Abstract
Direct observations of the plankton vertical distribution performed from a manned submersible were made in the Charlie-Gibbs Fracture Zone (Atlantic Ocean). Plankton was counted using a standard 3-m2 frame in the depth layer from 170 to 4361 m and plotted for every 50 m. The most abundant components of the macroplankton were pelagic shrimps, chaetognaths and gelatinous animals, with peak of densities corresponding to the main pycnocline. Mucous houses of appendicularians were abundant at 150 m above the seabed—up to 0.07–0.09 m−3, compared to 0–0.006 m−3 in the upper layers. The new observations confirm that the near-bottom peak of appendicularian abundance is characteristic of at least the entire Central Atlantic, and it is not associated with certain biotopes on the bottom.
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Notes
Hydrological data were gathered by Dr. D.L. Aleynik at stn 4358 during the night before the submersible’s dive.
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Acknowledgements
The author expresses his deep gratitude to V.A. Nishcheta, who piloted the “Mir-1”, to Dr. D.L. Aleynik (P.P. Shirshov Institute of Oceanology) for advice on hydrology and for providing hydrological data obtained by the “Rosett” complex, and to the “Mir” team and the captain and crew of the R.V. “Akademic Mstislav Keldysh”. The author would like to thank the reviewers of this manuscript for their very useful comments.
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Communicated by O. Kinne, Oldendorf/Luhe
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Vinogradov, G.M. Vertical distribution of macroplankton at the Charlie-Gibbs Fracture Zone (North Atlantic), as observed from the manned submersible “Mir-1”. Marine Biology 146, 325–331 (2005). https://doi.org/10.1007/s00227-004-1436-1
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DOI: https://doi.org/10.1007/s00227-004-1436-1