Correlation of methane production with physiological traits in IMS 101 grown with methylphosphonate at different temperatures.

The diazotrophic cyanobacterium has been recognized as a potentially significant contributor to aerobic methane generation via several mechanisms including the utilization of methylphophonate (MPn) as a source of phosphorus. Currently, there is no information about how environmental factors regulate methane production by . Here, we grew IMS101 at five temperatures ranging from 16 to 31°C, and found that its methane production rates increased with rising temperatures to peak (1.

Ocean acidification alters microeukaryotic and bacterial food web interactions in a eutrophic subtropical mesocosm.

Ocean acidification (OA) is known to influence biological and ecological processes, mainly focusing on its impacts on single species, but little has been documented on how OA may alter plankton community interactions. Here, we conducted a mesocosm experiment with ambient (∼410 ppmv) and high (1000 ppmv) CO concentrations in a subtropical eutrophic region of the East China Sea and examined the community dynamics of microeukaryotes, bacterioplankton and microeukaryote-attached bacteria in the enclosed coastal seawater. The OA treatment with elevated CO affected taxa as the phytoplankton bloom stages progressed, with a 72.

Corrigendum: Applying Dialysis Bags to Grow Microalgae and Measure Grazing Rates by Secondary Producers.

[This corrects the article DOI: 10.3389/fphys.2022.

Applying Dialysis Bags to Grow Microalgae and Measure Grazing Rates by Secondary Producers.

Traditional methods using sealed bottles to determine the grazing rates by secondary producers neglect chemical changes induced by biological activities during the incubation, giving rise to instable levels of nutrients, pH, CO, O and other chemicals along with changing microalgal cell concentrations and grazers' metabolism. Here, we used dialysis bags, which allows exchanges of nutrients and gases, to grow microalgae and to determine grazing rates of secondary producers. The specific growth rate of diatom within the dialysis bags increased with increasing water velocities, indicating its suitability to grow microalgae under dynamic water conditions.

Elevated pCO changes community structure and function by affecting phytoplankton group-specific mortality.

The rise of atmospheric pCO has created a number of problems for marine ecosystem. In this study, we initially quantified the effects of elevated pCO on the group-specific mortality of phytoplankton in a natural community based on the results of mesocosm experiments. Diatoms dominated the phytoplankton community, and the concentration of chlorophyll a was significantly higher in the high-pCO treatment than the low-pCO treatment.

Enhancement of diatom growth and phytoplankton productivity with reduced O availability is moderated by rising CO.

Many marine organisms are exposed to decreasing O levels due to warming-induced expansion of hypoxic zones and ocean deoxygenation (DeO). Nevertheless, effects of DeO on phytoplankton have been neglected due to technical bottlenecks on examining O effects on O-producing organisms. Here we show that lowered O levels increased primary productivity of a coastal phytoplankton assemblage, and enhanced photosynthesis and growth in the coastal diatom Thalassiosira weissflogii.

Disentangling the Effects of Ocean Carbonation and Acidification on Elemental Contents and Macromolecules of the Coccolithophore .

Elemental contents change with shifts in macromolecular composition of marine phytoplankton. Recent studies focus on the responses of elemental contents of coccolithophores, a major calcifying phytoplankton group, to changing carbonate chemistry, caused by the dissolution of anthropogenically derived CO into the surface ocean. However, the effects of changing carbonate chemistry on biomacromolecules, such as protein and carbohydrate of coccolithophores, are less documented.

Carbon assimilation and losses during an ocean acidification mesocosm experiment, with special reference to algal blooms.

A mesocosm experiment was conducted in Wuyuan Bay (Xiamen), China, to investigate the effects of elevated pCO on bloom formation by phytoplankton species previously studied in laboratory-based ocean acidification experiments, to determine if the indoor-grown species performed similarly in mesocosms under more realistic environmental conditions. We measured biomass, primary productivity and particulate organic carbon (POC) as well as particulate organic nitrogen (PON). Phaeodactylum tricornutum outcompeted Thalassiosira weissflogii and Emiliania huxleyi, comprising more than 99% of the final biomass.