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History of benthic colonisation beneath the Amery Ice Shelf, East Antarctica

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Post, AL and Hemer, M and O'Brien, PE and Roberts, D and Craven, M (2007) History of benthic colonisation beneath the Amery Ice Shelf, East Antarctica. Marine Ecology Progress Series, 344. pp. 29-37. ISSN 0171-8630

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Abstract

This study presents compelling evidence for a diverse and abundant seabed community
that developed over the course of the Holocene beneath the Amery Ice Shelf, East Antarctica. Fossil
analysis of a 47 cm long sediment core revealed a rich modern fauna dominated by filter feeders
(sponges and bryozoans). The down-core assemblage indicated a succession in the colonisation of
this site. The lower portion of the core (before ~9600 yr BP) was completely devoid of preserved
fauna. The first colonisers (at ~10 200 yr BP) were mobile benthic organisms. Their occurrence was
matched by the first appearance of planktonic taxa, indicating a retreat of the ice shelf following the
last glaciation to within sufficient distance to advect planktonic particles via bottom currents. The
benthic infauna and filter feeders emerged during the peak abundance of the planktonic organisms,
indicating their dependence on the food supply sourced from the open shelf waters of Prydz Bay.
Understanding patterns of species succession in this environment has important implications for
determining the potential significance of future ice shelf collapse.

Item Type: Article
Keywords: Ice shelf · Succession · Holocene · Benthic fauna · Microfossil
Journal or Publication Title: Marine Ecology Progress Series
Publisher: Inter-Research
Page Range: pp. 29-37
ISSN: 0171-8630
Identification Number - DOI: 10.3354/meps06966
Date Deposited: 07 Apr 2008 14:13
Last Modified: 18 Nov 2014 03:33
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