Document Type

Article

Publication Date

3-2016

DOI

10.1093/plankt/fbw018

Publication Title

Journal of Plankton Research

Volume

38

Issue

2

Pages

244-255

Abstract

The Costa Rica Dome (CRD) is a wind-driven feature characterized by high primary production and an unusual cyanobacterial bloom in surface waters. It is not clear whether this bloom arises from top-down or bottom-up processes. Several studies have argued that trace metal geochemistry within the CRD contributes to the composition of the phytoplankton assemblages, since cyanobacteria and eukaryotic phytoplankton have different transition metal requirements. Here, we report that total dissolved zinc (Zn) is significantly depleted relative to phosphate (P) and silicate (Si) within the upper water column of the CRD compared with other oceanic systems, and this may create conditions favorable for cyanobacteria, which have lower Zn requirements than their eukaryotic competitors. Shipboard grow-out experiments revealed that while Si was a limiting factor under our experimental conditions, additions of Si and either iron (Fe) or Zn led to higher biomass than Si additions alone. The addition ofFe and Zn alone did not lead to significant enhancements. Our results suggest that the depletion of Zn relative to P in upwelled waters may create conditions in the near-surface waters that favor phytoplankton with low Zn requirements, including cyanobacteria.

Comments

Web of Science: "Free full-text from publisher."

© The Author 2016. Published by Oxford University Press. All rights reserved.

Original Publication Citation

Chappell, P. D., Vedmati, J., Selph, K. E., Cyr, H. A., Jenkins, B. D., Landry, M. R., & Moffett, J. W. (2016). Preferential depletion of zinc within Costa Rica upwelling dome creates conditions for zinc co-limitation of primary production. Journal of Plankton Research, 38(2), 244-255. doi:10.1093/plankt/fbw018

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