Spatial and annual variability of environmental and phytoplankton indicators in Lake Võrtsjärv: implications for water quality monitoring; pp. 227–246

Vertical variability of pelagic zooplankton fauna in deep Latvian lakes, with some notes on changes in ecological conditions; pp. 247–264

Comparison of soil microorganism abundance and diversity in stands of European aspen (Populus tremula L.) and hybrid aspen (Populus tremuloides Michx. × P. tremula L.); pp. 265–292

SHORT COMMUNICATION. Rapid establishment of the alien crab Rhithropanopeus harrisii (Gould) in the Gulf of Riga; pp. 293–298