| Urine makes the difference: chemical communication in fighting crayfish made visible. | |
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MedLine Citation:
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PMID: 11948199 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Chemical communication is a widespread phenomenon in aquatic animals but is difficult to investigate because the signals are not visible. Here, we present the results of a study into chemical communication in blindfolded fighting crayfish (Astacus leptodactylus) in which we employed a new method: visualisation of urine using the dye Fluorescein. The probability of urine release is greater during fights than during non-social activities or inactivity. The eventual winners are more likely to release urine during fights than the eventual losers. In both winners and losers, urine release is coupled to offensive behaviours, and the probability of urine release increases with increasing levels of aggression. In A. leptodactylus, urine is carried to the opponent by the forward-projecting gill currents. During spontaneous release, urine is fanned laterally with the aid of the exopodites of the maxillipeds. Aggressive behaviour is effective in intimidating blindfolded opponents only in conjunction with urine release: receivers decrease offensive behaviour and increase defensive behaviour. Aggressive behaviour alone does not intimidate opponents. The loser of a recent fight is deterred equally well by a familiar and an unfamiliar opponent. Hence, in crayfish, individual recognition of the urine scent of a dominant individual does not appear to be significant for the maintenance of dominance hierarchies. Our results suggest that urine contains information about the fighting ability and/or aggressiveness of the signaller. The chemical signals thus far unidentified appear to be important in determining the outcome of a fight. |
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Authors:
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Thomas Breithaupt; Petra Eger |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of experimental biology Volume: 205 ISSN: 0022-0949 ISO Abbreviation: J. Exp. Biol. Publication Date: 2002 May |
Date Detail:
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Created Date: 2002-04-11 Completed Date: 2002-10-04 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: England |
Other Details:
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Languages: eng Pagination: 1221-31 Citation Subset: IM |
Affiliation:
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Fakultät für Biologie, Universität Konstanz, Postfach 5560 (M618), D-78457 Konstanz, Germany. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aggression
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physiology* Animals Astacoidea / physiology* Behavior, Animal / physiology* Fluorescein Male Signal Transduction Social Dominance Urine / physiology* |
| Chemical | |
Reg. No./Substance:
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2321-07-5/Fluorescein |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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