Mon, 31 Oct 2016 16:00:00 +0100This paper presents the results of a malacological survey of the selected oxbows of the Elbe River in Eastern Bohemia (Czech Republic) near the town of Pardubice in 2016. The changes in molluscan assemblages observed based on the comparison with the previous research, conducted more than 10 years ago, are described. Altogether 23 species of freshwater molluscs (20 gastropods, 3 bivalves) were found at 7 sites in five protected areas. Investigated sites were divided into three groups according to the changes of mollusc assemblages: (1) without any significant changes; (2) changes promoted by succession; (3) changes hard to explain. High fish stock, shading and succession are considered to be the main factors driving the variation of the studied mollusc assemblages.
Thu, 30 Jun 2016 23:00:00 +0100Tandonia kusceri (Wagner, 1931) is reported from Slovakia for the first time. The slug was found in the Ružinov and Petržalka housing estates, Bratislava, in 2014 and 2015, respectively. Our observations suggest that the species is well established in the Slovak capital. This finding calls for verification of some of the older reports of a similar species Tandonia rustica beyond the eastern border of its native range. Owing to unresolved taxonomic issues, the name T. kusceri should be applied only tentatively.
Tue, 10 May 2016 20:00:00 +0100Two new records of Laciniaria plicata (Draparnaud, 1801) from western Bohemia are presented. All previous records are summarised and the distribution in western Bohemia is briefly discussed.
Thu, 24 Dec 2015 00:30:00 +0100This paper presents the research of mollusc communities in the floodplain of Hamerský potok Brook (Nežárka River tributary, South Bohemia, Czech Republic). Altogether, 42 mollusc species (39 species of gastropods, three species of bivalves) were recorded in the study area during the research in 2015, representing 17% of the total Czech malacofauna. More than a half of all species represents common forest species, but several sensitive woodland species as Causa holosericea, Ena montana and Macrogastra plicatula and the vulnerable wetland species, such as Euconulus praticola were also found. The occurrence of these rare species (three near threatened and one vulnerable) makes the valley of Hamerský potok Brook an important mollusc refugium of prime conservation importance in this fragmented Bohemian landscape of a long-term agricultural land-use.
Mon, 21 Dec 2015 02:00:00 +0100European snail Helix pomatia Linnaeus, 1758 has been widely introduced in Central Russia. The history of the introduction and review of the recent distribution of the species are presented. Possible ways of the introduction of this species are discussed.
Tue, 13 Oct 2015 23:00:00 +0100A total of 95 species of molluscs were recorded in the Kačák brook valley (Central Bohemia, Czech Republic), in its upper and middle part. Most of the terrestrial survey was conducted in the woody part of the studied area, therefore woodland gastropods represent 31% of the total species number, followed by generalists, hygrophilous and steppe species. Only a few species belong to aquatic molluscs. Twenty four species belong to the Red List of mollusc species in the Czech Republic. Critically endangered Anisus vorticulus, endangered Pisidium amnicum and Unio crassus represent aquatic species. Very attractive are wetlands and marshes in the Kačák brook catchment area, hosting two vulnerable species: Vertigo angustior and V. antivertigo.
Mon, 14 Sep 2015 12:00:00 +0100This paper brings findings of recent malacological research (2013) and earlier mostly unpublished data about malacofauna of the Karlštejn National Nature Reserve (abbreviated as NNR) (Czech Republic, Central Bohemia, Bohemian Karst Protected Landscape Area). A total of 89 mollusc species (76 terrestrial snails, 5 freshwater snails, 8 bivalves) were recorded. The mollusc fauna of the NNR represents 35% of the total of 251 mollusc species found in the Czech Republic. The studied area comprises of very diverse habitat types with various and rich mollusc communities. Forest snails are dominating (38%) followed by species of the open steppes (27%). 28 species belong to endangered Red List species of the Czech Republic. Critically endangered Helicopsis striata and endangered Chondrina avenacea, Truncatellina claustralis and Zebrina detrita belong to the species of dry and open habitats. Helicopsis striata is probably extincted in most of localities in the Bohemian Karst. Its presence in the NNR was not confirmed. Bohemian Karst holds most of populations of Chondrina avenacea in the Czech Republic and the most of findings are situated in the Karlštejn NNR. Zebrina detrita inhabits here isolated site in Bohemia, where it was probably introduced in the past. Four new sites of the Holocene optimum relict Truncatellina claustralis were found.
