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The Vertical Migration Behaviour of Two Calanoid Copepods, Acartia Tonsa Dana, 1849 and Paracalanus Parvus (Claus, 1863) in a Stratified Tropical Bay in Brazil

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The diel vertical migration pattern of the copepods, Acartia tonsa and Paracalanus parvus was studied in Guanabara Bay, Brazil. Samples were taken at a fixed station at three depths, at three-hour intervals, and for three days. During the study period, the water column was stratified with warm, low-salinity water from the inner bay at the surface and cold, high-salinity deep-ocean water below. The individuals of both species were identified and counted, with no sex or stage distinction. The results confirmed that A. tonsa and P. parvus have a different migratory behaviour. A. tonsa maintains itself in the surface water layer during the night. This species does not seem to be affected by the presence of a sharp thermocline. P. parvus shows a vertical migration pattern based on a 12-hour cycle and it is limited to deeper waters, below the thermocline. This peculiar behaviour may help P. parvus to avoid being carried into the inner, polluted part of the bay. Le modèle de migration journalière verticale des copépodes Acartia tonsa et Paracalanus parvus a été étudié dans la baie de Guanabara au Brésil. Des échantillons ont été prélevés à une station fixe, à trois profondeurs, toutes les trois heures et pendant trois jours. Au cours de cette période, la colonne d'eau était stratifiée, avec des eaux de surface chaudes et de faible salinité provenant de l'intérieur de la baie et au-dessous, des eaux froides de forte salinité provenant des eaux profondes de l'océan Atlantique. Les individus des deux espèces étudiées ont été identifiés et comptés, sans distinction de stade ou de sexe. Les résultats confirment que A. tonsa et P. parvus ont un comportement migratoire différent. A. tonsa se maintient pendant la nuit dans les eaux de surface. Cette espèce ne semble pas être affectée par la présence d'une forte thermocline. P. parvus présente une migration verticale fondée sur un cycle de 12 heures, et limitée aux eaux plus profondes, au-dessous de la thermocline. Ce comportement particulier peut aider P. parvus à éviter les eaux polluées de l'intérieur de la baie.

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/content/journals/10.1163/1568540042781784
2004-08-01
2015-07-04

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