Effect of phosphorus and temperature on chlorophyll a contents and cell sizes of Scenedesmus obliquus and Microcystis aeruginosa

Abstract

An experiment was carried out to evaluate the effects of phosphorus concentration (1, 4 and 10 mg l -1 ) and temperature (15 and 25°C) on chlorophyll a (chl a) contents and cell size/volume of green alga Scenedesmus obliquus and blue green alga Microcystis aeruginosa. Long-term field data from Lake Taihu, a large, shallow eutrophic lake between Jiangsu and Zhejiang Provinces, China, was also used to evaluate the effect of temperature on the model between chl a and total phosphorus (TP). The chl a content of both algae increased with an increase in phosphorus concentration and temperature. Temperatures showed a significantly different effect on chl a content of S. obliquus at a phosphorus concentration of 10 mg l -1 , whereas there was no significant difference at the two lower phosphorus levels. For M. aeruginosa, temperatures presented significantly different effects on the chl a contents at three phosphorus concentrations. Chl a content of neither alga presented an interaction between the nutrient and the temperature. Long-term field data from Lake Taihu also indicated that the addition of temperature to the model increased predictability of chl a by TP. The length/diameter and volume of both algae were greater at the lower temperature and phosphorus concentration. Moderate negative correlations were observed between algal size, volume, and chl a content. Our results suggest that phosphorus concentration and temperature could change chl a contents and size in species-specific algal cells and that temperature should be considered when building the model of TP and chl a concentration.

Temperature and Light Modulation of Herbicide Toxicity on Algal and Cyanobacterial Physiology

“…Similarly, chlorophyll and carotenoid contents were lower in the green algae Chlamydomonas reinhardtii grown under 15 • C compared to 25 • C . Chen et al (2010), in turns, observed an increased chlorophyll content in the cyanobacteria Microcystis aeruginosa grown at 25 • C in relation to 10 • C. On the other hand, chlorophyll content was not significantly affected by temperature in the diatom Navicula pelliculosa (at 10, 15, and 25 • C) (Chalifour and Juneau, 2011) or in the cyanobacteria Merismopedia tenuissima and Oscillatoria sp. (at 15, 20, 25, and 30 • C) (Coles and Jones, 2000).…”

Effects of linear alkylbenzene sulfonate (LAS) on the interspecific competition between Microcystis and Scenedesmus

“…The average cell biovolume of S. obliquus used in the current study was determined as 102 μm 3 cell −1 via a laser particle analyzer (Li et al 2015a) which was slightly lower than 121 μm 3 cell −1 as reported by Lürling (2006). The average cell biovolume of M. aeruginosa (FACHB 469) was calculated as 11.5 μm 3 cell −1 according our previous study (Li et al 2013b), which was much lower than 16 μm 3 cell −1 reported by Chen et al (2011b) (setting its diameter as 3.1 μm and calculated as a sphere). The maximum cell density of S .…”

Comparative investigation of minerals, chlorophylls contents, fatty acid composition and thermal profiles of olive leaves (<em>Olea europeae</em> L.) as by-product

“…The influence of genetic factors on chlorophyll content was confirmed by Bojovic and Markovic (2009) who investigated the variability of the chlorophyll content of wheat leaf with cultivar. Furthermore, chlorophyll content is usually affected by various environmental factors such as temperature, photoperiod, nitrogen, water and degree of maturity (Chen et al, 2011;Lee et al, 2011).…”