Tadas Ivanauskas and Pranciškus Baltrus Šivickis – founders of the fundamentals of ecological science in Lithuania Lethal effects of Zn, Cu and their mixture on the medicinal leech (Hirudo verbana) Experimental research into the dispersion of railway traffic noise in the environment and its modelling Mobilisation of Cu from soils by dissolved natural and processed humic substances Diffusion of Bacillus thuringiensis bacteria and their effect on aquatic invertebrates in the Nemunas River after using VectoBac 12AS preparation Comparison of fine-scale spatial distribution and nest-site selection in great crested grebe (Podiceps cristatus) and coot (Fulica atra) Distribution of juvenile river lamprey (Lampetra fluviatilis L.) in different habitats Ecological assessment of agrotechnical measures in sandy light loam soils Dispersion modelling of solid particles from vehicle exhaust into the atmosphere Fish community changes in the cooler of the Ignalina Nuclear Power Plant The effect of ZeoVit sorptive features on nitrogen compounds, heavy metals and biological activity changes in sewage sludge Kronika Book review