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Biomass and composition of protistan grazers and heterotrophic bacteria in the Costa Rica Dome during summer 2010
Freibott, Alexandra1; Taylor, Andrew G.1; Selph, Karen E.2; Liu, Hongbin3; Zhang, Wuchang4; Landry, Michael R.1
2016-03-01
Source PublicationJOURNAL OF PLANKTON RESEARCH
Volume38Issue:2Pages:230-243
SubtypeArticle
AbstractWe investigated biomass and composition of heterotrophic microbes in the Costa Rica Dome during June-July 2010 as part of a broader study of plankton trophic dynamics. Because picophytoplankton (, 2 mm) are known to dominate in this unique upwelling region, we hypothesized tight biomass relationships between size-determined predator-prey pairs (i.e. picoplankton-nano-grazers, nanoplankton-micro-grazers) within the microbial community. Integrated biomass of heterotrophic bacteria ranged from 180 to 487 mg C m(-2) and was significantly correlated with total autotrophic carbon. Heterotrophic protist (H-protist) biomass ranged more narrowly from 488 to 545 mg C m(-2), and was comprised of 60% dinoflagellates, 30% other flagellates and 11% ciliates. Nano-sized (<20 mu m) protists accounted for the majority (57%) of grazer biomass and were positively correlated with picoplankton, partially supporting our hypothesis, but nanoplankton and micro-grazers (>20 mu m) were not significantly correlated. The relative constancy of H-protist biomass among locations despite clear changes in integrated autotrophic biomass, Chl a, and primary production suggests that mesozooplankton may exert a tight top-down control on micro-grazers. Biomass-specific consumption rates of phytoplankton by protistan grazers suggest an instantaneous growth rate of 0.52 day(-1) for H-protists, similar to the growth rate of phytoplankton and consistent with a trophically balanced ecosystem dominated by piconanoplankton interactions.
KeywordHeterotrophic Protists Microzooplankton Nanozooplankton Community Composition
DOI10.1093/plankt/fbv107
Indexed BySCI
Language英语
WOS IDWOS:000372874300005
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/126249
Collection海洋生态与环境科学重点实验室
Affiliation1.Univ Calif San Diego, Scripps Inst Oceanog, 9500 Gilman Dr, La Jolla, CA 92093 USA
2.Univ Hawaii Manoa, Dept Oceanog, Honolulu, HI 96822 USA
3.Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China
4.Chinese Acad Sci, Inst Oceanog, Qingdao, Peoples R China
Recommended Citation
GB/T 7714
Freibott, Alexandra,Taylor, Andrew G.,Selph, Karen E.,et al. Biomass and composition of protistan grazers and heterotrophic bacteria in the Costa Rica Dome during summer 2010[J]. JOURNAL OF PLANKTON RESEARCH,2016,38(2):230-243.
APA Freibott, Alexandra,Taylor, Andrew G.,Selph, Karen E.,Liu, Hongbin,Zhang, Wuchang,&Landry, Michael R..(2016).Biomass and composition of protistan grazers and heterotrophic bacteria in the Costa Rica Dome during summer 2010.JOURNAL OF PLANKTON RESEARCH,38(2),230-243.
MLA Freibott, Alexandra,et al."Biomass and composition of protistan grazers and heterotrophic bacteria in the Costa Rica Dome during summer 2010".JOURNAL OF PLANKTON RESEARCH 38.2(2016):230-243.
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