On the Variability of Phytoplankton Photophysiology Along a Latitudinal Transect in the North Atlantic Surface Ocean

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Hedy M. Aardema, Hans A. Slagter, Isabella Hrabe de Angelis, Maria Ll. Calleja, Antonis Dragoneas, Simone Moretti, Nina Schuback, Lena Heins, David Walter, Ulrike Weis, Gerald H. Haug, Ralf Schiebel
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Abstract

Phytoplankton photosynthesis is the first step of energy capture in the open ocean and is therefore fundamental for global biogeochemical processes and ecosystem functioning. High-resolution methods are required to fully capture the variability of marine photosynthesis and its environmental drivers. Here, we combine two high-resolution underway methods to study phytoplankton photophysiology, Fast Repetition Rate fluorometry and Flow Cytometry, along a transect in the North-East Atlantic Ocean from the polar circle to the equator. Significant spatial distinctions in photophysiological strategies were found between biogeographical provinces. The most pronounced distinction was present between the subarctic North Atlantic and the oligotrophic subtropical gyre, where the latter was typified by high photosystem II (PSII) turnover rates, low pigment-to-cell volume ratios, low PSII quantum efficiency and low absorption cross sections for photochemistry in PSII. Small-scale variability along the transect results from varying diel cycles in photophysiology, possibly governed by light availability and cell metabolism. In general, we found that variability in PSII photochemistry was associated with variability in sea surface temperature, whereas the median mixed layer irradiance could explain more of the variation in the light harvesting capacity of the phytoplankton community. This implies that the expected climate change driven shoaling of the mixed layer may impact phytoplankton light harvesting strategies.

Abstract Image

关于北大西洋表层海洋纬向横断面浮游植物光生理学的变异性
浮游植物光合作用是开阔海洋捕获能量的第一步,因此对全球生物地球化学过程和生态系统功能至关重要。要全面捕捉海洋光合作用的变化及其环境驱动因素,需要高分辨率的方法。在这里,我们结合了两种高分辨率的水下方法来研究浮游植物的光生理学,即快速重复率荧光测定法和流式细胞仪法,沿东北大西洋从极圈到赤道的横断面进行研究。结果发现,不同生物地理区域之间的光生理学策略存在显著的空间差异。最明显的区别出现在亚北极北大西洋和低营养亚热带涡旋之间,后者的典型特征是光系统 II(PSII)周转率高、色素与细胞体积比低、PSII量子效率低和 PSII光化学吸收截面低。横断面上的小规模变化是光生理学中不同昼夜周期的结果,可能受光照可用性和细胞新陈代谢的影响。总的来说,我们发现 PSII 光化学作用的变化与海面温度的变化有关,而混合层辐照度中值可以解释浮游植物群落采光能力的更多变化。这意味着预期的气候变化导致的混合层倾斜可能会影响浮游植物的采光策略。
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来源期刊
Journal of Geophysical Research: Biogeosciences
Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
5.40%
发文量
242
期刊介绍: JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology
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