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The signal crayfish, Pacifastacus leniusculus (Dana, 1852), was recorded in the Slovak-Austrian stretch of the Morava (March) River in the Záhorie region in August 2006. This is the first confirmed record of a non-indigenous crayfish species of American origin in Slovakia. Most likely, signal crayfish were intentionally released to the river by Austrian fishermen, or invaded from adjacent water bodies...
The gall midge Obolodiplosis robiniae is a pest of black locust Robinia pseudoacacia. The species was recently introduced into Europe and it is nowadays a usual insect in Slovakia, where two-year field surveys were undertaken during 2007–2008. The main objective of this study was to determine the natural enemies attacking O. robiniae and estimate their influence on midge population, less than 3 years...
Regeneration of Slender speedwell (Veronica filiformis) from small parts of stem without using stimulative agents was the focus of the investigation. Four different short fragments of shoot (main terminal, secondary terminal, nodal segment and internodal segment) were cultivated under greenhouse and natural conditions. All tested vegetative segments induced roots, rooted in a soil substrate and in...
In the Czech part of the Labe River and the lower part of the Vltava River, we examined if the benthic macroinvertebrate composition changed from 1996 to 2005 due to expected improvements in water quality resulting from socioeconomic changes in the Czech Republic since the 1990s. Special attention was given to rare and alien species. The four biological metrics used (Number of taxa, BMWP, Number of...
It is well accepted that climate change will have a significant effect on aquatic environments and together with temperature as one of the most important variables, it will represent a major driver of shift in the ecosystem. The increasing temperature in waters of temperate zones will have stressful effect on coldwater adapted fish species that may lead to the shrink of their area of occurrence or...
The present study analyzed the distribution routes of the invasive Chinese sleeper (Perccottus glenii Dybowski, 1877) and its parasites, focusing on the Carpathian region of Europe. The invasive Chinese sleeper was sampled using beach seines from two rivers in Ukraine, then assessed for parasites. Published data about its parasites in Central and Eastern Europe were analysed and compared to these...
Successful invasive species compete for the same available resources with related native species, frequently driving the latter to the cusp of extirpation because of a lack of adaptive response. In this paper we analysed the behavioural relationships between two species of crayfish, the native Astacus leptodactylus and the invasive Orconectes limosus in an ongoing invasion process in the Lower Danube,...
The freshwater bryozoan Pectinatella magnifica (Leidy, 1851) is an invasive species in many countries all over the world. Although native to North America, it has been found in many countries of Europe and Asia. Pectinatella magnifica forms the largest colonial masses from all recently known bryozoan species. Culturing this organism in an aquarium has never been achieved for more than few days so...
India, a megadiverse tropical country is grappling with the issue of biological invasions. As a signatory to the Convention on Biological Diversity, India is committed for managing its major biological invasions by 2020. Lack of prioritization of invasive species for control and management is the biggest hurdle for achieving this commitment. We reviewed 21 High Concern Invasive Species (HiCIS) across...
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