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| ŠUMARSKI LIST 3-4/2015 str. 41 <-- 41 --> PDF |
NEW INVASIVE FOREST COMMUNITIES IN THE RIPARIAN FRAGILE HABITATS – THE CASE STUDY FROM RAMSAR SITE CARSKA BARA (VOJVODINA, SERBIA) NOVE INVAZIVNE ŠUMSKE ZAJEDNICE POPLAVNIH OSJETLJIVIH STANIŠTA – STUDIJA SLUČAJA IZ RAMSARSKOG PODRUČJA CARSKA BARA (VOJVODINA, SRBIJA) Vera Batanjski, Eva Kabaš, Nevena Kuzmanović, Snežana Vukojičić, Dmitar Lakušić, Slobodan Jovanović Summary The phytosociological investigation of habitats with highly invasive tree species Acer negundo L. and Fraxinus pennsylvanica Marshall was performed in Ramsar site Carska bara (Vojvodina, Serbia). A total of 107 species were noticed within 32 relevés. Recorded relevés are georeferenced and analysed in detail. The results of the relevant numerical analyses suggest the existence of two floristically and coenologically well defined groups of stands defined as the forest communities: Rubo caesii–Aceretum negundi ass. nova and Carici otrubae–Fraxinetum pennsylvanicae ass. nova. The increasing dispersal rate of the invasive trees is detected as a problem amongst many fragile wet habitats across Serbia and SE Europe, alerting their urgent and effective control. KEY WORDS: invasive trees, Acer negundo, Fraxinus pennsylvanica, forest communities, wetland. Introduction Uvod It is known that invasive alien species are the second risk factor of biodiversity endangering, right after habitat destruction (Brennan and Withgott, 2011). According to the European strategy on invasive alien species, they are one of the biggest challenges in the preservation of biodiversity in Europe (Genovesi and Shine, 2003). Negative consequences of the presence and spreading of the invasive species were analyzed by numerous authors (Elton, 1958; Drake et al., 1989; Di Castri et al., 1990; Williamson, 1996; Starfinger et al., 1998; Tilman, 1999; Parker et al., 1999; Hejda et al., 2009; Pyšek and Richardson, 2010). Threats to the autochthonous biodiversity and degradation of the natural habitats become the most prominent when the invasive species become naturalized and form stable communities. Field studies and experiments confirmed that the presence of the alien species can be a threat to the native species, primarily due to the negative effects of the competition (Vilà and Weiner, |