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Distribution and diversity of soil microfauna from East Antarctica: assessing the link between biotic and abiotic factors

Citation

Velasco-Castrillon, A and Schultz, MB and Colombo, F and Gibson, JAE and Davies, KA and Austin, AD and Stevens, MI, Distribution and diversity of soil microfauna from East Antarctica: assessing the link between biotic and abiotic factors, PLoS ONE, 9, (1) Article e87529. ISSN 1932-6203 (2014) [Refereed Article]


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Copyright Statement

Copyright 2014 Velasco-Castrillon et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

DOI: doi:10.1371/journal.pone.0087529

Abstract

Terrestrial life in Antarctica has been described as some of the simplest on the planet, and mainly confined to soil microfaunal communities. Studies have suggested that the lack of diversity is due to extreme environmental conditions and thought to be driven by abiotic factors. In this study we investigated soil microfauna composition, abundance, and distribution in East Antarctica, and assessed correlations with soil geochemistry and environmental variables. We examined 109 soil samples from a wide range of ice-free habitats, spanning 2000 km from Framnes Mountains to Bailey Peninsula. Microfauna across all samples were patchily distributed, from complete absence of invertebrates to over 1600 specimens/gram of dry weight of soil (gdw), with highest microfauna abundance observed in samples with visible vegetation. Bdelloid rotifers were on average the most widespread found in 87% of sampled sites and the most abundant (44 specimens/gdw). Tardigrades occurred in 57% of the sampled sites with an abundance of 12 specimens/gdw. Nematodes occurred in 71% of samples with a total abundance of 3 specimens/gdw. Ciliates and mites were rarely found in soil samples, with an average abundance of 1.3 and 0.04 specimens/gdw, respectively. We found that microfaunal composition and abundance were mostly correlated with the soil geochemical parameters; phosphorus, NO3- and salinity, and likely to be the result of soil properties and historic landscape formation and alteration, rather than the geographic region they were sampled from. Studies focusing on Antarctic biodiversity must take into account soil geochemical and environmental factors that influence population and species heterogeneity.

Item Details

Item Type:Refereed Article
Keywords:ciliates, mites, biodiversity, terrestrial
Research Division:Biological Sciences
Research Group:Evolutionary Biology
Research Field:Biogeography and Phylogeography
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Gibson, JAE (Dr John Gibson)
ID Code:88989
Year Published:2014
Web of Science® Times Cited:10
Deposited By:IMAS Research and Education Centre
Deposited On:2014-02-22
Last Modified:2017-11-03
Downloads:398 View Download Statistics

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