Response of microalgae to elevated CO2 and temperature: impact of climate change on freshwater ecosystems

Li, Wei; Xu, Xiaoguang; Fujibayashi, Megumu; Niu, Qigui; Tanaka, Nobuyuki; Nishimura, Osamu

doi:10.1007/s11356-016-7180-5

Cited by 50 publications

(22 citation statements)

References 60 publications

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“…The LM model showed that the FI of fDOM-2 was significantly positively correlated with diatom abundance (Table 2). It is well known that amino acids can be released by algal activity (Henderson et al 2008;Li et al 2016). The FI of fDOM-2 was also significantly positively correlated with bacterial abundance in the diatom treatment (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 70%

“…The fDOM-5 components were considered to be tyrosine-like materials (Cory and McKnight 2005;Yamashita et al 2010). Both could be released during algal activity (Li et al 2016;Yamashita and Tanoue 2003), and were good substrates for bacteria (Wetzel 2001;Pérez and Sommaruga 2006). Moreover, bacteria also release the extracellular polymeric substances (EPS) such as carbohydrates and proteins (Elliott et al 2006;Salama et al 2015).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Influence of parasitic chytrids on the quantity and quality of algal dissolved organic matter (AOM)

et al. 2018

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Algae-derived dissolved organic matter (AOM) is an important nutrient source for heterotrophic bacteria, while AOM such as humic substances pose significant challenges during water treatment processing. We hypothesized that the parasitic infection of algae could change the composition and concentration of AOM. This study investigated the quality and quantity of DOM and bacterial abundance in diatom (Synedra) cultures, with and without parasitic fungi (chytrids). The quality of DOM was analyzed using three-dimensional excitation-emission matrix combined with parallel factor analysis (EEM-PARAFAC) and was compared to changes in algal and bacterial cell numbers. Bacterial abundance was higher and dissolved organic carbon concentrations were lower in the diatom cultures infected with parasitic fungi. Among the DOM compounds, the concentrations of tryptophan-like material derived from algae were significantly lower and the concentrations of humic substance-like material were higher in the infected treatment. The parasitic fungi may have consumed tryptophan-like material and stimulated the release of humic substances. These results provide the first evidence that fungal infection may modulate algal-bacterial interactions, which are associated with changes in the nature of AOM.

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Section: Accepted Manuscriptmentioning

confidence: 70%

Section: Accepted Manuscriptmentioning

confidence: 99%

Influence of parasitic chytrids on the quantity and quality of algal dissolved organic matter (AOM)

et al. 2018

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“…Both the diatoms, P. triconutum and N. ovalis , have been found to display the same compartmentation for isoprenoid biosynthesis, as previously found in higher plants, the red alga Porphyridium cruentum and the chrysophyte Ochromonas danica [ 160 ]. The extracellular carbohydrates of the diatom Cyclotella meneghiniana have been found to increase with elevated CO 2 and temperature [ 161 ]. Inlet pCO 2 have been found to enhance lipid production along with chitin formation in Cyclotella sp.…”

Section: Opportunities and Challenges Of Co 2 Smentioning

confidence: 99%

Diatoms for Carbon Sequestration and Bio-Based Manufacturing

Sethi

Butler

Shuhaili

et al. 2020

Biology

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Carbon dioxide (CO2) is a major greenhouse gas responsible for climate change. Diatoms, a natural sink of atmospheric CO2, can be cultivated industrially in autotrophic and mixotrophic modes for the purpose of CO2 sequestration. In addition, the metabolic diversity exhibited by this group of photosynthetic organisms provides avenues to redirect the captured carbon into products of value. These include lipids, omega-3 fatty acids, pigments, antioxidants, exopolysaccharides, sulphated polysaccharides, and other valuable metabolites that can be produced in environmentally sustainable bio-manufacturing processes. To realize the potential of diatoms, expansion of our knowledge of carbon supply, CO2 uptake and fixation by these organisms, in conjunction with ways to enhance metabolic routing of the fixed carbon to products of value is required. In this review, current knowledge is explored, with an evaluation of the potential of diatoms for carbon capture and bio-based manufacturing.

