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- W2015559368 abstract "An investigation to estimate the seasonal changes in feeding habits in relation to the energy budget of Euphausia crystallorophias was carried out during austral spring and summer 1994/95 in the shelf region of the Lazarev Sea. Within the upper 300 m, concentrations of larvae, juveniles and subadults/adults of E. crystallorophias during December 1994 and January 1995 ranged from 27 to 1689, from 4 to 86 and from 2 to 9 ind. 1000 m−3, respectively. At stations where swarms of adults occurred, average abundances attained levels of 450–689 ind. 1000 m−3. Gut content analysis showed that during December micro- and mesozooplankton were the dominant components of the diet of E. crystallorophias, comprising on average 75% of the total number of identifiable food items. During January, however, the heterotrophic component of the diet decreased sharply and phytoplankton cells accounted for 68% of the total number of food particles. This suggests that E. crystallorophias may exhibit a predominantly carnivorous habit during austral spring. However, at the onset of the spring phytoplankton bloom, this species seems able to switch to a truly omnivorous habit. Pour estimer les changements saisonniers de régime alimentaire d'Euphausia crystallorophias en relation avec son bilan énergétique, une étude a été menée au printemps en en été austral 1994/1995 dans la région de plateau continental de la Mer de Lazarev. Dans les 300 m superficiels, les concentrations de larves, de juvéniles et de sub-adultes/adultes d'E. crystallorophias variaient respectivement de 27 à 1689, de 4 à 86, et de 2 à 9 ind. 1000 m−3. Aux stations où des essaims d'adultes étaient présents, les valeurs moyennes d'abondance atteignaient 450–689 ind. 1000 m−3. L'analyse des tubes digestifs montre qu'en décembre le micro- et le mésozooplancton étaient les composants dominants du régime d'E. crystallorophias, représentant en moyenne 75% du nombre total des constituants alimentaires identifiables. En janvier cependant, la composante hétérotrophe du régime diminuait en revanche fortement et les cellules phytoplanctoniques représentaient 68% du nombre total des particules alimentaires. Ceci suggère qu'E. crystallorophias est susceptible de présenter un comportement principalement carnivore pendant le printemps austral. À l'apparition de la poussée phytoplanctonique printanière, cette espèce semble en revanche capable de passer à un régime omnivore véritable." @default.
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- W2015559368 date "1998-11-01" @default.
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- W2015559368 title "Abundance and trophodynamics of Euphausia crystallorophias in the shelf region of the Lazarev Sea during austral spring and summer" @default.
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