Response of a phytoplankton community to nutrient addition under different CO2 and pH conditions

Hama, Takeo; Inoue, Tomoki; Suzuki, Risa; Kashiwazaki, Hiroto; Wada, Shigeki; Sasano, Daisuke; Kosugi, Naohiro; Ishii, Masayoshi

doi:10.1007/s10872-015-0322-4

Cited by 17 publications

(18 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…particularly Micromonas-like phylotypes, has been previously reported by Hama et al (2016) for a coastal planktonic community near Japan, as well as by others based on mesocosm experiments (Paulino et al, 2008;Brussaard et al, 2013). This response could be explained by an adjustment Biogeosciences Discuss., doi:10.5194/bg-2016-501, 2016 Manuscript under review for journal Biogeosciences Published: 6 December 2016 c Author(s) 2016.…”

Section: Phytoplankton Community and Nutrient Uptake Response To The supporting

confidence: 55%

Impact of ocean acidification on Arctic phytoplankton blooms and dimethylsulfide production under simulated ice-free and under-ice conditions

Hussherr¹,

Levasseur²,

Lizotte³

et al. 2016

Preprint

View full text Add to dashboard Cite

Abstract. In an experimental assessment of the potential impact of Arctic Ocean acidification on seasonal phytoplankton blooms and associated dimethylsulfide (DMS) dynamics, we incubated water from Baffin Bay under conditions representing an acidified Arctic Ocean. Using two light regimes simulating under-ice/ subsurface chlorophyll maxima (low light; Low PAR and no UVB) and ice-free (high light; High PAR + UVA + UVB) conditions, water collected at 38 m was exposed over 9 days to 6 levels of decreasing pH from 8.1 to 7.2. A phytoplankton bloom dominated by the centric diatoms Chaetoceros spp. reaching up to 7.5 &#181;g chlorophyll a L&#8722;1 took place in all experimental bags. Total dimethylsulfoniopropionate (DMSPT) and DMS concentrations reached 155 nmol L&#8722;1 and 19 nmol L&#8722;1, respectively. Under both light regimes, chlorophyll a and DMS concentrations decreased linearly with increasing proton concentration at all pH tested. Concentrations of DMSPT also decreased but only under high light and over a smaller pH range (from 8.1 to 7.6). In contrast to nanophytoplankton (2&#8211;20 &#181;m), picophytoplankton (&#8804; 2 &#181;m) was stimulated by the decreasing pH. We furthermore observed no significant difference between the two light regimes tested in term of chlorophyll a, phytoplankton abundance/ taxonomy, and DMSP/ DMS net concentrations. These results show that OA could significantly decrease the algal biomass and inhibit DMS production during the seasonal phytoplankton bloom in the Arctic, with possible consequences for the regional climate.

show abstract

Section: Phytoplankton Community and Nutrient Uptake Response To The supporting

confidence: 55%

Impact of ocean acidification on Arctic phytoplankton blooms and dimethylsulfide production under simulated ice-free and under-ice conditions

Hussherr¹,

Levasseur²,

Lizotte³

et al. 2016

Preprint

View full text Add to dashboard Cite

show abstract

“…These contrasting results could reflect differences in the initial picophytoplankton community composition and possible speciesspecific physiological response to OA. By contrast, a positive influence of a decreasing pH T on pico-phytoplankton abundance, and particularly Micromonas-like phylotypes, has been previously reported by Hama et al (2016) for a coastal planktonic community near Japan, as well as by others based on mesocosm experiments . This response could be explained by an adjustment of the CCM (carbon concentrating mechanism) used by these small cells at low pH.…”

