DOI: 10.1002/2016GB005575
Scopus记录号: 2-s2.0-85040733294
论文题名: Limited Carbonate Dissolution by Boring Microflora at Two Volcanically Acidified Temperate Sites: Ischia (Italy, Mediterranean Sea) and Faial (Azores, NE Atlantic Ocean)
作者: Tribollet A ; , Grange J ; S ; , Parra H ; , Rodolfo-Metalpa R ; , Carreiro-Silva M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2018
卷: 32, 期: 1 起始页码: 78
结束页码: 91
语种: 英语
英文关键词: aragonite and calcite substrates
; biogenic dissolution
; boring microalgae
; CO2 vents
; temperate ecosystems
Scopus关键词: aragonite
; biogenic emission
; carbon dioxide
; dissolution
; microalga
; ocean acidification
; pH
; seawater
; temperate environment
; Atlantic Ocean
; Atlantic Ocean (Northeast)
; Azores
; Campania [Italy]
; Faial
; Ischia
; Italy
; Mediterranean Sea
; Napoli [Campania]
; Portugal
英文摘要: In situ effects of ocean acidification on carbonate dissolution by microboring flora, also called biogenic dissolution, have only been studied once in tropical environments. Naturally acidified seawaters due to CO2 vents offer a perfect setting to study these effects in temperate systems. Three sites were selected at Ischia (Italy, Mediterranean Sea) with one experiencing ambient pH and the two others a mean pHT of 7.2 and 7.5. At Faial (Azores, NE Atlantic), one site with ambient pH and one acidified site with a mean pHT of 7.4 were selected. Experiments were carried out during 1.5 months and 6 months in Azores and Ischia, respectively, to determine the effects of OA on microboring communities in various carbonate substrates. Low pH influenced negatively boring microflora development by limiting their depth of penetration and abundance in substrates. Biogenic dissolution was thus reduced by a factor 3 to 7 depending on sites and substrate types. At sites with ambient pH in Faial, biogenic dissolution contributed up to 23% to the total weight loss, while it contributed less than 1% to the total weight loss of substrates at the acidified sites. Most of the dissolution at these sites was due to chemical dissolution (often Ω ≤ 1). Such conditions maintained microboring communities at a pioneer stage with a limited depth of penetration in substrates. Our results, together with previous findings that showed an increase of biogenic dissolution at pH > 7.7, suggest that there is a pH tipping point below which microborer development and thus carbonate biogenic dissolution is strongly limited. ©2017. 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/77686
Appears in Collections: 气候变化事实与影响
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作者单位: IRD-Sorbonne Universités (UPMC Univ, Paris 06)-CNRS-MNHN, Laboratoire LOCEAN, Paris Cedex, France; IMAR-Institute of Marine Research, MARE—Marine and Environmental Sciences Centre, Horta, Portugal; UMR ENTROPIE, Centre IRD de Nouméa, Nouméa, New Caledonia
Recommended Citation:
Tribollet A,, Grange J,S,et al. Limited Carbonate Dissolution by Boring Microflora at Two Volcanically Acidified Temperate Sites: Ischia (Italy, Mediterranean Sea) and Faial (Azores, NE Atlantic Ocean)[J]. Global Biogeochemical Cycles,2018-01-01,32(1)