Distribution of macrozooplankton at time series station MIGZOO-4, supplement to: Andersen, Valérie; Sardou, Jacques (1994): Pyrosoma atlanticum (Tunicata, Thaliacea): diel migration and vertical distribution as a function of colony size. Journal of Plankton Research, 16(4), 337-349

Valérie Andersen & Jacques Sardou
A large population of the colonial pelagic tunicate Pyrosoma atlanticum occurred in April 1991 in offshore waters of the Ligurian Sea (Northwestern Mediterranean). The high numbers of colonies caught allowed their vertical distribution and diel migration in the 0-965 m water column to be described as a function of their size. Daytime depths and amplitudes of the migration were correlated with colony size. The amplitude of the migration ranged from 90 m for 3-mm-length colonies...
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