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Distribution, abundance and seasonal flux of pteropods in the Sub-Antarctic Zone

Citation

Howard, WR and Roberts, D and Moy, AD and Lindsay, MCM and Hopcroft, RR and Trull, TW and Bray, SG, Distribution, abundance and seasonal flux of pteropods in the Sub-Antarctic Zone, Deep-Sea Research Part 2: Topical Studies in Oceanography, 58, (21-22) pp. 2293-2300. ISSN 0967-0645 (2011) [Refereed Article]


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DOI: doi:10.1016/j.dsr2.2011.05.031

Abstract

Pteropods were identified from epipelagic net and trawl samples in the Sub-Antarctic Zone during the 2007 mid-summer (January 17–February 20) Sub-Antarctic Zone Sensitivity to Environmental Change (SAZ-Sense) voyage, as well as in a moored sediment trap in the same region. Overall pteropod densities during SAZ-Sense were lower than those reported for higher-latitude Southern Ocean waters. The four major contributors to the Sub-Antarctic Zone pteropod community during the SAZ-Sense voyage, Clio pyramidata forma antarctica, Clio recurva, Limacina helicina antarctica and Limacina retroversa australis, accounted for 93% of all pteropods observed. The distribution of the two dominant pteropods collected in the Sub-Antarctic Zone, L. retroversa australis and C. pyramidata forma antarctica, is strongly related to latitude and depth. L. retroversa australis is typical of cold southern (50–54°S) polar waters and C. pyramidata forma antarctica is typical of shallow (top 20 m) Sub-Antarctic Zone waters. A moored sediment trap deployed to 2100 m at 47°S, 141°E in 2003/04 showed the pteropod flux in the Sub-Antarctic Zone had late-Spring and mid-summer peaks. The diversity, abundance and distribution of pteropods collected during SAZ-Sense provide a timely benchmark against which to monitor future changes in SAZ ocean pteropod communities, particularly in light of predictions of declining aragonite saturation in the Southern Ocean by the end of the century.

Item Details

Item Type:Refereed Article
Keywords:sub-Antarctic Zone, Southern Ocean, Thecosomata, Pteropod, Heteropod, ocean acidification
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological Oceanography
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Howard, WR (Associate Professor William Howard)
Author:Roberts, D (Dr Donna Roberts)
Author:Moy, AD (Dr Andrew Moy)
Author:Lindsay, MCM (Ms Margaret Lindsay)
Author:Trull, TW (Professor Thomas Trull)
Author:Bray, SG (Mr Stephen Bray)
ID Code:70542
Year Published:2011
Web of Science® Times Cited:16
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2011-06-28
Last Modified:2017-10-31
Downloads:0

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