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tom Vol. 44, No. 3
316--325
EN
Cormorants feed in aquatic ecosystems and transport a large amount of biomass and chemical substances to colonies or roosts situated on land adjacent to the water. This leads to significant enrichment of soils in nutrients. Some loads of nutrients may be transferred to a nearby lake. A long-term impact of cormorants may be followed by the destruction of vegetation beneath the colony. Within a few decades, cormorants lose places suitable for nesting or roosting and abandon the colonies. Then the content of nutrients in the soil decreases and natural regeneration of vegetation occurs. We found that despite the passage of several years since the abandonment of a cormorant colony, the concentration of nutrients in the soil remained high. Groundwater beneath the colony was also strongly enriched with nutrients. Thus, despite the absence of a bird being a source of nutrients, the area of the former colony constantly supplies nitrogen and phosphorus into the nearby lake. The occurrence of vegetation in the area of the former cormorant colony is limited to a few species. Nitrophilous black elder Sambucus nigra, usually creates a dense canopy preventing the light penetration, thereby reducing the growth of other plants.
EN
The paper presents results of geobotanical investigations carried out in the projected “Ciswickie Bagna” nature reserve near Grodziec (eastern Wielkopolska). Rich flora of vascular plants consists of 274 taxons, including 10 species protected by law, e.g. Osmunda regalis L. In 41 plant communities found, 24 are endangered in the Wielkopolska including the E category (dying out, directly threatened with extinction) represented by as many as 7 associations with the most valuable forest community of the reserve Vaccinio uliginosi–Pinetum Kleist 1929 nom. inv.
EN
In the present paper two new localities of the royal fern (Osmunda regalis L.) from Ciświca Nowa and Łomów near Stawisko (Forest District Grodziec) are described. The occurrence of this species in different forest communities is shortly characterized.
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