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The diel vertical migration pattern of the cladoceran Pleopis polyphemoides (Leuckart, 1859) in a stratified tropical bay

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The vertical distribution of the cladoceran Pleopis polyphemoides was studied in Guanabara Bay, Brazil, by sampling at three depths at three-hour intervals for three days. The water column was stratified during the period, with warm, low salinity water from the inner bay at the surface, and cold, high salinity, deep-ocean water below. Young, adult, sexual, and asexual individuals were counted separately. The results confirmed that all sexes and stages of this species perform a reverse vertical migration and are capable of migrating through a sharp thermocline. The factors controlling the migratory behaviour of P. polyphemoides in Guanabara Bay are discussed.

La répartition verticale du cladocère Pleopis polyphemoides a été étudiée dans la baie de Guanabara, au Brésil. L'échantillonnage a été réalisé à trois profondeurs, à des intervalles de trois heures pendant trois jours. Au cours de cette période, la colonne d'eau est marquée par la présence d'une thermocline séparant les eaux de surface, chaudes et de faible salinité, des eaux sous-jacentes, froides, profondes et à forte salinité. Les individus jeunes, adultes, sexués et asexués ont été comptés séparément. Les résultats ont confirmé que tous les stades et sexes de l'espèce réalisent une migration verticale inversée, et sont capables de migrer à travers la thermocline. Les facteurs contrôlant le comportement migratoire de P. polyphemoides dans la baie de Guanabara sont discutés.


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