundant predators in the Southern Ocean and are potentially important components in the biological carbon pump due to the production of large, fast-sinking fecal pellets. In situ S. gazellae abundance, fecal pellet production, sinking rates, carbon content, and vertical carbon fluxes were measured at the Lazarev Sea between December 2005 and January 2006. Sagitta gazellae produce fecal pellets that sink at speeds of 33–600 m day−1 and have carbon contents of 0.01–0.8 mg C pellet−1. Vertical carbon flux was later compared with the total carbon flux measured at 360 m depth at the study area. Rough estimates using published seasonal abundance of S. gazellae indicate that, at 360 m depth in the Lazarev Sea, this specie may contribute 12 and 5% of the total vertical carbon flux in winter (ice-covered) and summer (ice-free), respectively. Thus, the role of chaetognaths in the downward transport of organic matter may be far more important than previously thought.

Keywords

Vertical carbon flux Chaetognaths Sagitta gazellae Antarctica 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Ricardo Giesecke
    • 1
    • 2
  • Humberto E. González
    • 1
    • 3
    • 4
  • Ulrich Bathmann
    • 5
  1. 1.Center for Oceanographic Research in the Eastern South Pacific (COPAS), COPAS Sur-AustralUniversidad de ConcepciónConcepciónChile
  2. 2.Graduate Program in Oceanography, Department of OceanographyUniversidad de ConcepciónConcepciónChile
  3. 3.Institute of Marine Biology “Jürgen Winter”Universidad Austral de ChileValdiviaChile
  4. 4.CIEPPatagonia Ecosystems Research CenterCoyhaiqueChile
  5. 5.Alfred-Wegener-Institute for Polar and Marine ResearchBremerhavenGermany

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