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Interannual pteropod variability in sediment traps deployed above and below the aragonite saturation horizon in the Sub-Antarctic Southern Ocean

Citation

Roberts, D and Howard, W and Moy, AD and Roberts, JL and Trull, T and Bray, SG and Hopcroft, RR, Interannual pteropod variability in sediment traps deployed above and below the aragonite saturation horizon in the Sub-Antarctic Southern Ocean, Polar Biology, 34, (11) pp. 1739-1750. ISSN 0722-4060 (2011) [Refereed Article]


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Copyright 2011 Springer-Verlag

DOI: doi:10.1007/s00300-011-1024-z

Abstract

Anthropogenic inputs of CO2 are altering ocean chemistry and may alter the role of marine calcifiers in ocean ecosystems. Laboratory research and ocean models suggest calcifiers in polar waters are especially at risk, particularly pteropods: pelagic aragonite-shelled molluscs. However, baseline data for natural populations of pteropods are limited, especially for polar and sub-polar waters. In order to establish baseline data on diversity, preservation state and shell flux of in situ populations of Sub-Antarctic Southern Ocean pteropods, we deployed sediment traps above (1,000 m) and below (2,000 m) the aragonite saturation horizon (ASH) (currently at 1,200 m) from 1997 to 2006 at 47°S, 142°E. We identified seven pteropod taxa. We applied a shell opacity index to each shell collected and found 50% of shells collected above the ASH to be in pristine condition but only 3% of the shells collected below the ASH showed such a high degree of preservation. We estimated pteropod shell mass fluxes for the region (0.17"4.99 mg m−2 day−1), and we identified significant reductions in shell flux for Limacina helicina antarctica forma rangi and Clio recurva to the trap series above the ASH and for Limacina helicina antarctica forma rangi and Limacina helicina antarctica forma antarctica to the trap series below the ASH over the interval 1997"2006. Our data establish a temporal and vertical snapshot of the current Sub-Antarctic pelagic pteropod community and provide a baseline against which to monitor Southern Ocean pteropods responses, if any, to changing ocean conditions projected for the region in the coming decades.

Item Details

Item Type:Refereed Article
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Ecological Impacts of Climate Change
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Ecosystem Adaptation to Climate Change
Author:Roberts, D (Dr Donna Roberts)
Author:Howard, W (Associate Professor William Howard)
Author:Moy, AD (Dr Andrew Moy)
Author:Roberts, JL (Dr Jason Roberts)
Author:Trull, T (Professor Thomas Trull)
Author:Bray, SG (Mr Stephen Bray)
ID Code:70527
Year Published:2011
Web of Science® Times Cited:14
Deposited By:IMAS Research and Education Centre
Deposited On:2011-06-27
Last Modified:2012-05-09
Downloads:0

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