The characteristic pattern of multiple colored layers in coastal stratified lakes in the process of separation from the White Sea  

作　　者：Elena D.KRASNOVA Dmitry N.MATORIN Tatiana A.BELEVICH Ludmila E.EFIMOVA Anastasiia V.KHARCHEVA Natalia M.KOKRYATSKAYA Galina N.LOSYUK Daria A.TODORENKO Dmitry A.VORONOV Svetlana V.PATSAEVA 

机构地区：[1]Biological Faculty of Lomonosov Moscow State University [2]Leninskye Gory,1,bld.12,Moscow 119234,Russia [2]Faculty of Geography,Lomonosov Moscow State University [4]GSP-1,Leninskye Gory,1,Moscow 119991,Russia [3]Faculty of Physics,Lomonosov Moscow State University,Leninskye Gory,1,Moscow 119991,Russia [4]N.Laverov Federal Center for Integrated Arctic Research,Russian Academy of Sciences,Severnoj Dviny Emb.23,Arkhangelsk 163000,Russia [5]A.A.Kharkevich Institute for Information Transmission Problems,Russian Academy of Sciences,Bolshoy Karetny Per.19,bld.1,Moscow 127051,Russia [6]A.N.Belozersky Institute of Physico-Chemical Biology,Lomonosov Moscow State University,Leninskye Gory,1,Bld.40,Moscow 119991,Russia

出　　处：《Journal of Oceanology and Limnology》2018年第6期1962-1977,共16页海洋湖沼学报（英文）

基　　金：Supported by the RFBR(Nos.16-05-00548-a,16-05-00502-a)

摘　　要：An unusual feature of the saline stratified lakes that were formed due to ongoing postglacial uplift on the White Sea coast is the presence of several differently colored thin layers in the zone with sharp gradients. Colored layers in five lakes at various stages of separation from the sea were investigated using optical microscopy, spectrophotometry, spectrofluorimetry, and photobiology. The upper greenish colored layer located in the aerobic strata of all lakes near the compensation depth of 1% light penetration contains green algae. In the chemocline, another layer, brightly green, red or pink, is dominated by mixotrophic flagellates. Despite the very low light intensities and the presence of H 2 S, active photosynthesis by these algae appears to be occurring, as indicated by high values of the maximum quantum yield of primary photochemistry, electron transport activity, photosynthetic activity of photosystem II, the fraction of active centers, and low values of heat dissipation. In the reduced zone of the chemocline, a dense green or brown suspension of anoxygenic phototrophs(green sulfur bacteria) is located.An unusual feature of the saline stratified lakes that were formed due to ongoing postglacial uplift on the White Sea coast is the presence of several differently colored thin layers in the zone with sharp gradients. Colored layers in five lakes at various stages of separation from the sea were investigated using optical microscopy, spectrophotometry, spectrofluorimetry, and photobiology. The upper greenish colored layer located in the aerobic strata of all lakes near the compensation depth of 1% light penetration contains green algae. In the chemocline, another layer, brightly green, red or pink, is dominated by mixotrophic flagellates. Despite the very low light intensities and the presence of H 2 S, active photosynthesis by these algae appears to be occurring, as indicated by high values of the maximum quantum yield of primary photochemistry, electron transport activity, photosynthetic activity of photosystem II, the fraction of active centers, and low values of heat dissipation. In the reduced zone of the chemocline, a dense green or brown suspension of anoxygenic phototrophs(green sulfur bacteria) is located.

关 键 词：ALGAL BLOOMS COASTAL LAKES CHEMOCLINE fluorescence kinetics Arctic White Sea 

分 类 号：P[天文地球]