Knowledge of movement patterns is essential for the effective conservation of noble crayfish (Astacus astacus) and stone crayfish (Austropotamobius torrentium), two endangered species indigenous to Central Europe. Radiotelemetry was used to evaluate diel changes in ranging
behaviour and local activity of both species at a locality where they occur sympatrically. Both species exhibited similar behaviour, migrating mostly in the upstream direction. Movement probability differed significantly within both species between phases of the diel cycle. Movement probability
within 3-h tracking intervals was highest at dawn (18.18%) and night (15.32%) in A. astacus, and at dawn (37.25%) in A. torrentium. Astacus astacus moved the longest distances during the dawn interval (3.70 m) and the shortest during the day (1.41 m) and night (1.61 m)
interval. The distances moved by A. torrentium did not differ significantly in different phases of the diel cycle. Local activity was highest at dusk in A. astacus (40.6% likelihood of activity) and during dusk and night hours in A. torrentium (30.8% and 24.2% likelihood
of activity). Body size and environmental parameters (light intensity, weather, atmospheric pressure, water temperature and turbidity) also influenced crayfish behaviour. Both species exhibited a post-handling fright response, which (e.g. in mark-recapture studies) can lead to the overestimation
of movement rates and the extent of natural migrations.
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Document Type: Research Article
Publication date: September 1, 2018
This article was made available online on August 13, 2018 as a Fast Track article with title: "Telemetry of co-occurring noble crayfish (Astacus astacus) and stone crayfish (Austropotamobius torrentium): diel changes in movement and local activity".
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Fundamental and Applied Limnology is an international journal for freshwater research in the widest sense, including problems of marine biology and brackish water research. Papers dealing with ecological topics are especially welcome in association with experimental or physiological studies. All papers published in this journal are subject to peer review.
Archiv für Hydrobiologie, now Fundamental and Applied Limnology has been published continuously since 1906.
Volumes prior to vol. 168 were published under the previous title Archiv für Hydrobiologie.
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