DOI: 10.1002/2015GB005090
Scopus记录号: 2-s2.0-84947129466
论文题名: Environmental controls on the biogeography of diazotrophy and Trichodesmium in the Atlantic Ocean
作者: Snow J ; T ; , Schlosser C ; , Woodward E ; M ; S ; , Mills M ; M ; , Achterberg E ; P ; , Mahaffey C ; , Bibby T ; S ; , Moore C ; M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 6 起始页码: 865
结束页码: 884
语种: 英语
英文关键词: iron
; nitrogen fixation
; nutrient stress
; phosphorus
; resource ratio
; trichodesmium
Scopus关键词: biogeography
; community structure
; concentration (composition)
; cyanobacterium
; environmental conditions
; global ocean
; iron
; nitrogen fixation
; nutrient dynamics
; partial pressure
; phosphorus
; sea surface temperature
; Atlantic Ocean
; Atlantic Ocean (South)
; Trichodesmium
英文摘要: The cyanobacterium Trichodesmium is responsible for a significant proportion of the annual "new" nitrogen introduced into the global ocean. Despite being arguably the best studied marine diazotroph, the factors controlling the distribution and growth of Trichodesmium remain a subject of debate, with sea surface temperature, the partial pressure of CO2, and nutrients including iron (Fe) and phosphorus (P), all suggested to be important. Synthesizing data from seven cruises collectively spanning large temporal and spatial scales across the Atlantic Ocean, including two previously unreported studies crossing the largely undersampled South Atlantic gyre, we assessed the relationship between proposed environmental drivers and both community N2 fixation rates and the distribution of Trichodesmium. Simple linear regression analysis would suggest no relationship between any of the sampled environmental variables and N2 fixation rates. However, considering the concentrations of iron and phosphorus together within a simplified resource-ratio framework, illustrated using an idealized numerical model, indicates the combined effects these nutrients have on Trichodesmium and broader diazotroph biogeography, alongside the reciprocal maintenance of different biogeographic provinces of the (sub)tropical Atlantic in states of Fe or P oligotrophy by diazotrophy. The qualitative principles of the resource-ratio framework are argued to be consistent with both the previously described North-South Atlantic contrast in Trichodesmium abundance and the presence and consequence of a substantial non-Trichodesmium diazotrophic community in the western South Atlantic subtropical gyre. A comprehensive, observation-based explanation of the interactions between Trichodesmium and the wider diazotrophic community with iron and phosphorus in the Atlantic Ocean is thus revealed. © 2015. 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/78024
Appears in Collections: 气候变化事实与影响
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作者单位: Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, United Kingdom; GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, Germany; Plymouth Marine Laboratory, Plymouth, United Kingdom; Department of Earth System Science, Stanford University, Stanford, CA, United States; Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom
Recommended Citation:
Snow J,T,, Schlosser C,et al. Environmental controls on the biogeography of diazotrophy and Trichodesmium in the Atlantic Ocean[J]. Global Biogeochemical Cycles,2015-01-01,29(6)