DOI: 10.1002/2013GB004639
Scopus记录号: 2-s2.0-84887282457
论文题名: Distributions of particulate Heme b in the Atlantic and Southern Oceans - Implications for electron transport in phytoplankton
作者: Gledhill M ; , Achterberg E ; P ; , Honey D ; J ; , Nielsdottir M ; C ; , Rijkenberg M ; J ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 4 起始页码: 1072
结束页码: 1082
语种: 英语
英文关键词: Atlantic Ocean
; biogenic particulate material
; iron
; nutrients
; physiology
; phytoplankton
Scopus关键词: Atlantic Ocean
; Electron transport
; Light-harvesting antennas
; North East Atlantic
; Particulate materials
; Particulate organic carbon
; Physiological response
; Phytoplankton community
; Chlorophyll
; Electron transport properties
; Iron
; Iron compounds
; Nutrients
; Physiological models
; Physiology
; Phytoplankton
; Proteins
; Porphyrins
; community composition
; concentration (composition)
; correlation
; cytochrome
; growth modeling
; physiological response
; phytoplankton
; protein
; Atlantic Ocean
; Iceland Basin
; Eukaryota
英文摘要: Concentrations of heme b, the iron-containing component of b-type hemoproteins, ranged from < 0.4 to 5.3 pM with an average of 1.18 ± 0.8 pM (± 1σ; n = 86) in the Iceland Basin (IB), from < 0.4 to 19.1 pM with an average of 2.24 ± 1.67 pM (n = 269) in the tropical northeast Atlantic (TNA) and from 0.6 to 21 pM with an average of 5.1 ± 4.8 pM (n = 34) in the Scotia Sea (SS). Heme b concentrations were enhanced in the photic zone and decreased with depth. Heme b concentrations correlated positively with chlorophyll a (chl a) in the TNA (r = 0.41, p < 0.01, n = 269). Heme b did not correlate with chl a in the IB or SS. In the IB and SS, stations with high-chlorophyll and low-nutrient (Fe and/or Si) concentrations exhibited low heme b concentrations relative to particulate organic carbon (< 0.1 μmol mol-1), and high chl a:heme b ratios (> 500). High chl a:heme b ratios resulted from relative decreases in heme b, suggesting proteins such as cytochrome b6f, the core complex of photosystem II, and eukaryotic nitrate reductase were depleted relative to proteins containing chlorophyll such as the eukaryotic light-harvesting antenna. Relative variations in heme b, particulate organic carbon, and chl a can thus be indicative of a physiological response of the phytoplankton community to the prevailing growth conditions, within the context of large-scale changes in phytoplankton community composition. Key Points Heme b is fundamental to electron transport in marine microbes Heme b concentrations were determined in the Atlantic and Southern Oceans Heme b was depleted in iron depleted regions in the high latitudes © 2013 The Authors. Global Biogeochemical Cycles published by Wiley on behalf of the American Geophysical Union.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77545
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: School of Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton, United Kingdom; Chemical Oceanography, Helmholtz Centre for Ocean Research (GEOMAR), DE-24148 Kiel, Germany; Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University Virginia, Norfolk, United States; Royal Netherlands Institute for Sea Research, Den Burg, Netherlands
Recommended Citation:
Gledhill M,, Achterberg E,P,et al. Distributions of particulate Heme b in the Atlantic and Southern Oceans - Implications for electron transport in phytoplankton[J]. Global Biogeochemical Cycles,2013-01-01,27(4)