Mollusc (Mollusca) assemblages in the littoral of Lake Barlineckie (Mysliborz Lakeland)
2003
Agapow, L. | Piekarska, A. (Academy of Physical Education in Poznan, Gorzow Wielkopolski (Poland). Dept. of Biology and nature Conservation)
Numerous springs well up on the southern slopes and in the shallow littoral of the lake, for this reason, water temperature of Lake Barlineckie is lower in summer and higher in winter than that in other lakes. Collections for this work were made in spring and summer of the years 1992-95. Molluscs were collected down to the depth of 80 cm from 9 sites, using a scoop net and by examining aquatic plants and submerged objects. Samples from transects I, II, and III were collected with a 400 square cm Ekman-Birge grab, at 1 m depth intervals down to 8 m. The study was aimed at describing the mollusc (Mollusca) fauna of 5 selected plant species representing assemblages of helophytes, nymphaeids, and elodeids in the shallow littoral of Lake Barlineckie, vertical distribution of the molluscs was examined as well. The collection consisted, overall, of 9 308 individuals contained in 110 samples. A total of 26 gastropod (Gastropoda) and 20 bivalve (Bivalvia) species were identified. In Lake Barlineckie, gastropods were mainly associated with plants: 60 percent of all individuals were collected from them. Phragmites australis, Potamogeton perfoliatus, Ceratophylum demersum, Myriophyllum spicatum, and Nuphar lutea supplied 22, 16, 10, 8, and 4 percent of the total number of gastropods, respectively. In terms of the species richness, the highest number of species was found on N.lutea (23 species), the lowest species richness being typical of P.australis (13 species)
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