VillarrealCusimanoRenner2015

Référence

Villarreal, J.C., Cusimano, N. and Renner, S.S. (2015) Biogeography and diversification rates in hornworts: The limitations of diversification modeling. Taxon, 64(2):229-238.

Résumé

Hornworts comprise ca. 220 species and are among the oldest landplant lineages, even though their precise phylogenetic position remains unclear. Deep within-hornwort divergences, highly uneven species numbers per genus, and the assumed high stem age together suggest a history of changing diversification (i.e., speciation minus extinction) rates. To study the geographic distribution of modern hornworts and their patterns of species accumulation, we generated a mitochondrial and plastid DNA matrix for 103 species representing all major groups and then applied molecular-clock dating, using a different calibration approach than in earlier work. We used the BAMM software to fit rate-variable and constant-rate birth-death diversification models to the dataset, and we also inferred ancestral areas to a time depth of 55 Ma (Early Eocene). We analyzed diversification rates for all hornworts and separately for species-rich subclades. Under BAMM's variable-rates model (which fits the data better than a constant-rate birth-death model, but still assumes that each species has the same speciation and extinction probability regardless of its age), hornworts have gradually increasing rates of speciation and a constant background extinction rate. No shifts in diversification rate could be detected. The implausible finding of a constant background extinction rate illustrates the limitations of diversification modeling especially as regards extinction rates.

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@ARTICLE { VillarrealCusimanoRenner2015,
    AUTHOR = { Villarreal, J.C. and Cusimano, N. and Renner, S.S. },
    TITLE = { Biogeography and diversification rates in hornworts: The limitations of diversification modeling },
    JOURNAL = { Taxon },
    YEAR = { 2015 },
    VOLUME = { 64 },
    NUMBER = { 2 },
    PAGES = { 229-238 },
    MONTH = { may },
    ISSN = { 0040-0262 },
    ABSTRACT = { Hornworts comprise ca. 220 species and are among the oldest landplant lineages, even though their precise phylogenetic position remains unclear. Deep within-hornwort divergences, highly uneven species numbers per genus, and the assumed high stem age together suggest a history of changing diversification (i.e., speciation minus extinction) rates. To study the geographic distribution of modern hornworts and their patterns of species accumulation, we generated a mitochondrial and plastid DNA matrix for 103 species representing all major groups and then applied molecular-clock dating, using a different calibration approach than in earlier work. We used the BAMM software to fit rate-variable and constant-rate birth-death diversification models to the dataset, and we also inferred ancestral areas to a time depth of 55 Ma (Early Eocene). We analyzed diversification rates for all hornworts and separately for species-rich subclades. Under BAMM's variable-rates model (which fits the data better than a constant-rate birth-death model, but still assumes that each species has the same speciation and extinction probability regardless of its age), hornworts have gradually increasing rates of speciation and a constant background extinction rate. No shifts in diversification rate could be detected. The implausible finding of a constant background extinction rate illustrates the limitations of diversification modeling especially as regards extinction rates. },
    DOI = { 10.12705/642.7 },
    EISSN = { 1996-8175 },
    ORCID-NUMBERS = { Villarreal A., Juan Carlos/0000-0002-0770-1446 },
    RESEARCHERID-NUMBERS = { Villarreal A., Juan Carlos/C-6277-2018 Cusimano, Natalie/N-9591-2015 },
    UNIQUE-ID = { ISI:000354372300003 },
}

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