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Zonation of demersal fishes off Anvers Island, Western Antarctic Peninsula

Zonation of demersal fishes off Anvers Island, Western Antarctic Peninsula
Zonation of demersal fishes off Anvers Island, Western Antarctic Peninsula
The Antarctic fish fauna from outer continental shelf/upper slope depths is under-sampled compared to that of the inner shelf, and there are limited quantitative data available on absolute abundance and taxonomic change with depth. A photographic survey of demersal fishes was conducted along a depth-gradient of 400–2099 m on the outer shelf and upper slope west of Anvers Island, Palmer Archipelago. A total of 1490 fishes were identified at least to the family level. Notothenioids composed 52.7% of absolute abundance and non-notothenioids 47.3%. The most abundant families were Nototheniidae (39.4%), followed by Macrouridae (28.9%), Zoarcidae (16.9%), and Channichthyidae (12.1%). The most abundant species were the notothenioids Lepidonotothen squamifrons (30.5%) and Chionobathyscus dewitti (11.7%), and the non-notothenioid Macrourus spp. (29.5%). The absolute abundance of all fishes peaked at 400–599 m. Depths of maximum abundance were 400–599 m for L. squamifrons, 700–1499 m for Macrourus spp., and 900–1499 for C. dewitti. At 700–999 m the abundance shifted from primarily notothenioids to the non-notothenioids Macrourus spp. and zoarcids. Fishes of the outer shelf and upper slope are not provincialized like those of the inner shelf and are circum-Antarctic.
0954-1020
44-50
Amsler, M.O.
f6b077bd-7c01-4e4a-9067-49c713130993
Eastman, J.T.
1a3e0474-3583-42d0-84e1-75c435672c1e
Smith, K.E.
68a4aa4e-be4d-44de-82e6-330d35883d39
McClintock, J.B.
7451ae4c-dfa3-4f20-95d0-bbd949b1fda7
Singh, H.
9661636a-d32e-45e6-b6ae-ddc41026bf8a
Thatje, S.
f1011fe3-1048-40c0-97c1-e93b796e6533
Aronson, R.B.
7ea9275a-0ed5-4622-81e8-bbb78d4997f9
Amsler, M.O.
f6b077bd-7c01-4e4a-9067-49c713130993
Eastman, J.T.
1a3e0474-3583-42d0-84e1-75c435672c1e
Smith, K.E.
68a4aa4e-be4d-44de-82e6-330d35883d39
McClintock, J.B.
7451ae4c-dfa3-4f20-95d0-bbd949b1fda7
Singh, H.
9661636a-d32e-45e6-b6ae-ddc41026bf8a
Thatje, S.
f1011fe3-1048-40c0-97c1-e93b796e6533
Aronson, R.B.
7ea9275a-0ed5-4622-81e8-bbb78d4997f9

Amsler, M.O., Eastman, J.T., Smith, K.E., McClintock, J.B., Singh, H., Thatje, S. and Aronson, R.B. (2016) Zonation of demersal fishes off Anvers Island, Western Antarctic Peninsula. Antarctic Science, 28 (1), 44-50. (doi:10.1017/S0954102015000462).

Record type: Article

Abstract

The Antarctic fish fauna from outer continental shelf/upper slope depths is under-sampled compared to that of the inner shelf, and there are limited quantitative data available on absolute abundance and taxonomic change with depth. A photographic survey of demersal fishes was conducted along a depth-gradient of 400–2099 m on the outer shelf and upper slope west of Anvers Island, Palmer Archipelago. A total of 1490 fishes were identified at least to the family level. Notothenioids composed 52.7% of absolute abundance and non-notothenioids 47.3%. The most abundant families were Nototheniidae (39.4%), followed by Macrouridae (28.9%), Zoarcidae (16.9%), and Channichthyidae (12.1%). The most abundant species were the notothenioids Lepidonotothen squamifrons (30.5%) and Chionobathyscus dewitti (11.7%), and the non-notothenioid Macrourus spp. (29.5%). The absolute abundance of all fishes peaked at 400–599 m. Depths of maximum abundance were 400–599 m for L. squamifrons, 700–1499 m for Macrourus spp., and 900–1499 for C. dewitti. At 700–999 m the abundance shifted from primarily notothenioids to the non-notothenioids Macrourus spp. and zoarcids. Fishes of the outer shelf and upper slope are not provincialized like those of the inner shelf and are circum-Antarctic.

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e-pub ahead of print date: 5 October 2015
Published date: February 2016
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 380894
URI: https://eprints.soton.ac.uk/id/eprint/380894
ISSN: 0954-1020
PURE UUID: 62802023-b159-49f7-a5bb-10b5aa9bc984

Catalogue record

Date deposited: 26 Aug 2015 10:36
Last modified: 26 Oct 2017 16:33

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