The influence of global change on Southern Ocean productivity will have major ramifications for future management of polar life. A prior laboratory study investigated the response of a batch‐cultured subantarctic diatom to projected change simulating conditions for 2100 (increased temperature/CO 2 /irradiance/iron; decreased macronutrients), showed a twofold higher chlorophyll‐derived growth rate driven mainly by temperature a...

Zinc (Zn) isotope fractionation by the coccolithophore Emiliania huxleyi (a Tasman Sea isolate) was investigated by culturing it across a range of free Zn 2+ ion concentrations (1.2 pmol L −1 to 3.2 nmol L −1 ), which span the natural range observed in the global oceans. Across the range of free Zn 2+ ion concentrations tested, the amount of bio‐available Zn did not have any appreciable influence on the specific growth rate or...

We investigated the effects of iron (Fe) limitation on the elemental stoichiometry, silicic acid (Si(OH) 4 ) uptake kinetics and cell morphology in two Southern Ocean diatoms Eucampia antarctica and Proboscia inermis and the temperate diatom Thalassiosira pseudonana . An increase in Fe‐stress resulted in reductions in specific growth rate and decreases in cellular nitrogen (N) and carbon (C) content relative to cellular biogen...

In laboratory experiments we examined the interplay of light and iron availability on the intracellular iron concentrations, specific growth rates, and photosynthetic physiology of Southern (S.) Ocean diatoms ( Eucampia antarctica and Proboscia inermis ) and the haptophyte Phaeocystis antarctica . Intracellular iron concentrations and iron : carbon (Fe : C) molar ratios increased with decreasing irradiance in temperate coastal...