The effect of elevated CO2 on autotrophic picoplankton abundance and production in a eutrophic lake (Lake Taihu, China)

The effects of elevated CO2 concentrations on the community structure and primary production of the autotrophic picoplankton of a eutrophic lake were studied in Lake Taihu, China. We conducted in situ experiments with three CO2 concentrations (270, 380 and 750ppm) over four seasons during 2012 and 2013. Our results showed that phycocyanin-rich picocyanobacteria were dominant in winter and that photosynthetic picoeukaryotes were prevalent during the other three seasons. CO2 elevation could significantly increase the abundance of photosynthetic picoeukaryotes in all seasons except winter, but did not have any influence on picocyanobacterial abundance. CO2 enrichment caused an increase in the primary production of the picoplankton community in most seasons, and significant differences were observed among the treatments in summer and winter. In addition, the contribution of picoplankton to total primary production significantly increased under higher CO2 concentrations in winter. The increase in the abundance of photosynthetic picoeukaryotes and the primary production of picoplankton under high CO2 concentrations may reduce the transfer of matter and energy to higher trophic levels and increase the importance of the microbial food web.

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Population dynamics of Cymodocea nodosa under future ocean scenarios.

10.1101/484634 ◽

2018 ◽

Author(s):

Amrit K Mishra

Keyword(s):

Population Dynamics ◽

Elevated Co2 ◽

Marine Ecosystem ◽

Co2 Enrichment ◽

Cymodocea Nodosa ◽

Long Term Effects ◽

Leaf Production ◽

Co2 Concentrations ◽

Carbon Dioxide Co2

Rising carbon dioxide (CO2) concentrations in the atmosphere will increase the average pCO2 level in the world oceans, which will have a knock-on effect on the marine ecosystem. Coastal seagrass communities are predicted to benefit from the increase in CO2 levels, but long-term effects of elevated CO2 on seagrass communities are less understood. Population reconstruction techniques were used to investigate the population dynamics of Cymodocea nodosa meadows, exposed to long term elevated CO2 at volcanic seeps off Greece and Italy. Effect of elevated CO2 was noticed on the growth, morphometry, density, biomass and age structure at CO2 seeps than reference sites. Above to below ground biomass ratio of C. nodosa were higher at CO2 seeps. The shoot age and shoot longevity of plants were lower at seeps. The present recruitment (sampled year) of the seagrass were higher than long-term average recruitment of the communities near the seeps. Carbon to nitrogen ratios (%DW) and annual leaf production of C. nodosa were higher in leaves at seeps. This study suggests under long-term CO2 enrichment C. nodosa production increases, but the plant survival rate decreases because of other co-factors such as nutrient availability and trace metal toxicity. Therefore, along with high CO2 other factors must be taken into consideration while predicting effects of future CO2 concentrations.

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The responses of phytoplankton communities to elevated CO2 show seasonal variations in the highly eutrophic Lake Taihu

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2015-0151 ◽

2016 ◽

Vol 73 (5) ◽

pp. 727-736 ◽

Cited By ~ 8

Author(s):

Xiaoli Shi ◽

Xuhui Zhao ◽

Min Zhang ◽

Zhou Yang ◽

Ping Xu ◽

...

Keyword(s):

Inorganic Carbon ◽

Dissolved Inorganic Carbon ◽

Net Primary Production ◽

Lake Taihu ◽

High Growth ◽

Eutrophic Lake ◽

High Growth Rate ◽

Four Seasons ◽

Phytoplankton Communities

From April 2012 to January 2013 (over four seasons), in situ microcosm experiments were conducted in Lake Taihu, perturbed over a range of pCO2 scenarios (270, 380, and 750 μatm; 1 atm = 101.325 kPa). The influence of CO2 level on microcosms was greatest during the spring because of the high growth rate of phytoplankton. In this season, rising CO2 levels caused a pH reduction, and the maximum reduction was 0.6 units when CO2 level was enhanced from the present level to 750 μatm. The doubling of CO2 level could increase the net primary production (NPP) by 65% during spring when the concentrations of other nutrients were maintained. The rise of NPP could cause a decline of dissolved inorganic carbon (DIC) concentration, and CO2 enrichment might mitigate the extent of this decline. Meanwhile, higher CO2 may slow or prevent a loss of diversity of phytoplankton in microcosms in this season. During the other three seasons, Microcystis predominated, and the percentage of cyanobacteria did not alter with the change of CO2. We did not observe a significant increase in the abundance of any taxa with the rise of CO2 during the in situ microcosm experiments.

