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Data on abundance stage compos~bon and ve~ t i ca l distnbution sex rat10 rnatunty states and the Inferred seasonal/ontogenetic migrat~ons of Calanoldes acutus, Calanus proplnquus and Rhlncaldnus glgas obtained dunng the Winter Weddell Gyre Study 1992 In early to mid-winter a r e presented Dunng this penod copepodite Stages CIV and CV and adult females of C acutus underwent an ontogenetic downward migration, which In CIV seemed to be delayed until early wlnter if moderate blomass of phytoplankton was sustained in the upper watei layers The descent of CV and CV1 was close to completion already by June w h ~ l e CIV continued to sink down slowly during the w ~ n t e r By mid-wlnter, sexual differentiat~on in CV, maturation of males and the onset of female maturation were observed for C acutus Males of C acutus maintained rather restricted vertical distnbutlon centered in the coie of the Walin Deep Water C proplnquus showed no indicdtion of regular ontogenetic migration but did show some seasonal changes In the vertlcal distnbution of particular stages with a strong geographical variabihty The bulk of the overw~ntenng C proplnquus populat~on m the Weddell Gyre consisted of CIII and did not leave the Wlnter Water The maturation of males and females in C propinquus began in winter as well R g ~ g a s underlvent a downward migration bvh~ch was only detected in those parts of the Weddell Gyre where some recruitment of that species took place I e at the Weddell Front and in the Maud h s e area Although sexual differentiation in CV was in progress in winter the onset of maturation of both males and females in R glgas appeared to be delayed until at least the end of winter K E Y WORDS: Copepods . Antarctica . Migrations . Maturation . Sex ratio

Winter ontogenetic migrations and the onset of gonad development in large dominant calanoid copepods in the Weddell Gyre (Antarctica)