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Phytoplankton traits from long-term oceanographic time-series

Crispin M Mutshinda, View ORCID ProfileZoe V Finkel, Claire E Widdicombe, View ORCID ProfileAndrew J Irwin
doi: https://doi.org/10.1101/148304
Crispin M Mutshinda
1Mathematics & Computer Science, Mount Allison University, Sackville, NB, Canada, E4L 1E6
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Zoe V Finkel
2Environmental Science, Mount Allison University, Sackville, NB, Canada, E4L 1A7
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Claire E Widdicombe
3Plymouth Marine Laboratory, Prospect Place, Plymouth, UK, PL1 3DH
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Andrew J Irwin
1Mathematics & Computer Science, Mount Allison University, Sackville, NB, Canada, E4L 1E6
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  • ORCID record for Andrew J Irwin
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Abstract

Trait values are usually extracted from laboratory studies of single phytoplankton species, which presents challenges for understanding the immense diversity of phytoplankton species and the wide range of dynamic ocean environments. Here we use a Bayesian approach and a trait-based model to extract trait values for four functional types and ten diatom species from field data collected at Station L4 in the Western Channel Observatory. We find differences in maximum net growth rate, temperature optimum and sensitivity, half-saturation constants for light and nitrogen, and density-dependent loss terms across the functional types. We find evidence of very high linear loss rates, suggesting that grazing may be even more important than commonly assumed and differences in density-dependent loss rates across functional types, indicating the presence of strong niche differentiation among functional types. Low half-saturation constants for nitrogen at the functional type level may indicate widespread mixotrophy. At the species level, we find a wide range of density-dependent effects, which may be a signal of diversity in grazing susceptibility or biotic interactions. This approach may be a way to obtain more realistic and better-constrained trait-values for functional types to be used in ecosystem modeling.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted June 09, 2017.
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Phytoplankton traits from long-term oceanographic time-series
Crispin M Mutshinda, Zoe V Finkel, Claire E Widdicombe, Andrew J Irwin
bioRxiv 148304; doi: https://doi.org/10.1101/148304
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Phytoplankton traits from long-term oceanographic time-series
Crispin M Mutshinda, Zoe V Finkel, Claire E Widdicombe, Andrew J Irwin
bioRxiv 148304; doi: https://doi.org/10.1101/148304

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