KRILL DISTRIBUTION IN THE WESTERN ATLANTIC SECTOR OF THE SOUTHERN OCEAN DURING 1983184,1984185 AND 1987188 BASED ON THE RESULTS OF SOVIET MESOSCALE SURVEYS CONDUCTED USING AN ISAACS-KIDD MIDWATER TRAWL

• Main Authors: V. A. Sushin, K. E. Shulgovsky
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; Antarctic Peninsula; Kidd; South Georgia Island; Southern Ocean; The Antarctic; Antarc*
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.465.346; http://www.ccamlr.org/en/system/files/science_journal_papers/05sushin-shulgovsky.pdf

In this paper we consider the results of three mesoscale surveys covering a wide area of krill distribution between the Antarctic Peninsula and South Georgia Island. Surveys including from 158 to 202 stations were carried out by Soviet research vessels in the summer-autumn periods of 1983/84 and 1987/88 and in the spring-summer of 1984/85 using a grid of stations according to the standard method for Isaacs-Kidd midwater trawls operating in the layer 0 to 100 m. Overall krill biomass distribution (g / l 000 m3) and its mean values were analysed by subarea (Subareas 48.1,48.2 and 48.3) and for the whole study area. Survey results confirm current understanding of the general pattern of krill distribution and drift in the western part of the Atlantic sector of the Antarctic (e.g. Priddle et al., 1988; Makarov, 1996). The greatest degree of spatial-temporal stability in the krill distribution field with high biomass of aggregations was observed in the western part of the area stretching from the Antarctic Peninsula to the eastern part of the South Orkneys area. The greatest variability of krill distribution on the spatial-temporal scale of the survey, which is characterised by a change in biomass of