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THE EFFECTS OF IRONAND COPPERAVAILABILITY ON THECOPPER STOICHIOMETRYOF MARINEPHYTOPLANKTON1 Jian GuoSuzanne E. LapiThomas J. Ruth2012 год

THE EFFECTS OF IRON AND COPPER AVAILABILITY ON THE COPPER STOICHIOMETRY OF MARINE PHYTOPLANKTON1
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Аннотация: We studied the interactive effects of iron (Fe) and copper (Cu) availability on the growth rates, Cu quotas, and steady‐state Cu‐uptake rates (ρ ss Cu) of 12 phytoplankton (from four classes and two marine environments). A mixed‐effect statistical model indicated that low Fe significantly decreased phytoplankton growth rates. In contrast, lowering Cu levels only decreased the growth rates of the oceanic phytoplankton. Under Fe/Cu sufficiency, the Cu quotas ranged from 0.36 to 3.8 μmol Cu · mol −1 C. Copper levels in the growth medium had a significant positive effect on the Cu quotas, and this effect was dependent on the algal class. Under Fe/Cu sufficiency, the highest average Cu quotas were observed for the Bacillariophyceae, followed by the Cyanophyceae, Prymnesiophyceae, and lastly the Dinophyceae. Similar taxonomic trends were observed for the ρ ss Cu. Although the Cu:C ratios were not significantly higher in oceanic strains, there are five independent lines of evidence supporting a more important role of Cu in the physiology of the oceanic phytoplankton. The mixed‐effect model indicated a significant Cu effect on the growth rates and ρ ss Cu of the oceanic strains, but not the coastal strains. In addition, lowering the Cu concentration in the media decreased the Cu quotas and ρ ss Cu of the oceanic strains to a greater extent (5.5‐ and 5.4‐fold, respectively) than those of the coastals (3.8‐ and 4.7‐fold, respectively). Iron limitation only had a significant effect on the Cu quotas of the oceanic strains, and this effect was dependent on Cu level and taxonomic class. Our results highlight a complex physiological interaction between Fe and Cu in marine phytoplankton.
Год издания: 2012
Авторы: Jian Guo, Suzanne E. Lapi, Thomas J. Ruth, María T. Maldonado
Издательство: Wiley
Источник: Journal of Phycology
Ключевые слова: Marine and coastal ecosystems, Environmental Toxicology and Ecotoxicology, Heavy metals in environment
Другие ссылки: Journal of Phycology (HTML)
PubMed (HTML)