Social control of unreliable signals of strength in male but not female crayfish, Cherax destructor

Walter, Gregory M., van Uitregt, Vincent O. and Wilson, Robbie S. (2011) Social control of unreliable signals of strength in male but not female crayfish, Cherax destructor. The Journal of Experimental Biology, 214 19: 3294-3299. doi:10.1242/jeb.056754

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Author Walter, Gregory M.
van Uitregt, Vincent O.
Wilson, Robbie S.
Title Social control of unreliable signals of strength in male but not female crayfish, Cherax destructor
Formatted title
Social control of unreliable signals of strength in male but not female crayfish, Cherax destructor
Journal name The Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
1477-9145
Publication date 2011-10-01
Sub-type Article (original research)
DOI 10.1242/jeb.056754
Open Access Status File (Publisher version)
Volume 214
Issue 19
Start page 3294
End page 3299
Total pages 6
Place of publication Cambridge, U.K.
Publisher The Company of Biologists
Collection year 2012
Language eng
Formatted abstract
The maintenance of unreliable signals within animal populations remains a highly controversial subject in studies of animal communication. Crustaceans are an ideal group for studying unreliable signals of strength because their chela muscles are cryptically concealed beneath an exoskeleton, making it difficult for competitors to visually assess an opponent's strength. In this study, we examined the importance of social avenues for mediating the possible advantages gained by unreliable signals of strength in crustaceans. To do this, we investigated the factors that determine social dominance and the relative importance of signalling and fighting during aggressive encounters in male and female freshwater crayfish, Cherax destructor. Like other species of crayfish, we expected substantial variation in weapon force for a given weapon size, making the assessment of actual fighting ability of an opponent difficult from signalling alone. In addition, we expected fighting would be used to ensure that individuals that are weak for their signal (i.e. chela) size would not achieve higher than expected dominance. For both male and female C. destructor, we found large variation in the actual force of their chela for any given weapon size, indicating that it is difficult for competitors to accurately assess an opponent's force on signal size alone. For males, these unreliable signals of strength were controlled socially through increased levels of fighting and a decreased reliance on signalling, thus directly limiting the benefits accrued to individuals employing high-quality signals (large chelae) with only low resource holding potential. However, in contrast to our predictions, we found that females primarily relied on signalling to settle disputes, resulting in unreliable signals of strength being routinely used to establish dominance. The reliance by females on unreliable signals to determine dominance highlights our poor current understanding of the prevalence and distribution of dishonesty in animal communication.
Keyword Biting
Performance
Sexual selection
Fiddler-crab
Weapon size
Evolution
Honest
Communication
Deception
Strategy
Traits
Fights
Dispar
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
 
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