An integrated system of evaluation of genotoxic damage was employed in two rodent species (Clethrionomys glareolus, Apodemus flavicollis) collected in a polluted and a control site in northern Bohemia. Elevated concentrations of heavy metals (Cd, Mn, Pb, Cu, Zn) were found in soil samples from the polluted site. Significantly higher concentrations of certain non-essential heavy metals were observed in kidney and liver of the animals studied in the polluted site, however, temporal variation between years and seasons was significant. Heavy metals originating from industrial aerial pollution may be not distinctly reflected in tissue concentrations recorded in small terrestrial rodents, in contrast to soil pollution resulting from mine works and/or from road traffic. In the same animal samples, micronucleus test and sperm abnormalities assays were used to study the correlation between environmental pollution and genetic damage. Higher genotoxic damage was demonstrated in the animals collected in the polluted site. Micronuclei frequencies appeared to be more suitable markers of mutagenicity than those of abnormal sperms. A. flavicollis seems to be a more suitable model in studies of environmental genotoxicity than C. glareolus.
Článek si klade za cíl zkoumat rychlost dopravy v době železné a pokusit se využít získané poznatky při poznávání organizace dopravy a obchodu, při interpretaci sídelních struktur i při obecném pohledu na vývoj starých společností. V textu je nejprve předložen výběr údajů z písemných pramenů od antiky po raný novověk týkajících se rychlosti dopravy. Tento výběr ukázal, že se dosahované rychlosti po celé toto období (až do zavedení železnice) nijak výrazně neměnily, proto lze pro modelování určitých situací v pravěké dopravě údaje z písemných zpráv, a to nejen antických, s opatrností využívat. Následně se autor věnuje hlavním faktorům, které (nejen) v pravěku ovlivňovaly rychlost dopravy. V závěrečných pasážích autor využívá dosažené údaje při rekonstrukci dovozu soli do Čech a hodnocení organizace osídlení Čech v době laténské. Vyjadřuje se rovněž k problematice geografického a sociálního prostoru. and The aim of the article was to study the speed of transport in the Iron Age and to attempt to use the acquired information to learn about the organisation of transport and trade, during interpretations of settlement structures, and while using a general view of the development of early societies. The text first presents a selection of information on the subject of the speed of transport from written sources dating from Antiquity through to the Early Modern period. This selection showed that transport speed throughout this entire period (up until the advent of the railway) did not change significantly, and it is therefore possible to use information from written sources (and not only antique) to model certain situations in prehistoric transport. The author then addresses the main factors that influenced the speed of transport in prehistoric times and in the subsequent period. In the closing passages the author uses the obtained information to reconstruct the transport of salt to Bohemia and for an evaluation of the organisation of settlement in Bohemia in the La Tène period. The author also deals with the issue of geographic and social space.
Various disturbances in forests often result in the formation of open habitats with characteristics that are distinctly different from those of the original forest (microclimate, illumination, stand age and composition). These disturbances affect the habitat heterogeneity in time and space and seem to drive forest succession and changes in biodiversity in forests. Little is known about how the colonization of deforested habitats by Orthoptera is influenced by environmental factors. We studied the association between the structure of orthopteran assemblages and the age of clear-cuts, vegetation structure and other environmental parameters (size, elevation, altitude). This involved 33 clear-cuts of three age categories in broadleaved forests dominated by European beech. The Orthoptera were sampled using sweep netting and by counting individuals recorded along transects that ran parallel to those used for recording the structure of the vegetation. We recorded significant differences in the number and abundance of species in the three age categories of clear-cuts. Grasshopper species were more abundant than bush-crickets in first year clear-cuts. Species capable of flight occured in all three age categories of clear-cuts (>62% of the 27 species recorded). All the species of Orthoptera identified were present in two year-old clear-cuts. The species composition and abundance of Ensifera and Caelifera differed in their association with the six vegetation parameters studied. While the Caelifera occurred in habitats with bare ground the Ensifera mainly occurred in those with a higher proportion of shrubs and trees. There was also a positive correlation between number of species of Orthoptera and area of the clear-cut regardless of its age as well between the number of species of Orthoptera and elevation., Anna Sliacka, Anton Krištín, Ladislav Naďo., and Obsahuje seznam literatury