By Richard J. Geider, Bruce A. Osborne (auth.)
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Extra info for Algal Photosynthesis
Prolonged incubation of tissue discs generally leads to rates of photosynthesis and respiration that are lower than those observed in freshly excised material (Hatcher, 1977; Arnold and Manley, 1985). Within-blade variability of photosynthesis and respiration rates have been reported for Laminaria spp. (Hatcher, 1977; Kuppers and Kremer, 1978) and Macrocystis spp. (Arnold and Manley, 1985). 5. Rates of photosynthesis and respiration in Macrocystis pyrifera. 003 Adapted from Arnold and Manley (1985).
1973) a maximum Pch1 of approximately 30 g C·g- 1 chla·d- 1 was found, whereas more recently Laws et al. (1989) obtained maximum Pch1 of 100-150 g C·g- 1 chla·- 1d- 1. Since Pch1 tends to decrease when microalgae are exposed to adverse growth conditions, it would appear that contamination may have been a problem in some of the earlier investigations of open ocean primary productivity. What Does 14C Uptake Measure? The preceding section considered problems that may arise in any study of algal photosynthesis in which samples for observation are enclosed.
Sources. 98 Data from Myers (1980) and Pirt (1986). (Axelsson, 1988) have been obtained for macroalgae from the Chlorophyceae, Phaeophyceae, and Rhodophyceae, with no significant difference in the values for different taxonomic groups. These values were obtained at air-equilibrium O 2 concentrations in natural seawater. Buesa (1980) measured O 2and CO2exchange using a Warburg manometer and Axelsson (1988) measured pH and O 2 in a well-mixed flow through chamber. In both cases, diffusive boundary layers at the algal surface are expected to be minimized.
Algal Photosynthesis by Richard J. Geider, Bruce A. Osborne (auth.)