Mon, 26 Apr 2015 20:00:00 +0100Chondrina tatrica Ložek, 1948 is reported for the first time for Romania. The species was thought to be endemic to the Western Carpathian Mountains. The Romanian locality (Boga valley, Bihor County) is situated approximately 260 km from the nearest known site of the species in a straight line. The zoogeographical significance of this finding and the possible route of the ancestors of C. tatrica to the Carpathians is discussed.
Tue, 21 Apr 2015 21:00:00 +0100In the autumn of 2014, we conducted a malacological survey at 23 freshwater bodies in the Danubian lowland, SW Slovakia. We aimed to conduct a malacological inventory of semi-natural sites of a high conservation value. During the fieldwork, we used conventional methods of sampling; mostly sweeping by a hemispherical metal kitchen strainer from both natant and submerged vegetation and also from bottom sediments. At each site, ten people have collected molluscs for 60 to 90 minutes (except site No. 3, 5 and 15 – 1 person/2 hrs.). During the sampling we did not use any destructive methods. A total of 67 species were found in the whole surveyed territory (43 gastropods, 24 bivalves), which is the complete current species richness of the aquatic mollusc fauna in the Danubian lowland. The most species rich sites include the Číčovské rameno Oxbow lake (36 species, No. 2), Klátovské rameno Side arm (32 spp., No. 10) and Parížske močiare Swamp (24 spp., No. 11). Bithynia tentaculata and Planorbarius corneus were the most frequent species (i.e. found at +65% of sites) and the following eight species were recorded at 44–52% of sites (i.e. 10–12 individual sites; given in a descending order): Anisus vortex, Lymnaea stagnalis, Planorbis planorbis, Anisus vorticulus, Bithynia leachii, Stagnicola palustris, Viviparus acerosus and V. contectus. In contrast, Bithynia transsilvanica, Gyraulus riparius, Pisidium personatum, Planorbis carinatus, Sphaerium nucleus and Valvata macrostoma were found at only one site (species recorded only in flood debris of the Danube River were not considered).
Sun, 11 Jan 2015 12:30:00 +0100A live specimen of Selenochlamys was collected in a cave on the Ai-Petri massif of the Crimean Mountains in 2014. It is described and compared with the first Crimean specimen that was collected in 1989 on the Babugan massif. Both specimens are juvenile. Both seem to be more similar to S. ysbryda than S. pallida, and are considered as S. cf. ysbryda. Distribution and habitat preferences in Crimea are discussed. A second finding of Selenochlamys in Crimea suggests the first was not accidental and this slug is likely to be native in Crimea.
Thu, 18 Dec 2014 21:00:00 +0100A numerous population of the Turkish snail (Helix lucorum L.) (Mollusca: Gastropoda) has been found for the first time in the Slovak Republic (Bratislava City, April 2013).
Tue, 18 Nov 2014 23:00:00 +0100A malacozoological survey of the molluscan fauna in 21 selected wetland habitats was carried out in the White Carpathian Mts. in 2010–2014. In total, 66 species of gastropods (5 aquatic) were confirmed at the surveyed sites. Viable populations of two species of European importance were confirmed (Vertigo moulinsiana and V. angustior).
Fri, 4 Jul 2014 22:30:00 +0100In this paper we report an observation of an interesting behaviour of the Roman snail Helix pomatia. Two groups of several dozens of individuals were found in a beech forest in the Veľká Fatra Mts. (Central Slovakia) on May 2014. Both sites had an open tree canopy with sparse and low herbaceous vegetation. Approximately 25–35 individuals per 20–30 square meters were found there, while several pairs of them were attached with their feet together. This observation brings several questions related to species behaviour and reproductive strategy.
Sun, 25 May 2014 22:30:00 +0100I present a report of the European species Cepaea vindobonensis in the Moscow region of Russia. This is the first known population of this species in the central part of European Russia. Possible methods of dispersal and introduction are discussed, and comparisons are made with the introduction of other Helicidae species.
Sun, 27 Mar 2014 16:00:00 +0100Adult shells and living specimens of the terrestrial gastropod Oxychilus camelinus were collected on Rahat Tepe Hill in Plovdiv city, and in Stara Zagora. These records confirm the findings of Hesse (1913) of the occurrence of this species in Bulgaria.
