The trophic state of Lake Ladoga as indicated by late summer phytoplankton

  title={The trophic state of Lake Ladoga as indicated by late summer phytoplankton},
  author={Anna-Liisa Holopainen and Pertti Huttunen and Galina I. Letanskaya and Elena V. Protopopova},
As a part of the joint Russian-Finnish evaluation of human impact on Lake Ladoga, we studied the phytoplankton of the lake in order to find biological indicators for eutrophication. A second aim of the investigation was intercalibration of sampling and phytoplankton counting techniques between the Russian and Finnish laboratories. Phytoplankton samples were collected from 27 sampling stations in the lake and from the rivers Volkhov and Neva in 9–13 August 1993. In surface water samples the… 
Effects of nutrient load on species composition and productivity of phytoplankton in Lake Ladoga
In the 1990s the tendency has been towards decreasing phosphorus content (1992-95 mean 18 mg m -3 ), but the changes in phytoplankton productivity between years were connected mainly with temperature.
Ecological state and monitoring of limnological and biological parameters in Lake Ladoga, Russia
Lake Ladoga (17 891 km 2 ) is the largest lake in Europe, with a 258 000 km 2 drainage area that extends to much of north-western European Russia and eastern Finland. Its ecosystem has been
Human impact on Lake Ladoga as indicated by long-term changes of sedimentary diatom assemblages
The river sediment assemblages reflect patterns in the riverine inflow quality related to catchment geology and effluent loading, and appear most pronounced near the discharge sites of industrial and municipal effluents and main river inflows.
The present state of Lake Ladoga, Russia — a review
Until the carly 1960s, Lake Ladoga was oligotrophic and characterized by good water quality, but within the past 20-30 years, as a result of human impact, the ecological state seems to have deteriorated, with elevated nutrient concentrations and decreased transparency.
Seasonal succession of phytoplankton in Lake Ladoga
Both water quality and phytoplankton in Lake Ladoga have been studied since the 1960s. Spatial distribution and long-term variation of phytoplankton are well known in this lake (PETROVA 1987,
Trophic gradients and associated changes in the plankton community in two bays of Lake Ladoga
Simultaneous analyses of water quality parameters, and the composition of phytoplankton, crustacean and rotifer assemblages were done at two sampling areas in Lake Ladoga: the Sortavala Archipelago
Integrated monitoring of Lake Ladoga, Russia
Lake Ladoga (17,891 km') is the largest lake in Europe; its mean depth is 47 m, maximum depth 230 m, and its 258,000-km' drainage area extends to much of north-western European Russia and eastern
Species diversity and spatial distribution of the summer rotifer assemblages in Lake Ladoga
The filter-feeding microphagous rotifers Conochilus unicornis and Keratella cochlearis dominated most of the microzooplankton communities in the northern parts of the lake, while grasping phytophagous species of the genus Polyarthra predominated in the central and south-eastern parts.
Plankton community structure during the vernal thermal front in southern Lake Ladoga, Russia
A thermal har is a shore-parallel front which separates descending waters at or near the fresh water temperature o f maximum density ( 4 °C) during the spring_ and au~ seasons (GBAH & MURTHY 1998).


Zur Vervollkommnung der quantitativen Phytoplankton-Methodik
SynopsisAll the important questions in counting phytoplankton are reviewed. The methods described refer primarily to fresh water but are applicable to marine phytoplankton as well. No attempt has
The Practical Handbook
Seasonal and spatial distribution of cryptophycean species in the deep, stratifying, alpine lake Mondsee and their role in the food web
Quantitative data are presented on the depth-time distribution of four cryptophycean species over a three year investigation period in Mondsee, Austria, a deep, stratifying alpine lake, where cryptophyceans contribute considerably to plankton community dynamics.
Algae as monitors of heavy metals in freshwaters
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