Inter-Research > MEPS > v509 > p87-101  
MEPS
Marine Ecology Progress Series

via Mailchimp

MEPS 509:87-101 (2014)  -  DOI: https://doi.org/10.3354/meps10895

Size-specific growth and grazing rates for picophytoplankton in coastal and oceanic regions of the eastern Pacific

Darcy A. A. Taniguchi1,*, Michael R. Landry1, Peter J. S. Franks1, Karen E. Selph2

1Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, USA
2Department of Oceanography, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
*Corresponding author:

ABSTRACT: Estimates of growth and grazing mortality rates for different size classes and taxa of natural picophytoplankton assemblages were measured in mixed-layer experiments conducted in 3 regions of the eastern Pacific: the California Current Ecosystem, Costa Rica Dome, and equatorial Pacific. Contrary to expectation, size-dependent rates for cells between 0.45 and 4.0 µm in diameter showed no systematic trends with cell size both in and among regions. For all size classes, mean ± SD growth rates ranged from -0.70 ± 0.17 to 0.83 ± 0.13 d-1 and grazing rates between -0.07 ± 0.13 and 1.17 ± 0.10 d-1. Taxon-specific growth rates for Prochlorococcus ranged from 0.17 ± 0.12 to 0.59 ± 0.01 d-1, for Synechococcus from 0.68 ± 0.03 to 0.97 ± 0.04 d-1, for picoeukaryotes from 0.46 ± 0.13 to 1.03 ± 0.06 d-1, and for all cells combined between 0.45 ± 0.03 and 0.65 ± 0.02 d-1. For grazing, Prochlorococcus rates ranged between 0.02 ± 0.12 and 0.66 ± 0.02 d-1, Synechococcus rates between 0.24 ± 0.08 and 0.92 ± 0.05 d-1, for picoeukaryotes between 0.19 ± 0.10 and 0.78 ± 0.09 d-1, and for all cells between 0.16 ± 0.05 and 0.75 ± 0.02 d-1. When comparing rates among taxa, only Prochlorococcus had consistently lower rates than Synechococcocus in all regions. No other trends were apparent. Temperature relationships based on the Metabolic Theory of Ecology were able to explain more of the variability among grazing rates than among growth rates for each taxon considered.


KEY WORDS: Size-specific rates · California Current Ecosystem · Costa Rica Dome · Equatorial Pacific · Prochlorococcus · Synechococcus · Picoeukaryotes


Full text in pdf format 
Cite this article as: Taniguchi DAA, Landry MR, Franks PJS, Selph KE (2014) Size-specific growth and grazing rates for picophytoplankton in coastal and oceanic regions of the eastern Pacific. Mar Ecol Prog Ser 509:87-101. https://doi.org/10.3354/meps10895

Export citation
Mail this link - Contents Mailing Lists - RSS
Facebook - - linkedIn