Physiological and biochemical responses of diatoms to projected ocean changes

Xu, Juntian; Gao, Kunshan; Li, Yahe; Hutchins, David A.

doi:10.3354/meps11026

Cited by 19 publications

(10 citation statements)

References 55 publications

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“…Although the underling mechanism for explaining lower P:C at higher temperature is not fully understood, there are three hypotheses (Paul et al, 2015): (1) increase in metabolic stimulation of inorganic carbon uptake over phosphorus uptake; (2) increase in nutrient use efficiency which enables greater carbon fixation for given nutrient availability; and (3) "translation compensation theory," which predicts that less P-rich ribosomes are required for protein synthesis and growth as the translation process becomes kinetically more efficient (McKew et al, 2015;Toseland et al, 2013;Woods et al, 2003;Xu et al, 2014;Zhu et al, 2017). In this meta-analysis, the decrease in P:C in cyanobacteria at elevated temperatures (Fig.…”

Section: Temperaturementioning

confidence: 99%

A meta-analysis on environmental drivers of marine phytoplankton C : N : P

Tanioka¹,

Matsumoto²

2019

Preprint

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Abstract. The elemental stoichiometry of marine phytoplankton plays a critical role in the global carbon cycle through carbon export. Although extensive laboratory experiments have been carried out over the years to assess the influence of different environmental drivers on the elemental composition of phytoplankton, a comprehensive quantitative assessment of the processes is still lacking. Here, we synthesized the responses of P : C and N : C ratios of marine phytoplankton to five major drivers (phosphate and nitrate, irradiance, temperature, and iron) by meta-analysis of laboratory experimental data available in the literature. Our results show that the response of the ratios to changes in macronutrients is consistent across all the studies, where the nutrient availability is positively related to changes in P : C and N : C ratios. We found that diatoms are more sensitive to the changes in macronutrients compared to other eukaryotes and cyanobacteria, possibly due to their larger cell size and their abilities to quickly regulate their gene expression patterns required for nutrient uptake. The effect of irradiance on P : C was mixed and not significant, but the same effect on N : C was significant and constant across all studies where an increase in irradiance decreased N : C. The response to temperature changes was mixed by species, except warming consistently decreased P : C ratio in cyanobacteria. This may explain why P : C is consistently low in the cyanobacteria-dominated subtropical oceans. The effect of iron on P : C and N : C for cyanobacteria were statistically significant but the small sample size precludes drawing firm conclusions. Overall, our findings highlight the high stoichiometric plasticity of diatoms and the importance of macronutrients in determining P : C and N : C ratios, which both provide us insights on how to understand and model plankton diversity and productivity.

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Section: Temperaturementioning

confidence: 99%

A meta-analysis on environmental drivers of marine phytoplankton C : N : P

Tanioka¹,

Matsumoto²

2019

Preprint

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“…Yet, in the diatom C. debilis, under dynamic light, elevated pCO 2 decreased primary production (Hoppe et al, 2015). Experiments on multiple stressors including not only pCO 2 and light, but also temperature, nutrients and iron, found that light increased growth, when nutrients were not limiting, while pCO 2 did not have any effect (Xu et al, 2014;Boyd et al, 2015a). There are great differences in the definition of high and potentially stressful irradiances that are used in studies investigating effects of constant irradiances in temperate and Antarctic phytoplankton species (125 to 380 µmol photons m −2 s −1 ; Kropuenske et al, 2010;Mills et al, 2010;Norici et al, 2011;Hoogstraten et al, 2012).…”

Section: Introductionmentioning

confidence: 97%

Light Intensity Modulates the Response of Two Antarctic Diatom Species to Ocean Acidification

2016

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“…Increasing attention is devoted to the interplay between MEDs on phytoplankton under the projected climate change scenarios (Xu et al, 2014a;Boyd et al, 2015;Flynn et al, 2015). To date, studies have focused on two concurrent variables (Rhee and Gotham, 1981;Staehr and Sand-Jensen, 2006;Sommer et al, 2015), while a few have examined three-way (Feng et al, 2008;Shi et al, 2015) or multi-way interactive effects of environmental factors (Xu et al, 2014b;Brennan and Collins, 2015).…”

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confidence: 99%

Environmental dependence of the correlations between stoichiometric and fatty acid‐based indicators of phytoplankton nutritional quality

Ismar

Sommer

et al. 2016

Limnology & Oceanography

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Marine phytoplankton is simultaneously affected by multiple environmental drivers. To‐date integrative assessments of multiple combined effects are rare on the relationship between elemental stoichiometry and biochemicals in marine phytoplankton. We investigated responses of stoichiometric (N:C and P:C ratios) and fatty acid‐based (polyunsaturated fatty acid, PUFA) indicators of nutritional quality to three N:P supply ratios (10:1, 24:1, and 63:1 mol mol−1), three temperatures (12, 18, and 24°C) and two pCO2 levels (560 and 2400 μatm) in the marine phytoplankters Rhodomonas sp. and Phaeodactylum tricornutum. Overall, warming and nutrient deficiency showed dramatic effects, but increased pCO2 had modest effects on the two indicators of nutritional quality. Specifically, warming showed strong positive effects on N:C and P:C ratios in Rhodomonas sp. but negative effects on PUFAs in both species. The low N‐ and low P‐media led to low contents of both nutrients but high contents of PUFAs in the biomass of Rhodomonas sp., while the response of P. tricornutum was more complex: N:C ratios were lowest at the intermediate N:P supply but P:C ratios responded negatively to P deficiency and positively to N deficiency. Large variations in the two indicators of nutritional quality can be attributed to species‐specific physiological optima and interactions between the three manipulated variables. Our results suggest that stoichiometric and FA‐based indicators of nutritional quality may change differentially in response to warming and nutrient deficiency in marine phytoplankton, highlighting the relevance of simultaneous considerations of the two indicators of nutritional quality, when assessing food web dynamics under future ocean scenarios.

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Physiological and biochemical responses of diatoms to projected ocean changes

Cited by 19 publications

References 55 publications

A meta-analysis on environmental drivers of marine phytoplankton C : N : P

A meta-analysis on environmental drivers of marine phytoplankton C : N : P

Light Intensity Modulates the Response of Two Antarctic Diatom Species to Ocean Acidification

Environmental dependence of the correlations between stoichiometric and fatty acid‐based indicators of phytoplankton nutritional quality

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