Thu, 24 Mar 2014 22:30:00 +0100The recent mollusc assemblages of the Vltava River, the longest river in the Czech Republic (430 km), and its valley were studied (South and Central Bohemia). Altogether, 162 species of terrestrial and freshwater molluscs representing 65% of the total Czech malacofauna, were recorded at 532 sites studied between 1940 and 2013. Considering high species richness and diversity of mollusc fauna, the Vltava River valley ranks among the malacologically richest areas in the Czech Republic despite (1) the strong migration barrier of the nine dams on the upper and middle river stretches, (2) the long-term human influence in a whole river valley during the Holocene and, (3) the intensive agriculture in the lower part of the river floodplain. The river phenomenon, partly developed in the upper river stretch and fully developed in the middle part of the river, is the leading cause of such remarkable species richness.
Mon, 24 Mar 2014 22:30:00 +0100The invasive pest slug Arion lusitanicus (also known as Arion vulgaris) has spread throughout much of Europe within the last 60 years, becoming one of the worst agricultural and horticultural pest species. It has now been detected in Romania for the first time. There are dense populations at two sites in Braşov County (2013) and another occurrence in Mureş County (2012). We review occurrences in neighbouring countries and discuss evidence that A. lusitanicus might have arrived in Romania earlier. Further research on the species’ spread in Romania and on its impact on the native fauna and flora is necessary.
Wed, 18 Feb 2014 21:00:00 +0100Until 2013, no published records of the Desmoulin's whorl snail (Vertigo moulinsiana) were known from the Danube lowland in the Slovak Republic. In this paper we present the first record of the Desmoulin's whorl snail in this area, and report the site conditions and the structure of accompanying land snail community. The site was examined by visual searching, including a 6-litre sample of plant litter collected and subsequently analysed. A numerous viable population of the species was recorded only by visual searching, whereas the litter sample did not yield any shells of the Desmoulin's whorl snail.
Sun, 8 Dec 2013 23:00:00 +0100Snail Cepaea vindobonensis (C. Pfeiffer, 1828) was recorded at two isolated localities in Marienbad and close to the village of Štítary in the foothills of the Český les Mts. (West Bohemia). While only a single specimen was recorded along a blind railway line near the railway station in Marienbad, the locality by Štítary hosts a rich viable population in rocky steppe vegetation with shrubs at a xeric south-facing steep slope. Further searches in Marienbad were not positive in 2012 and 2013. However, future research is needed to understand if the species occurrence was only accidental or if a stable population lives there. The site Marienbad represents the westernmost record throughout the entire species distribution area and also the location at the highest altitude in the Czech Republic.
Wed, 4 Dec 2013 23:45:00 +0100The habitat diversity of the Kopičácký rybník National Nature Monument (Central Bohemia, Czech Republic) contains a pond with littoral vegetation and nearby fens, and surrounding Molinia meadows. The first malacological records originate from a short visit in 2004 when an abundant population of Vertigo angustior was found there. A detailed research during 2005–2012 resulted in the discovery of Anisus vorticulus, a critically endangered freshwater snail species. This local small population is even more worthy of a specific protection management as the site seems to be one of the last refugees of this species in the Czech Elbe Basin.
Sun, 1 Dec 2013 18:30:00 +0100This paper summarizes the knowledge of freshwater mollusc fauna of the Most Lake. It was created in 2008–2013 by flooding of the majority of the former coal quarry of Ležáky (Northern Bohemia). This water reservoir originated in the area of 311 ha and with the maximum depth of 75 m it is the largest water body of the area. The research was conducted in summer 2013, when the water level was about 0.5 m bellow the final expected level. In total, only six species of freshwater molluscs (five gastropods, one bivalve) were found at 11 sites. Two autochtonous molluscs (Radix auricularia and Gyraulus crista) and four allochtonous species (Physella acuta, Gyraulus parvus, Menetus dilatatus and Dreissena polymorpha) were found. The occurrence of all species except D. polymorpha was scattered, while the latter occurred in numerous populations sometimes with more than 80 specimens per 10 cm2. Most of the molluscs were found on stones of the lake banks or at areas of shallow water. The results obtained during this research have recorded mollusc assemblages at the first successional stages of this artificial lake, thus enabling future comparison.
