Abstract
Biological invasion is a crucial problem in the world because of its negative consequences for protected areas. The degradation stage of vegetation might affect the success of invasion. One of the most abundant and threatening invasive species is the common milkweed (Asclepias syriaca L.) which has invaded already 23 countries of Europe and in several habitat types its further spreading is promoted by climate change. Pannonian sand grassland is one of the most threatened habitat by common milkweed invasion. Therefore, invasion in sand grassland vegetation is an important issue. However, the effects of the invasive plant in the open sand grassland are rather controversial. In order to clarify the existing contradictory results, the study was carried out in a strictly protected area, near Fülöpháza (Hungary) in a reserve core area in a UNESCO biosphere reserve. Microcoenological study was applied to determinate the fine-scale community characteristics of non-invaded and invaded stands in natural and seminatural vegetation and data were processed by Juhász-Nagy’s information theory models. Shannon diversity of species combinations (compositional diversity) which describes the ways of the coexistence of species, and the number of realized species combinations were used for measuring beta diversity. Differences between stands were analyzed by two-way ANOVA. The maximum compositional diversity of species and main life-forms (annuals, perennials and cryptogams) did not differ significantly between the non-invaded and invaded stands. In contrast, significantly larger characteristic areas of compositional diversity were detected in the invaded stands. Based on these results, it could be concluded that diversity of species combinations did not change but those values have shifted to coarser scales in case of invaded stands. The direction of this change suggests a kind of impoverishment in the presence of Asclepias. Thus, it is worth mentioning from the invasion management point of view that protection of the habitats against disturbance is a more cost-effective and successful way than protection against the establishment or extirpation of invasive species, since disturbance facilitates the invasions throughout the impoverishment of the community.
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Abbreviations
- CD:
-
Compositional (species combination) Diversity
- CA:
-
Characteristic Area
- JNP-functions:
-
Juhász-Nagy’s functions
- NRC:
-
Number of Realized species Combinations
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Acknowledgements
acknowledge the general support of the Kiskunság National Park Directors to authorize this field work in the strictly protected area. I gratefully thank for corrections of valuable comments of Á. Szepesi and I. Bagi from Department of Plant Biology, University of Szeged and two anonymous reviewers, who helped me to improve the manuscript. I am very grateful for the help and suggestion of A. Horváth in the application of the INFOTHEM 3.01 program. Last but not least I would like to thank for the assistance during the field work to E. Dóri.
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Bakacsy, L. Invasion impact is conditioned by initial vegetation states. COMMUNITY ECOLOGY 20, 11–19 (2019). https://doi.org/10.1556/168.2019.20.1.2
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DOI: https://doi.org/10.1556/168.2019.20.1.2