Beckmannia Eruciformis (L.) Host in Slovakia - Distribution, Ecology and Coenotic Affinity: Dedicated to the memory of Ján Bogoly (1951 - 2011)
The historical and recent distribution, ecology and phytosociology of perennial grass Beckmannia eruciformis was studied in Slovakia between 2002 and 2010. Altogether 22 natural and two secondary sites with presence of the species were found from published sources, herbaria and field research. Localities of its native occurrence have been concentrated in Eastern Slovakia (Východoslovenská nížina Lowland from the settlement of Streda nad Bodrogom to the villages of Pribeník and Biel). Secondary sites were found in Western Slovakia (Podunajská nížina Lowland; the surroundings of Sládkovičovo town and Jaslovské Bohunice village). The relatively massive reduction of Beckmannia eruciformis localities was recorded in the seventies and eighties of the last century; it was related to massive land reclamation and alterations in the water regime of river alluvia. Recently only seven localities were found. Permanent occurrence was confirmed only in two localities (Malý Horeš, Strážne). In those cases Beckmannia eruciformis has created relatively large populations including some thousands of individuals. All other recent occurrences were temporary (Streda nad Bodrogom, Keresztúr farmstead, Horešské lúky Nature Reserve, Veľký Horeš, Pribeník). Moreover, they were relatively poor in the number in individuals and are acutely threatened by anthropogenic changes of environmental conditions. According to our results and by applying the IUCN criteria, we propose to modify the threat category of the species from critically endangered (CR) to endangered (EN) in Slovakia. Occurrence of the association Beckmannietum eruciformis and the alliance Beckmannion eruciformis, was also not confirmed for Slovakia during our research. We believe that the association was not present in the past either. Recently, Beckmannia eruciformis was found in the stands of Oenanthion aquaticae (Phragmito-Magnocaricetea) and Potentillion anserinae (Molinio-Arrhenatheretea) in two localities (Malý Horeš, Strážne) during our study. The species composition of the mentioned alliances is fundamentally influenced by the ecological conditions of sites, mainly by water regime during the vegetation period. According to our knowledge, the most favourable conditions for Beckmannia eruciformis are the following: short-term and low floods in the spring, decrease of the water table at the beginning of summer and relatively high level of groundwater during next part of vegetation period. On the contrary, the species may not appear on the site in case of unfavourable weather conditions (dry years).
Historical and current occurrence of halophytic species Carex divisa was studied in Slovakia during 2003–2014. It is known only in the Podunajská nížina Lowland, SW Slovakia, where 19 sites were found in total including historical and recent locations. Recently, the number of records decreased markedly and we confirmed only 9 localities. Due to the sharp reduction in the number of sites and appropriate habitats, Carex divisa is re-evaluated as endangered (EN) plant species of the Slovak flora.
Historical and current occurrence of obligate halophyte Artemisia santonicum subsp. patens was studied in Slovakia during 2001-2012. The species has been occurred in the Podunajska nižina Lowland and the Vychodoslovenska nižina Lowland; 35 localities were found in total. The data from the Zahorska nižina Lowland is erroneous. Recently the number of localities decreased markedly and the species was confirmed only in 17 sites. Most of them (16) is situated in the Podunajska nižina Lowland and a single one has been confirmed in the Vychodoslovenska nižina Lowland. Based on our data, Artemisia santonicum subsp. patens belongs to the endangered (EN A2ac+4c) plants of the Slovak flora according to IUCN categories and criteria, because 50 % of locations were destroyed and survival prognosis is unfavorable for the most recent populations.
Two new and one historical site of Cyperus glomeratus were discovered in SW Slovakia along the left bank of the river Danube. After 60 years, this is the second record of the species in the country. We provide details about the historical and current distribution of C. glomeratus in Slovakia based on herbarium revision and field survey on the Slovak section of the river Danube. According to the phytosociological data collected from the new locality (Čenkov) and from the confirmed historic locality (Štúrovo), the stands with C. glomeratus were identified with less developed, ruderalized form of the association Cyperetum micheliani.