气候变化领域集成服务门户(CCPortal): Spatial and seasonal variability of sedimentary features and nitrogen benthic metabolism in a tropical coastal area (Taganga Bay, Colombia Caribbean) impacted by a sewage outfall

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DOI	10.1007/s10533-020-00689-0
	Spatial and seasonal variability of sedimentary features and nitrogen benthic metabolism in a tropical coastal area (Taganga Bay, Colombia Caribbean) impacted by a sewage outfall
	Arroyave Gómez D.M.; Gallego Suárez D.; Bartoli M.; Toro-Botero M.
发表日期	2020
ISSN	0168-2563
起始页码	85
结束页码	107
卷号	150 期号:1
英文摘要	The effects of anthropogenic pressures in coastal areas are extensively studied in temperate but not in tropical zones, where their impact might be amplified by high water temperatures and upwelling phenomena. Sedimentary features and benthic metabolism were studied during the non upwelling (NUPW) and upwelling (UPW) seasons in Taganga Bay (Colombia). The bay is impacted by a submarine outfall of virtually untreated, organic and nutrient-rich wastewater. Samplings were performed in November 2017 (NUPW) and in January–February 2018 (UPW) at 4 stations located in the proximity and 100, 750 and 1800 m far from the outfall, respectively, at depths between 22 and 28 m. Aerobic respiration, denitrification, dissimilative nitrate reduction to ammonium (DNRA) and nutrient fluxes were measured. The influence of the outfall was detectable 750 and 1800 m away from the point pollution source, where δ13C data suggested that ~ 40 and ~ 20% of organic inputs were terrigenous, respectively. In the proximity of the outfall benthic oxygen demand peaked and the presence of Beggiatoa mats suggested reoxidation of sulphides, that were abundant in pore water. Under sulfidic conditions, DNRA was the major driver of nitrate demand, whereas at stations far from the outfall, denitrification dominated nitrate consumption. Organic matter and nitrate inputs to the bay during the UPW season enhanced the effects of the outfall by increasing aerobic respiration and DNRA. Higher N availability during the UPW season reversed fluxes of molecular nitrogen and turned the sediments of 3 out of 4 sites from net sinks to net N2 sources. Results from this study suggest that the analysis of sediments allows tracing the impact of the outfall and that such impact is enhanced during the upwelling season. In tropical areas, marine outfalls and upwelling may act in synergy and contribute to ecosystem deterioration due to high temperatures, increase of microbial respiration, sulphide toxicity and benthic biodiversity loss. © 2020, Springer Nature Switzerland AG.
英文关键词	Benthic respiration; Denitrification; Nitrate ammonification; Sediments; Sewage outfall; Stable isotopes; Upwelling
语种	英语
scopus关键词	anthropogenic effect; benthos; denitrification; metabolism; microbial mat; nitrogen; nitrogen cycle; seasonal variation; sedimentary feature; sewage outfall; spatial analysis; tropical environment; upwelling; Caribbean Coast [Colombia]; Colombia; Magdalena [Colombia]; Taganga Bay; Beggiatoa
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153113
作者单位	OCEANICOS Research Group, Facultad de Minas, Universidad Nacional de Colombia, Medellín, Colombia; Flujos reactivos y Procesos Research Group, Facultad de Minas, Universidad Nacional de Colombia, Medellín, Colombia; Department of Chemistry, Life Sciences and Environmental Sustainability, Parma University, Parma, Italy; Marine Research Institute, Klaipeda University, Klaipeda, Lithuania
推荐引用方式 GB/T 7714	Arroyave Gómez D.M.,Gallego Suárez D.,Bartoli M.,et al. Spatial and seasonal variability of sedimentary features and nitrogen benthic metabolism in a tropical coastal area (Taganga Bay, Colombia Caribbean) impacted by a sewage outfall[J],2020,150(1).
APA	Arroyave Gómez D.M.,Gallego Suárez D.,Bartoli M.,&Toro-Botero M..(2020).Spatial and seasonal variability of sedimentary features and nitrogen benthic metabolism in a tropical coastal area (Taganga Bay, Colombia Caribbean) impacted by a sewage outfall.Biogeochemistry,150(1).
MLA	Arroyave Gómez D.M.,et al."Spatial and seasonal variability of sedimentary features and nitrogen benthic metabolism in a tropical coastal area (Taganga Bay, Colombia Caribbean) impacted by a sewage outfall".Biogeochemistry 150.1(2020).