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Founder population size and number of source populations enhance colonization success in waterstriders
- P. Ahlroth, R. Alatalo, Anna-Liisa Holopainen, T. Kumpulainen, J. Suhonen
- Environmental ScienceOecologia
- 8 October 2003
It is demonstrated clearly that both the larger propagule size and the high number of source populations have positive effects on the probability of colonizing a new stream, and it may be essential to consider also the diversity of genetic origin for colonization success.
Long-term fluctuations in environmental conditions, plankton and macrophytes in a humic lake, Valkea-Kotinen
The results demonstrated that weekly observations are, in most cases, necessary for finding interrelationships between hydrological and biological factors in small headwater lakes.
An introduction to the limnology of the Finnish Integrated Monitoring lakes
The limnological monitoring of the lakes in the Finnish Integrated Monitoring catchment areas was started in 1990 in order to study the effects of airborne pollutants on ecosystems. The four pristine…
Type-specific and indicator taxa of phytoplankton as a quality criterion for assessing the ecological status of Finnish boreal lakes
Effects of forestry practices on water quality and primary productivity in small forest brooks
Intercalibrations of freshwater phytoplankton analyses
The comparability of phytoplankton analyses (Utermohl method) between professional and non-professional analysts was tested and the coefficient of variation was highly variable, 10%-42% for professionals and 8%-57% for non-professionals.
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.
Seasonal succession, vertical distribution and long term variation of phytoplankton communities in two shallow forest lakes in eastern Finland
Two pristine forest lakes have been sampled for 12 years in order to follow the long term variation of phytoplankton biomass and species composition together with environmental parameters; more variation was found in the unstratified Lake Iso Hietajärvi compared to the smaller stratified lake.
Temporal and spatial heterogeneity of pelagic plankton in Lake Pyhäselkä, Finland
1) Ecological Research Institute, Faculty of Biosciences, University of Joensuu, P.O. Box 111, FI-80101 Joensuu, Finland (*corresponding author’s e-mail: Markku.Viljanen@joensuu.fi) 2) Institute of…
Interacting in the dark: a study of the diel vertical migrations of pelagic plankton and fish in Lake Ladoga
- M. Rahkola, V. Avinski, Anna-Liisa Holopainen, J. Jurvelius, J. Karjalainen, M. Viljanen
- Environmental Science
In Konevits the lower temperature in the metalimnion, where the daytime zooplankton maximum occurred, and evenly distributed food resources may have limited zoopLankton migration, despite the existing predation pressure.