On the basis of hydroacoustic observations it is shown that migrations of krill during spring are stronger than during summer. Migrations of krill are described by the function: H(t) = A + Bcos((2ᴨt/T + φ ) + C c o s ( 2 ᴨt/T + φ ), where: H is depth of the mass center of krill biomass, A — mean depth of krill occurrence, В — amplitude of migrations with period T! = 24 h, С — amplitude of migrations with period T2 = 12 h, (φ1, φ2 — phases of migration process with T, = 24 and T2 = 12 hours. Parameters of the equation are the following: spring — A = 62.2 m, В = 19.5 m, С = 4.6 m, φ1 = 0.1 h, φ2 = 0 . 1 5 h; summer — A = 75.8 m, В = 0.5 m, С = 3.6 m, φ1 = 1.8 h, φ2 = 6.4 h.

JO - Polish Polar Research L1 - http://rhis.czasopisma.pan.pl/Content/111281/PDF/1988_2-3_349-356.pdf L2 - http://rhis.czasopisma.pan.pl/Content/111281 IS - No 2-3 EP - 356 KW - Antarctica KW - krill KW - migrations KW - BIOMASS III ER - A1 - Klusek, Zygmunt A1 - Godlewska, MaĹ‚gorzata PB - Polish Academy of Sciences PB - Committee on Polar Research VL - vol. 9 JF - Polish Polar Research SP - 349 T1 - Depth distribution and day-night migrations of krill (BIOMASS III, Octoberâ€”November 1986, January 1987) UR - http://rhis.czasopisma.pan.pl/dlibra/docmetadata?id=111281