Effect of increases in temperature and nutrients on phytoplankton community structure and photosynthesis in the western English Channel

Xie, Yuyuan; Tilstone, Gavin H.; Widdicombe, CL; Woodward, E. Malcolm S.; Harris, Carolyn; Barnes, Mks

doi:10.3354/meps11101

Cited by 32 publications

(33 citation statements)

References 62 publications

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“…Nitrate concentrations varied more widely (from 9.3 to 31 µM), but still remained above those thought to limit nitrogen uptake (Cochlan et al, 2002). Xie et al (2015) also did not find a correlation between nutrients and P B m , and suggested that this reflected the lag time between nutrient inputs and phytoplankton growth in the English Channel. They also found a complicated relationship between photosynthetic parameters and temperature and suggested that each functional group had temperature optima that were characterized by specific photosynthetic responses.…”

Section: Controls Of Photosynthesis-irradiance Parametersmentioning

confidence: 85%

“…The macro-environment of the Ross Sea continental shelf changes markedly from spring to summer, with increased temperatures, stronger vertical stratification, shallower mixed layers, decreased macro-and micronutrient concentrations, and an altered assemblage composition . All of these variables have been shown to influence P − E responses in laboratory and field studies (e.g., MacIntyre et al, 2002;Xie et al, 2015), and as such, it is not surprising that the P − E parameters also changed. It is tempting to suggest that the seasonal changes were driven by changes in phytoplankton composition, but we believe that the seasonal changes in oceanographic conditions led to in changes in P − E parameters as well as in composition, and that both oceanographic changes and phytoplankton composition contributed to the seasonal differences in P − E parameters we observed.…”

Section: Overall Patterns Of Photosynthetic Parametersmentioning

confidence: 99%

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Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis

Smith

Donaldson

2015

Biogeosciences

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Abstract.A meta-analysis of photosynthesis-irradiance measurements was completed using data from the Ross Sea, Antarctica, using a total of 417 independent measurements. P B m , the maximum, chlorophyll-specific, irradiancesaturated rate of photosynthesis, averaged 1.1 ± 0.06 µg C (µg Chl) −1 h −1 . Light-limited, chlorophyll-specific photosynthetic rates (α B ) averaged 0.030 ± 0.023 µg C (µg Chl) −1 h −1 (µmol quanta m −2 s −1 ) −1 . Significant variations in P B m and α B were found as a function of season, with spring maximum photosynthetic rates being 60 % greater than those in summer. Similarly, α values were 48 % greater in spring. There was no detectable effect of sampling location on the photosynthetic parameters, and temperature and macronutrient (NO 3 ) concentrations also did not have an influence. However, irradiance and carbon dioxide concentrations, when altered under controlled conditions, exerted significant influences on photosynthetic parameters. Specifically, reduced irradiance resulted in significantly decreased P B m and increased α B values, and increased CO 2 concentrations resulted in significantly increased P B m and α B values. Comparison of photosynthetic parameters derived at stations where iron concentrations were above and below 0.1 nM indicated that reduced iron levels were associated with significantly increased P B m values, confirming the importance of iron within the photosynthetic process. No significant difference was detected between stations dominated by diatoms and those dominated by the haptophyte Phaeocystis antarctica. The meta-analysis confirms the photosynthetic rates predicted from global analyses that are based solely on temperature and irradiance availability, but suggests that, for more accurate predictions of productivity in polar systems, a more detailed model that includes temporal effects of photosynthetic parameters will be required.

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Section: Controls Of Photosynthesis-irradiance Parametersmentioning

confidence: 85%

Section: Overall Patterns Of Photosynthetic Parametersmentioning

confidence: 99%

Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis

Smith

Donaldson

2015

Biogeosciences

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“…New parameterisation of photosynthetic parameters based on size classes (Uitz et al, 2008) and/or temperature specific relationships at L4 (e.g. Xie et al, 2015) may therefore improve these relationships, but require further testing in coastal waters.…”

Section: Dependence Of Primary Production On Abiotic Factorsmentioning

confidence: 99%

Temporal variability in total, micro- and nano-phytoplankton primary production at a coastal site in the Western English Channel

Barnes

Tilstone

Suggett

et al. 2015

Progress in Oceanography

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“…It would be difficult to evaluate the nutrient effect on photosynthetic parameters without C: Chl ratios. In field observations, P m B has been reported to be not correlated to nutrient in the polar and temperate regions (Smith Jr. and Donaldson 2015;Xie et al 2015). In this study, like temperature, total inorganic nitrogen showed a strong gradient from the coast to the open ocean (25 to 1 μM; Fig.…”

Section: Effect Of Temperature and Nutrient On P M Bmentioning

confidence: 48%

“…P m B is often described as a function of temperature (Eppley 1972;Côté and Platt 1983;Behrenfeld and Falkowski 1997). However, P m B to temperature exhibited a hyperbolic response, with an initial linear increase at lower temperature and reaching to a plateau at higher temperature, has been observed in the polar and temperate areas (Li et al 1984;Smith Jr. and Donaldson 2015;Xie et al 2015). The complicated relationship between the temperature and P m B was considered due to the combination of specific photosynthetic responses to temperature.…”

Section: Effect Of Temperature and Nutrient On P M Bmentioning

confidence: 99%

Mixing control on the photosynthesis-irradiance relationship and an estimate of primary production in the winter of the East China Sea

Gong¹,

Chen²,

You³

2017

Terr. Atmos. Ocean. Sci.

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The response of marine phytoplankton primary productivity to available light (photosynthesis-irradiance relationship, P B -E curve) is the principle physiology of plant that is particularly important in the estimation of primary production and in physicalbiogeochemical modeling. In this study, we conducted on-board incubation experiments to examine photosynthesis-irradiance relationships in samples collected from the subtropical shelf of the East China Sea during a winter cruise. Depth and spatial variation of the maximum photosynthesis rate normalized to chlorophyll a ( P m B ) and the initial slope (α) of the P B -E curve parameters were insignificant in the East China Sea. The vertical homogeneity was due to the strong winter mixing. However, spatial homogeneity could be possibly caused by different factors. With relatively low solar radiation in the winter, strong vertical mixing deteriorated light dose and may lead to homogeneously low photosynthetic parameters. In addition, differential inhibitions by temperature and nutrient availability may potentially cause the spatial homogeneity.The mean values of P m B and α were 2.82 ± 0.50 gC (gChl) -1 h -1 and 0.010 ± 0.002 gC (gChl) -1 h -1 (μmol photons m -2 s -1 ) -1 , respectively. Using the photosynthetic-irradiance model (P B -E curve model), the estimated value of shelf-averaged euphotic zone integrated primary production was 186 ± 117 mgC m -2 d -1 . With an overestimate of satellite-derived primary production, field observations will be required.

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Effect of increases in temperature and nutrients on phytoplankton community structure and photosynthesis in the western English Channel

Cited by 32 publications

References 62 publications

Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis

Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis

Temporal variability in total, micro- and nano-phytoplankton primary production at a coastal site in the Western English Channel

Mixing control on the photosynthesis-irradiance relationship and an estimate of primary production in the winter of the East China Sea

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