Document Detail

Evolution: how do characters evolve?
MedLine Citation:
PMID:  15543664     Owner:  NLM     Status:  MEDLINE    
Ricklefs claims to show that morphological evolution in birds is associated with speciation events--that is, it is punctuational--by inference from data on only species number, clade age and character variance from a range of passerine clades. He suggests that variance increases in proportion with clade age under gradual change, but in proportion to the logarithm of species number if change is punctuational. Here I show that both clade age and the logarithm of species number independently predict variance under both gradual and punctuational change, rendering Ricklefs' results uninformative about his central hypothesis.
Andy Purvis
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Publication Detail:
Type:  Comment; Journal Article    
Journal Detail:
Title:  Nature     Volume:  432     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-11-12     Completed Date:  2004-12-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  1 p following 165; discussion following 165     Citation Subset:  IM    
Department of Biological Sciences, Imperial College London, Silwood Park Campus, Ascot, Berks SL5 7PY, UK.
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MeSH Terms
Aging / physiology
Genetic Variation / genetics
Longevity / physiology
Models, Biological
Reproducibility of Results
Research Design
Songbirds / anatomy & histology*,  classification,  genetics,  physiology*
Species Specificity
Time Factors
Comment On:
Nature. 2004 Jul 15;430(6997):338-41   [PMID:  15254535 ]

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