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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. J. Mar. Syst. 17(1-4): 313-324. https://dx.doi.org/10.1016/S0924-7963(98)00046-3
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, more
Also appears 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
Peer reviewed article  
Available in  Authors 
Keywords
    Behaviour > Feeding behaviour
    Biogeny > Ontogeny
    Cycles > Trophodynamic cycle
    Energy budget
    Fauna > Aquatic organisms > Aquatic animals > Shellfish > Marine organisms > Marine crustaceans
    Seasons > Spring
    Seasons > Summer
    Stomach content
    Temporal variations > Periodic variations > Seasonal variations
    Topographic features > Submarine features > Continental shelves
    Euphausia crystallorophias Holt & Tattersall, 1906 [WoRMS]; Euphausiacea [WoRMS]
    PSW, Lazarev Sea
    Marine/Coastal
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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