The daily activity patterns of Euastacus sulcatus in southeast Queensland

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Title The daily activity patterns of Euastacus sulcatus in southeast Queensland
Author Furse, James Michael; Wild, Clyde Hamilton; Sirotti, Simon; Pethybridge, Heidi
Publication Title 15th Symposium of the International Association of Astacology
Editor David Rogers
Year Published 2004
Place of publication London
Publisher International Association of Astacology
Abstract Freshwater crayfish are regarded as principally nocturnal, however Euastacus sulcatus is commonly observed during daylight hours, both in-stream, and wandering overland, suggesting that this species is diurnal. During the winter–summer of 2002/2003 we investigated the activity patterns of E. sulcatus using a series of continuous 24 hour observation sessions. The results of this study indicate that this species is active in all seasons, except for large crayfish (>40 mm OCL), which are rarely observed in spring and winter, but are common in summer. We conclude that E. sulcatus is a diurnal species, and that peak activity generally occurs around midday in all seasons, except in the case of small crayfish (<25 mm OCL), which become nocturnal in summer when the time of their peak activity changes from around midday, to around midnight. We suggest that this general pattern of diurnal activity may be a predator–avoidance strategy, as many carnivorous Australian mammals are nocturnal. The nocturnal activity patterns seen in small crayfish during summer may also be a predator–avoidance strategy, but the diurnal predators in this case could be the large crayfish, which are active only in the summer.
Peer Reviewed Yes
Published Yes
Publisher URI http://iz.carnegiemnh.org/crayfish/iaa/symposia.htm
Conference name 15th Symposium of the International Association of Astacology
Location London
Date From 2004-03-29
Date To 2004-04-02
Date Accessioned 2006-04-21
Date Available 2010-08-03T09:04:05Z
Language en_AU
Research Centre Environmental Futures Research Institute
Faculty Faculty of Environmental Sciences
Subject PRE2009-Freshwater Ecology; PRE2009-Sociobiology and Behavioural Ecology
Publication Type Conference Publications (Full Written Paper - Refereed)
Publication Type Code e1a

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