Thu, 21 Nov 2013 20:00:00 +0100This contribution introduces a professional and human profile of the leading Slovak malacologist Jozef Šteffek, which has sadly passed away in April 2013. A bibliography of his abundant work (yrs 1976–2013) is also included.
Wed, 10 Jul 2013 20:00:00 +0100Records of terrestrial molluscs collected in nine scattered sites in southeastern Ukraine are presented and discussed. The findings of non-native Helix lucorum and Lucilla singleyana are especially interesting. Coloration of H. lucorum in different parts of its range seems to be significantly different. A role of keel in species determination of collected Helicopsis sp. shells is discussed. Variability of Deroceras subagreste coloration is described. New data on a species composition of terrestrial molluscs in several protected areas is given.
Tue, 9 Jul 2013 23:30:00 +0100One shell of Insignia macrostoma Angelov, 1972 without an operculum was found on 10 Dec 2011 in cave river deposits of the Toplya cave, Bulgaria, Stara Planina Mts., near the village of Golyama Zhelyazna. It is the second finding of this species after more than 40 years and a new locality.
Wed, 5 Jun 2013 18:15:00 +0100This paper presents a research of floodplain mollusc communities of the Jizera River (the Elbe tributary, North Bohemia, Czech Republic). Altogether, 101 mollusc species (100 species of gastropods, one species of bivalve) were recorded at 55 selected sites during previous and recent researches in 1945–1997 and 2002–2009, representing 40% of the total Czech malacofauna. The upper well-preserved stretch of the river hosts a rich forest mollusc fauna with some rare woodland species e.g. Arion intermedius, Cochlodina dubiosa corcontica, Daudebardia brevipes, D. rufa, Vertigo alpestris and Vitrea subrimata. Impoverish assemblages of the lower stretch are represented by some common or open/semi-open country species, because the river flows there through the landscape of an intensive agricultural land use and high settlement density. Despite, the occurrence of 31 rare species (four of them endangered, eight vulnerable, and 19 near threatened) was recorded at the upper stretch of the Jizera River alluvium, which provides an important refuge for these mollusc faunas.
Wed, 3 Apr 2013 14:00:00 +0100This paper presents a research of the floodplain mollusc communities of the Ploučnice River (Elbe tributary, North Bohemia, Czech Republic). Altogether, 66 mollusc species (65 species of gastropods, one species of bivalve) were recorded in the 35 floodplain forest sites during the research between 2007 and 2011, representing 27% of the total Czech malacofauna. More than a half of all species represents the common forest species (52% of all recorded species) with some rare woodland species as Aegopinella nitidula, Daudebardia rufa, Macrogastra ventricosa, Oxychilus depressus, O. glaber and two endangered species Clausilia bidentata and Daudebardia brevipes. Rare wetland species protected by the NATURA system Vertigo angustior and vulnerable V. antivertigo were also found. The occurrence of these rare species (two of them endangered, three vulnerable, and 11 near threatened) makes the Ploučnice river alluvium as an important mollusc refugium of prime conservation importance in this fragmented Czech landscape of long-term agricultural land use.
Fri, 15 Mar 2013 13:15:00 +0100This paper presents a research of floodplain mollusc assemblages of the Úštěcký Brook catchment basin (Elbe tributary, North Bohemia, Czech Republic). Altogether, 71 mollusc species (69 species of Gastropoda, 2 species of Bivalvia) were recorded in the study sites between 2007 and 2011, representing 29% of the total Czech malacofauna. The common forest species dominated (41% of all recorded species) and included some rare woodland species as Daudebardia rufa, Discus perspectivus, Macrogastra ventricosa, and Sphyradium doliolum. Rare wetland species protected by the NATURA system Vertigo angustior and endangered wetland species Vallonia enniensis were also found. The richest assemblages occurred on the upper part of the brook, while the lower part was very species poor due to agriculture land use in this fertile floodplain. A small calcareous moorland, situated in the northeastern vicinity of Úštěk Town (north Bohemia) includes a Holocene mollusc succession that was subdivided into three local mollusc zones: I – basal zone with marked numbers of Discus ruderatus, Vertigo geyeri and numerous aquatic taxa, II – with forest species including Platyla polita and III – dominated by open-ground and catholic species. Despite the specific conditions of the moorland habitat the succession largely corresponds with the standard developmental pattern of the mollusc fauna in the zone of mid-European uplands. Of particular interest is the developmental break reflected by the poor fauna in the layer 3. The malacofauna of the Úštěcký Brook can be used as a model of alluvial mollusc assemblages of the brook floodplain that is situated in the warm area of Central Europe with long-term history of agriculture land use.
