Abstract:
:It has often been argued that evolutionary diversification is the result of divergent natural selection for specialization on alternative resources. I provide a comprehensive review of experiments that examine the ecology and genetics of resource specialization and adaptive radiation in microbial microcosms. In these experiments, resource heterogeneity generates divergent selection for specialization on alternative resources. At a molecular level, the evolution of specialization is generally attributable to mutations that de-regulate the expression of existing biosynthetic and catabolic pathways. Trade-offs are associated with the evolution of resource specialization, but these trade-offs are often not the result of antagonistic pleiotropy. Replicate adaptive radiations result in the evolution of a similar assemblage of specialists, but the genetic basis of specialization differs in replicate radiations. The implications of microbial selection experiments for evolutionary theory are discussed and future directions of research are proposed.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
MacLean RCdoi
10.1111/j.1420-9101.2005.00931.xkeywords:
subject
Has Abstractpub_date
2005-11-01 00:00:00pages
1376-86issue
6eissn
1010-061Xissn
1420-9101pii
JEB931journal_volume
18pub_type
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