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Timing the eastern Asian-eastern North American floristic disjunction: molecular clock corroborates paleontological estimates.
Mol Phylogenet Evol. 2000 Jun; 15(3):462-72.MP

Abstract

Sequence data of the chloroplast gene rbcL were used to estimate the time of the well-known eastern Asian-eastern North American floristic disjunction. Sequence divergence of rbcL was examined for 22 species of 11 genera (Campsis, Caulophyllum, Cornus, Decumaria, Liriodendron, Menispermum, Mitchella, Pachysandra, Penthorum, Podophyllum, and Phryma) representing a diverse array of flowering plants occurring disjunctly in eastern Asia and eastern North America. Divergence times of putative disjunct species pairs were estimated from synonymous substitutions, using rbcL molecular clocks calibrated for Cornus. Relative rate tests were performed to assess rate constancy of rbcL evolution among lineages. Corrections of estimates of divergence times for each species pair were made based on rate differences of rbcL between Cornus and other species pairs. Results of these analyses indicate that the time of divergence of species pairs examined ranges from 12.56 +/- 4.30 million years to recent (<0.31 million years), with most within the last 10 million years (in the late Miocene and Pliocene). These results suggest that the isolation of most morphologically similar disjunct species in eastern Asia and eastern North America occurred during the global climatic cooling period that took place throughout the late Tertiary and Quaternary. This estimate is closely correlated with paleontological evidence and in agreement with the hypothesis that considers the eastern Asian-eastern North American floristic disjunction to be the result of the range restriction of a once more or less continuously distributed mixed mesophytic forest of the Northern Hemisphere that occurred during the late Tertiary and Quaternary. This implies that in most taxa the disjunction may have resulted from vicariance events. However, long-distance dispersal may explain the disjunct distribution of taxa with low divergence, such as Menispermum.

Authors+Show Affiliations

Department of Biological Sciences, Idaho State University, Pocatello, Idaho, 83209-8007, USA. xianjenn@isu.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

10860654

Citation

Xiang, Q Y., et al. "Timing the Eastern Asian-eastern North American Floristic Disjunction: Molecular Clock Corroborates Paleontological Estimates." Molecular Phylogenetics and Evolution, vol. 15, no. 3, 2000, pp. 462-72.
Xiang QY, Soltis DE, Soltis PS, et al. Timing the eastern Asian-eastern North American floristic disjunction: molecular clock corroborates paleontological estimates. Mol Phylogenet Evol. 2000;15(3):462-72.
Xiang, Q. Y., Soltis, D. E., Soltis, P. S., Manchester, S. R., & Crawford, D. J. (2000). Timing the eastern Asian-eastern North American floristic disjunction: molecular clock corroborates paleontological estimates. Molecular Phylogenetics and Evolution, 15(3), 462-72.
Xiang QY, et al. Timing the Eastern Asian-eastern North American Floristic Disjunction: Molecular Clock Corroborates Paleontological Estimates. Mol Phylogenet Evol. 2000;15(3):462-72. PubMed PMID: 10860654.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Timing the eastern Asian-eastern North American floristic disjunction: molecular clock corroborates paleontological estimates. AU - Xiang,Q Y, AU - Soltis,D E, AU - Soltis,P S, AU - Manchester,S R, AU - Crawford,D J, PY - 2000/6/22/pubmed PY - 2000/8/12/medline PY - 2000/6/22/entrez SP - 462 EP - 72 JF - Molecular phylogenetics and evolution JO - Mol Phylogenet Evol VL - 15 IS - 3 N2 - Sequence data of the chloroplast gene rbcL were used to estimate the time of the well-known eastern Asian-eastern North American floristic disjunction. Sequence divergence of rbcL was examined for 22 species of 11 genera (Campsis, Caulophyllum, Cornus, Decumaria, Liriodendron, Menispermum, Mitchella, Pachysandra, Penthorum, Podophyllum, and Phryma) representing a diverse array of flowering plants occurring disjunctly in eastern Asia and eastern North America. Divergence times of putative disjunct species pairs were estimated from synonymous substitutions, using rbcL molecular clocks calibrated for Cornus. Relative rate tests were performed to assess rate constancy of rbcL evolution among lineages. Corrections of estimates of divergence times for each species pair were made based on rate differences of rbcL between Cornus and other species pairs. Results of these analyses indicate that the time of divergence of species pairs examined ranges from 12.56 +/- 4.30 million years to recent (<0.31 million years), with most within the last 10 million years (in the late Miocene and Pliocene). These results suggest that the isolation of most morphologically similar disjunct species in eastern Asia and eastern North America occurred during the global climatic cooling period that took place throughout the late Tertiary and Quaternary. This estimate is closely correlated with paleontological evidence and in agreement with the hypothesis that considers the eastern Asian-eastern North American floristic disjunction to be the result of the range restriction of a once more or less continuously distributed mixed mesophytic forest of the Northern Hemisphere that occurred during the late Tertiary and Quaternary. This implies that in most taxa the disjunction may have resulted from vicariance events. However, long-distance dispersal may explain the disjunct distribution of taxa with low divergence, such as Menispermum. SN - 1055-7903 UR - https://www.unboundmedicine.com/medline/citation/10860654/Timing_the_eastern_Asian_eastern_North_American_floristic_disjunction:_molecular_clock_corroborates_paleontological_estimates_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1055790300907668 DB - PRIME DP - Unbound Medicine ER -