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Abundance and trophodynamics of Euphausia crystallorophias in the shelf region of the Lazarev Sea during austral spring and summer
Pakhomov, E.A.; Perissinotto, R.; Froneman, P.W. (1998). Abundance and trophodynamics of Euphausia crystallorophias in the shelf region of the Lazarev Sea during austral spring and summer, in: Le Fèvre, J. et al. (Ed.) Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4): pp. 313-324. hdl.handle.net/10.1016/S0924-7963(98)00046-3
In: Le Fèvre, J.; Tréguer, P. (Ed.) (1998). Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4). Elsevier: Amsterdam. 1-619 pp., more
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963, more
Peer reviewed article  

Also published as
  • Pakhomov, E.A.; Perissinotto, R.; Froneman, P.W. (1998). Abundance and trophodynamics of Euphausia crystallorophias in the shelf region of the Lazarev Sea during austral spring and summer. J. Mar. Syst. 17(1-4): 313-324. hdl.handle.net/10.1016/S0924-7963(98)00046-3, more

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Keywords
    Continental shelves; Energy budget; Feeding behaviour; Marine crustaceans; Ontogeny; Seasonal variations; Spring; Stomach content; Summer; Trophodynamic cycle; Euphausia crystallorophias Holt & Tattersall, 1906 [WoRMS]; Euphausiacea [WoRMS]; PSW, Lazarev Sea; Marine

Authors  Top 
  • Pakhomov, E.A.
  • Perissinotto, R.
  • Froneman, P.W.

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.

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