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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 7 | PAGES 863-875 | 1997
© Oxford University Press

research-article

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

Thomas T. Noji, Ulrich V. Bathmann1, Bodo von Bodungen2, Maren Voss2, Avan Antia3, Manta Krumbholz3, Bert Klein4, Ilka Peeken3, Carola I.-M. Noji5 and Francisco Rey

Institute of Marine Research PO Box 1870, N-5024 1Alfred Wegener-Institut für Polar- und Meeresforschung Am Handelshafen 12, D-27515 Bremerhaven 2Institute for Baltic Sea Research Seestraße 15, D-25300 Warnemünde 3Sonderforschungs 313 University of Kiel, Heinrich-Hecht Platz 10, D-24118 Kiel 1, FRG 4GIROQ, Dép. biologie, Université Laval Québec, G1K 7P4, Canada 5Institute of Fisheries and Marine Biology, University of Bergen N-5007 Bergen, Norway

Received on September 16, 1996; accepted on February 24, 1997 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 {small tilde}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.


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