气候变化领域集成服务门户(CCPortal): Shallow water marine sediment bacterial community shifts along a natural CO2 gradient in the Mediterranean Sea Off vulcano, Italy

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.836216
	Shallow water marine sediment bacterial community shifts along a natural CO2 gradient in the Mediterranean Sea Off vulcano, Italy
	Kerfahi; Dorsaf; Hall-Spencer; Jason M; Tripathi; Binu M; Milazzo; Marco; Lee; Junghoon; Adams; Jonathan M
发布日期	2014-09-30
数据集类型	dataset
英文关键词	Benthos ; CO2 vent ; Coast and continental shelf ; Community composition and diversity ; Entire community ; Field observation ; Mediterranean Sea ; Soft-bottom community ; Temperate
英文简介	The effects of increasing atmospheric CO(2) on ocean ecosystems are a major environmental concern, as rapid shoaling of the carbonate saturation horizon is exposing vast areas of marine sediments to corrosive waters worldwide. Natural CO(2) gradients off Vulcano, Italy, have revealed profound ecosystem changes along rocky shore habitats as carbonate saturation levels decrease, but no investigations have yet been made of the sedimentary habitat. Here, we sampled the upper 2 cm of volcanic sand in three zones, ambient (median pCO(2) 419 µatm, minimum Omega (arag) 3.77), moderately CO(2)-enriched (median pCO(2) 592 µatm, minimum Omega (arag) 2.96), and highly CO(2)-enriched (median pCO(2) 1611 µatm, minimum Omega (arag) 0.35). We tested the hypothesis that increasing levels of seawater pCO(2) would cause significant shifts in sediment bacterial community composition, as shown recently in epilithic biofilms at the study site. In this study, 454 pyrosequencing of the V1 to V3 region of the 16S rRNA gene revealed a shift in community composition with increasing pCO(2). The relative abundances of most of the dominant genera were unaffected by the pCO(2) gradient, although there were significant differences for some 5 % of the genera present (viz. Georgenia, Lutibacter, Photobacterium, Acinetobacter, and Paenibacillus), and Shannon Diversity was greatest in sediments subject to long-term acidification (>100 years). Overall, this supports the view that globally increased ocean pCO(2) will be associated with changes in sediment bacterial community composition but that most of these organisms are resilient. However, further work is required to assess whether these results apply to other types of coastal sediments and whether the changes in relative abundance of bacterial taxa that we observed can significantly alter the biogeochemical functions of marine sediments.
空间范围	Median Latitude: 38.421247 * Median Longitude: 14.965253 * South-bound Latitude: 38.419310 * West-bound Longitude: 14.962170 * North-bound Latitude: 38.424300 * East-bound Longitude: 14.969400
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/217318
推荐引用方式 GB/T 7714	Kerfahi,Dorsaf,Hall-Spencer,et al. Shallow water marine sediment bacterial community shifts along a natural CO2 gradient in the Mediterranean Sea Off vulcano, Italy.2014-09-30.https://doi.org/10.1594/PANGAEA.836216.