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RESPIRATION AND EXCRETION WITHIN A MASS AGGREGATION OF EUPHAUSIA SUPERBA: IMPLICATIONS FOR KRILL DISTRIBUTION

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image of Journal of Crustacean Biology

ABSTRACT The oceanographic environment within a mass aggregation of krill encountered north of Elephant Island in March 1981 was sampled with a submersible pump/CTD combination. Estimates of acoustic biomass made concurrently at 50 kHz were used to infer krill population density. At depths between 50-100 m, differences in dissolved oxygen and ammonium ion between two pumped hydrocasts made within the krill school and two made at adjacent sites but outside the school averaged -0.15 ml oxygen 1-1 and +0.75 μg-atoms NH4+ 1-1. Using previously reported data on the respiration and excretion rates of individual krill, we demonstrate that these differences could have been generated in 16-18 h. From information on the mean velocity of near-surface currents in the vicinity of Elephant Island, we speculate on how population density of krill schools may be constrained in time and space.

Affiliations: 1: (MAJ and DCB) Department of Oceanography, Texas A&M University, College Station, Texas 77843;; 2: (MCM) Northwest and Alaska Fisheries Center, NOAA, Seattle, Washington 98109.

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/content/journals/10.1163/1937240x84x00570
1984-01-01
2016-12-04

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