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FRESHWATER CRAYFISH | 2006| vol. 15| Research Article
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Full Citation: SCHULZ, H. K., SMIETANA, P., MAIWALD, T., OIDTMANN, B. and SCHULZ, R. (2006). Case studies on the co-occurrence of Astacus astacus (L.) and Orconectes limosus (Raf.): snapshots of a slow displacement. Freshwater Crayfish 15: 212-219.
Abstract:
Four lakes with known co-existence of the non-indigenous crayfish Orconectes limosus and the European
native crayfish Astacus astacus in northwestern Poland were studied in summer 2003. O. limosus was
introduced into the lakes between one and ten years ago. The population structure of both species and the
frequency of injuries were estimated bymeans of mark and recapture, hand catching and scuba-diving. Using
molecular diagnostics and infection experiments, no positive indications were found that these populations of
O. limosus are carriers of the crayfish plague. Increased frequencies of injured A. astacus with an increasing
proportion of O. limosus and the dominance of O. limosus after 10 years of coexistence suggests that
O. limosus is able to replace A. astacus in direct competition.
Keywords: Aphanomyces astaci; Astacus astacus; co-occurrence; crayfish plague; Orconectes limosus; Poland; species displacement;
Article Language: English
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