Recent light history effects on photophysiology measured under low light.

• Main Authors: Yayla Sezginer (11819858), David J. Suggett (6749354), Robert W. Izett (11216646), Philippe D. Tortell (11216655)
• Format: Still Image
• Language: unknown
• Published: 2021
• Subjects: Biochemistry; Biotechnology; Evolutionary Biology; Ecology; Marine Biology; Inorganic Chemistry; Plant Biology; Environmental Sciences not elsewhere classified; Biological Sciences not elsewhere classified; results highlight environmental; relaxation times longer; photosynthetic electron transport; observed strong non; numerical model used; minute period used; increased vertical mixing; barrow strait regions; marine phytoplankton photophysiology; different photophysiological parameters; canadian arctic archipelago; future underway fluorescence; require dark acclimation; div >< p; fluorescence relaxation kinetics; analyze fluorescence kinetics; two chlorophyll fluorescence; based photochemistry estimates; based nutrient sources; dark acclimation; arctic phytoplankton; based estimates; primary photochemistry; photophysiological diagnostics; chlorophyll fluorescence; based values; based efforts; based approaches; based algorithms; resolution mapping; prompt discussion; photochemical quenching; nutrient stress; new algorithm; methodological influences; lancaster sound; full transect; fold higher; dependent effects; continuous ship; actinic light; Arctic; Barrow Strait; Canadian Arctic Archipelago; Lancaster Sound; Arctic Archipelago; Phytoplankton
• Online Access: https://doi.org/10.1371/journal.pone.0256410.g004

FRRf-derived photophysiological parameters measured under low light are plotted against in-situ surface PAR at the time of sample acquisition. Panels (a) and (b) show F v / F m and σ PSII measurements made after 5 min of low light exposure. Panels (c) and (d) show NPQ and residual quenching measured after low light treatment. Lines of best fit are shown for Barrow Strait (solid line) and Lancaster Sound (dashed line). Full regression analyses results are reported in S2 Table . Error bars show standard error, but are often concealed by size of data symbols.