DOI: 10.1111/gcb.14392
Scopus记录号: 2-s2.0-85052636163
论文题名: Dependency of Antarctic zooplankton species on ice algae-produced carbon suggests a sea ice-driven pelagic ecosystem during winter
作者: Kohlbach D. ; Graeve M. ; Lange B.A. ; David C. ; Schaafsma F.L. ; van Franeker J.A. ; Vortkamp M. ; Brandt A. ; Flores H.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 10 起始页码: 4667
结束页码: 4681
语种: 英语
英文关键词: Antarctic food web
; carbon sources
; climate change
; Compound-specific Stable Isotope Analysis
; marker fatty acids
; sea ice algae
; under-ice community
Scopus关键词: algae
; Calanus propinquus
; Copepoda
; Eusirus
; Salpa thompsoni
英文摘要: How the abundant pelagic life of the Southern Ocean survives winter darkness, when the sea is covered by pack ice and phytoplankton production is nearly zero, is poorly understood. Ice-associated (“sympagic”) microalgae could serve as a high-quality carbon source during winter, but their significance in the food web is so far unquantified. To better understand the importance of ice algae-produced carbon for the overwintering of Antarctic organisms, we investigated fatty acid (FA) and stable isotope compositions of 10 zooplankton species, and their potential sympagic and pelagic carbon sources. FA-specific carbon stable isotope compositions were used in stable isotope mixing models to quantify the contribution of ice algae-produced carbon (αIce) to the body carbon of each species. Mean αIce estimates ranged from 4% to 67%, with large variations between species and depending on the FA used for the modelling. Integrating the αIce estimates from all models, the sympagic amphipod Eusirus laticarpus was the most dependent on ice algal carbon (αIce: 54%–67%), and the salp Salpa thompsoni showed the least dependency on ice algal carbon (αIce: 8%–40%). Differences in αIceestimates between FAs associated with short-term vs. long-term lipid pools suggested an increasing importance of ice algal carbon for many species as the winter season progressed. In the abundant winter-active copepod Calanus propinquus, mean αIce reached more than 50% in late winter. The trophic carbon flux from ice algae into this copepod was between 3 and 5 mg C m−2 day−1. This indicates that copepods and other ice-dependent zooplankton species transfer significant amounts of carbon from ice algae into the pelagic system, where it fuels the food web, the biological carbon pump and elemental cycling. Understanding the role of ice algae-produced carbon in these processes will be the key to predictions of the impact of future sea ice decline on Antarctic ecosystem functioning. © 2018 The Authors. Global Change Biology Published by John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110219
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung, Bremerhaven, Germany; Centre for Natural History (CeNak), Zoological Museum, University of Hamburg, Hamburg, Germany; Fisheries and Oceans Canada, Freshwater Institute, Winnipeg, MB, Canada; Wageningen Marine Research, Den Helder, Netherlands; Senckenberg Naturmuseum, Frankfurt am Main, Germany
Recommended Citation:
Kohlbach D.,Graeve M.,Lange B.A.,et al. Dependency of Antarctic zooplankton species on ice algae-produced carbon suggests a sea ice-driven pelagic ecosystem during winter[J]. Global Change Biology,2018-01-01,24(10)