Journal
FRONTIERS IN MARINE SCIENCE
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmars.2022.998711
Keywords
diatom; diatom resting stages; photophysiology; sediment; Pacific Arctic shelves; Chukchi Sea
Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP20J20410]
- Arctic Challenge for Sustainability II (ArCS II) [JPMXD1420318865]
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Diatoms in the Pacific Arctic region form dense blooms and have high photophysiological plasticity and survival strategies in unfavorable conditions. They can quickly proliferate when sufficient light becomes available and have a high seeding potential in surface sediments, which is important for blooms in the Pacific Arctic shelf region.
Diatoms form dense blooms in the Pacific Arctic region from spring to summer, supporting the unique benthic-pelagic coupling ecosystems. Although the Arctic has a severe light-limited season from autumn to winter, diatoms can proliferate in spring when sufficient light becomes available for photosynthesis. One of the crucial strategies for diatoms to survive in unfavorable growing conditions is to form resting stages. Because of enhanced primary and export production in the Pacific Arctic shelves, many viable diatom resting stages can be detected in the surface sediments. However, little is known about the photophysiological response of viable diatom cells, including resting stages, in sediments to light availability. We conducted a laboratory experiment investigating the photophysiological capabilities of the diatom cells containing resting stages using surface sediments from the Chukchi Sea shelf. As a result, diatoms grew dramatically after light exposure, and Chaetoceros socialis complex highly contributed to the enhanced diatom abundance. Their photophysiological changes were also evident from the maximum quantum efficiency (F-v/F-m) of photochemistry in photosystem II, C-13-based photosynthetic-energy (PE) parameters, diadinoxanthin (DD)-diatoxanthin (DT) pool size, and the de-epoxidation state (DES) of DD. Even after the excess light exposure suppressed the photosynthetic activity in the microalgal cells, the diatoms recovered quickly, indicating the high photophysiological plasticity to dynamic light changes. Therefore, our results suggest that diatoms in surface sediments have a high seeding potential for blooms in the Pacific Arctic shelf region.
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