19805160

Source:http://linkedlifedata.com/resource/pubmed/id/19805160

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0032098, umls-concept:C0332120, umls-concept:C0851346, umls-concept:C1880266, umls-concept:C2603343
pubmed:issue	43
pubmed:dateCreated	2009-10-28
pubmed:abstractText	One signature of adaptive radiation is a high level of trait change early during the diversification process and a plateau toward the end of the radiation. Although the study of the tempo of evolution has historically been the domain of paleontologists, recently developed phylogenetic tools allow for the rigorous examination of trait evolution in a tremendous diversity of organisms. Enemy-driven adaptive radiation was a key prediction of Ehrlich and Raven's coevolutionary hypothesis [Ehrlich PR, Raven PH (1964) Evolution 18:586-608], yet has remained largely untested. Here we examine patterns of trait evolution in 51 North American milkweed species (Asclepias), using maximum likelihood methods. We study 7 traits of the milkweeds, ranging from seed size and foliar physiological traits to defense traits (cardenolides, latex, and trichomes) previously shown to impact herbivores, including the monarch butterfly. We compare the fit of simple random-walk models of trait evolution to models that incorporate stabilizing selection (Ornstein-Ulenbeck process), as well as time-varying rates of trait evolution. Early bursts of trait evolution were implicated for 2 traits, while stabilizing selection was implicated for several others. We further modeled the relationship between trait change and species diversification while allowing rates of trait evolution to vary during the radiation. Species-rich lineages underwent a proportionately greater decline in latex and cardenolides relative to species-poor lineages, and the rate of trait change was most rapid early in the radiation. An interpretation of this result is that reduced investment in defensive traits accelerated diversification, and disproportionately so, early in the adaptive radiation of milkweeds.
pubmed:commentsCorrections	http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-10553904, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-11277638, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-12538260, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-12778543, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-12920297, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-15792222, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-16030149, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-16817533, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-16922309, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-16922310, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-18006550, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-18387075, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-18452574, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-18505385, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-18645183, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-18707460, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-18709597, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-18848446, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-19220456, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-19522840, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-3616620, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-5043141, http://linkedlifedata.com/resource/pubmed/commentcorrection/19805160-9163825
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/7505876
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:month	Oct
pubmed:issn	1091-6490
pubmed:author	pubmed-author:AgrawalAnurag AAA, pubmed-author:FishbeinMarkM, pubmed-author:HalitschkeRaykoR, pubmed-author:HastingsAmy PAP, pubmed-author:RaboskyDaniel LDL, pubmed-author:RasmannSergioS
pubmed:issnType	Electronic
pubmed:day	27
pubmed:volume	106
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	18067-72
pubmed:dateRevised	2010-9-27
pubmed:meshHeading	pubmed-meshheading:19805160-Asclepias, pubmed-meshheading:19805160-Genetic Speciation, pubmed-meshheading:19805160-Multifactorial Inheritance, pubmed-meshheading:19805160-Phylogeny, pubmed-meshheading:19805160-Selection, Genetic
pubmed:year	2009
pubmed:articleTitle	Evidence for adaptive radiation from a phylogenetic study of plant defenses.
pubmed:affiliation	Department of Ecology and Evolutionary Biology, Cornell University, Corson Hall, Ithaca, NY 14853-2701, USA.
pubmed:publicationType	Journal Article, Research Support, U.S. Gov't, Non-P.H.S.