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Sixteen taxa of Gastropoda were found in nine isolated lakes in the Suwalski Landscape Park. The species composition of snails and the number of species were different in individual lakes, but in this group of lakes were similar to those found in the interconnected lakes in this area. Bivalvia were represented by the family Sphaeriidae only.
Snails of Bythinella austriaca agg. from streams in karstic and mountain regions of the Czech Republic (Moravia), Slovak Republic and Poland were examined for larval trematodes. A total of 549 (14.4%) snails were infected and harboured 12 species of cercariae belonging to the families Troglotrematidae, Nanophyetidae, Allocreadiidae, Lecithodendriidae, Microphallidae, and the superfamily Opisthorchioidea. No metacercariae were found in the snails, which indicates that other aquatic invertebrates are used as second intermediate hosts in these areas. It is assumed that Bythinella austriaca agg. plays an important role as the first intermediate host in the life-cycles of trematodes in the Carpathian region of Central Europe.
A population of Hydrobia sp. (Hydrobia ulvae Pennant and Hydrobia ventrosa Montagu) was studied in the Polish coastal zone (up to 3 nautical miles) of the Baltic Sea within the open coast of Polish Middle Pomerania. Abundance, wet biomass, and the frequency of Hydrobia were determined in the coastal waters, including estuaries of the Wieprza, Słupia, Łupawa, Łeba rivers and open coastal in the vicinity of Czołpino (Słowinski National Park) and Władysławowo. The frequency (F) of Hydrobia in the open coast of the Middle Pomerania amounted to 39%, while in the coastal zone of the open sea (Czołpino and Władysławowo) there were no snails. The abundance of Hydrobiidae, in the coastal zone surveyed, ranged from 0 to 398 specimens per m-2 of the bottom ( x = 33.7 spec. m–2). Wet biomass of this bivalve ranged from 0 to 12.0 gww m-2 ( x = 1.0 gww m-2). Apparently Hydrobia sp. has found better conditions for living and development in the estuary Middle Pomerania coast compared to open coastal. The abundance of this gastropods in the estuary zone was 27-fold higher than in the open coast and the wet weight was about 1.5-fold higher, respectively. Hydrobiidae plays an important role in the monitoring of benthos of the Baltic Sea, not constitutes a distinct food base of animals (fish and other hydrobionts).
A total of eight species of furcocercous cercariae of four families (Strigeidae, Diplostomidae, Schistosomatidae and Sanguinicolidae), were found in 2005 in Lake Konnevesi in Central Finland in four snail species (Valvata macrostoma, Lymnaea stagnalis, Bathyomphalus contortus and Planorbarius corneus). Australapatemon burti (Miller, 1923), Australapatemon sp., Cotylurus brevis Dubois et Rausch, 1950, Cercaria spinulosa Ginetsinskaya, 1959 and Sanguinicola sp. are new species records for Finland. Ichthyocotylurus variegatus (Creplin, 1825) and Bilharziella polonica (Kowalewski, 1895) were first recorded as cercariae in Finland. The most common cercariae were A. burti (prevalence 13.3%) and Diplostomum pseudospathaceum Niewiadomska, 1984 (10.0%). Our study represents the first host record of Valvata macrostoma for larval stages of Australapatemon sp. and Sanguinicola sp.
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