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The comatulid crinoid Anthometrina adriani is well represented among the suspension-feeding megaepibenthos from the continental shelf of the Dumont D’Urville Sea, Antarctica. Nearly 500 specimens were sampled during the Collaborative East Antarctic Marine Census expedition onboard the RV ‘Aurora Australis’ (December 2007 to January 2008), from 50 of the 87 stations over a 400 km² area. Abiotic environmental factors were measured and an ocean circulation model was used to generate near-bottom parameters. The ecological niche of A. adriani was described by using ecological-niche factor analysis and Mahalanobis distances factor analysis. An environmental suitability map (ESM) was developed to map the optimal habitat. A. adriani prefers moderately deep and relatively cold waters with moderate current velocity, and a substrate with low gravel content and biogenic carbonate. The ESM shows 4 optimal regions: the eastern side of the George V Basin, the eastern side of the Adélie Basin, the southern part of the Adélie Bank, and the coastal area between the Astrolabe and Mertz glaciers. The ecological niche for A. adriani appears very narrow, but the species is widely distributed across the Antarctic shelf. It suggests that local changes in limiting factors have a strong local effect on the distribution of this species and that a total eradication of this species from the shelf would need an Antarctic-wide and synchronic change in these essential parameters. Modeling modifications in environmental conditions under different climate change scenarios could help predict the effect of such changes on the distribution of this selective species.

Item Type:	Refereed Article
Keywords:	Ecological niche · Optimal habitat · Antarctica · Crinoid · Anthometrina adriani · Ocean circulation model
Research Division:	Biological Sciences
Research Group:	Ecology
Research Field:	Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:	Environment
Objective Group:	Ecosystem Assessment and Management
Objective Field:	Ecosystem Assessment and Management of Antarctic and Sub-Antarctic Environments
UTAS Author:	Galton-Fenzi, B (Dr Ben Galton-Fenzi)
UTAS Author:	Riddle, MJ (Dr Martin Riddle)
UTAS Author:	Rintoul, SR (Dr Steve Rintoul)
ID Code:	76075
Year Published:	2011
Web of Science® Times Cited:	8
Deposited By:	CRC-Antarctic Climate & Ecosystems
Deposited On:	2012-02-27
Last Modified:	2017-10-13
Downloads:	1 View Download Statistics