Abstract：
BACKGROUND:The rate of nucleotide substitutions is not constant across the Tree of Life, and departures from a molecular clock have been commonly reported. Within parmelioid lichens, the largest group of macrolichens, large discrepancies in branch lengths between clades were found in previous studies. Using an extended taxon sampling, we test for presence of significant rate discrepancies within and between these clades and test our a priori hypothesis that such rate discrepancies may be explained by shifts in moisture regime or other environmental conditions. RESULTS:In this paper, the first statistical evidence for accelerated evolutionary rate in lichenized ascomycetes is presented. Our results give clear evidence for a faster rate of evolution in two Hypotrachyna clades that includes species occurring in tropical and oceanic habitats in comparison with clades consisting of species occurring in semi-arid and temperate habitats. Further we explore potential links between evolutionary rates and shifts in habitat by comparing alternative Ornstein-Uhlenbeck models. CONCLUSION:Although there was only weak support for a shift at the base of a second tropical clade, where the observed nucleotide substitution rate is high, overall support for a shift in environmental conditions at cladogenesis is very strong. This suggests that speciation in some lichen clades has proceeded by dispersal into a novel environment, followed by radiation within that environment. We found moderate support for a shift in moisture regime at the base of one tropical clade and a clade occurring in semi-arid regions and a shift in minimum temperature at the base of a boreal-temperate clade.
journal_name
BMC Evol Bioljournal_title
BMC evolutionary biologyauthors
Lumbsch HT,Hipp AL,Divakar PK,Blanco O,Crespo Adoi
10.1186/1471-2148-8-257subject
Has Abstractpub_date
2008-09-22 00:00:00pages
257issn
1471-2148pii
1471-2148-8-257journal_volume
8pub_type
杂志文章abstract：BACKGROUND:The entire evolutionary history of life can be studied using myriad sequences generated by genomic research. This includes the appearance of the first cells and of superkingdoms Archaea, Bacteria, and Eukarya. However, the use of molecular sequence information for deep phylogenetic analyses is limited by mut...
journal_title：BMC evolutionary biology
pub_type： 杂志文章
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journal_title：BMC evolutionary biology
pub_type： 杂志文章
doi：10.1186/1471-2148-14-118
更新日期：2014-06-02 00:00:00
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journal_title：BMC evolutionary biology
pub_type： 杂志文章
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更新日期：2009-02-18 00:00:00
abstract：BACKGROUND:A single measles vaccination provides lifelong protection. No antigenic variants that escape immunity have been observed. By contrast, influenza continually evolves new antigenic variants, and the vaccine has to be updated frequently with new strains. Both measles and influenza are RNA viruses with high muta...
journal_title：BMC evolutionary biology
pub_type： 杂志文章
doi：10.1186/1471-2148-7-229
更新日期：2007-11-15 00:00:00
abstract：BACKGROUND:Symbioses between invertebrates and prokaryotes are biological systems of particular interest in order to study the evolution of mutualism. The symbioses between the entomopathogenic nematodes Steinernema and their bacterial symbiont Xenorhabdus are very tractable model systems. Previous studies demonstrated...
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更新日期：2006-09-05 00:00:00
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更新日期：2008-05-16 00:00:00
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pub_type： 杂志文章
doi：10.1186/s12862-015-0362-9
更新日期：2015-06-11 00:00:00
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doi：10.1186/1471-2148-13-77
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journal_title：BMC evolutionary biology
pub_type： 杂志文章
doi：10.1186/1471-2148-7-108
更新日期：2007-07-03 00:00:00
abstract：BACKGROUND:Disparity in the timing of biological events occurs across a variety of systems, yet the understanding of genetic basis underlying diverse phenologies remains limited. Variation in maturation timing occurs in steelhead trout, which has been associated with greb1L, an oestrogen target gene. Previous technique...
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更新日期：2018-09-15 00:00:00
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更新日期：2010-12-09 00:00:00
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更新日期：2009-08-20 00:00:00
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pub_type： 杂志文章
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更新日期：2011-01-26 00:00:00
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doi：10.1186/s12862-017-0976-1
更新日期：2017-06-05 00:00:00
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doi：10.1186/1471-2148-10-251
更新日期：2010-08-17 00:00:00
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journal_title：BMC evolutionary biology
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更新日期：2017-08-29 00:00:00
abstract：BACKGROUND:Polyplacophora, or chitons, have long fascinated malacologists for their distinct and rather conserved morphology and lifestyle compared to other mollusk classes. However, key aspects of their phylogeny and evolution remain unclear due to the few morphological, molecular, or combined phylogenetic analyses, p...
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pub_type： 杂志文章
doi：10.1186/s12862-019-1573-2
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pub_type： 杂志文章
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更新日期：2011-11-29 00:00:00
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pub_type： 杂志文章
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更新日期：2014-09-25 00:00:00
