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- Title
Metabolism and body composition of two euphausiids ( Euphausia superba and E. crystallorophias) collected from under the pack-ice off Enderby Land, Antarctica.
- Authors
Ikeda, T.; Kirkwood, R.
- Abstract
Oxygen consumption, ammonia excretion and phosphate excretion rates were measured for Euphausia superba and E. crystallorophias captured under the pack-ice off Enderby Land, Antarctica, during November 1985. Water, ash, carbon, nitrogen and phosphorus composition were also determined. Compared with summer data, body composition of E. superba at this time of year was characterized by low carbon (40.2 to 40.7% of total dry wt), high nitrogen (11.8 to 12.0%), high phosphorus (1.2%) and high water (80.6 to 81.7% of total wet wt) content. Metabolic rates, expressed as percentage daily losses of body carbon, nitrogen and phosphorus were 1.3 to 1.6%, 0.38 to 0.42% and 1.9 to 2.2%, respectively; these fall within the ranges of summer data. E. superba fed on algae growing on the bottom of the ice, but body compositional features of this species suggest limited contribution of ice-algae to nutrition. Compared to E. superba, E. crystallorophias displayed greater metabolic rates and much higher body carbon content (40.9 to 45.0%), implying that feeding conditions under the ice were better suited to the requirements of E. crystallorophias. The only gravid females found belonged to E. crystallorophias.
- Subjects
ENDERBY Land (Antarctica); ANTARCTICA; METABOLISM; EUPHAUSIA superba; EXCRETION; AMMONIA
- Publication
Marine Biology, 1989, Vol 100, Issue 3, p301
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/BF00391143