Ecological Studies in the Antarctic Sea Ice Zone: Results of by John S. Gray (auth.), Professor Wolf E. Arntz, Professor

By John S. Gray (auth.), Professor Wolf E. Arntz, Professor Andrew Clarke (eds.)

Until relatively lately, the remoteness, inaccessibility, and severe weather have intended that the huge pack-ice region round the Antarctic continent was once one of many least-known marine ecosystems in the world. Myths and speculations prevailed within the literature, frequently derived from an anthropocentric state of mind that thought of the sea-ice surroundings as predominantly adverse to marine lifestyles. This photo has replaced enormously now because of a sequence of overseas efforts, the latest of which has been the hugely winning EASIZ (Ecology of the Antarctic Sea Ice sector) programme of the medical Council on Antarctic learn (SCAR). Focusing, unlike different foreign programmes, on existence on the seafloor, EASIZ has tried to hyperlink techniques within the 3 significant marine subsystems (sea ice, pelagic and benthic) in the pack-ice sector. paintings has been performed from either learn ships and shore-based examine stations. This paintings incorporated organisms ranging in measurement from micro organism to seals and lined themes as assorted as biodiversity, iceberg scour, pelagobenthic coupling, autecology, and ecophysiology. accordingly, we now view the sea-ice sector as a wealthy approach with hugely tailored organisms, enormous usual disturbance from ice, low resilience and of serious capability significance as a trademark for weather change.

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Extra resources for Ecological Studies in the Antarctic Sea Ice Zone: Results of EASIZ Midterm Symposium

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Indeed, because of confusion in the taxonomy, it has been almost impossible to make the accurate identifications necessary for ecological, physiological and behavioural studies. In addition, research has been concentrated in particular areas of the Southern Ocean: the eastern sector of Antarctica near Prydz Bay, the Antarctic Peninsula and the Scotia Sea. The Scotia Sea is defined as the body of water bounded by the Scotia Ridge and the extension of the Shackleton Fracture Zone to the southern tip of South America (Locarnini et al.

Seven species were captured in the Weddell Sea at 400-600 m depth compared with 11 species off the Antarctic Peninsula. In the deeper band (600-800 m) both curves are similar in shape, suggesting that at 20 Table 3 Numbers of each species of octopodid caught during each of ten trawls with a commercial bottom trawl in the Weddell Sea Depth band 200-400 m 400-600 m Depth of trawl (m) 227-232 242-246 Pareledone charcoti Pareledone sp. A Pareledone sp. B Pareledone turqueti Pareledone sp. C Pareledone polymorpha Megaleledone senoi Benthoctopus cf levis Total number of specimens Trawl duration (mins) 35 8 19 8 6 2 10 16 17 9 6 4 4 2 2 2 3 3 5 8 6 333-338 428-446 457-459 465-468 462-481 574-604 620-640 850-859 33 2 5 8 2 52 5 2 2 2 3 73 47 23 30 12 24 107 6 10 2 6 16 15 15 16 15 16 26 14 15 15 163 10 5 10 I o+-----__~~--~~~~----~~--------~ -I+---------~------~---------+--------~ a 200 - 400 m depth o 400 - 600 m depth o 600 - 800 m depth -2+--------+--------+--------+------~ -I I I Total 98 33 16 63 32 80 14 2 338 I these depths the Weddell Sea and the Antarctic Peninsula may support a similar number of octopodid species, although further survey work is required in the Weddell Sea to verify this.

E. to 1,000 /lm. Two females were observed to brood the Gambi. offspring in the branchial crown. One specimen was Para types (Australian Museum no. W25915): 2 specbearing mature eggs, with a brilliant orange-reddish imens from the same locality and sample of the holotype. colour. The other specimen was brooding larvae (of Other material: 81 specimens from the same locality which we counted 946). Larvae were also a brilliant and sample of the holotype and para types, and 27 orange colour, and ranged from 750 /lm to 1 mm in specimens from station ANT-XV/3 no.

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