%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES
%A Moreira, L.C.
%A Odinetz Collart, Olga
%T Migraçao vertical nictemeral das larvas de Macrobrachium amazonicum num lago de varzea na Amazonia central, Ilha do Careiro, Brasil
%D 1993
%L fdi:40802
%G POR
%J Amazoniana
%@ 0065-6755
%K MILIEU LACUSTRE ; PLAINE INONDABLE ; CREVETTE ; LARVE ; DISTRIBUTION SPATIALE ; MIGRATION VERTICALE ; RYTHME NYCTHEMERAL
%K BRESIL
%K AMAZONIE ; CAREIRO ILE
%N 3/4
%P 385-398
%U https://www.documentation.ird.fr/hor/fdi:40802
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40802.pdf
%V 12
%W Horizon (IRD)
%X 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)
%$ 036EAUCON01