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Title: Field and laboratory studies of the behaviour of the swimming crab Liocarcinus depurator (Linnaeus)
Author: Glass, Christopher William
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1985
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Field observations were made at Loch Sween in an attempt to describe the behaviour and ecology of L.depurator. Abundance varied over time with peak abundance occurring during periods of warm water. Peak densities of 1 crab/7m [sq] were observed but average density was much lower at 1 crab 25m [sq]. Some evidence was obtained for migration from the study site similar to that reported for other species. Tagging studies revealed no long term site attachment. Populations were found to be sex biased in favour of male during summer months and individuals were most commonly observed within 1m of the nearest conspecific. Ovigerous crabs were observed in two distinct phases between April and September and recruitment of juvenile crabs; occured in early spring. Observations on food and feeding behaviour showed L depurator to be a predator of sessile or slow moving benthic macroinvertebrates. The main types of escape response were observed and discussed. The incidence of physical damage and naturally occurring aggression in the field were low. Investigation into the locomotor activity of individual swimming crabs in the laboratory showed that shallow water (<9m) crabs displayed significant cyclic locomotor activity while deep water (>30m) crabs displayed arhythmic activity.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QL Zoology Zoology Oceanography Hydrology