Tue, 12 Feb 2013 00:30:00 +0100The Mazák National Natural Reserve provides suitable habitat conditions for many rare and endangered animals which are limited to low-disturbed or near-natural ecosystems. The malacofauna of the Mazák NNR was studied in 2012. Altogether, 37 species (35 land and 2 freshwater snails) were recorded. Two endangered species are interesting from ecological and faunal point of view: Vitrea transsylvanica and Eucobresia nivalis.
Fri, 1 Feb 2013 14:45:00 +0100The malacological research in the Šibeničník Natural Reserve (South Moravia, Czech Republic) revealed the occurrence of 17 land-snail species. For one of them – Truncatellina costulata (Nilsson, 1822) – it is only the third known locality in the Czech Republic.
Thu, 17 Jan 2013 23:30:00 +0100The Bachureň Mts. are the least known orographic unit of Slovakia from the malacological point of view, therefore it was important to fill this gap in the faunistic research of malacofauna in Slovakia. In order to achieve the maximum mollusc diversity of the Bachureň Mts., various habitat types were the subject of interest. Field work was conducted in the years 2009–2011 at 78 sites. Altogether 108 mollusc species were recorded. In total, nearly 20 000 specimens were collected and identified. Half of all recorded species were representatives of woodland species s. l. From zoogeographical point of view, species with cosmopolitan, Euro-Siberian and Central European distribution made up the highest proportion. Carpathian species were numerous as well. Across the whole mountain, West Carpathian species (Petasina unidentata, Plicuteria lubomirskii and Trochulus villosulus) encountered the species with centre in eastern part of the Carpathians (Perforatella dibothrion, Pseudalinda stabilis, Oxychilus orientalis and Vestia gulo). On the basis of spatial distribution of sensitive species indicating undisturbance of habitats, the most valuable biotopes showed to be springs, wetlands and riparian vegetation along the upper parts of the streams with Acicula parcelineata, Bulgarica cana, Macrogastra latestriata, Vertigo angustior, V. antivertigo, V. substriata, and Cochlicopa nitens. Valuable biotopes were dolomite rocks with the occurrence of relict steppe with Pupilla triplicata and well-preserved scree woodlands with V. substriata and B. cana as well.
Tue, 18 Dec 2012 16:30:00 +0100The Soos National Nature Reserve nearby Františkovy Lázně Town (Western Bohemia, Czech Republic) is a spectacular peatbog site with the occurrence of fens on numerous mineral spring effluents, emanations of pure carbon dioxide in mofettes (i.e. false mud volcanoes), parts with saltwater wetlands, and diatomite mantel in its central part. These natural conditions affect general character of all habitats, vegetation and malacocoenoses in the reserve. Altogether, 31 mollusc species were found there, but only two of them are considered as near threatened (Pisidium obtusale and Vertigo substriata). The majority of recorded assemblage was composed of common and generalist mollusc species.
Sun, 14 Dec 2012 11:30:00 +0100This paper presents results of a malacological survey of four small tributaries of the brook Javorka near Lázně Bělohrad in East Bohemia (Czech Republic). Only 15 species of aquatic molluscs (7 gastropods, 8 bivalves) were found at 31 sites during research realised in 2010, 2011 and 2012. Molluscan assemblages of all tributaries were similar and consisted of common and widespread molluscs as Galba truncatula, Radix peregra, Anodonta anatina, Pisidium subtruncatum or P. casertanum. The occurrence of endangered river pea mussel (Pisidium amnicum) was confirmed at three tributaries but only at lower parts near its inflows to the brook Javorka. The research was focused on the endangered thick-shelled river mussel (Unio crassus), and the occurrence of numerous population was confirmed at the brook Lukavecký potok. In the brook Chotečský potok a small population of this bivalve was found. Only a few specimens were found at remaining two tributaries.
