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North American crayfish species are natural hosts of the crayfish plague pathogenAphanomyces astaci. The spiny-cheek crayfish Orconecteslimosus, widespread in Central Europe, is the main reservoir of A.astaci in Czech Republic. We tested if there are temporal changes in theprevalence of infected individuals (i.e., the proportion of individualsin which the pathogen is detected) in spiny-cheek crayfish populations. Crayfish fromthree populations shown previously to be infected to different extents (high, intermediateand low), were repeatedly sampled in different years (2004–2010) and seasons. The presenceof A. astaci in the soft abdominal crayfish cuticle was tested byspecific amplification of the pathogen DNA. There was no substantial temporal variation inpathogen prevalence in the highly and very lowly infected populations. However, asignificant long-term as well as seasonal decrease was found in the intermediatelyinfected population. This decline could be related to a decrease in population densityover the studied years, and to crayfish seasonal moulting, respectively. A reliableestimate of pathogen prevalence in American crayfish populations thus requires repeatedmonitoring over years, preferably during the same season before the main period ofcrayfish moulting

Temporal variation in the prevalence of the crayfish plague pathogen,Aphanomyces astaci, in three Czech spiny-cheek crayfish populations