Vacant niches in nature, ecology, and evolutionary theory: a mini-review Eff ect of Ni2+ on phenoloxidase activity of micromycetes Nest-site use by Black Stork and Lesser Spotted Eagle in relation to fragmented forest cover: case study from Lithuania Effects of artificial soil drought on Scots pine fruiting, seed vitality, and pollen germination Distribution of sand hoppers (Talitrus saltator, Montagu, 1808) on the beach of the Lithuanian Baltic Sea Impact of environmental conditions on smelt catch fluctuations in the Nemunas River and the Curonian Lagoon Sitodiplosis mosellana – a new winter wheat pest in Lithuania Influence of substrate on biological removal of phosphorus Home allergies among 5th–9th grade schoolchildren in Vilnius, Lithuania Tetrad-forming-organism-dependent deterioration of enhanced biological phosphorus removal in a full-scale wastewater treatment plant Pro memoria. Professor Juozas Virbickas (1939–2006)