Spreading of Bryozoa Pectinatella magnifica in Třeboňsko region

Pectinatella magnifica is a fresh water invertebrate colonial animal originating from North America which spreading, throughout Europe as well as Asia, has recently reached a characteristics of invasion. Charakter of the colonies, their seasonnal dynamics and other development aspects have been studied at six destinations in South Bohemia (lake Cep, Nový Lipnický pond, Hejtman pond, Nový Kanclíř pond, Vlkov sandpit and Hnevkovice water reservoir). Repeated biomass quantitative collections have been carried out in 10 m transects alongside the shoreline. Also the environmental factors have been found out (temperature, conductivity, water reactions, transparency, trophia, colonies substrate) and charakteristics of individual invaded reservoirs. The list of currently known destinations has been completed with another reservoirs into which the species has spread out