Journal article
Growth‐dependent changes in elemental stoichiometry and macromolecular allocation in the coccolithophore Emiliania huxleyi under different environmental conditions
Limnology and Oceanography, Vol.66(8), pp.2999-3009
08/2021
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Abstract
The growth rate hypothesis (GRH) posits an increase in ribosomal ribonucleic acid (RNA) content, and therefore cellular phosphorus (P), with increasing growth rate. There is evidence that the GRH may not apply to phytoplankton under all conditions. Here, we experimentally controlled four conditions (light, temperature, pH, and CO2) to alter the growth rate of Emiliania huxleyi, a biogeochemically important coccolithophorid, and monitored changes in RNA, protein, and carbohydrate content. We show that an increase in growth rate caused by increasing light, pH, and CO2 resulted in increased RNA per unit of organic carbon (RNA : POC), but that increasing temperature, leading to increase of growth rate, resulted in a decrease in RNA : POC. Protein per unit of organic carbon (protein : POC) increased in our increased temperature, pH, and CO2 treatments that increased growth rate, but there was little change in protein : POC in our light treatment despite it inducing the same increase in growth rate. Carbohydrate per unit of organic carbon (Carbohydrate : POC) increased with growth rate under increased light and CO2 but did not vary significantly in the temperature or pH treatments. These results indicate that physiological acclimation to specific environmental conditions can lead to contrasting patterns in RNA, protein, and carbohydrate composition and therefore contrasting changes in carbon : nitrogen : phosphorus ratios with growth rate in E. huxleyi.
Details
- Title
- Growth‐dependent changes in elemental stoichiometry and macromolecular allocation in the coccolithophore Emiliania huxleyi under different environmental conditions
- Creators
- Yong Zhang - Fujian Normal UniversityZhengke Li - Dalhousie UniversityKai G Schulz - Southern Cross UniversityYingyu Hu - Dalhousie UniversityAndrew J Irwin - Dalhousie UniversityZoe V Finkel - Dalhousie University
- Publication Details
- Limnology and Oceanography, Vol.66(8), pp.2999-3009
- Publisher
- John Wiley & Sons, Inc.
- Grant note
- This work was supported by the National Natural Science Foundation of China (41806129 [Y.Z.], 32001180 [Z.K.L.]) and the Canada Research Chairs program (Z.V.F.), and grants from the Simons Collaboration on Computational Biogeochemical Modeling of Marine Ecosystems/CBIOMES (Grant IDs: 549937 [Z.V.F.], 549935 [A.J.I.]). Funding was also provided by the Natural Sciences and Engineering Research Council of Canada (NSERC).
- Identifiers
- 991012948578102368
- Copyright
- © 2021 Association for the Sciences of Limnology and Oceanography.
- Academic Unit
- Faculty of Science and Engineering; School of Environment, Science and Engineering; Centre for Coastal Biogeochemistry; Science
- Language
- English
- Resource Type
- Journal article