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• W768942002 abstract "appr The diatom Skeletonema costatum was labeled with zinc-65 and fed to Euphausia pacifica, a macroplanktonic crustacean. Because Skeletonema accumulated different amounts of radiozinc (concentration factors varied between 41 and 7, 209), the amount accumulated by the grazing euphausiids varied according to the equation 0.478 Y = 50. 49X , where Y represented the amount of radiozinc accumulated by the euphausiids (cpm/mg) and X represented the amount contained in the phytoplankton cells (cpm/ 5000 cells). Uptake by the grazing euphausiids also was affected by water temperature and molting of the animal& chitinous exoskeletons. Concentrations of phytoplankton cells, which were at levels much higher than those found in nature, apparently did not affect uptake. No effect of animal size could be detected. determined from zinc-65 accumulation rates was 9. 2 over the range 50 to 15°C. Redacted for Privacy Such a high Q10 indicated that zinc-65 accumulation was not a good indicator of metabOlic activity. The average percent of ingested zinc-65 assimilated into euphauslid tissues during the first hour of feeding was estimated as 58. 6 percent. No estimates could be made for successive time periods because rates of egestion of labeled material were not determined. Rates of elimination of zinc-65 were calculated for feeding and non-feeding euphausi±ds. The loss rate for the feeding euphausuds was highest at 10°C and lowest at 5°C, with the 15°C rate intermediate. The biological half-life of zinc-65 accumulated from the water alone was about 21 percent less than that accumulated from labeled phytoplankton at 10°C. Molting affected zinc-65 elimination greatly, but a lower percentage of the radiozinc was contained in the molts of animals grazing on radioactive food than in those of non-grazing animals. The mechanism of uptake and loss, the effects of injury on zinc-65 uptake, and experimental variation are discussed. UPTAKE AND RETENTION OF ZINC-65 FROM FOOD BY EUPHAUSIA PACIFICA HANSEN" @default.
• W768942002 created "2016-06-24" @default.
• W768942002 creator A5008813654 @default.
• W768942002 date "1967-05-11" @default.
• W768942002 modified "2023-09-26" @default.
• W768942002 title "Uptake and retention of zinc-65 from food by Euphausia pacifica Hansen" @default.
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