DOI: 10.1002/2017GB005785
Scopus记录号: 2-s2.0-85042355582
论文题名: Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre
作者: Valencia B ; , Décima M ; , Landry M ; R
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2018
卷: 32, 期: 2 起始页码: 289
结束页码: 305
语种: 英语
英文关键词: active flux
; mesozooplankton
; passive flux
; size structure
; station ALOHA
Scopus关键词: biomass
; carbon cycle
; environmental conditions
; environmental effect
; flux measurement
; growth rate
; gyre
; oligotrophic environment
; primary production
; protist
; size structure
; species evenness
; subtropical region
; zooplankton
; Pacific Ocean
; Pacific Ocean (North)
; Animalia
; Protista
英文摘要: Using size-fractionated mesozooplankton biomass data collected over 23 years (1994–2016) of increasing primary production (PP) at station ALOHA (A Long-Term Oligotrophic Habitat Assessment), we evaluate how changing environmental conditions affect mesozooplankton size structure, trophic cycling, and export fluxes in the subtropical North Pacific. From generalized additive model analysis, size structure is significantly influenced by a nonlinear relationship with sea surface temperature that is mainly driven by the strong 1997–1998 El Niño and a positive and linear relationship with PP. Increasing PP has more strongly enhanced the biomass of smaller (0.2–0.5 mm) and larger (>5 mm) mesozooplankton, increasing evenness of the biomass spectra, while animals of 2–5 mm, the major size class for vertically migrating mesozooplankton, show no long-term trend. Measured PP is sufficient to meet feeding requirements that satisfy mesozooplankton respiration and growth rates, as determined by commonly used empirical relationships based on animal size and temperature, consistent with a tightly coupled food web with one intermediate level for protistan consumers. Estimated fecal pellet production suggests an enhanced contribution of mesozooplankton to passive particle export relative to the material collected in 150 m sediment traps. In contrast, the biomass of vertically migrants does not vary systematically with PP due to the varying responses of the different size classes. These results illustrate some complexities in understanding how varying environmental conditions can affect carbon cycling and export processes at the community level in open-ocean oligotrophic systems, which need to be confirmed and better understood by process-oriented mechanistic study. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77668
Appears in Collections: 气候变化事实与影响
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; National Institute of Water and Atmospheric Research, Wellington, New Zealand
Recommended Citation:
Valencia B,, Décima M,, Landry M,et al. Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre[J]. Global Biogeochemical Cycles,2018-01-01,32(2)