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• W2332391245 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 421:13-24 (2011) - DOI: https://doi.org/10.3354/meps08792 Decoupled phytoplankton growth and microzooplankton grazing in the deep euphotic zone of the eastern equatorial Pacific Michael R. Landry1,*, Karen E. Selph2, Eun Jin Yang3 1Scripps Institution of Oceanography, University of California at San Diego, La Jolla California 92093-0227, USA 2Department of Oceanography, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA 3Division of Polar Climate Research, Korea Polar Research Institute, KORDI, Songdo Techno Park, Songdo, Yeonsu, Incheon 406-840, South Korea *Email: mlandry@ucsd.edu ABSTRACT: We conducted dilution depth-profile experiments in the eastern equatorial Pacific (EEP) to define regional characteristics of phytoplankton growth and microzooplankton grazing and to test the hypothesis that the process rates decouple in the deep euphotic zone where growth is negligible. We used an abbreviated 2-treatment dilution protocol to produce daily profiles at 8 depths of phytoplankton growth, microzooplankton grazing and cellular changes in chlorophyll a (chl a) content from surface waters to the 0.1% light depth. Experiments were conducted at 16 stations from 2°N to 4°S at 110°W and from 110° to 140°W along the equator. Results were surprisingly robust and coherent over this broad spatial area and showed a euphotic zone essentially divided into 3 equal depth intervals. Mean (±SD) growth rates (0.83 ± 0.16 d–1) exceeded grazing rates (0.42 ± 0.15 d–1) in the light-saturated upper third of the water column. Growth, and to a lesser extent grazing, declined with light in the middle third. Effective cell growth was negligible (0.02 ± 0.21 d–1) in the lower third (1 to 0.1% of surface irradiance), with grazing (0.18 ± 0.17 d–1) exceeding growth in this layer. The deep euphotic zone accounted for 25.4 ± 8.4% of the total euphotic zone chl a, 0.5 ± 7.8% of depth-integrated phytoplankton growth and 12.7 ± 7.2% of depth-integrated microzooplankton grazing on phytoplankton. The decoupling of growth and grazing processes under low light conditions at the base of the euphotic zone substantially affected our estimates of microzooplankton consumption of phytoplankton, which ranged from 51% of daily chlorophyll growth for experiments conducted in the upper euphotic zone to 69% for the depth-integrated euphotic zone. In addition, the excess of grazing over growth processes in the deepest stratum, which is typically overlooked in experimental studies, suggests that protistan grazers may have a much larger role in biogeochemical transformations of export fluxes than previously appreciated. KEY WORDS: Microzooplankton grazing · Phytoplankton growth rate · Lower euphotic zone · Equatorial Pacific Full text in pdf format PreviousNextCite this article as: Landry MR, Selph KE, Yang EJ (2011) Decoupled phytoplankton growth and microzooplankton grazing in the deep euphotic zone of the eastern equatorial Pacific. Mar Ecol Prog Ser 421:13-24. https://doi.org/10.3354/meps08792 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 421. Online publication date: January 17, 2011 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2011 Inter-Research." @default.
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• W2332391245 title "Decoupled phytoplankton growth and microzooplankton grazing in the deep euphotic zone of the eastern equatorial Pacific" @default.
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