nerc.ac.uk

Mitochondrial DNA analyses reveal widespread tardigrade diversity in Antarctica

Velasco-Castrillon, Alejandro; McInnes, Sandra J.; Schultz, Mark B.; Arroniz-Crespo, Maria; D'Haese, Cyrille A.; Gibson, John A. E.; Adams, Byron J.; Page, Timothy J.; Austin, Andrew D.; Cooper, Steven J. B.; Stevens, Mark I.. 2015 Mitochondrial DNA analyses reveal widespread tardigrade diversity in Antarctica. Invertebrate Systematics, 29 (6). 578-590. 10.1071/IS14019

Before downloading, please read NORA policies.
[img] Text
Velasco-Castrillon_etal_2015_InvertSyst_Mitochondrial_DNA.pdf - Published Version
Restricted to NORA staff only

Download (1MB) | Request a copy

Abstract/Summary

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 Type: Publication - Article
Digital Object Identifier (DOI): 10.1071/IS14019
Programmes: BAS Programmes > BAS Corporate
ISSN: 1445-5226
Additional Keywords: biodiversity, biogeography, COI gene, cosmopolitan, endemic, OTUs, refugia, species delimitation, Tardigrada
Date made live: 25 Jan 2016 11:53 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/512694

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...