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First published online February 27, 2009
Journal of Experimental Biology 212, 853-858 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.024547
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Costs and benefits of increased weapon size differ between sexes of the slender crayfish, Cherax dispar

Robbie S. Wilson1,2,*, Rob S. James3, Candice Bywater1 and Frank Seebacher4

1 School of Integrative Biology, The University of Queensland, St Lucia, QLD, 4072 Australia
2 The Ecology Centre, The University of Queensland, St Lucia, QLD, 4072 Australia
3 Department of Biomolecular and Sport Sciences, Coventry University, Coventry, CV1 5FB, UK
4 School of Biological Sciences, A08, The University of Sydney, Sydney, NSW, 2006 Australia


Figure 1
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  		Fig. 1. The relationship between (A) body length and (B) chela size (first component derived from a PCA on the seven morphological variables) with maximum chela closing force for males (N=97) and females (N=60) of the Australian slender crayfish (Cherax dispar). Data points for the males are denoted by the open circle symbols and females by the closed circle symbols. A significant relationship between body length (BL) and chela force (Fmax) was detected for both males (Fmax=1.67–63.8 BL) (R2=0.38; P<0.0001) and females (Fmax=0.42–7.56 BL) (R2=0.45; P<0.0001). In addition, we also detected a significant relationship between chela size (CS) and chela force (Fmax) for both males (Fmax=13.5+19.1 CS) (R2=0.54; P<0.0002) and females (Fmax=1.59+3.91 BL) (R2=0.42; P<0.0001).

 

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  		Fig. 2. Relative wrist depth, maximum chela depth, propodus length and dactylus length for males (black bars) and females (grey bars) of the Australian slender crayfish (Cherax dispar). Effects of overall chela size were removed from the analysis by taking the residuals of morphological measurements from a regression with `chela size' (first axis of PCA). Significant differences were detected between sexes for all four morphological measurements. Data show means ± s.e.m.

 

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  		Fig. 3. The relationship between chela size and burst escape swim speed for (A) males and (B) females of the Australian slender crayfish (Cherax dispar). Males displayed a negative correlation between chela size and swim speed (N=41, rp=–0.57; P<0.01) but there was no significant correlation for females (N=28, rp=–0.26; P=0.18). Chela size was determined separately for males and females and was taken as first component derived from a PCA on the seven morphological variables.

 

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© The Company of Biologists Ltd 2009