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... Spodní jižní partie jsou částečně doplňovány také říčními a sprašovými kvartérními sedimenty (MÜLLER & VOPRŠÁLKOVÁ 1993, BUREŠ & BUREŠOVÁ 1997. Zdejší opuky obsahují 10-30 % CaCO 3 a představují silně vápnité podloží (LOŽEK 1960). Pozorování pedologických poměrů ukázala, že půdy v plochých úsecích opukové oblasti podléhají poměrně rychlému vyluhování a jsou zcela odvápněné. ...
... Pozorování pedologických poměrů ukázala, že půdy v plochých úsecích opukové oblasti podléhají poměrně rychlému vyluhování a jsou zcela odvápněné. Naproti tomu, tam kde vychází čerstvá hornina na povrch, zejména ve strmých údolních srázech, jsou po-měry zcela odlišné, neboť zde již nemůže docházet k tak intenzivnímu odvápnění jako na plochých partiích (LOŽEK 1960). Nalezneme zde tedy biotopy s půdami skeletovými a vápnitými vedle biotopů s půdami jílovitými a kyselými. ...
Altogether, 78 mollusc species were recorded in the Hemže-Mýtkov Nature Reserve (East Bohemia, Czech Republic) during 2005–06. This locality harbours 32% of the total mollusc fauna of the Czech Republic at only 29 ha. This fairly high species richness corresponds to a high habitat diversity and species pool of the region that consists of a mixture of Alpine and Carpathian elements. Of prime conservation importance is a high share of rare and endangered species and species mostly having an isolated population there from the main distribution range. These species are East-Alpine Aegopis verticillus, Cochlodina commutata and Itala ornata, and the East-Alpine-Carpathian Bythinella austriaca. Carpathian species represents Faustina faustina. Except mentioned species there are several other rare and sensitive species such as Daudebardia brevipes, Perpolita petronella, Platyla polita, Pupilla sterri, Vertigo alpestris, and Vertigo antivertigo. Although, forest species prevailed, there were also representatives of other ecological groups such as synanthropic, steppe, water, and wetland species.
Altogether, 40 mollusc species were recorded during the research of five localities in the Tichá Orlice River valley (East Bohemia, Czech Republic). The high species richness is in accordance with high habitat diversity of the studied area. One new species (Oxychilus glaber) was recorded for the first time in the Tichá Orlice River valley.
Molluscan communities were studied at 123 castles in the Czech Republic. Altogether 70 % of the land snails of the Czech Republic were found at these sites. A complete literature review on castle-related molluscan fauna was performed for the Czech Republic. Castes represent significant refuges for many species, as indicated by the high species diversity and the presence of rare (21 % of Red List species) and geographically isolated species (26 % of all species). Castles present a characteristic set of island habitats markedly differing from the surrounding landscape. Castes can be considered as man-made ecological phenomena.
Molluscan communities were studied at 123 castles in the Czech Republic. Altogether 70 % of the land snails of the Czech Republic were found at these sites. A complete literature review on castle-related molluscan fauna was performed for the Czech Republic. Castes represent significant refuges for many species, as indicated by the high species diversity and the presence of rare (21 % of Red List species) and geographically isolated species (26 % of all species). Castles present a characteristic set of island habitats markedly differing from the surrounding landscape. Castes can be considered as man-made ecological phenomena.
Altogether, 78 terrestrial mollusc species were recorded on 31 plots in a stretch of the Tichá Orlice River valley between the cities Choceň and Letohrad (East Bohemia, Czech Republic) in 2007 and 2009. This region harbours 46% of the total terrestrial mollusc fauna of the Czech Republic. The fairly high species richness corresponds to a high habitat diversity and species pool of the region that includes Alpine and Carpathian elements. Of prime conservation importance is a high share of rare and endangered species (EN-2, VU-9, NT-14 species) and species mostly having an isolated population there from the main distribution range. This region is a real hotspot of forest gastropods in Transalpine Europe.
The aim of this study was to assess the role of river floodplains as biocorridors for terrestrial snail dispersal. We hypothesised that assemblages in the river alluvium should be more homogeneous in species composition than those in the forest slopes above the river. We also studied the effect of rivers as barriers on the assemblage composition of snail species inhabiting slopes of riverine valleys. The study was conducted on 33 woodland plots arranged in three parallel transects in the Tichá Orlice river valley (E Bohemia, Czech Republic). One transect was in an altered river floodplain and the remaining two on the slopes of the river valley. As expected, the median value of the Jaccard similarity coefficient was highest in the floodplain (50%), although significant difference was obtained in comparison with assemblages of only one slope transect. Further analysis showed that snail assemblages were mostly affected by environmental factors such as humidity and soil calcium content; connectivity played rather minor role.
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