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Biogeography of Circum-Antarctic springtails.

Citation

McGraughran, A and Stevens, M and Holland, BR, Biogeography of Circum-Antarctic springtails. , Molecular Phylogenetics and Evolution, 57, (1) pp. 48-58. ISSN 1055-7903 (2010) [Refereed Article]


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DOI: doi:10.1016/j.ympev.2010.06.003

Abstract

We examine the effects of isolation over both ancient and contemporary timescales on evolutionary diversification and speciation patterns of springtail species in circum-Antarctica, with special focus on members of the genus Cryptopygus (Collembola, Isotomidae). We employ phylogenetic analysis of mitochondrial DNA (cox1), and ribosomal DNA (18S and 28S) genes in the programmes MrBayes and RAxML. Our aims are twofold: (1) we evaluate existing taxonomy in light of previous work which found dubious taxonomic classification in several taxa based on cox1 analysis; (2) we evaluate the biogeographic origin of our chosen suite of springtail species based on dispersal/ vicariance scenarios, the magnitude of genetic divergence among lineages and the age and accessibility of potential habitat. The dubious taxonomic characterisation of Cryptopygus species highlighted previously is confirmed by our multi-gene phylogenetic analyses. Specifically, according to the current taxonomy, Cryptopygus antarcticus subspecies are not completely monophyletic and neither are Cryptopygus species in general. We show that distribution patterns among species/lineages are both dispersal- and vicariance-driven. Episodes of colonisation appear to have occurred frequently, the routes of which may have followed currents in the Southern Ocean. In several cases, the estimated divergence dates among species correspond well with the timing of terrestrial habitat availability. We conclude that these isotomid springtails have a varied and diverse evolutionary history in the circum- Antarctic that consists of both ancient and recent elements and is reflected in a dynamic contemporary fauna.

Item Details

Item Type:Refereed Article
Keywords:Antarctica, Cryptopygus, Dispersal, Phylogeny, Springtail, Vicariance
Research Division:Biological Sciences
Research Group:Evolutionary Biology
Research Field:Biogeography and Phylogeography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Holland, BR (Associate Professor Barbara Holland)
ID Code:65030
Year Published:2010
Web of Science® Times Cited:13
Deposited By:Mathematics and Physics
Deposited On:2010-09-28
Last Modified:2010-10-26
Downloads:2 View Download Statistics

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