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ACTA BOTANICA New Findings of the Common Ragweed (Ambrosia Artemisiifolia) in Slovakia in the Year 2017 HRABOVSKÝ, M., MIČIETA, K

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ACTA BOTANICA New Findings of the Common Ragweed (Ambrosia Artemisiifolia) in Slovakia in the Year 2017 HRABOVSKÝ, M., MIČIETA, K Contents Ruderal plant communities from the class Stellarietea mediae R. Tx. et al. ex von Rochow 1951 in Bratislava City RENDEKOVÁ, A., MIČIETA, K. 3 ACTA BOTANICA New findings of the common ragweed (Ambrosia artemisiifolia) in Slovakia in the year 2017 HRABOVSKÝ, M., MIČIETA, K. 25 UNIVERSITATIS COMENIANAE Macroscopic fungi of the valley of the Lamačský potok stream (Malé Karpaty Mts.) JANČOVIČOVÁ, S., MIŠKOVIC, J., SENKO, D., SHARIFIOVÁ, S. 29 Bryophytes in cemeteries in the Small Carpathian region (Slovakia) MIŠÍKOVÁ, K., ORBÁNOVÁ, M., GODOVIČOVÁ, K. 45 Jubilee 54 53/2018 ISBN 978-80-223-4687-0 ISSN 0524-2371 COMENIUS UNIVERSITY IN BRATISLAVA ACTA BOTANICA UNIVERSITATIS COMENIANAE Volume 53 2018 COMENIUS UNIVERSITY IN BRATISLAVA 1 The journal was edited with the title / Časopis bol vydávaný pod názvom Acta Facultatis rerum naturalium Universitatis Comenianae, Botanica Editor in Chief / Predseda redakčnej rady Karol Mičieta; [email protected] Executive Editor / Výkonný redaktor Soňa Jančovičová; [email protected] Editorial Board / Členovia redakčnej rady Dana Bernátová, Michal Hrabovský, Katarína Mišíková, Jana Ščevková Editor Ship / Adresa redakcie Redakcia Acta Botanica Universitatis Comenianae, Révová 39, SK-811 02 Bratislava 1 Tel. ++421 2 54411541 Fax ++421 2 54415603 Published by / Vydavateľ © Comenius University in Bratislava, 2018 © Univerzita Komenského v Bratislave, 2018 ISBN 978-80-223-4687-0 ISSN 0524-2371 2 Acta Botanica Universitatis Comenianae Vol. 53, 2018 RUDERAL PLANT COMMUNITIES FROM THE CLASS STELLARIETEA MEDIAE R. Tx. et al. ex von Rochow 1951 IN BRATISLAVA CITY Alena Rendeková •, Karol Mičieta Comenius University in Bratislava, Faculty of Natural Sciences, Department of Botany, Révová 39, 81102 Bratislava, Slovakia Received 20 August 2018; Received in revised form 23 August 2018; Accepted 26 September 2018 Abstract The paper referes about the research of ruderal plant communities from the class Stellarietea mediae R. Tx. et al. ex von Rochow 1951 in Bratislava city. We present our own phytosociological relevés of ruderal communities from this class and the results of their numerical classification. We also present information about the floristic composition and distribution of recorded communities and we compare our own findings with data published from other areas of Slovakia. In total, 19 communities of the class Stellarietea mediae were recorded in Bratis- lava, included also some rare and the little-known communities. Several communities from this class were domi- nated by alien plants, for example, in the stands of Conyza canadensis community [Stellarietea mediae] invasive neophyte Conyza canadensis dominated. Key words: synanthropic vegetation, alien plants, phytosociology, numerical classification, Slovakia Introduction Ruderal vegetation is a permanent component of urban agglomerations and other man-affected sites. Ruderal plant communities represent one of the most dynamic types of vegetation. Their development reflects the impact of humans on the environment and only small changes in human activities can result in extensive changes in the species composition and spectrum of ruderal communities. There is an increased frequency of occurrence of alien plant species in the ruderal vegetation. Therefore, the re- search of ruderal vegetation is very important and numerous studies has been devoted to this issue. Research of ruderal vegetation in Slovakia began after the World War II within the research of syn- anthropic vegetation. During the first decades it was focused on the vegetation of smaller areas, e.g. Liptovská kotlina Basin (Hilbert 1981), north-eastern Slovakia (Jarolímek, Zaliberová 1995, Zalibe- rová, Jarolímek 1995) or some Slovak cities such as Malacky (Krippelová 1972) and Trnava (Eliáš 1979). In the year 1997, the synthetic study of synanthropic vegetation of whole area of Slovakia was published by Jarolímek et al. (1997). The ruderal vegetation of Bratislava was researched by Jarolímek (1983) in 1983. Since then no recent study has been published from this city, except of the papers by Rendeková (2016), Rendeková, Mičieta (2017), Rendeková et al. (2014, 2017, 2018), Valachovič (2016). These studies inform about some ruderal communities in Bratislava, but they do not pay special attention to the communities of the class Stellarietea mediae. Jarolímek, Valachovič (2016) refered about two rare plant communities from this class, but comprehensive study of ruderal communities of the class Stellarietea mediae from Bratislava is missing. This paper can bridge this gap. In this study, we present the results of