Section: Phytoplankton Community and Nutrient Uptake Response To The mentioning

confidence: 68%

Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions

Hussherr¹,

Levasseur²,

Lizotte³

et al. 2017

Biogeosciences

View full text Add to dashboard Cite

Abstract. In an experimental assessment of the potential impact of Arctic Ocean acidification on seasonal phytoplankton blooms and associated dimethyl sulfide (DMS) dynamics, we incubated water from Baffin Bay under conditions representing an acidified Arctic Ocean. Using two light regimes simulating under-ice or subsurface chlorophyll maxima (low light; low PAR and no UVB) and ice-free (high light; high PAR + UVA + UVB) conditions, water collected at 38 m was exposed over 9 days to 6 levels of decreasing pH from 8.1 to 7.2. A phytoplankton bloom dominated by the centric diatoms Chaetoceros spp. reaching up to 7.5 µg chlorophyll a L −1 took place in all experimental bags. Total dimethylsulfoniopropionate (DMSP T ) and DMS concentrations reached 155 and 19 nmol L −1 , respectively. The sharp increase in DMSP T and DMS concentrations coincided with the exhaustion of NO − 3 in most microcosms, suggesting that nutrient stress stimulated DMS(P) synthesis by the diatom community. Under both light regimes, chlorophyll a and DMS concentrations decreased linearly with increasing proton concentration at all pH levels tested. Concentrations of DMSP T also decreased but only under high light and over a smaller pH range (from 8.1 to 7.6). In contrast to nanophytoplankton (2-20 µm), pico-phytoplankton (≤ 2 µm) was stimulated by the decreasing pH. We furthermore observed no significant difference between the two light regimes tested in term of chlorophyll a, phytoplankton abundance and taxonomy, and DMSP and DMS net concentrations. These results show that ocean acidification could significantly decrease the algal biomass and inhibit DMS production during the seasonal phytoplankton bloom in the Arctic, with possible consequences for the regional climate.

show abstract

“…For example, Domingues et al (2016) found that nutrient enrichment suppressed the negative effects of high CO 2 and UVR on cyanobacteria and diatoms in an estuarine community. Hama et al (2016), on the other hand, found significant effects of nutrient addition on phytoplankton growth only during the early stages of a 1 month mesocosm experiment, while the negative effects of higher acidification were evident only during the postbloom period.…”

Section: Introductionmentioning

confidence: 84%

Impact of Increased Nutrients and Lowered pH on Photosynthesis and Growth of Three Marine Phytoplankton Communities From the Coastal South West Atlantic (Patagonia, Argentina)

et al. 2021

View full text Add to dashboard Cite

Effect of global change variables on the structure and photosynthesis of phytoplankton communities was evaluated in three different sites of the Patagonian coast of Argentina: enclosed bay (Puerto Madryn, PM), estuarine (Playa Unión, PU), and open waters (Isla Escondida, IE). We exposed samples to two contrasting scenarios: Present (nutrients at in situ levels) vs. Future (with lowered pH and higher nutrients inputs), and determined growth and photosynthetic responses after 2 days of acclimation. Under the Future condition phytoplankton growth was higher in the estuarine site compared to those in PM and IE. This effect was the most pronounced on large diatoms. While the increase of photosynthetic activity was not always observed in the Future scenario, the lower photosynthetic electron requirement for carbon fixation (Φe,C = ETR/PmB) in this scenario compared to the Present, suggests a more effective energy utilization. Long-term experiments were also conducted to assess the responses along a 4 days acclimation period in PU. Diatoms benefited from the Future conditions and had significantly higher growth rates than in the Present. In addition, Φe,C was lower after the acclimation period in the Future scenario, compared to the Present. Our results suggest that the availability, frequency and amount of nutrients play a key role when evaluating the effects of global change on natural phytoplankton communities. The observed changes in diatom growth under the Future scenario in PU and IE and photosynthesis may have implications in the local trophodynamics by bottom up control.

show abstract

Response of a phytoplankton community to nutrient addition under different CO2 and pH conditions

Cited by 17 publications

References 55 publications

Impact of ocean acidification on Arctic phytoplankton blooms and dimethylsulfide production under simulated ice-free and under-ice conditions

Impact of ocean acidification on Arctic phytoplankton blooms and dimethylsulfide production under simulated ice-free and under-ice conditions

Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions

Impact of Increased Nutrients and Lowered pH on Photosynthesis and Growth of Three Marine Phytoplankton Communities From the Coastal South West Atlantic (Patagonia, Argentina)

Contact Info

Product

Resources

About