Limits to productivity of the algaPleurochrysis carterae(Haptophyta) grown in outdoor raceway ponds

Abstract

This study examined the effects of oxygen concentration, pond temperature and irradiance on productivity and CaCO 3 formation of the coccolith-forming alga, Pleurochrysis carterae CCMP647 grown in semi-continuous culture in outdoor raceway ponds. During the day the oxygen content of the pond increases markedly and P. carterae photosynthesis is inhibited by these high O 2 concentrations with the inhibition increasing with increasing temperature. The high irradiance outdoors presents less of a problem to photosynthesis and productivity as the algae can acclimate well to high irradiances over a period of several weeks. Pond depth also effects productivity and this effect varies with season. During autumn, productivities were highest at depths of 13 to 16 cm, and decreased when the depth was increased. During summer productivity was much lower at 13 cm pond depth and increased when the depth was increased to 16, 18 and 21 cm. Heating the ponds in the morning by approximately 3 to 58C improves productivity by 11%-21%, presumably because this allows the algae to photosynthesise faster in the conditions of low [O 2 ] which occur in the early morning.

Improved Free Fatty Acid Production in Cyanobacteria with Synechococcus sp. PCC 7002 as Host

“…While the mechanism of this temperature-dependent FFA tolerance remains to be elucidated, the physiological effects of FFA production can be alleviated in Synechococcus sp. PCC 7002 by using lower temperatures (near 30°C) which are more desirable, as these temperatures are readily achieved in open outdoor cultivation systems without additional heating (Moheimani and Borowitzka, 2007). …”

Effect of Flue Gas on Microalgae Population and Study the Heavy Metals Accumulation in Biomass from Power Plant System

“…The amount of flue gas needed per hectare will differ per species of algae, and will also vary throughout the day with light intensity and temperature, thus needs to be optimized for each specific application. High dissolved concentrations of CO2 (and also SO2) will affect the pH, thus need to be controlled or buffered (Moheimani and Borowitzka, 2007).…”

A re-investigation of Chrysotila (Prymnesiophyceae) using material collected from the type locality

“…For more details on these topics, please see Braarud 1960;Rayns 1962;Brown et al , 1970Leadbeater 1970;Brown & Franke 1971;Gayral & Billiard 1977;Tittley & Shaw 1980;Gayral & Fresnel 1983;Tittley 1985;Fowler & Tittley 1993;Tittley et al 1999;Edvardsen et al 2000;Ozaki et al 2001;Lin & Corstjens 2002;Moheimani & Borowitzka 2007;Bendif et al 2013.…”