Journal article
Low temperature sensitivity of picophytoplankton P: B ratios and growth rates across a natural 10°C temperature gradient in the oligotrophic Indian Ocean
Limnology and Oceanography Letters, Vol.7(2), pp.112-121
2022
Abstract
We investigated temperature sensitivities of picophytoplankton growth along a natural 10°C (18–28°C) temperature gradient in the eastern Indian Ocean characterized by deep mixing and consistently low dissolved nitrogen. Population biomass (B), cell carbon, and chlorophyll were measured by flow cytometry. Instantaneous growth (μ) and production (P) were calculated from dilution incubations at four light levels. Contrary to most empirical and theoretical predictions, Prochlorococcus, the biomass dominant, showed insignificant temperature sensitivity, with nominal Q10 values of 1.06 and 1.18 for P : B and μ, respectively, and activation energies (Ea) of 0.05 and 0.12 eV. Q10 and Ea values for Synechococcus (1.36–1.42 and 0.23–0.27 eV) were also below prediction, and picoeukaryotes showed high variability, including negative rates suggesting lytic cycles, at high temperature. We emphasize the importance of using adapted communities in natural environmental gradients to test climate predictions and hypothesize that mortality defenses are a significant selection criterion in balanced oligotrophic systems.
Details
- Title
- Low temperature sensitivity of picophytoplankton P: B ratios and growth rates across a natural 10°C temperature gradient in the oligotrophic Indian Ocean
- Authors/Creators
- M.R. Landry (Author/Creator) - Scripps Institution of OceanographyK.E. Selph (Author/Creator) - University of Hawaiʻi at MānoaR.R. Hood (Author/Creator) - University of Maryland Center for Environmental ScienceC.H. Davies (Author/Creator) - CSIRO Oceans and AtmosphereL.E. Beckley (Author/Creator) - Murdoch University
- Publication Details
- Limnology and Oceanography Letters, Vol.7(2), pp.112-121
- Publisher
- Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography
- Identifiers
- 991005540871107891
- Copyright
- © 2021 The Authors.
- Murdoch Affiliation
- School of Environmental and Conservation Sciences
- Language
- English
- Resource Type
- Journal article
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
Metrics
20 File views/ downloads
46 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.2 Marine Biology
- 3.2.154 Phytoplankton Dynamics
- Web Of Science research areas
- Limnology
- Marine & Freshwater Biology
- Oceanography
- ESI research areas
- Geosciences