气候变化领域集成服务门户(CCPortal): Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre

CCPortal

DOI	10.1002/2017GB005785
	Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre
	Valencia B.; Décima M.; Landry M.R.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	289
结束页码	305
卷号	32 期号:2
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.
英文关键词	active flux; mesozooplankton; passive flux; size structure; station ALOHA
语种	英语
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
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129857
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
推荐引用方式 GB/T 7714	Valencia B.,Décima M.,Landry M.R.. Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre[J],2018,32(2).
APA	Valencia B.,Décima M.,&Landry M.R..(2018).Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre.Global Biogeochemical Cycles,32(2).
MLA	Valencia B.,et al."Environmental Effects on Mesozooplankton Size Structure and Export Flux at Station ALOHA, North Pacific Subtropical Gyre".Global Biogeochemical Cycles 32.2(2018).