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Mitochondrial DNA analyses reveal widespread tardigrade diversity in Antarctica

Citation

Velasco-Castrillon, A and McInnes, SJ and Schultz, MB and Arroniz-Crespo, M and D'Haese, CA and Gibson, JAE and Adams, BJ and Page, TJ and Austin, AD and Cooper, SJB and Stevens, MI, Mitochondrial DNA analyses reveal widespread tardigrade diversity in Antarctica, Invertebrate Systematics, 29, (6) pp. 578-590. ISSN 1445-5226 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 CSIRO

DOI: doi:10.1071/IS14019

Abstract

Antarctica contains some of the most challenging environmental conditions on the planet due to freezing temperatures, prolonged winters and lack of liquid water. Whereas 99.7% of Antarctica is permanently covered by ice and snow, some coastal areas and mountain ridges have remained ice-free and are able to sustain populations of microinvertebrates. Tardigrades are one of the more dominant groups of microfauna in soil and limno-terrestrial habitats, but little is known of their diversity and distribution across Antarctica. Here, we examine tardigrades sampled from across an extensive region of continental Antarctica, and analyse and compare their partial mitochondrial cytochrome c oxidase subunit 1 (COI) gene sequences with those from the Antarctic Peninsula, maritime and sub-Antarctica, Tierra del Fuego and other worldwide locations in order to recognise operational taxonomic units (OTUs). From 439 new tardigrade COI sequences, we identified 98 unique haplotypes (85 from Antarctica) belonging to Acutuncus, Diphascon, Echiniscus, Macrobiotus, Milnesium and unidentified Parachela. Operational taxonomic units were delimited by Poisson tree processes and general mixed Yule coalescent methods, resulting in 58 and 55 putative species, respectively. Most tardigrades appear to be locally endemic (i.e. restricted to a single geographic region), but some (e.g. Acutuncus antarcticus (Richters, 1904)) are widespread across continental Antarctica. Our molecular results reveal: (i) greater diversity than has previously been appreciated with distinct OTUs that potentially represent undescribed species, and (ii) a lack of connectivity between most OTUs from continental Antarctica and those from other Antarctic geographical zones.

Item Details

Item Type:Refereed Article
Keywords:biodiversity, biogeography, COI gene, cosmopolitan, endemic, OTUs, refugia, species delimitation, Tardigrada
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Gibson, JAE (Dr John Gibson)
ID Code:108705
Year Published:2015
Web of Science® Times Cited:2
Deposited By:IMAS Research and Education Centre
Deposited On:2016-05-04
Last Modified:2017-10-31
Downloads:0

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