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    Estimation of phylogenetic divergence times in Panagrolaimidae and other nematodes using relaxed molecular clocks calibrated with insect and crustacean fossils


    McGill, Lorraine M. and Fitzpatrick, David A. and Pisani, Davide and Burnell, Ann (2017) Estimation of phylogenetic divergence times in Panagrolaimidae and other nematodes using relaxed molecular clocks calibrated with insect and crustacean fossils. Nematology, 19 (8). pp. 899-913. ISSN 1568-5411

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    Abstract

    This study presents the use of relaxed molecular clock methods to infer the dates of divergence between Panagrolaimus species. Autocorrelated relaxed tree methods, combined with well characterised fossil calibration dates, yield estimates of nematode divergence dates in accordance with the palaeontological age of fossil ascarid eggs and with the previously estimated date of 18 Ma (range 11.6 to 29.9 Ma) for the divergence of the Caenorhabditis lineage. Our data indicate that Panagrolaimus davidi from Antarctica separated ca 21.98 Ma from its currently known, most closely related strain. Thus, P. davidi may have existed in Antarctica prior to the Last Glacial Maximum, although this seems unlikely as it shares physiological and life history traits with closely related nematodes from temperate climates. These traits may have facilitated colonisation of Antarctica by P. davidi after the quaternary glaciation, analogous to the colonisation of Surtsey Island, Iceland, by P. superbus after its volcanic formation. This study demonstrates that autocorrelated relaxed tree methods combined with well characterised fossil calibration dates may be used as a method to estimate the divergence dates within nematodes in order to gain insight into their evolutionary history.

    Item Type: Article
    Additional Information: Cite as: McGill, L. M., Fitzpatrick, D. A., Pisani, D., & Burnell, A. M. (2017). Estimation of phylogenetic divergence times in Panagrolaimidae and other nematodes using relaxed molecular clocks calibrated with insect and crustacean fossils, Nematology, 19(8), 899-913. doi: https://doi.org/10.1163/15685411-00003096
    Keywords: 18S rDNA SSU; 28S rDNA; Antarctica; Bayesian methods; CIR process; Crustacea; divergence dates; evolutionary history; Insecta; Nematoda evolution; palaeoendemism; Panagrolaimus; Panagrolaimus davidi; Panagrolaimus superbus; Phylobayes; phylogeny; relaxed tree methods; Surtsey Island;
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 11066
    Identification Number: https://doi.org/10.1163/15685411-00003096
    Depositing User: David Fitzpatrick
    Date Deposited: 20 Sep 2019 13:45
    Journal or Publication Title: Nematology
    Publisher: Brill Academic Publishers
    Refereed: Yes
    Funders: Science Foundation Ireland (SFI)
    URI:

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