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Free Air CO2 Enrichment (FACE) of grapevine (Vitis vinifera L.): II. Growth and quality of grape and wine in response to elevated CO2 concentrations

European Journal of Agronomy ◽

10.1016/s1161-0301(00)00093-9 ◽

2001 ◽

Vol 14 (2) ◽

pp. 145-155 ◽

Cited By ~ 97

Author(s):

M. Bindi ◽

L. Fibbi ◽

F. Miglietta

Keyword(s):

Vitis Vinifera ◽

Elevated Co2 ◽

Co2 Enrichment ◽

Vitis Vinifera L ◽

Co2 Concentrations ◽

Free Air Co2 Enrichment ◽

Free Air

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Enhancing growth of Chlamydomonas reinhardtii and nutrient removal in diluted primary piggery wastewater by elevated CO2 supply

Water Science & Technology ◽

10.2166/wst.2017.111 ◽

2017 ◽

Vol 75 (10) ◽

pp. 2281-2290 ◽

Cited By ~ 6

Author(s):

Fan Qi ◽

Yan Xu ◽

Yi Yu ◽

Xiaosheng Liang ◽

Li Zhang ◽

...

Keyword(s):

Chlamydomonas Reinhardtii ◽

Nutrient Uptake ◽

Elevated Co2 ◽

Total Nitrogen ◽

Total Phosphorus ◽

Nutrient Removal ◽

Co2 Enrichment ◽

Piggery Wastewater ◽

Co2 Concentrations ◽

Feasible Option

The coupling of primary piggery wastewater as a culture medium with elevated CO2 aeration is thought to be an economically feasible option for the cultivation of microalgae. However, little information is available regarding the photosynthetic characteristics of microalgae and nutrient removal from wastewater at different CO2 concentrations. It was found that elevated CO2 aeration provided sustained growth at CO2 concentrations ranging from 5% to 15% and performed best with 5% CO2 aeration in primary piggery wastewater for Chlamydomonas reinhardtii growth. Photosynthesis, respiration, and nutrient uptake (total nitrogen and total phosphorus) were stimulated in response to CO2 enrichment, thus increasing nutrient uptake in primary piggery wastewater, particularly total nitrogen and total phosphorus. A study of carbon-concentrating mechanism-related gene expression revealed that the levels of mRNAs, such as CAH1, LCIB and HLA3, were significantly downregulated. This represents a possible method for the reconciliation of CO2-stimulated growth with mixotrophic cultivation of C. reinhardtii in diluted primary piggery wastewater.

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Dynamics of annual nutrinets and bloom-forming cyanobacteria, revealed by daily observation in a hyper-eutrophic lake

10.5194/egusphere-egu2020-9515 ◽

2020 ◽

Author(s):

Mengyuan Zhu ◽

Guangwei Zhu ◽

Hans Paerl ◽

Wei Zhang ◽

Hai Xu

Keyword(s):

Water Column ◽

Phytoplankton Biomass ◽

Lake Taihu ◽

Eutrophic Lake ◽

Trophic Levels ◽

Monitoring Data ◽

Limiting Factors ◽

Nutrient Concentrations ◽

Nitrogen And Phosphorus ◽

Chl A

<p>Daily monitoring over a period of one year in Lake Taihu, China, included chlorophyll a (Chl-a) and nutrient measurements, determining the taxonomic composition of the phytoplankton community and various water column physicochemical parameters. Chl-a and nutrient concentrations showed strong circadian variations &#8210; Chl-a rised during daylight hours, while ammonium and phosphate rised at night. Chl-a concentrations also showed strong seasonal variations, with one annual peak in spring and another from summer to autumn, dominated by Dolichospermum spp. and Microcystis spp. respectively. Temperature appeared to exert the most important effect in this species succession. A nutrient&#8210;Chl-a balance calculation indicated that both nitrogen and phosphorus in the water column could be limiting factors for phytoplankton growth during bloom periods. Over two thirds of particulate nutrients was attributed to phytoplankton biomass during blooms. Daily (or weekly) monitoring data provided more precise description of water quality, capturing short-term peaks in phytoplankton biomass, and reduced risks of under- or overestimating trophic levels in lakes, which always happened when using monthly monitoring data.</p>

