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Findings from experiments showed that the web-feeding euthecosomatous pteropod,  Limacina retroversa , can produce rapidly sinking, mucous aggregates. It is suggested that, by adhesion, these aggregates scavenged picoplankton-sized particles, which were thus effectively cleared from the medium. In contrast,  Calanus finmarchicus  was not able to clear these particles in our experiments. Sedimentation velocities of 10 aggregates measured  in vivo  were up to 1000 m day −1 , with an average of ˜300 m day −1  (not including two aggegates with neutral buoyancy). Mean velocities measured for feces of  C.finmarchicus ,  Calanus  hyperboreus and  Thyssnoessa  sp. were consider ably lower. We suggest that the sedimentation of  L retroversa  aggregates was the source of mucous flocs collected in sediment traps (Bathmann  et al., Deep-Sea  Res., 38,1341–1360,1991) and at the sea floor at 1200 m depth in the southern Norwegian Sea. This process may be an important mediator of sedimentation to the deep sea, when these pteropods are present in surface waters in large abundance.

Clearance of picoplankton-sized partides and formation of rapidly sinking aggregates by the pteropod, Limacina reiroversa