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Strength in numbers: High phenotypic variance in early Cambrian trilobites and its evolutionary implications
Author(s) -
Hughes Nigel C.
Publication year - 2007
Publication title -
bioessays
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.175
H-Index - 184
eISSN - 1521-1878
pISSN - 0265-9247
DOI - 10.1002/bies.20674
Subject(s) - intraspecific competition , biology , evolutionary biology , fossil record , parallel evolution , phylogenetics , microevolution , clade , paleontology , zoology , ecology , gene , genetics , demography , sociology , population
Analysis of the degree of intraspecific morphological polymorphism during the evolutionary history of trilobites using an informatic approach1 provides striking evidence of a long‐suspected but previously unsubstantiated pattern: degrees of polymorphism are markedly higher in phylogenetically basal, stratigraphically early species. This unequivocal pattern prompts further exploration of the relationship between microevolutionary variance and macroevolutionary history. It demonstrates that the ‘traditional’ fossil record of skeletonized organisms can provide unique insight into questions of major evolutionary interest. BioEssays 29:1081–1084, 2007. © 2007 Wiley Periodicals, Inc.