气候变化领域集成服务门户(CCPortal): The Influence of Plankton Community Structure on Sinking Velocity and Remineralization Rate of Marine Aggregates

CCPortal

DOI	10.1029/2019GB006256
	The Influence of Plankton Community Structure on Sinking Velocity and Remineralization Rate of Marine Aggregates
	Bach L.T.; Stange P.; Taucher J.; Achterberg E.P.; Algueró-Muñiz M.; Horn H.; Esposito M.; Riebesell U.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	971
结束页码	994
卷号	33 期号:8
英文摘要	Gravitational sinking of photosynthetically fixed particulate organic carbon (POC) constitutes a key component of the biological carbon pump. The fraction of POC leaving the surface ocean depends on POC sinking velocity (SV) and remineralization rate (Cremin), both of which depend on plankton community structure. However, the key drivers in plankton communities controlling SV and Cremin are poorly constrained. In fall 2014, we conducted a 6-week mesocosm experiment in the subtropical NE Atlantic Ocean to study the influence of plankton community structure on SV and Cremin. Oligotrophic conditions prevailed for the first 3 weeks, until nutrient-rich deep water injected into all mesocosms stimulated diatom blooms. SV declined steadily over the course of the experiment due to decreasing CaCO3 ballast and—according to an optical proxy proposed herein—due to increasing aggregate porosity mostly during an aggregation event after the diatom bloom. Furthermore, SV was positively correlated with the contribution of picophytoplankton to the total phytoplankton biomass. Cremin was highest during a Synechococcus bloom under oligotrophic conditions and in some mesocosms during the diatom bloom after the deep water addition, while it was particularly low during harmful algal blooms. The temporal changes were considerably larger in Cremin (max. fifteenfold) than in SV (max. threefold). Accordingly, estimated POC transfer efficiency to 1,000 m was mainly dependent on how the plankton community structure affected Cremin. Our approach revealed key players and interactions in the plankton food web influencing POC export efficiency thereby improving our mechanistic understanding of the biological carbon pump. © 2019. The Authors.
英文关键词	biological pump; carbon export; degradation; mesocosm; respiration; sinking speed
语种	英语
scopus关键词	biological pump; carbon cycle; community structure; deep water; food web; marine environment; mesocosm; oligotrophic environment; particulate organic carbon; phytoplankton; plankton; remineralization; respiration; Atlantic Ocean; Atlantic Ocean (Northeast); algae; Bacillariophyta; Synechococcus
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/129721
作者单位	Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; GEOMAR Helmholtz Centre of Ocean Research Kiel, Kiel, Germany; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Biologische Anstalt Helgoland, Helgoland, Germany; NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, Yerseke, Netherlands
推荐引用方式 GB/T 7714	Bach L.T.,Stange P.,Taucher J.,et al. The Influence of Plankton Community Structure on Sinking Velocity and Remineralization Rate of Marine Aggregates[J],2019,33(8).
APA	Bach L.T..,Stange P..,Taucher J..,Achterberg E.P..,Algueró-Muñiz M..,...&Riebesell U..(2019).The Influence of Plankton Community Structure on Sinking Velocity and Remineralization Rate of Marine Aggregates.Global Biogeochemical Cycles,33(8).
MLA	Bach L.T.,et al."The Influence of Plankton Community Structure on Sinking Velocity and Remineralization Rate of Marine Aggregates".Global Biogeochemical Cycles 33.8(2019).