engleski

Cylindrospermopsis raciborskii – tropical, invasive cyanobacteria in Kopački Rit

The cyanobacterium Cylindrospermopsis raciborskii (Woloszynska) Seenaya et Subba Raju is an invasive toxic, originally tropical to subtropical species, which is nowadays widely distributed in freshwaters of temperate regions. The occurrence of C. raciborskii blooming was detected occasionally in the Kopački Rit floodplain. The aim of this study was to determine the influence of environmental factors on the growth and development of C. raciborskii, with special emphasis on the development of different morphological forms and their vertical distribution in the water column. The research was conducted during the summer period of 2003, 2007, 2008 and 2011 in Lake Sakadaš (Kopački Rit Nature Park). The abundance of C. raciborskii filaments was always higher in the upper layers as compared to the deeper layers of the water column. At the beginning of the development, the presence of only one morphological form (primary filament) of C. raciborskii was recorded. At the later stage, besides primary filaments, six morphological forms of secondary filaments were found. The morphological forms differentiated according to filament length and width as well as akinete size. According to the redundancy analysis, high water temperature and high concentration of nutrients were the most important environmental factors that influenced the development and vertical distribution of C. raciborskii. Continuous monitoring of Kopački Rit waters is essential to track the spreading of this species in the Danube region.

floodplain lake; temperate region; blooming; environmental factors; morphological forms

nije evidentirano