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“…Experimental studies are therefore important tools to test the effects of climate change in aquatic ecosystem (see for example Li et al, 2016;Short et al, 2016). In fact, the majority of these experimental studies have been developed in temperate regions, and thus offer little insight about the impact of climate change in tropical aquatic ecosystems (see Roland et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of global climate change on chlorophyll-a concentrations in a tropical aquatic system during a cyanobacterial bloom: a microcosm study

2017

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Recent studies have investigated the impact of climate change on aquatic environments, and Chlorophyll-a (Chl-a) concentration is a quick and reliable variable for monitoring such changes. This study evaluated the impact of rainfall frequency as a diluting agent and the effect of increased temperature on Chl-a concentrations in eutrophic environments during a bloom of cyanobacteria. This was based on the hypothesis that the concentration of Chl-a will be higher in treatments in which the rainfall frequency is not homogeneous and that warmer temperatures predicted due to climate change should favor higher concentrations of Chl-a. The experiment was designed to investigate three factors: temperature, precipitation and time. Temperature was tested with two treatment levels (22°C and the future temperature of 25°C). Precipitation was tested with four treatments (no precipitation, a homogeneous precipitation pattern, and two types of concentrated precipitation patterns). Experiments were run for 15 days, and Chl-a concentration was measured every five days in each of the temperature and precipitation treatments. The water used in the microcosms was collected from a eutrophic lake located in Central Brazil during a bloom of filamentous cyanobacteria (Geilterinema amphibium). Chl-a levels were high in all treatments. The higher temperature treatment showed increased Chl-a concentration (F=10.343; P=0.002); however, the extreme precipitation events did not significantly influence P=0.326). Therefore, the study demonstrates that future climatic conditions (projected to 2100), such as elevated temperatures, may affect the primary productivity of aquatic environments in tropical aquatic systems.Keywords: extreme events, Geitlerinema amphibium, primary productivity, temperature. o monitoramento de ambientes aquáticos. O objetivo do presente estudo foi avaliar o impacto da frequência da precipitação e do aumento da temperature na concentração de Clo-a em um ambiente aquático eutrófico durante um período de floração de cianobactéria. As hipóteses para o presente trabalho: i) A concentração de Clo-a será maior em tratamentos em que a frequencia de precipitação não é homogênea, e ii) Temperaturas mais quentes devem promover aumento na concentração de Clo-a. Foi utilizado um desenho experimental com três fatores: Precipitação, temperature e tempo. A temperature foi avaliada em dois tratamentos (22°C e a temperatura futura de 25°C). A precipitação foi avaliada em quatro tratamentos (ausência de precipitação, precipitação homogênea, e dois tipos precipitação concentrada). O experimento foi desenvolvido por 15 dias e a concentração de Clo-a foi mensurada a cada cinco dias para cada tratamento. Os níveis de Clo-a foram elevados em todos tratamentos, além disso, a concentração de Clo-a foi maior em tratamentos mais aquecidos (simulando cenário futuro) (F=10.343; P=0.002); entretanto, os eventos extremos de precipitação não demonstraram influência na concentração de P=0.326). Portanto, o presente trabalho demonstrou que as c...

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Response of microalgae to elevated CO2 and temperature: impact of climate change on freshwater ecosystems

Cited by 50 publications

References 60 publications

Influence of parasitic chytrids on the quantity and quality of algal dissolved organic matter (AOM)

Influence of parasitic chytrids on the quantity and quality of algal dissolved organic matter (AOM)

Diatoms for Carbon Sequestration and Bio-Based Manufacturing

Effects of global climate change on chlorophyll-a concentrations in a tropical aquatic system during a cyanobacterial bloom: a microcosm study

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