Rising nutrient-pulse frequency and high UVR strengthen microbial interactions

Cabrerizo, Marco J.; Medina‐Sánchez, Juan Manuel; Dorado-García, Irene; Villar‐Argaiz, Manuel; Carrillo, Presentación

doi:10.1038/srep43615

Cited by 29 publications

(31 citation statements)

References 69 publications

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“…First, our results indicates that Isochrysis galbana has a proportionally greater dependence on photosynthesis than on phagotrophy, in agreement with Cabrerizo et al. (), and Anderson et al. ().…”

Section: Discussionsupporting

confidence: 93%

Mixotrophic trade‐off under warming and UVR in a marine and a freshwater alga

González-Olalla

Medina‐Sánchez

Carrillo

2019

Journal of Phycology

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Mixotrophic protists combine phagotrophy and phototrophy within a single cell. Greater phagotrophic activity could reinforce the bypass of carbon (C) flux through the bacteria‐mixotroph link and thus lead to a more efficient transfer of C and other nutrients to the top of the trophic web. Determining how foreseeable changes in temperature and UVR affect mixotrophic trade‐offs in favor of one or the other nutritional strategy, along the mixotrophic gradient, is key to understanding the fate of carbon and mineral nutrients in the aquatic ecosystem. Our two main hypotheses were: (i) that increased warming and UVR will divert metabolism toward phagotrophy, and (ii) that the magnitude of this shift will vary according to the organism's position along the mixotrophic gradient. To test these hypotheses, we used two protists (Isochrysis galbana and Chromulina sp.) located in different positions on the mixotrophic gradient, subjecting them to the action of temperature and of UVR and their interaction. Our results showed that the joint action of these two factors increased the primary production:bacterivory ratio and stoichiometric values (N:P ratio) close to Redfield's ratio. Therefore, temperature and UVR shifted the metabolism of both organisms toward greater phototrophy regardless of the original position of the organism on the mixotrophic gradient. Weaker phagotrophic activity could cause a less efficient transfer of C to the top of trophic webs.

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Section: Discussionsupporting

confidence: 93%

Mixotrophic trade‐off under warming and UVR in a marine and a freshwater alga

González-Olalla

Medina‐Sánchez

Carrillo

2019

Journal of Phycology

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“…Second, we also suggest that having a larger catchment could be a configuration favoring more frequent pulses of P in lakes via permanent tributaries (either organic or inorganic) that could also lead to the prevalence of mixotrophs provided that P supply remains under a given threshold. Field survey and experimental studies conducted in lake La Caldera in the Spanish Sierra Nevada show a consistent response pattern with the prevalence of mixotroph under low but frequent inorganic nutrient inputs, whereas photoautotrophs responded to high inorganic nutrient inputs, denoting the differential growth strategy that both groups adopted with the nutrient-input schedule (Cabrerizo et al, 2017).…”

Section: Catchment Influence On Functional Diversitymentioning

confidence: 66%

Effects of catchment area and nutrient deposition regime on phytoplankton functionality in alpine lakes

Jacquemin

Bertrand

Franquet

et al. 2019

Science of The Total Environment

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High mountain lakes are a network of sentinels, sensitive to any events occurring within their waterbodies, their surrounding catchment and their airshed. In this paper, we investigate how catchments impact the taxonomic and functional composition of phytoplankton communities in high mountain lakes, and how this impact varies according to the atmospheric nutrient deposition regime. For two years, we sampled the post snow-melt and the late summer phytoplankton, with a set of biotic and abiotic parameters, in six French alpine lakes with differing catchments (size and vegetation cover) and contrasting nitrogen (N) and phosphorus (P) deposition regimes. Whatever the nutrient deposition regime, we found that the lakes with the smallest rocky catchments showed the lowest functional richness of phytoplankton communities. The lakes with larger vegetated catchments were characterized by the coexistence of phytoplankton taxa with more diverse strategies in the acquisition and utilization of nutrient resources. The nutrient deposition regime appeared to interact with catchment characteristics in determining which functional groups ultimately developed in lakes. Photoautotroph taxa dominated the phytoplankton assemblages under high NP deposition regime while mixotroph taxa were even more favored in lakes with large vegetated catchments under low NP deposition regime. Phytoplankton functional changes were likely related to the leaching of terrestrial organic matter from catchments evidenced by analyses of carbon (δ 13 C) and nitrogen (δ 15 N) stable isotope ratios in seston and zooplankton. Plankton δ 15 N values indicated greater water-soil interaction in lakes with larger vegetated catchments, while δ 13 C values indicated the effective mineralization of the organic matter in lakes. There is even more reason to consider the role played by catchments when seeking to determine the vulnerability of high altitude lakes to future changes, as catchments' own properties will vary under changes related to climate and airborne contaminants.

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“…Mixotrophic plankton were less affected by UV radiation in a scenario with a series of smaller dust events vs a single large pulse. 31 Phytoplankton from very low nutrient waters in the coastal Mediterranean Sea were affected synergistically or antagonistically by UV radiation and phosphorus. 34 The interactive effects of UV radiation and phosphorus were positive on photosynthesis, but adverse on overall primary production and phytoplankton biomass because the addition of phosphorus allowed the inhibitory effect of UV radiation to be more fully expressed.…”

Section: Effects Of Uv Radiation Are Modulated By Nutrientsmentioning

confidence: 99%