TY - JOUR N2 - Species composition and density of Gastrotricha in bottom sediments were studied, on an annual basis, in the littoral of the mesotrophic Lake Piaseczno (Łęczyńsko-Włodawskie Lakeland). The number of species from spring to autumn remained on the same level (from 24 in spring to 22 in autumn), but in winter in littoral of the lake there were recorded only 8 species. Species diversity expressed by the Shannon index, in spring, summer and autumn was high and amounted 2.86; 2.69 and 2.77 respectively. In winter the value of the index was significantly lower and amounted 1.80. In individual seasons the mean density of Gastrotricha valued from 50 103 indiv. m-2 during winter to 1238 103 indiv. m-2 in spring. The density of Gastrotricha in spring was more than 24 times higher than that winter. There were no significant differences in species diversity Gastrotricha from spring to autumn, although the peak abundance was recorded in the spring. It is necessary to add, that the density of Gastrotricha during the spring peak was one order of magnitude higher from that in summer and autumn. The similarity of the fauna found in winter to the fauna occurring in other seasons, is significantly low, ranging from 24 to 27%. Seasonal changes in amount and diversity of the gastrotrich fauna are probably the result of temperature changes and food availability. L1 - http://www.czasopisma.pan.pl/Content/107211/PDF-MASTER/7%20Nesteruk.pdf L2 - http://www.czasopisma.pan.pl/Content/107211 PY - 2015 KW - Gastrotricha KW - seasonal changes KW - diversity KW - density A1 - Nesteruk, Teresa PB - Oddział PAN w Lublinie VL - Vol XII DA - 2015[2015.01.01 AD - 2015.12.31 AD] T1 - Seasonal changes in the diversity and abundance of gastrotricha in bottom sediments of the littoral of a mesotrophic lake UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/107211 T2 - Teka Komisji Ochrony I Kształtowania Środowiska Przyrodniczego ER -