This study compares the vegetation and seed deposits of free-flowing parts of a river with those regulated by straightening, as well as identifying the correlation between the breadth of the river-bed, existent vegetation and distribution of plant species along the river corridor. The 31 sampling plots in the Ukrainian Carpathians, at an equal distance of four km from each other, were positioned across different vegetation zones. Vegetation and seed bank data were collected. The study showed that effective distribution of plants has a place in native (non-regulated) river-corridors with a river-bed breadth of 15-30 m. The reduction and straightening of the river-bed decrease the number of species that can be dispersed along river. The percentage of seeds of alien species greatly increases, from 0.1% in the free-flowing to 10% in the regulated parts of rivers. River regulation causes transformation of native vegetation communities in these plots into associations of invasive herbaceous perennial species; such as associations of Helianthus tuberosus and Solidago gigantea. The analyses do not show a clear link between the breadth of the river-bed and number of invasive species in the vegetation community. The research suggests that river regulation has a clear negative effect on vegetation by decreasing the resistance of plant communities to alien species
1. Andersson E., Nilsson C. and Johansson M. E., 2000 ‒ Effects of river fragmentation on plant dispersal and riparian flora, Regulated Rivers: Research and Management 16, 1, 83-89.
2. Bennett G. and Mulongoy K. J., 2006 ‒ Review of experience with ecological networks, corridors and buffer zones, Secretariat of the Convention on Biological Diversity, Montreal, Technical Series, 23, 100.
3. Bodnar V. L., 1987 ‒ Natural resources of Transcarpathia/Num. auth., (ed.), Bodnar V. L., Uzhgorod Carpathians, 284.
4. Braun-Blanquet J., 1964 ‒ Pflanzensoziologie, Grundzüge der Vegetationskunde, (3. Auflage), Springer Verlag, Wien, 865. (in German)
5. Curtean-Bănăduc A., Schneider-Binder E. and Bănăduc D., 2014 ‒ The importance of the riverine ligneous vegetation for the Danube Basin lotic ecosystems, in Cianfaglione K. (ed.), L’importanza degli Alberi e del Bosco, Cultura, scienza e coscienza del territorio, Temi Ed., Trento, Italia, ISBN: 978-88-973772-63-9, I-II, 187-210
6. De’camps H. and Tabacchi E., 1994 ‒ Species richness in vegetation along river margins, in Giller P. S., Hildrew A. G. and Rafaelli D. G. (eds), Aquatic Ecology: Scale, Pattern and Process, Blackwell Scientific Publications, London, 1-10.
7. Dynesius M. and Nilsson C., 1994 ‒ Fragmentation and flow regulation of river systems in the northern third of the world, Science, 266, 753-762.
8. Englund G., Jonsson B. G. and Malmqvist B., 1997 ‒ Effects of flow regulation on bryophytes in North Swedish rivers, Biological Conservation, 79, 79-86.
9. Herenchuk K. I. (ed.), 1981 ‒ Nature of Zakarpatska Oblast, Lviv: Publisher High School, 156. (in Ukrainian)
10. Maysuryan N. A. and Atabekova A. I., 1978 ‒ The determinant of the seeds and fruits of weeds, Edition 2th, 288.
11. Naiman R. J. and De’camps H., 1997 ‒ The ecology of interfaces: riparian zones, Annual Review of Ecology and Systematics, 28, 621-658.
12. Naiman R. J., De’camps H. and Pollock M., 1993 ‒ The role of riparian corridors in maintaining regional biodiversity, Ecological Application, 3, 209-212.
13. Nilsson C. and Jansson R., 1995 ‒ Floristic differences between riparian corridors of regulated and free-flowing boreal rivers, Regulation Rivers, 11, 55-66.
14. Nilsson C., Gardfjell M. and Grelsson G., 1991 ‒ Importance of hydrochory in structuring plant communities along rivers, Canadian Journal of Botany, 69, 2631-2633.
15. Nilsson C., Nilsson E., Johansson M. E., Dynesius M., Grelsson G., Xiong S., Jansson R. and Danvind M., 1993 ‒ Processes structuring riparian vegetation, Current Topics in Botanical Research, 1, 419-431.
17. Pop S. S., 2003 ‒ Natural resources of the Transcarpathia, Uzhgorod: L. L. C. “Spektral”, 296. (in Ukrainian)
18. Prots B. 2010 ‒ Europas unbekannte Urwälder in Transkarpatien, Ost-West, Europäische Perspektiven, 11, 3, 212-218. (in German)
19. Schneider R. L. and Sharitz R. R., 1986 ‒ Seed bank dynamics in a southeastern riverine swamp, American Journal of Botany, 73, 7, 1022-1030.
20. Skoglund S. J., 1990 ‒ Seed dispersing agents in two regularly flooded river sites, Canadian Journal of Botany 68, 754-60.
21. Ter Heerdt G. N. J., Verweij G. L., Bekker R. M. and Bakker J. P. 1996 ‒ An improved method for seed-bank analysis: seedling emergence after removing the soil by sieving, Functional Ecology 10, 144-151.
22. Toner M. and Keddy P., 1997 ‒ River hydrology and riparian wetlands: a predictive model for ecological assembly, Ecological Application, 71, 236-246.
23. Willson M. F., 1992 ‒ The ecology of seed dispersal, in Fenner (ed.) Seeds, The ecology of regeneration in plant communities, CAB International, Wallingford, 61-85.
24. Willson M. F., Rice B. L. and Westoby M., 1990 ‒ Seed dispersal spectra: a comparison of temperate communities, Journal of Vegetation Science, 1, 547-560.