Vertically structured prokaryotic community can control the efficiency of the biological pump in the oceans

Takeshi Miki, Luca Giuggioli, Yutaka Kobayashi, Toshi Nagata, Simon Asher Levin

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Despite recent advances in molecular and metagenomic approaches, it is still unclear how spatiotemporal variations in microbial communities influence the biological pump, exporting organic carbon from the surface to the deep oceans. We address this important problem by constructing a simple model of a prokaryotic metacommunity in which two generalist ecotypes compete for two resources. The first and the second ecotypes have, respectively, a higher preference for particulate organic carbon (POC) and dissolved organic carbon. Sinking of POC would lead to a higher abundance of the first ecotype in the deep layer compared to the surface layer, but vertical mixing in turn generates a net upward flux of this ecotype to the surface layer. This upward movement accelerates the shifts in the community composition during the phytoplankton bloom, contributing to a higher efficiency in POC remineralization at the surface layer and reducing the carbon flux to the deep layer.

Original languageEnglish (US)
Pages (from-to)199-216
Number of pages18
JournalTheoretical Ecology
Volume2
Issue number4
DOIs
StatePublished - Dec 1 2009

All Science Journal Classification (ASJC) codes

  • Ecology
  • Ecological Modeling

Keywords

  • Carbon cycling
  • Heterotrophic prokaryotes
  • Metacommunity
  • Vertical mixing and sinking

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