Document Detail

Exploring the mechanisms causing a high allometric value of female pleopod in the crayfish Procambarus clarkii.
MedLine Citation:
PMID:  16082160     Owner:  NLM     Status:  MEDLINE    
Female pleopods in Procambarus clarkii have a function of holding eggs, and their length shows positive allometry. It is likely that the positive allometry has resulted from directional selection in terms of egg holding ability. Firstly, we examined the allometry of reproductive potential (ovarian egg number). The allometric value of reproductive potential was lower than that of pleopod length, which indicates that the positive allometry of pleopod length is not merely the reflection of the allometry of reproductive potential. Secondly, we examined the relationship between the relative length of pleopod and egg holding ability to test the presence of directional selection on the pleopod length, and then compared the strength of the directional selection between the individuals differing in their body sizes to infer the mechanisms causing the positive allometry for female pleopods. There was a positive relationship between relative pleopod length and relative egg mass remaining to the pleopod, and this relationship was stronger in small individuals. These relationships were not merely the reflection of relationship between pleopod length and reproductive potential. These results indicate that directional selection was acting on the length of female pleopods, and the strength of the directional selection was stronger in smaller individuals. Therefore, it appears that the positive allometry of female pleopods in P. clarkii has been caused by the constraint for possessing longer pleopods in small individuals, although the mechanisms of the constraint remain unknown.
Naoko Kato; Tadashi Miyashita
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Zoological science     Volume:  22     ISSN:  0289-0003     ISO Abbreviation:  Zool. Sci.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-08-05     Completed Date:  2005-10-04     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8702287     Medline TA:  Zoolog Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  717-21     Citation Subset:  IM    
Laboratory of Biodiversity Science, School of Agriculture and Life Sciences, The University of Tokyo, Japan.
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MeSH Terms
Astacoidea / anatomy & histology*,  genetics
Body Size
Extremities / anatomy & histology
Multivariate Analysis
Regression Analysis
Reproduction / physiology
Selection, Genetic*

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