Marko Järvinen

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Despite improvements in wastewater treatment systems, the impact of anthropogenic nutrient sources remains a key issue for the management of European lakes. The Water Framework Directive (WFD) provides a mechanism through which progress can be made on this issue. The Directive requires a classification of the ecological status of phytoplankton, which(More)
Phytoplankton data from 606 lakes were used to characterize indicator taxa of near-pristine reference conditions in clearwater and humic lowland lakes of Northern and Central Europe. Reference lakes were selected based on low pressure from catchment land-use, low population density and the absence of point sources. Reference lakes had low phytoplankton(More)
Information included in this publication or extracts thereof are free for citing on the condition that the complete reference of the publication is given as stated above. The environment of the Baltic Sea is unique and fragile. Pollution, fi shing, physical modifi cations, and other human activities exert pressure on a large variety of marine habitats and(More)
Phytoplankton constitutes a diverse array of short-lived organisms which derive their nutrients from the water column of lakes. These features make this community the most direct and earliest indicator of the impacts of changing nutrient conditions on lake ecosystems. It also makes them particularly suitable for measuring the success of restoration measures(More)
The climate is warming and it is most noticeable in the arctic and subarctic areas, where the warming trend is expected to be the greatest. Arctic and subarctic freshwater ecosystems, which are a very characteristic feature of the northern landscape, are especially sensitive to climate change. They could be used as early warning systems, but more(More)
Hydrological conditions are among the most important factors influencing nutrient concentrations in rivers and their fluxes out of the catchments. In the boreal area extreme hydrological conditions are typical with intense floods during the snow-melt period in spring and the base-flow conditions during winter and summer. In this study we compared(More)
Invertebrate predation and trophic cascades in a pe-lagic food web – The multiple roles of Chaoborus flavi-cans (Meigen) in a clay-turbid lake Abstract Invertebrate predators often have dramatic effects on their prey communities. Unlike visually foraging planktivorous fish, invertebrate predators detect their prey by mechano-or chemoreception. Thus, fish(More)
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