The areas of northern Poland are typical examples of recently formed post-glacial landscapes with a very large number of small ponds. Phycology of these ponds has been seldom studied, especially when compared to data collected from lager post-glacial lakes. The aim of our study was to determine the importance of small ponds to the biodiversity of algae. In 1996-2002 and 2012-13, we carried out phycological studies in 20 small ponds located in fields and forests. During the study period, we recorded the presence of 503 taxa of algae. The flora of algae was unique in each pond. Another important and frequent observation was the total and rapid “rebuilding” of algal flora. Statistical analyses revealed some other important facts, including the importance of small ponds to algal biodiversity. The average number of taxa recorded during the studies of individual water reservoirs was 56, thus much less than usually recorded in typical large lakes. But when we take the large number of small ponds into consideration, it appears that they represent more than 97% of the populations of algae and for this reason they are important to the biodiversity of algae.
Niektóre postępowania administracyjne z zakresu ochrony środowiska wymagają specjalistycznej wiedzy przyrodniczo-technicznej, której nie zawsze można wymagać od zatrudnionego w organie administracji pracownika. Może to dotyczyć m.in. decyzji o środowiskowych uwarunkowaniach, wydawanej po przeprowadzonej ocenie oddziaływania na środowisko, pozwolenia zintegrowanego czy nawet decyzji o wymierzeniu administracyjnej kary pieniężnej za usuwanie drzew lub krzewów bez wymaganego zezwolenia.
On the basis of preliminary phycological analysis 122 taxa of algae were identified in seven selected natural field and midforest water bodies on the southern border of Świecie Height. Green algae Chlorophyta belonging to the genus Volvox which caused blooms in some field ponds and Euglenophyta belonging to the genus Trachelomonas causing blooms in one of the midforest reservoirs studied were the prevailing groups. Owing to both algal and phytosociological analysis of vascular flora in the context of physicochemical conditions, it was possible to determine the structure of phycoflora differentiation and the trophy of the surveyed astatic reservoirs in relation to water level fluctuations in permanent and periodic water bodies.
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