This study was supported by grants 15-29-02447, 15-04-00259 and 16-04-00343 from the Russian Foundation of Basic Research. The transmission electron microscopy investigations were supported by the Russian Scientific Foundation, grant 14-50-00029. The authors would like to thank Elsevier Language Editing Services for editing the English throughout the manuscript, G.A. Kolbasov (N. Pertzov White Sea Biological Station, MSU) for critically reading the manuscript, and J. Bishop (Kuwait Institute for Scientific Research) and S. Garushyants (Institute for Information Transmission Problems, Moscow) for English language editing of sections of the text. The authors would also like to thank G.N. Davidovich, A.G. Bogdanov, and V. Rileeva (Laboratory of Electron Microscopy, MSU) for SEM assistance; S.I. Metelev (Laboratory of Electron Microscopy, I. Papanin Institute of Biology of Internal Waters) and E.V. Vortsepneva (Department of Invertebrate Zoology, MSU) for TEM assistance; and L.V. Ilyash, T.A. Belevich, and I.G. Radchenko (Department of Hydrobiology, MSU) for assistance with diatom identification. Moreover, the authors thank A.A. Semenov (WSBS dive station, MSU) for assistance with the organization of the diving trips and for providing some of the underwater photos; I.A. Kosevich and N.M. Biserova (Department of Invertebrate Zoology, MSU) for assistance with the treatment of the study materials; V.A. Spiridonov (P. Shirshov Institute of Oceanology) for participating in the work planning; and D.A. Ozerov, G.D. Kolbasova, and B.V. Osadchenko (WSBS and the Invertebrate Zoology Department, MSU) for assistance at different stages of this study. Finally, we like to thank two reviewers, Martin Thiel (Universidad Católica del Norte, Chile) and one anonymous reviewer, for their constructive remarks. Their input is highly valued.
Received: 5 september 2016
Revised and accepted: 2 March 2017
Published online: 18 July 2017
Editor: R. Vonk