Sun, 7 Oct 2012 23:00:00 +0100Here we present a biostratigraphy of entrance deposits in the Veľká Drienčanská Cave based on molluscan and vertebrate successions in correlation with prehistoric pottery records. This corresponds to the final Last Glacial – Holocene time-span and reflects the following environmental history: the coexistence of open-country and woodland snail communities throughout the whole succession documents the persistence of high-diversity karsts parkland since the Late Glacial up to present, which has been supported by human activities since the Neolithic occupation. However, the molluscan succession shows a general agreement with the standard mid-European developmental pattern. The molluscan evidence is confirmed by vertebrate fossil finds.
Wed, 3 Oct 2012 17:00:00 +0100The paper brings a review of a long-term malacological survey of fragmented urban alluvial woodland, an important refuge of Middle-Danubian terrestrial molluscan fauna. In the area of Bratislava agglomeration we surveyed two softwood and 26 hardwood alluvial forests. Altogether, 52 mollusc species have been recorded during the last 20 years (representing 79% of the total terrestrial mollusc fauna living in the Slovak section of the Danube floodplain). The most frequent species (more than 75% sites) were Aegopinella nitens, Helix pomatia, Monachoides incarnatus (every three species at 27 sites, i.e. 96%), Cochlodina laminata (26 sites, 93%), Petasina unidentata (25 sites), Urticicola umbrosus (24 sites), Alinda biplicata (23 sites), and Clausilia pumila (21 sites). The main ecological groups were forest species in general (45%, mainly eurytopic and slightly hygrophilous), hygrophilous species in general (26%, hygrophilous and riparian), euryecious species (16%), semi-steppe (8%) and open-country species (5%).
Mon, 16 Apr 2012 24:15:00 +0100The recent research has shown a high malacological value of the Skalní Potok Nature Reserve that had never been searched for molluscs. The reserve hosts 49 mollusc species, which represents almost 20% of the entire Czech malacofauna. Such richness can be explained mainly by a high habitat diversity of the target area. Several types of forest such as ravine forests, alder carrs, herb-rich beech forests and spruce forests alternate on the area of 2 km2. Among endangered species, the most interesting findings represent sensitive species from the family Clausiliidae, chiefly Bulgarica cana, Clausilia cruciata, and Ruthenica filograna. This area deserves the strictest protection as the reserve belongs to one of the well-preserved remnants of deciduous leaf forests in the Hrubý Jeseník Mts.
Wed, 29 Feb 2012 22:30:00 +0100This paper presents results of a malacological survey of the Lužnice River in ca 70 km long stretch between the inflow of its main tributary the Nežárka River in Veselí nad Lužnicí and its confluence with the Vltava River in Southern Bohemia (Czech Republic). Thirty-one species of aquatic molluscs (19 gastropods, 12 bivalves) representing 40% of freshwater molluscan fauna of the Czech Republic were found at 15 sites. Differences of molluscan assemblages upstream and downstream of Tábor town were probably caused by different characters of the watercourse. The occurrence of rare bivalve Pseudanodonta complanata was confirmed. On the other hand, two non-native species Physella acuta and Sinanodonta woodiana were recorded. The research was preferentially focused on the population of the endangered bivalve Unio crassus. Its occurrence was confirmed at 8 from 15 sites under study but altogether only 31 individuals were found. Less than four specimens were found at particular sites but one.
Fri, 20 Jan 2012 02:30:00 +0100A total of 56 species of land snails and 9 freshwater species were recorded at 22 alluvial forest sites (14 alder sites, 8 beech or hornbeam sites) in the Small Carpathian Mts. (SW Slovakia) during the researches in 2008–2009. Fifty two species were recorded in alder carrs and 32 species in adjacent forests. Woodland species sensu stricto (17 species, 32.7%) and euryecious species (10 species, 19.2%) predominated in alder forests. Dominant ecological groups in beech and hornbeam forests were woodland species sensu stricto (14 species, 43.8%) and woodland eurytopic species (6 species, 18.8%). There were 28 species (433 individuals) at the highest species richness site (Lozorno, alder carr). Generally, the species richness was higher in alder forests in comparison to beech or hornbeam forests. As expected, there was a higher number of species at the carbonate sites than non-carbonate sites. The following species were recorded in the Small Carpathian Mts. for the first time: Deroceras rodnae s. lat. Grossu et Lupu, 1965, Deroceras turcicum (Simroth, 1894) and freshwater snail Gyraulus rossmaessleri (Auerswald, 1852).
