Interacting effects of light, temperature, and nutrients on C-14 uptake of oscillatoria rubescens de candolle

Abstract

The rate of C1402 uptake in a bacterized isolate of Oscillatoria rubescens indicates that within the ranges studied temperature caused the greatest variation followed by light intensity and nutrient concentration . The variation within interaction effects of light, temperature, and nutrients was higher than that within any other combination of interactions . High temperatures (25°C) shifted the light optimum of 0. rubescens growing in low to moderate nutrient levels from 1950 lux to 8oo lux .

Planktothrix rubescens’ seasonal dynamics and vertical distribution in Lake Pusiano (North Italy)

“…Between February and March the vertical displacement of P. rubescens followed the pattern described by Schmitt & Olive (1980), with the trichomes distributed along the column but more concentrated in the upper euphotic zone. In these conditions the dominant species grew up until the end of April when it reached the maximum abundance.…”

“…During the mixing period P. rubescens is spread within the entire water column but it is usually more concentrated in the upper part of the euphotic zone (Schmitt & Olive 1980). During summer stratification the metalimnetic position is maintained by performing a relatively slow (around 0.1-0.8 m d -1 ) buoyancy regulation (Reynolds 1984;Walsby et al 2001).…”

Photoinactivation in vivo of superoxide dismutase and catalase in the cyanobacterium Microcystis aeruginosa

“…Under extreme conditions, photoinhibition may lead to photooxidative cell damage and death [3]. Cyanobacteria can be particularly susceptible to photoinhibition [1][2][3][4][5]. Events during cyanobacterial photoinhibition have been studied using Microcystis 7820, a clonal isolate from a freshwater Microcystis aeruginosa bloom.…”

Succession of phytoplankton in a deep stratifying lake: Mondsee, Austria

“…In early September maximum development was around 12 °C, in accordance with observations by Findenegg (1971Findenegg ( , 1973. According to Konopka (1981) the vertical stratification of O. rubescens is primarily determined by light intensity, but the position of the layer on the vertical light gradient is affected by nutrient availability (Schmitt & Olive, 1980). Microcystis grew well at temperatures between 15 o and 20 °C, as observed by Ganf & Oliver (1982).…”