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Aellen Ajax album algal Alhonen archipelago archipelago and sea Armijarvi August Baltic deep water Baltic Sea biomass blue-green algae brackish Cerealia Chenopodium chlorophyll concentration curve decreased depth Desmids diatoms dinoflagellate early Ekenas euphotic layer Gronblad Gulf of Finland Halme halocline Helsingfors Helsinki Huittinen hypolimnion increase inflorescence influxes inner archipelago July June late summer Lehijarvi lower Luther maximum measured mg C/m2 Niemi nitrate nitrogen nitrogen nutrients occurred oligohaline surface orthophosphate outflow oxygen palustris peak permanent halocline phosphorus phyto phytoplankton phytoplankton biomass Picea plankton plants Pojoviken pollen primary production salinity samples sea zone seaward Secchi disc seeds settlement silicate silicon Simola Skaldo species specimens stations Storfjarden and Ajax stratification suecicum summer minimum stage surface layer Svarta temperature thermocline total phosphorus turbidity Tvarminne area Uherkovich Uotila upwelling values variation Vehmaa vernal bloom vernal phytoplankton bloom Vihti vulgaris Vuorela water column winter