z-logo
open-access-imgOpen Access
Interactive effects of iron and temperature on the growth of Fragilariopsis cylindrus
Author(s) -
Jabre Loay,
Bertrand Erin M.
Publication year - 2020
Publication title -
limnology and oceanography letters
Language(s) - English
Resource type - Journals
ISSN - 2378-2242
DOI - 10.1002/lol2.10158
Subject(s) - phytoplankton , global warming , environmental science , ecology , growth rate , ecosystem , climate change , biology , chemistry , oceanography , nutrient , geology , mathematics , geometry
Iron and temperature are important drivers controlling phytoplankton growth in the Southern Ocean (SO). Most studies examining phytoplankton responses to these variables consider them independently, testing responses to changing temperature under constant iron and vice versa. Consequently, we lack a phenomenological and mechanistic understanding of how concurrent changes in these variables influence primary productivity. Here, we used a matrix of three temperatures and eight iron levels to examine changes in growth rate, photophysiology, and size in Fragilariopsis cylindrus . Temperature and iron interactively influenced growth; warming decreased iron demand, allowing cells to maintain half‐maximal growth rate at lower iron concentrations. We also observed possible mechanisms underpinning this phenomenon: warming increased light‐harvesting cross section and reduced cell size, thereby increasing light energy availability and iron uptake efficiency. These results suggest that interactive iron‐warming effects could lead to larger increases in SO phytoplankton growth than those currently predicted by marine ecosystem models.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here