DOI: 10.1111/gcb.13673
论文题名: Coralline algae elevate pH at the site of calcification under ocean acidification
作者: Cornwall C.E. ; Comeau S. ; McCulloch M.T.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 10 起始页码: 4245
结束页码: 4256
语种: 英语
英文关键词: boron isotopes
; calcification
; coralline algae
; ocean acidification
; pH upregulation
Scopus关键词: algae
; Amphiroa anceps
; Neogoniolithon
; Sporolithon durum
英文摘要: Coralline algae provide important ecosystem services but are susceptible to the impacts of ocean acidification. However, the mechanisms are uncertain, and the magnitude is species specific. Here, we assess whether species-specific responses to ocean acidification of coralline algae are related to differences in pH at the site of calcification within the calcifying fluid/medium (pHcf) using δ11B as a proxy. Declines in δ11B for all three species are consistent with shifts in δ11B expected if B(OH)4 − was incorporated during precipitation. In particular, the δ11B ratio in Amphiroa anceps was too low to allow for reasonable pHcf values if B(OH)3 rather than B(OH)4 − was directly incorporated from the calcifying fluid. This points towards δ11B being a reliable proxy for pHcf for coralline algal calcite and that if B(OH)3 is present in detectable proportions, it can be attributed to secondary postincorporation transformation of B(OH)4 −. We thus show that pHcf is elevated during calcification and that the extent is species specific. The net calcification of two species of coralline algae (Sporolithon durum, and Amphiroa anceps) declined under elevated CO2, as did their pHcf. Neogoniolithon sp. had the highest pHcf, and most constant calcification rates, with the decrease in pHcf being ¼ that of seawater pH in the treatments, demonstrating a control of coralline algae on carbonate chemistry at their site of calcification. The discovery that coralline algae upregulate pHcf under ocean acidification is physiologically important and should be included in future models involving calcification. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60808
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Earth Sciences and Oceans Institute, The University of Western Australia, Crawley, WA, Australia; ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, Crawley, WA, Australia
Recommended Citation:
Cornwall C.E.,Comeau S.,McCulloch M.T.. Coralline algae elevate pH at the site of calcification under ocean acidification[J]. Global Change Biology,2017-01-01,23(10)