evaluation of the data of ruderal vegetation of the class Stell- arietea mediae from Bratislava. This class includes synanthropic communities formed mostly by annual • Corresponding author: Alena Rendeková; e-mail: [email protected] 3 plants growing on cultivated soils and disturbed areas. The majority of ruderal communities of this class belong to the ordo Sisymrietalia and some of them also to the ordo Eragrostietalia (Jarolímek et al. 1997, Jarolímek, Šibík 2008). We aimed to: 1. record the ruderal plant communities of the class Stellarietea mediae in the area of Bratislava, 2. classify the recorded phytosociological relevés into the syntaxa by numerical evaluation of the data. Material and Methods The study was carried out in Bratislava, the capital of Slovakia, located in Central Europe. The area of city covers 367.9 km2 and the city has a population of approximately 425,500 people. The city has a climate of moderate to warm continental character, and it is one of the warmest and driest zones of Slovakia. The natural soils of Bratislava in ruderal areas are covered by anthropogenic ones (Feráková, Jarolímek 2011). Phytosociological data were sampled according to the methods of Zürich-Montpelliere school (Braun- Blanquet 1964) during the vegetation seasons of the years 2011–2014.The modified Braun-Blanquet cover-abundance scale, extended by 2a, 2b and 2m values was used (Barkman et al. 1964). The relevés were imported into TURBOWIN database (Hennekens, Schaminée 2001), and subsequently edited in the JUICE programme (Tichý 2002). Phytosociological relevés were assigned to associations by numerical classification (cluster analy- sis), which was performed in the SYN-TAX 2000 programme (Podani 2001). Data were not trans- formed. The communities documented by one or two relevés only were excluded from the analysis. Various group linkage methods and coefficients were tried. The Group average method in combination with Wishart's index proved to be the most effective linkage method and distance measure and the results obtained by them corresponded to our field experience. These parameters were used in the dendrogram, which demonstrates the results of the analysis (Fig. 1). The SYN-TAX 2000 programme (Podani 2001) was used to create the dendrogram (Fig. 1). Relevés of communities, which were recorded on more than two localities, are presented in the phy- tosociological table (Tab. 1). The relevés of communities recorded on one or two localities only are given separately below the table. We do not present relevés of the recorded associations Kochietum densiflorae, Polygono-Portulacetum oleraceae and Geranium pusillum community [Sisymbrion offici- nalis] and Poa bulbosa community [Sisymbrion officinalis], because they were already published by Rendeková et al. (2014) and Rendeková (2016). In the table, we present only the total values of frequency of taxa (%) for these communities. These communities were included to the list of recorded communities and to the analysis, because it would not be complete without them. The relevés from Geranium pusillum community [Sisymbrion officinalis] were pulished as relevés from Geranium pusillum community [Stellarietea mediae] by Rendeková (2016), but based on the results of numerical classification we assign- ed this community to the alliance Sisymbrion officinalis. Phytosociological table (Tab. 1) was created using the JUICE programme (Tichý 2002). Relevés in columns of the table are arranged according to the results of numerical classification. The relevé num- bers in the table correspond to the numbers on dendrogram (Fig. 1). Total values of frequency of taxa (%) are listed in the last column of each association or community recorded by more than four relevés. Taxa are ordered into groups according to their syntaxonomical relations. Diagnostic, characteristic and constant taxa were determined according to the publications of Jarolímek et al. (1997) and Jarolí- mek, Šibík (2008). Within the gorups, taxa are ordered according to the decreasing frequency. Cover- abundance values 2a and 2b are presented in abbreviated forms a and b in the table. Taxa found only in one relevé are listed below the table. Behind the each taxon listed below the table, we present num- ber in bracket, which represents number of relevé in which taxon was recorded. Number or sign behind the bracket indicates the cover-abundance value of the taxon. Localities and other relevés data are listed below the table too. The nomenclature of the taxa follows Marhold, Hindák (1998), the nomenclature of the syntaxa follows Jarolímek, Šibík (2008). 4 Results and Discussion The numerical classification of the ruderal communities of the class Stellarietea mediae Results of the numerical classification of the recorded relevés are demostrated in the dendrogram in the Fig. 1. In the dendrogram, clusters 'x', 'y' and 'J' are separated at the highest level of dissimilarity.
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