title: Light-mediated recovery of N2-fixation in the blue-green algae Anabaena spp. in O2supersaturated waters.
abstract: It is well known that N2-fixation in blue-green algae is O2sensitive. However, at least two species of the filamentous, N2-fixing blue-green alga Anabaena possess an indigenous mechanism allowing recovery of nitrogenase activity during O2supersaturation. The process is light-mediated and appears to employ photoreduction as a means of overcoming N2inhibition. Such recovery should optimize radiant energy utilization and N2fixation in freshwater blooms, which are often O2supersaturated during peak daylight hours.
authors.affiliation: Ecology Division, Freshwater Section, Department of Scientific and Industrial Research, P.O. Box 415, Taupo, New Zealand.
authors.forename: Hans W
authors.initials: HW
authors.lastname: Paerl