Wed, 21 Dec 2011 20:30:00 +0100A survey of the gastropod mollusc fauna in the coastal waters of the southern part of the Curonian Lagoon (Kaliningrad region, Russia) were carried out. Study revealed 34 aquatic gastropods representing 30% of Prosobranchia and 70% of Pulmonata. Obtained data showed higher mollusc diversity in the littoral biotopes in comparison with open areas of the Lagoon. The fauna is represented by a typical Central European species complex of freshwater gastropods. The reed zone along the coastline in the Lagoon functions as a barrier and provides shallow water habitats with slow moving and warmer water, where maximum gastropod species concentrate.
Wed, 23 Nov 2011 22:00:00 +0100Sampling of flood debris deposits can be useful method in insufficiently surveyed areas. This sampling method also allows us to detect the presence of rare and endangered species in the study area. We studied flood debris along the Neresnica River to gather data on mollusc fauna of the Pliešovská Kotlina basin and the Javorie Mts. (Central Slovakia). In spring 2010, samples of flood debris were taken at three sites along the river. Molluscan thanatocoenoses were composed of 68 species (56 terrestrial and 12 aquatic ones). The most notable records were two subterranean species – Lucilla scintilla and L. singleyana, and also the species of nature conservation interest – Vertigo angustior. We found representatives of all ecological groups of molluscs, which provide the evidence of ecosystem diversity in various habitats along the river. We documented that the land use of the studied drainage basin was only partially reflected by the structure of mollusc assemblages from flood deposits.
Fri, 11 Nov 2011 15:40:00 +0100The Loucké Rybníky ponds State Nature Reserve was established in 1954 and due to negative effects of mining activities it was abolished in 1979. This article presents results of malacological survey in the Loucké Rybníky ponds (Karviná-Louky, Czech Republic) conducted in 2006 and 2007. The samples were collected at seven locations which match with sites sampled in 1954 and 1978; the location of sites were detected based on original schematic maps showing their position. The research was focused on aquatic species, terrestrial mollusc were collected only marginally. In 2006 and 2007, 38 mollusc species were found (35 gastropods and 3 bivalves), which include 17 species of aquatic molluscs and 21 terrestrial. Based on comparison with the data collected in 1954 and 1978 we conclude that the total destruction of aquatic habitats was irreversible and lead to changes in the species composition. Several rare and endangered species have extinct at this site and the total species richness of aquatic species decided from 29 to 17.
Tue, 1 Nov 2011 23:30:00 +0100Hončova Hůrka hill in Skotnice near Příbor is important mineralogical locality. It is formed by rocks of the teschenite association. It was opened as relatively small picrite quarry with further enlargement due to gravel mining up to present status. Quarries in general possess wide range of habitats. Moreover, teschenite rock association with its high calcium content is favourable environment for land snails. Altogether, 27 land snail species were found in Hončova Hůrka hill, of which four are concerned as near threatened (Ena montana, Vertigo pygmaea, Daudebardia rufa and Pupilla muscorum). This site thus has a potential as local refugium for endangered species and deserves our attention.
Tue, 18 Oct 2011 12:00:00 +0100The recent molluscan assemblages of all floodplain forests on the 256 km long Ohře River were studied (West and Northwest Bohemia, Czech Republic). Altogether, 75 species of terrestrial Gastropoda representing 30% of the total Czech malacofauna, were recorded at sites selected during previous and recent research from 1950−2010. The Ohře malacofauna is impoverished of many forest and floodplain species in comparison to molluscan assemblages of smaller Bohemian rivers to the west and northwest. The richest molluscan assemblages occur on the upper part of the river, while the middle and lower parts are very poor. Low alpha-diversity of these parts of the Ohře River can be explained by (1) intensive agriculture in floodplain areas of the middle part of the river, (2) the migration barrier of the Nechranice Dam between the upper and middle river parts, and (3) long-term human influence on the lower part of the Ohře River during the Holocene.
Wed, 10 Aug 2011 23:45:00 +0100The paper reports faunistic data on the land snail fauna of the protected beech forest reserve of Fagetul Secular Humosu (Suceava County, Romania). We found several species with Carpathian distribution, and the study area is probably the easternmost locality of these species. The Humosu Forest Reserve is the fourth locality of Serrulina serrulata (L. Pfeiffer, 1847) in Romania. The species survival requires occurrence of preserved old-growth forests with decaying tree trunks and logs.