Always ready? Primary production of Arctic phytoplankton at the end of the polar night

• Published in: Limnology and Oceanography Letters
• Main Author: Clara J. M. Hoppe
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2022
• Subjects: Oceanography; GC1-1581; Arctic; Phytoplankton; polar night
• Online Access: https://doi.org/10.1002/lol2.10222; https://doaj.org/article/9ac19ac8c88841c2b863e6baf7b9d80f

Abstract The end of the polar night with the concurrent onset of photosynthetic biomass production ultimately leads to the spring bloom, which represents the most important event of primary production for the Arctic marine ecosystem. This dataset shows, for the first time, significant in situ biomass accumulation during the dark–light transition in the high Arctic, as well as the earliest recorded positive net primary production rates together with constant chlorophyll a‐normalized potential for primary production through winter and spring. The results indicate a high physiological capacity to perform photosynthesis upon re‐illumination, which is in the same range as that observed during the spring bloom. Put in context with other data, the results of this study indicate that also active cells originating from the low winter standing stock in the water column, rather than solely resting stages from the sediment, can seed early spring bloom assemblages.