气候变化领域集成服务门户(CCPortal): The Arctic picoeukaryote Micromonas pusilla benefits from Ocean Acidification under constant and dynamic light

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.908691
	The Arctic picoeukaryote Micromonas pusilla benefits from Ocean Acidification under constant and dynamic light
	White; Emily; Hoppe; Clara Jule Marie; Rost; Björn
发布日期	2019-11-19
数据集类型	dataset
英文关键词	Arctic Ocean ; Dynamic Light ; Ocean acidification ; photophysiology ; Picoeukaryotes ; PSII
英文简介	Compared to the rest of the globe, the Arctic Ocean is affected disproportionately by climate change. Despite these fast environmental changes, we currently know little about the effects of ocean acidification (OA) on marine key species in this area. Moreover, the existing studies typically test the effects of OA under constant, hence artificial light fields. In this study, the abundant Arctic picoeukaryote Micromonas pusilla was acclimated to current (400 μatm) and future (900 μatm) pCO2 levels under a constant as well as dynamic light, simulating more realistic light fields as experienced in the upper mixed layer. To describe and understand the responses to these drivers, growth, particulate organic carbon (POC) production, elemental composition, photophysiology and reactive oxygen species (ROS) production were analysed. M. pusilla was able to benefit from OA on various scales, ranging from an increase in growth rates to enhanced photosynthetic capacity, irrespective of the light regime. These beneficial effects were, however, not reflected in the POC production rates, which can be explained by energy partitioning towards cell division rather than biomass build-up. In the dynamic light regime, M. pusilla was able to optimise its photophysiology for effective light usage during both low and high light periods. This effective photoacclimation, which was achieved by modifications to photosystem II (PSII), imposed high metabolic costs leading to a reduction in growth and POC production rates when compared to constant light. There were no significant interactions observed between dynamic light and OA, indicating that M. pusilla was able maintain effective photoacclimation without increased photoinactivation under high pCO2. Based on these findings, M. pusilla may exhibit a robust positive response to future Arctic Ocean conditions
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215104
推荐引用方式 GB/T 7714	White,Emily,Hoppe,et al. The Arctic picoeukaryote Micromonas pusilla benefits from Ocean Acidification under constant and dynamic light.2019-11-19.https://doi.org/10.1594/PANGAEA.908691.