Copepod feeding in a tuna fishery area of the tropical Atlantic Ocean
- 1 February 2002
- journal article
- research article
- Published by Cellule MathDoc/Centre Mersenne in Comptes Rendus Biologies
- Vol. 325 (2), 171-177
- https://doi.org/10.1016/s1631-0691(02)01421-x
Abstract
Biomass, feeding and metabolic rates of planktonic copepods were studied in an oligotrophic area of the tropical Atlantic Ocean during an instability wave period (boreal summer) and a stratified period (boreal winter). In summer, zooplankton biomass was higher than in winter, showing a positive effect of the instability wave. Moreover, feeding equilibrated metabolic expenditures of copepods in most cases during the instability. In contrast, in stratified conditions copepods did not equilibrate their metabolic budget. Our results suggest that the microbial loop was the dominant trophic pathway during both periods but with a quicker cycling during the instability. Biomasse, ingestion et taux métaboliques des copépodes planctoniques ont été étudiés dans une zone oligotrophe de l’Atlantique tropical en période d’onde d’instabilité (été boréal) et en période stratifiée (hiver boréal). En été, la biomasse du zooplancton était plus forte qu’en hiver, montrant un effet positif de l’onde d’instabilité. De plus, l’ingestion a équilibré les dépenses métaboliques des copépodes dans la plupart des cas. En condition stratifiée, au contraire, un déséquilibre métabolique a été mis en évidence. Nos résultats suggèrent que la boucle microbienne a été la voie trophique dominante pendant les deux périodes, mais avec un recyclage plus rapide pendant l’instabilité.Keywords
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