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Land snail shell degradation in forest environment
Říhová, Dagmar ; Horsák, Michal (referee) ; Juřičková, Lucie (advisor)
Experimental shell degradation of nine common Central European pulmonate snail species in forest ecosystems in the Czech Republic was investigated. Model shells were deposited for 6, 12, 24 and 36 months in leaf litter of six different places; than removed, dried and photographed. Set of alternations was analysed by CANOCO 4.5 statistical system. Small species degrade different from large ones. Large species corrode outwards, after periostracum disruption the ostracum dissolves and holes appear. Small species corrode out from within, calcium carbonate dissolves and small windows arise. The shell degradation proceeds with different rate on various localities. Some localities have characteristic types of alteration, e.g. peat bog pine forest exhibits ostracum dissolution and periostracum deformation. The ultimate influence of the degradation is caused by pH value and humidity. Shell shape and size have effect on its degradation. Moreover, other important decomposition agents are living animals. Powered by TCPDF (www.tcpdf.org)
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Společenstva měkkýšů podél dálnic ve vazbě na proměnné prostředí
Juřičková, L. ; Kučera, Tomáš
Motorways are one of the widespread and frequently discussed landscape features, especially in Central Europe. We established three transects along the three main motorways in southeastern, southwestern, and northern directions from Prague (D1, D5, R10). These transects covered major environmental gradients of geographical position, altitude, succession, and vegetation cover. Altogether 44 land snail species (more than 26 % of the Czech Republic’s land snail fauna) were found at the 45 sites on the verges along 225 km of motorways. Surprisingly 21 % of species were such included in the Red List of the Czech Republic’s molluscs, and the endangered species Daudebardia brevipes was even present by a very abundant population. We expected the motorways to be of importance as man-made linear structure for the spreading of invasive and synathropic species, but only one such species has been found - Monacha cartusiana.
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Společenstva měkkýšů podél dálnic a jejich vztah k prostředí
Juřičková, L. ; Kučera, Tomáš
Motorways are one of the widespread and frequently discussed landscape features, especially in Central Europe. We established three transects along the three main motorways in southeastern, southwestern, and northern directions from Prague (D1, D5, R10). These transects covered major environmental gradients of geographical position, altitude, succession, and vegetation cover. Altogether 44 land snail species (more than 26 % of the Czech Republic’s land snail fauna) were found at the 45 sites on the verges along 225 km of motorways. Surprisingly 21 % of species were such included in the Red List of the Czech Republic’s molluscs, and the endangered species Daudebardia brevipes was even present by a very abundant population. We expected the motorways to be of importance as man-made linear structure for the spreading of invasive and synathropic species, but only one such species has been found - Monacha cartusiana.
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