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In this study, eight forest associations in Szczecin Landscape Park and in the vicinity were examined for the presence of ant species. The only species present in all the associations was Myrmica ruginodis. Habitat conditions in the beech forest (Galio odorati-Fagetum), which grows on post-glacial hills, was diversified enough to enable occurrence of as many as 16 ant species. There was no substantial difference in ant species composition between beech and mixed forests. Alder swamps and riparian forests seemed to provide unfavourable living conditions for ants and only 3 ant species were recorded in these environments. Results show that indicating the type of plant association alone may be insufficient to characterize the environmental conditions that affect ant occurrence.
The aim of the present study was to determine how internal diversity of oak-hornbeam forest modifies the course and effects of infestation of small-flowered balsam (Impatiens parviflora) with rust Puccinia komarovii. The study investigated the effect of the disease on the demography of the population, and the habit and biomass allocation of the infested specimens, as well as the initiation of non-specific defense mechanisms. It was shown that: 1) the percentage of infected specimens was independent of the undergrowth-coverage rate and of the I. parviflora density; 2) infected populations differ from healthy ones in the seasonal dynamics of abundance changes; 3) high mortality is observed as early as May and the first part of June, i.e. it pertains to specimens, which did not begin reproduction; 4) the presence of infection and its intensity stimulate the growth of the stem and the hypocotyl; 5) fresh weight of infected specimens is by almost 30% lower in comparison to the weight of uninfected plants; the weight of badly infected plants decreases by 20% in comparison to the less severely infected balsam plants; the weight of generative organs drops most significantly, even by over 50%; 6) biomass allocation does not fluctuate considerably; 7) reproduction effort expressed by the ratio of the weight of fruits (or only seeds) to the total biomass shows a distinct downward trend; 8) the environmental factor does not affect the force of defense mechanisms, the strength of biochemical response of diseased plants depends on the degree of their infestation.
In the present paper records for 36 species of Steninae from the Puszcza Borecka are given. 10 of them are for the first time recorded from the northeastern part of Poland. Puszcza Borecka is a second lowland locality of Stenus eumerus KIES in Poland. The presence of many rare species indicates the natural character of forest associations of Puszcza Borecka.
In the paper records for 37 species of Elateridae, 2 species of Throscidae and 2 species of Eucnemidae from Puszcza Borecka are given. Nine of them are for the first time recorded from the north-eastern part of Poland. Puszcza Borecka is the first lowland locality of Liotrichus affinis (PAYK.), which was known in Poland only from mountains. The presence of many rare species, like Denticollis rubens PILL. et MITT. and Xyloecus corticalis (PAYK.), provides an evidence of primary character of forest associations of Puszcza Borecka.
The paper presents results of floristic research of vascular plants in the nature reserve “Cisy” located near Bardo town in Bardo Mts (south-western Poland). Altogether 144 species have been found. Some of them are rare and threatened in Poland, e.g. Cephalanthera longifolia, Dactylorhiza sambucina, Neottia nidus-avis, Platanthera bifolia and Taxus baccata.
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