Publications des scientifiques de l'IRD

Moreira L.C., Odinetz Collart Olga. (1993). Migraçao vertical nictemeral das larvas de Macrobrachium amazonicum num lago de varzea na Amazonia central, Ilha do Careiro, Brasil. Amazoniana, 12 (3/4), p. 385-398. ISSN 0065-6755.

Titre du document
Migraçao vertical nictemeral das larvas de Macrobrachium amazonicum num lago de varzea na Amazonia central, Ilha do Careiro, Brasil
Année de publication
1993
Type de document
Article
Auteurs
Moreira L.C., Odinetz Collart Olga
Source
Amazoniana, 1993, 12 (3/4), p. 385-398 ISSN 0065-6755
Prawn larvae of Macrobrachium amazonicum have been collected during six diel cycles in the epilimnion (surface and 2 m) from three different habitats of the Lagos do Rei, Careiro Island. The larval distribution showed a significant increase in density at 22 hours regardless of season or habitat, which suggests a diel vertical migration pattern. The thermal stratification of the lake (mean differential of 0.5° between the surface and 2 m and 0.6° between 2 m and 4 m) suggests that this phenomena could be only partly related to a metabolic efficiency resulting from prawns residing at cooler depths during the day. In shallow tropical waters, predation by visually dependant planktivores can be a more important factor in the adaptative significance of the diel distribution of the macrozooplankton than a low thermal stratification. The diurnal feeding activity found in the predominant planktivores fish species of the Careiro lake reinforces this hypothesis. (Résumé d'auteur)
Plan de classement
Dynamique de populations / modélisation [036EAUCON01]
Descripteurs
MILIEU LACUSTRE ; PLAINE INONDABLE ; CREVETTE ; LARVE ; DISTRIBUTION SPATIALE ; MIGRATION VERTICALE ; RYTHME NYCTHEMERAL
Description Géographique
BRESIL
Localisation
Fonds IRD [F B40802] ; Montpellier (Centre IRD)
Identifiant IRD
fdi:40802
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