Effects of iron, manganese, copper, and zinc enrichments on productivity and biomass in the subarctic Pacific

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Coale, K. H. (1991). Effects of iron, manganese, copper, and zinc enrichments on productivity and biomass in the subarctic Pacific. Limnology & Oceanography, 36(8), 1851-1864.
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TitleEffects of iron, manganese, copper, and zinc enrichments on productivity and biomass in the subarctic Pacific
AuthorsK. Coale
AbstractNatural plankton populations from subarctic Pacific surface waters were incubated in 7-d experiments with added concentrations of Fe, Mn, Cu, and Zn. Small additions of metals (0.89 nM Fe, 1.8 nM Mn, 3.9 nM Cu, and 0.75 nM Zn) were used to simulate natural perturbations in metal concentrations potentially experienced by marine plankton. Although the controls indicated little growth, increases in phytoplankton productivity, Chl a, and cell densities were dramatic after addition of 0.89 nM Fe, indicating that it may limit the rates of algal production in these waters. Similar increases were observed in experiments with 3.9 nM Cu added. The Cu effect is attributed to a decrease in the grazing activities of the microzooplankton (ciliates) and increases in the rates of production. Mn enrichment had its greatest effect on diatom biomass, whereas Zn enrichment had its greatest effect on other autofluorescent organisms. Natural systems may be affected as follows: natural levels of Fe and Cu may influence phytoplankton productivity and trophic structure in open-ocean, high-nutrient, low-biomass systems; rates of net production are not limited by one micronutrient alone. -from Author
JournalLimnology & Oceanography
Date1991
Volume36
Issue8
Start page1851
End page1864
ISSN0024-3590
Subjectscopper, iron, manganese, nutrient enrichment, productivity, zinc, Pacific, (North)

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