Abstract
The attractiveness of shelters and the relationship between crayfish size and refuge size were investigated in the stone crayfish Austropotamobius torrentium. Shelter suitability was mainly determined by water velocity, stone surface area and stone width. Water depth and stone height had no influence on crayfish occupancy of stones. Austropotamobius torrentium avoided shelters in areas of water velocities exceeding 25 cm s−1. They preferred large stones with a bearing surface greater than 300 cm2. The probability of crayfish occupation rose quickly as stones' bearing surface increased up to 900 cm2. Crayfish were exclusively caught underneath stones at least 3.19 times longer and 1.25 times wider than the carapace length of the refuge occupant. Large males occupied larger stones, where no relationship was detected between female size and stone refuge size.
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Streissl, F., Hödl, W. Habitat and shelter requirements of the stone crayfish, Austropotamobius torrentium Schrank. Hydrobiologia 477, 195–199 (2002). https://doi.org/10.1023/A:1021094309738
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DOI: https://doi.org/10.1023/A:1021094309738