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Changes in juvenile rainbow trout (Oncorhynchus mykiss Walb.) gills at different times after transfer to a brackish water (4-7‰) culture in the Puck Bay were followed. Total gill tissue mounts as well as thin and ultra-thin sections were examined. Acute inflammation of the gill tissue, observed initially, receded after 2 weeks of adaptation. After 2 months in the culture, the gill structure was transformed, the transformations involving, i.e. increase in the activity and number of chloride cells and increase in the gill epithelium intercellular spaces.
Trophic relations for larvae of 68 species of longhorn beetles were determined, based mainly on my own field studies carried out between 1999 and 2002 within the Tenczyński Landscape Park in the Kraków Upland (southern Poland). The list of host plants for Cerambycidae larvae includes 46 taxa (mainly at the species level), chiefly trees and shrubs, classified within 13 categories of the breeding material.
Data on the occurrence of some Lepidoptera species inhabiting nest boxes of the tawny owl (Strix aluco L.) are given.
As a result of the research carried out in 1983-1993 (with consideration for the results of the research conducted before WWII by German entomologists) in the Bielinek forest-steppe reserve 57 species of click beetles were found (Elateridae, Eucnemidae, Throscidae). The zoogeographical and ecological characteristics of click beetles fauna of the area was presented. As a result a high share of species related to Submeridian-Atlantic climate was found in the reserve as well as the species which in terms of range are included in the Ponto-Mediterranean and Mediterranean elements. A hypothesis on the origin of the click beetles fauna of the area was presented. It was stated that the species that are climatic relicts (late Pleistocene and previous periods of Holocene) are very poorly represented in the fauna (2 species related to forest-steppe habitats: Porthmidius austriacus and Melanotus crassicollis). The species that are habitat relicts of natural forests (e.g. Lacon querceus, Limoniscus violaceus, Stenagostus rhombeus, Hypoganus inunctus, Ischnodes sanguinicollis, Brachygonus dubius, Ampedus cardinalis, Elater ferrugineus, Isorhipis melasoides) are much more numerous. Taking the above into consideration it was found that the fauna of click beetles of the Bielinek reserve has a specific, unique character and in this respect the reserve can be counted among the most valuable refugia of unique fauna in Poland, and probably also in Europe.
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