Representatives of the mesostigmatid mite subfamily Arctoseiinae (Acari: Mesostigmata: Gamasina: Ascidae) held in the Museum für Naturkunde Berlin are documented. This material stems from the extensive Wolfgang Karg collection and originates primarily from (eastern) Germany, as well as Sweden, Chile and New Caledonia in the Pacific. Here, we record seventeen Arctoseiine species in Berlin, including type material of the following seven species: Arctoseius brevichelis Karg, 1969, A. dendrophilus Karg, 1969, A. pristinus Karg, 1962, A. resinae Karg, 1969, A. sessiluncus Karg, 1965, Zerconopsis apodius Karg, 1969 and Iphidozercon validus Karg, 1996.

Investigations were carried out in a pine stand 80 years of age, 24 cm average diameter of breast height and 22 m tall. Both long-timber and medium-length assortments 1.8 and 2.4 m long were harvested. The performed analyses comprised: mean duration times at individual activities during operating time, structure of the operation time, as well as labour consumption during this time. The impact of the length and diameter of the harvested long timber on the above-mentioned characteristics of the harvesting process was assessed. Measurements of operation times were taken with the assistance of a stopwatch using the method of continuous timekeeping. Times of the following operations were identified and measured: site preparation, felling, fastening of the self wind-up measuring tape, cutting logs into assortments, measurement, returning to the end of the handled bole, cutting into rollers, walking over to the next tree to be felled. The obtained results of the investigations revealed statistically significant differences of mean duration times and mean shares of some operations in groups of trees of differing length and diameters. In the structure of the operating time, the highest shares were recorded for roller cutting and measurements. It was found that the diameter of the handled long timber exerted the strongest influence on the labour consumption of the harvested timber.

A list of vascular plants in the planned reserve “Gorajskie Parzyska” is presented in this paper. 226 taxa out of 152 genera and 57 families of vascular plants were inventoried. The most representative families are: Fabaceae, Asteraceae, Poaceae, Rosaceae, as well as Salicaceae, Caryophyllaceae, Cyperaceae, Lamiaceae, Apiaceae, Ranunculaceae and Scrophulariaceae. There were 19 species catalogued as species of special care as they are under total or partial legal protection and are listed on the Polish National Red List and on Regional Red List for Wielkopolska. The study area (9.26 ha) seems to be particularly valuable in comparison to the rest of Czarnkowska Moraine to other stands where endangered or protected species were found.

Using GIS techniques, spruce bark beetle Ips typographus (L.) damage was analysed against distance from the edge of small spruce stands with strict protection regime; for reference damage nearby managed spruce stands was used. Mean volume of spruce timber, harvested with sanitary fellings was significantly higher near spruce stands with strict conservation status (14.7 ±2.1 to 17.0 ±3.8 m³ /ha) than in the vicinity of managed control sites (9.9 ±0.4 to 11.5 ±0.8 m³ /ha). Under endemic spruce bark beetle population levels strict conservation regime in small areas (forest woodland key habitats of average 3.7 ha size) was found to be Ips typographus hazard for adjacent spruce forests up to 450 m distance.