Zonation of demersal fishes off Anvers Island, western Antarctic Peninsula

Academic Article

Abstract

  • © 2015 Antarctic Science Ltd. 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.
  • Published In

  • Antarctic Science  Journal
  • Digital Object Identifier (doi)

    Author List

  • Amsler MO; Eastman JT; Smith KE; McClintock JB; Singh H; Thatje S; Aronson RB
  • Start Page

  • 44
  • End Page

  • 50
  • Volume

  • 28
  • Issue

  • 1