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Pest and disease abundance and dynamics in wheat and oilseed rape as affected by elevated atmospheric CO2 concentrations

Functional Plant Biology ◽

10.1071/fp12162 ◽

2013 ◽

Vol 40 (2) ◽

pp. 125 ◽

Cited By ~ 5

Author(s):

Viktoriya Oehme ◽

Petra Högy ◽

Jürgen Franzaring ◽

Claus P. W. Zebitz ◽

Andreas Fangmeier

Keyword(s):

Elevated Co2 ◽

Oilseed Rape ◽

Spring Wheat ◽

Co2 Enrichment ◽

Plant Phenology ◽

Plant Diseases ◽

Atmospheric Co2 ◽

Pest Species ◽

Co2 Concentrations ◽

Atmospheric Co2 Concentrations

Future atmospheric CO2 concentrations are predicted to increase, and directly affect host plant phenology, which, in turn, is assumed to mediate the performance of herbivorous insects indirectly as well as the abundance and epidemiology of plant diseases. In a 4-year field experiment, spring wheat (Triticum aestivum L. cv. Triso) and spring oilseed rape (Brassica napus L. cv. Campino) were grown using a mini- free-air CO2 enrichment (FACE) system, which consisted of a control (CON), an ambient treatment (AMB) and FACE treatments. The CON and AMB treatments did not receive additional CO2, whereas the FACE plots were moderately elevated by 150 μL L–1 CO2. The impact of elevated CO2 was examined with regard to plant phenology, biomass, leaf nitrogen and carbon, abundance of insect pest species and their relative population growth by either direct counts or yellow sticky traps. Occurrence and damage of plants by pathogens on spring wheat and oilseed rape were directly assessed. Disease infestations on plants were not significantly different between ambient and elevated CO2 in any of the years. Plant phenology, aboveground biomass, foliar nitrogen and carbon concentrations were also not significantly affected by CO2 enrichment. In contrast, the abundance of some species of insects was significantly influenced by elevated CO2, showing either an increase or a decrease in infestation intensity.

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Faculty Opinions recommendation of Effects of elevated CO2 on grain yield and quality of wheat: results from a 3-year free-air CO2 enrichment experiment.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1196958.662056 ◽

2009 ◽

Author(s):

Christian Körner

Keyword(s):

Grain Yield ◽

Elevated Co2 ◽

Co2 Enrichment ◽

Yield And Quality ◽

Free Air Co2 Enrichment ◽

Free Air ◽

Grain Yield And Quality

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ENERGY TRANSFER EFFICIENCIES ON LOWER TROPHIC LEVELS WITH INTENSIVE OYSTER FARMING IN HIROSHIMA BAY, JAPAN

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.21610/conferencearticle_58b43169dc569 ◽

2017 ◽

Author(s):

Akira Umehara ◽

Satoshi Asaoka ◽

Naoki Fujii ◽

...

Keyword(s):

Energy Transfer ◽

Primary Production ◽

Skeletonema Costatum ◽

Warm Season ◽

Nutrient Supply ◽

Trophic Levels ◽

Phytoplankton Primary Production ◽

Mean Values ◽

Hiroshima Prefecture ◽

Study Species

In enclosed water areas, organic matters are actively produced by phytoplankton due to abundant nutrient supply from the rivers. In our study area of the semi-enclosed Hiroshima Bay, oyster farming consuming high primary production has been developed since the 1950s, and the oyster production of Hiroshima prefecture have had the largest market share (ca. 60%) in Japan. In this study, species composition of phytoplankton, primary production, and secondary production of net zooplanktons and oysters were determined seasonally at seven stations in the bay between November 2014 and August 2015. In the bay, diatoms including Skeletonema costatum dominated during the period of the study. The primary productions markedly increased during summer (August), and its mean values in the northern part of the bay (NB) and the southern part (SB) were 530 and 313 mgC/m2/d, respectively. The productions of net zooplankton and oyster increased during the warm season, and its mean values in the NB were 14 and 1.2 mgC/m2/d, and in SB were 28 and 0.9 mgC/m2/d, respectively. The energy transfer efficiencies from the primary producers to the secondary producers in the NB and SB were 2.8% and 9.1%, respectively. However, the transfer efficiency to the oysters was approximately 0.3% in the bay. This study clearly showed the spatial difference of the productions and transfer efficiencies, and the low contribution of the production of oysters in secondary productions in Hiroshima Bay.

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