Document Detail

Not just vicariance: phylogeography of a Sonoran Desert euphorb indicates a major role of range expansion along the Baja peninsula.
MedLine Citation:
PMID:  19302467     Owner:  NLM     Status:  MEDLINE    
To examine the generality of population-level impacts of ancient vicariance identified for numerous arid-adapted animal taxa along the Baja peninsula, we tested phylogeographical hypotheses in a similarly distributed desert plant, Euphorbia lomelii (Euphorbiaceae). In light of fossil data indicating marked changes in the distributions of Baja floristic assemblages throughout the Holocene and earlier, we also examined evidence for range expansion over more recent temporal scales. Two classes of complementary analytical approaches - hypothesis-testing and hypothesis-generating - were used to exploit phylogeographical signal from chloroplast DNA sequence data and genotypic data from six codominant nuclear intron markers. Sequence data are consistent with a scenario of mid-peninsular vicariance originating c. 1 million years ago (Ma). Alternative vicariance scenarios representing earlier splitting events inferred for some animals (e.g. Isthmus of La Paz inundation, c. 3 Ma; Sea of Cortez formation, c. 5 Ma) were rejected. Nested clade phylogeographical analysis corroborated coalescent simulation-based inferences. Nuclear markers broadened the temporal spectrum over which phylogeographical scenarios could be addressed, and provided strong evidence for recent range expansions along the north-south axis of the Baja peninsula. In contrast to previous plant studies in this region, however, the expansions do not appear to have been in a strictly northward direction. These findings contribute to a growing appreciation of the complexity of organismal responses to past climatic and geological changes - even when taxa have evolved in the same landscape context.
R C Garrick; J D Nason; C A Meadows; R J Dyer
Related Documents :
22220517 - On the sensitivity analysis of the iim: a rejoinder.
12046297 - History, development and characteristics of lake ecological models.
20702027 - Comparing forest fragmentation and its drivers in china and the usa with globcover v2.2.
16417127 - Pharmaceuticals in the environment in italy: causes, occurrence, effects and control.
19834897 - The psi semantic validator: a framework to check miape compliance of proteomics data.
8668687 - Interspecies scaling of bosentan, a new endothelin receptor antagonist and integration ...
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-03-19
Journal Detail:
Title:  Molecular ecology     Volume:  18     ISSN:  1365-294X     ISO Abbreviation:  Mol. Ecol.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-05-07     Completed Date:  2009-05-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9214478     Medline TA:  Mol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1916-31     Citation Subset:  IM    
Department of Biology, Virginia Commonwealth University, Richmond, Virginia 23284, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
DNA, Chloroplast / genetics
DNA, Plant / genetics
Desert Climate*
Euphorbia / genetics*
Evolution, Molecular*
Genetic Markers
Genetics, Population
Models, Genetic
Population Dynamics
Sequence Analysis, DNA
Reg. No./Substance:
0/DNA, Chloroplast; 0/DNA, Plant; 0/Genetic Markers

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

Previous Document:  Perspectives and challenges in landscape genetics.
Next Document:  Diversity despite dispersal: colonization history and phylogeography of Hawaiian crab spiders inferr...