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Impact of marine vertebrates on Antarctic terrestrial micro-arthropods

Part of: Antarctic Science International Bursary collection: Biosciences

Published online by Cambridge University Press:  03 February 2016

Stef Bokhorst  and
Peter Convey
Stef Bokhorst*
Affiliation:
Norwegian Institute for Nature Research (NINA) Department of Arctic Ecology, Tromsø NO 9296, Norway Department of Systems Ecology, Institute of Ecological Science, VU University Amsterdam, De Boelelaan 1085, NL 1081 HV Amsterdam, The Netherlands
Peter Convey
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK National Antarctic Research Centre, University Malaya, B303, Level 3, Block B, Lembah Pantai, 50603 Kuala Lumpur, Malaysia
*
[email protected]
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Abstract

Traits of primary producers associated with tissue quality are commonly assumed to have strong control over higher trophic levels. However, this view is largely based on studies of vascular plants, and cryptogamic vegetation has received far less attention. In this study natural gradients in nutrient concentrations in cryptogams associated with the proximity of penguin colonies on a Maritime Antarctic island were utilized to quantify the impact of nitrogen content on micro-arthropod communities. Proximity to penguin colonies increased the nitrogen concentration of cryptogams, and the penguin source was confirmed by decreasing δ15N values at greater distances from colonies. Micro-arthropod abundance, diversity (H’) and richness declined with distance from the penguin colonies, and was positively correlated with the nitrogen concentrations of cryptogams. Δ15N of micro-arthropods was positively correlated (r2=0.865, P<0.01) with δ15N of the moss Andreaea depressinervis indicating that penguin-derived nitrogen moves through Antarctic food webs across multiple trophic levels. Nitrogen content of cryptogams was correlated with associated micro-arthropods indicating that biotic interactions affect community development in Antarctic terrestrial ecosystems. The spatial patterns of Antarctic biodiversity can therefore be affected by local factors, such as marine vertebrates, beyond existing latitudinal patterns of temperature and water availability.

Keywords

AcariCollembolaisotopelichenmossnitrogen
Type
Biological Sciences
Information
Antarctic Science , Volume 28 , Issue 3 , June 2016 , pp. 175 - 186
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Copyright
© Antarctic Science Ltd 2016 

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