Document Detail

The ontogeny of fluctuating asymmetry.
MedLine Citation:
PMID:  12858277     Owner:  NLM     Status:  MEDLINE    
We tested seven hypotheses regarding the mechanisms by which fluctuating asymmetry (FA) originates. We did this by analyzing data on four bilateral characters measured repeatedly during the development of individual domestic fowl. Immediately posthatching, there was substantial directional asymmetry, which rapidly decreased. We detected FA at significant levels in all characters in the majority of our measurements over the remainder of development. We also examined the effects of known environmental stressors (food and density stress) on levels of FA. At the levels we examined, changes in these stressors did not alter the degree of asymmetry we found in fowl. Time series of asymmetry for individuals did not exhibit regular oscillations, as much of the relevant literature predicts. Asymmetry levels reflected the combined effects of developmental noise, which was random in degree and direction, and feedback processes, which decreased asymmetry by altering growth rates on both sides of the body. Our findings best fit the predictions of the residual asymmetry and compensatory growth hypotheses, which suggest that levels of asymmetry reflect only recent growth history.
James R Kellner; Ross A Alford
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-06-10
Journal Detail:
Title:  The American naturalist     Volume:  161     ISSN:  0003-0147     ISO Abbreviation:  Am. Nat.     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-07-14     Completed Date:  2003-09-09     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2984688R     Medline TA:  Am Nat     Country:  United States    
Other Details:
Languages:  eng     Pagination:  931-47     Citation Subset:  IM    
School of Tropical Biology, James Cook University, Townsville, Queensland 4811, Australia.
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MeSH Terms
Chickens / anatomy & histology,  growth & development
Food Deprivation
Functional Laterality
Genetic Variation*
Genetics, Population*
Models, Theoretical*
Population Dynamics

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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