![]() The crayfish plague agent, however, may reach the delta substantially earlier, through dispersal downstream among populations of native crayfish. limosus may invade the sensitive Danube delta area in the mid-2060s, even without long-distance dispersal. limosus invasion front (at the time of sampling). leptodactylus captured about 70 km downstream of the O. astaci DNA in at least 32% of the analysed invasive (n = 71) and 41% of the native (n = 49) crayfish coexisting in the Danube. An agent-specific real-time PCR analyses demonstrated the presence of A. 15 km yr-1 in August 2011, it was already present in the upper 105 km of the Romanian Danube. limosus expanded downstream at a rate of ca. leptodactylus dramatically decreased in abundance. limosus steadily increased with time, while the native A. Squid Game (2021) - S01E06 Gganbu clip with quote 'The Blue Danube'. Between January 2009 and March 2011, the relative abundances of O. limosus at 6 sites on the Romanian Danube and checked for the invasive species in 4 of its tributaries. We monitored, at monthly intervals for over 2 yr, occurrence of native A. Two of these invaders, Pacifastacus leniusculus and Orconectes limosus, have extended their distribution in the River Danube catchment the latter was detected for the first time in Romania in 2008. Native European crayfish, such as Astacus leptodactylus, are threatened, among other factors, by the crayfish plague agent Aphanomyces astaci, dispersed by invasive North American crayfish. ![]()
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