Data from: Molecular underpinnings and biogeochemical consequences of enhanced diatom growth in a warming Southern Ocean ...

• Main Authors: Jabre, Loay, Allen, Andrew E., McCain, J. Scott P., McCrow, John P., Tenenbaum, Nancy, Spackeen, Jenna L., Sipler, Rachel E., Green, Beverley R., Bronk, Deborah A., Hutchins, David A., Bertrand, Erin M.
• Format: Dataset
• Language: English
• Published: Dryad 2020
• Subjects: McMurdo Sound; Ross Sea; Southern Ocean
• Online Access: https://dx.doi.org/10.5061/dryad.cjsxksn3j; https://datadryad.org/stash/dataset/doi:10.5061/dryad.cjsxksn3j

The Southern Ocean (SO) harbours some of the most intense phytoplankton blooms on Earth. Changes in temperature and iron availability are expected to alter the intensity of SO phytoplankton blooms, but little is known about how environmental change will influence community composition and downstream biogeochemical processes. We performed experimental manipulations on surface ocean microbial communities from McMurdo Sound in the Ross Sea, with and without iron addition, at -0.5 °C, 3 °C, and 6 °C. We then examined nutrient uptake patterns as well as the growth and molecular responses of two dominant diatoms, Fragilariopsis and Pseudo-nitzschia, to these conditions. We found that nitrate uptake and primary productivity were elevated at increased temperature in the absence of iron addition, and were even greater at high temperature with added iron. Pseudo-nitzschia became more abundant under increased temperature without added iron, while Fragilariopsis required additional iron to benefit from warming. We ...