This article describes the condition of woodpigeon populations in 25 towns and large villages of the Kaliningrad region. The author focuses on the possible reasons for significant differences in the population density of woodpigeon in urban areas and pays attention to the origin of urban populations.
The article offers and an analysis of breeding bird fauna of Kaliningrad incomparison to Polish and one Lithuania cities. A total of 168 species breed in the cities under consideration, 94 (57.7 %) of them are common for all cities. Jacquard's diversity index was used to assess the dependence of species compositionon the geographical location in 10 European cities. The Kaliningrad breeding bird fauna exhibits the greatest similarity with the avifauna of Poznan and the least similarity is with the avifauna of Moscow and Saint-Petersburg. Similarity of species composition reduces as the distance increases
(r = – 0,96; p < 0,001).
This article proves that the individuals of Neomysis integer species can survive dramatic changes in water salinity of 0,2—14 ‰ producing viable posterity. A salinity exceeding 14 ‰ leads to the death of 100% individuals used in the experiment.
This article analyses the zooplankton species composition and species structure in the dumping area. The research was carried out in spring and summer of 1998—2009. Rotifera‚ Copepoda and Cladocera groups of zooplankton were studied. Certain changes to the zooplankton species structure were registered in the dumping area over the 12-year period.
This article describes the effect of three hormonal specimens — two analogues of sex steroid hormones (progesterone and testosterone) and a glycocorticoid hormone prednisolone (dehydrogenated analogue of hydrocortisone) —on the process of regeneration of freshwater planarian Dugesia lugubris Schmidt, 1861. The hormonal specimens differing on chemical nature and physiological activity have differently directed effect on the processes of regeneration. The rate of proliferation generally depends on the quality of recovering body part. This study confirms that planarians are suitable test objects for a study into the effects of chemicals of different nature on regeneration processes.
This article analyses the features of spawning migration of smelt in the rivers Neman and Matrosovka as a background for fishery regulation. The authors identify the period and extend of spawning migration in the rivers in 2011, the dynamics of catches per unit effort, and species composition of commercial catches. The calculation of optimal fishing effort in case of the transition of fishing into the rivers as a result of the ice conditions is presented in the article.