Diel Patterns in Chlorophyll a Specific Absorption Coefficient and Absorption Efficiency Factor of Picoplankton

Rhythms during the polar night: evidence of clock-gene oscillations in the Arctic scallopChlamys islandica

“…Higher chlorophyll a concentrations were observed during the equinox than during the PN, with a maximum during the night. Such diel patterns in chlorophyll a were previously reported and associated with the diel periodicity of picoplankton, which are characterized by a lower abundance at midday under high irradiance and a maximum at night [34,35]. Picophytoplankton are the main primary producers in oligotrophic oceans and have been reported to dominate chlorophyll biomass in Arctic regions [36].…”

Light and photosynthetic microalgae: A review of cellular- and molecular-scale optical processes

“…The scattering cross-section had a daytime maximum and a minimum before the sunrise in (DuRand et al 2002;Stramski and Reynolds 1993). The shape of the absorption spectrum did not have diurnal variations in a study using Micromonas pusilla (DuRand et al 2002), whereas in papers by (Mercado et al 2006;Ohi et al 2005) the blue-to-red (440 nm and 490 nm to 675 nm) absorption band ratios increased in the afternoon indicating accumulation of carotenoids relative to chl a. The discrepancies in the diurnal variations remind us that there exists different photoacclimation strategies between microalgae classes and even between strains (Suggett et al 2007).…”

The specific inherent optical properties of three sub-tropical and tropical water reservoirs in Queensland, Australia

“…The type of change in a * for picoplankton has been shown to vary in different directions if the phytoplankton are living in high or low light conditions (Ohi et al, 2005). This would suggest that even if observations are made at similar times of day to counteract diurnal variations there may be some systematic variation due to the prevailing light conditions.…”