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Land snails as indicators of soil humidity in Danubian woodland (SW Slovakia)

100%

Cejka T. , Hamerlik L.

tom Vol. 57, nr 4

741-747

Moisture along with available calcium content are the major environmental factors controlling species richness and composition of the terrestrial molluscan fauna. In the present study, we focused on snails in a floodplain forest and their response on humidity. We described the model of response and calculate the humidity optima of particular species if possible. Generalised linear model (GLM) combined with Poisson distribution was used to ch aracterise the change of species abundance along a humidity gradient. From 31 species tested, 21 have shown significant response to humidity. The majority of specie s tested had unimodal response, four species showed monotonic regression type. Based on their humidity optima, species distributed along a moisture gradient belonged to three main ecological groups: (i) mesohygrophilous woodland species living mostly in non-inundated areas with humidity optima below 4, (ii) hygrophilous, forest hygrophilous and euryhygric species with optima between 4 and 6 and (iii) strongly hygrophilous (polyhygrophilous) species with mois ture optima above 6. Estimated moisture preferences for Danubian floodplain woodland land snail fauna would be a useful tool in a longterm biological monitoring of changing moisture regime.

New records of the Mediterranean land snail Massylaea vermiculata (O. F. Müller, 1774) in Hungary and Slovakia

80%

Pall-Gergely B. , Feher Z. , Cejka T.

nr 4

Molluscs of the Bukovske vrchy Mts in the Slovakian part of the Vychodne Karpaty Biosphere Reserve

51%

Jurickova L. , Lozek V. , Cejka T. , Dvorak L. , Horsak M. , Hrabakova M. , Mikovcova A. , Steffek J.

tom 14

nr 4

91 mollusc species were recorded from 92 sites in the Bukovské vrchy Mts (Slovakia) as a result of the recent malacological research, combined with earlier published and unpublished data. The most important communities of predominantly East Carpathian species occur throughout the deciduous woodlands dominated by beech. The mollusc communities are characterised by low numbers of individuals dispersed over large areas. Rich malacocoenoses are confined to scattered favourable habitats, such as well vegetated base-rich seepages, landslide scars and water-logged depressions, as well as at fresh calcareous outcrops or screes. A detailed snail succession from Holocene slope sediments at the Krivoštianka (Humenské vrchy Mts) provides the most complete record from the Slovak East Carpathians and is the most detailed yet published from this region. The mollusc succession differs from the standard faunal developmental pattern of Central Europe due to the absence of a considerable number of common Central European species, whose succession is well known at present.