Iron and manganese co-limit growth of the Southern Ocean diatom Chaetoceros debilis


Autoři: Franziska Pausch aff001;  Kai Bischof aff002;  Scarlett Trimborn aff001
Působiště autorů: EcoTrace, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany aff001;  Marine Botany, University of Bremen, Bremen, Germany aff002
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0221959

Souhrn

In some parts of the Southern Ocean (SO), even though low surface concentrations of iron (Fe) and manganese (Mn) indicate FeMn co-limitation, we still lack an understanding on how Mn and Fe availability influences SO phytoplankton ecophysiology. Therefore, this study investigated the effects of Fe and Mn limitation alone as well as their combination on growth, photophysiology and particulate organic carbon production of the bloom-forming Antarctic diatom Chaetoceros debilis. Our results clearly show that growth, photochemical efficiency and carbon production of C. debilis were co-limited by Fe and Mn as highest values were only reached when both nutrients were provided. Even though Mn-deficient cells had higher photochemical efficiencies than Fe-limited ones, they, however, displayed similar low growth and POC production rates, indicating that Mn limitation alone drastically impeded the cell’s performance. These results demonstrate that similar to low Fe concentrations, low Mn availability inhibits growth and carbon production of C. debilis. As a result from different species-specific trace metal requirements, SO phytoplankton species distribution and productivity may therefore not solely depend on the input of Fe alone, but also critically on Mn acting together as important drivers of SO phytoplankton ecology and biogeochemistry.

Klíčová slova:

Biology and life sciences – Organisms – Eukaryota – Plants – Algae – Phytoplankton – Diatoms – Animals – Invertebrates – Plankton – Cell biology – Cellular structures and organelles – Cellular types – Plant science – Plant cell biology – Chloroplasts – Chlorophyll – Plant cells – Physical sciences – Chemistry – Chemical elements – Manganese – Materials science – Materials – Pigments – Organic pigments – Physics – Electromagnetic radiation – Light – Ecology and environmental sciences – Aquatic environments – Earth sciences – Marine and aquatic sciences – Marine environments – Sea water – People and places – Geographical locations – Antarctica


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