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Distribution, population structure, reproduction and diet of Ophiolimna antarctica (Lyman, 1879) from Kemp Caldera in the Southern Ocean

Distribution, population structure, reproduction and diet of Ophiolimna antarctica (Lyman, 1879) from Kemp Caldera in the Southern Ocean
Distribution, population structure, reproduction and diet of Ophiolimna antarctica (Lyman, 1879) from Kemp Caldera in the Southern Ocean
A new population of Ophiolimna antarctica (Lyman, 1879) was discovered at 1546 m in Kemp Caldera, a topographic feature with active hydrothermal venting at the southern end of the South Sandwich Islands, Southern Ocean. The distribution, population structure, reproduction, and diet of O. antarctica were investigated. O. antarctica were found predominantly on basalt with an over-dispersed distribution. The mean density was 17 individuals m?2 with a range of 9–24 individuals m?2. There was a bimodal population structure, with separate juvenile and adult peaks. Sexes were separate and the sex ratio was not significantly different from equality. The maximum oocyte diameter was 520 ?m, suggesting direct or lecithotrophic development, whilst individual females reproduced asynchronously. Stomach contents included crustacean fragments, flocculate material, diatoms, forams, fish scales, and ophiuroid tissues and spines, which was indicative of omnivory. There was no apparent influence of hydrothermal vents <500 m away on the diet of Ophiolimna antarctica. The ecology of Ophiolimna antarctica is consistent with what is known for other Antarctic and deep-sea ophiuroid species.
Deep sea, Ophiuroid, Antarctic, Reproduction, Diet, Distribution
0967-0645
27-35
Boschen, Rachel E.
2c8810b7-441e-41e1-9d8e-6b71cfe432dc
Tyler, Paul A.
d1965388-38cc-4c1d-9217-d59dba4dd7f8
Copley, Jonathan T.
5f30e2a6-76c1-4150-9a42-dcfb8f5788ef
Boschen, Rachel E.
2c8810b7-441e-41e1-9d8e-6b71cfe432dc
Tyler, Paul A.
d1965388-38cc-4c1d-9217-d59dba4dd7f8
Copley, Jonathan T.
5f30e2a6-76c1-4150-9a42-dcfb8f5788ef

Boschen, Rachel E., Tyler, Paul A. and Copley, Jonathan T. (2013) Distribution, population structure, reproduction and diet of Ophiolimna antarctica (Lyman, 1879) from Kemp Caldera in the Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography, 92, pp. 27-35. (doi:10.1016/j.dsr2.2013.02.005).

Record type: Article

Abstract

A new population of Ophiolimna antarctica (Lyman, 1879) was discovered at 1546 m in Kemp Caldera, a topographic feature with active hydrothermal venting at the southern end of the South Sandwich Islands, Southern Ocean. The distribution, population structure, reproduction, and diet of O. antarctica were investigated. O. antarctica were found predominantly on basalt with an over-dispersed distribution. The mean density was 17 individuals m?2 with a range of 9–24 individuals m?2. There was a bimodal population structure, with separate juvenile and adult peaks. Sexes were separate and the sex ratio was not significantly different from equality. The maximum oocyte diameter was 520 ?m, suggesting direct or lecithotrophic development, whilst individual females reproduced asynchronously. Stomach contents included crustacean fragments, flocculate material, diatoms, forams, fish scales, and ophiuroid tissues and spines, which was indicative of omnivory. There was no apparent influence of hydrothermal vents <500 m away on the diet of Ophiolimna antarctica. The ecology of Ophiolimna antarctica is consistent with what is known for other Antarctic and deep-sea ophiuroid species.

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Published date: August 2013
Keywords: Deep sea, Ophiuroid, Antarctic, Reproduction, Diet, Distribution
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 354203
URI: http://eprints.soton.ac.uk/id/eprint/354203
ISSN: 0967-0645
PURE UUID: 6659d7ed-718b-478c-b569-e73983b66a42

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Date deposited: 03 Jul 2013 15:40
Last modified: 18 Jul 2017 03:58

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Author: Rachel E. Boschen
Author: Paul A. Tyler

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