Eco-physiological responses of nitrogen-fixing cyanobacteria to light

Published on Jan 1, 2010
Paula de Tezanos Pinto9
Estimated H-index: 9
The eco-physiological responses of three nitrogen-fixing cyanobacteria (N-fixing cyanobacteria), Aphanizomenon gracile, Anabaena minderi ,a ndAna. torques-reginae, to light were assessed under nutrient saturation. The N-fixing cyanobacteria were isolated into monocultures from a natural bloom in a shallow colored lake and their growth irradiance parameters and pigment composition were assessed. The different ecological traits related to light use (lmax, a, Ik )s uggest that these N-fixing cyanobacteria are well adapted to low light conditions at sufficient nutrients, yet interspe- cific differences were observed. Aphanizomenon gracile and Anabaena minderi had high relative growth rates at low irradiances (ca. 70% of those in high light), low half saturation constant for light-limited growth (Ik \ 9.09 lmol photon m -2 s -1 ) and high efficiency (a \ 0.11 day -1 lmol photon -1 m 2 s). Conversely, Ana. torques-reginae showed poorer light competitive- ness: low relative growth rates at low irradiances (ca. 40% of those in high light), low a (0.009 day -1 lmol photon -1 m 2 s) and higher Ik (35.5 lmol photon m -2 s -1 ). Final densities in Aphanizomenon gracile and Anabaena minderi reached bloom densities at irradiances above 30 lmol photon m -2 s -1 with dif-
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