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The understanding of the role of the pteropods  Limacina helicina  in the ecosystem has become of greater interest as the debate on ocean acidification and its consequences for calcifying organisms has increased. Four incubation experiments were carried out in January and February 2006 in Terra Nova Bay Polynya (Ross Sea) to identify the faecal pellets (FPs) produced by  L. helicina . Mean FP production rates were 6.1 ± 1.3 and 10.9 ± 2.1 pellets day −1  individual −1  in January and February, respectively. FPs produced by  L. helicina  had an oval shape with a more lengthened side. The identification of  L. helicina  faeces allowed us to quantify the amounts of  L. helicina  FPs in the material collected by sediment traps deployed in the same area from 1998 to 2001. We found that  L. helicina  FPs flux ranged from 71 × 10 3  FP m −2  year −1  to 362 × 10 3  FP m −2  year −1  and reach maximum values in March–April every year. The FPs flux of this organism contributed 19% of the particle organic carbon flux. The carbon pump may be modified if the  L. helicina  population declines as a consequence of the predicted acidification in polar and subpolar waters.

Importance of the contribution of Limacina helicina faecal pellets to the carbon pump in Terra Nova Bay (Antarctica)