DOI: 10.1002/2013GB004754
Scopus记录号: 2-s2.0-84900667636
论文题名: Deep-sea coral record of human impact on watershed quality in the Mississippi River Basin
作者: Prouty N ; G ; , Roark E ; B ; , Koenig A ; E ; , Demopoulos A ; W ; J ; , Batista F ; C ; , Kocar B ; D ; , Selby D ; , McCarthy M ; D ; , Mienis F
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 1 起始页码: 29
结束页码: 43
语种: 英语
英文关键词: deep-sea coral
; Gulf of Mexico
; land-use change
; nitrogen isotopes
; nutrients
; trace metal
Scopus关键词: Deep-sea corals
; Gulf of Mexico
; Land-use change
; Nitrogen isotopes
; Trace metal
; Amino acids
; Eutrophication
; Forestry
; Isotopes
; Land use
; Nitrogen
; Nutrients
; Rivers
; Sediment transport
; Water quality
; Watersheds
; River pollution
; agroindustry
; anthropogenic effect
; coral
; deep sea
; enrichment
; eutrophication
; hydrological change
; hypoxia
; land use change
; landscape change
; nature-society relations
; rhenium
; runoff
; trace metal
; tracer
; water quality
; watershed
; Atlantic Ocean
; Gulf of Mexico
; Mississippi Basin
; United States
; Anthozoa
英文摘要: One of the greatest drivers of historical nutrient and sediment transport into the Gulf of Mexico is the unprecedented scale and intensity of land use change in the Mississippi River Basin. These landscape changes are linked to enhanced fluxes of carbon and nitrogen pollution from the Mississippi River, and persistent eutrophication and hypoxia in the northern Gulf of Mexico. Increased terrestrial runoff is one hypothesis for recent enrichment in bulk nitrogen isotope (δ15N) values, a tracer for nutrient source, observed in a Gulf of Mexico deep-sea coral record. However, unambiguously linking anthropogenic land use change to whole scale shifts in downstream Gulf of Mexico biogeochemical cycles is difficult. Here we present a novel approach, coupling a new tracer of agro-industrialization to a multiproxy record of nutrient loading in long-lived deep-sea corals collected in the Gulf of Mexico. We found that coral bulk δ15N values are enriched over the last 150-200 years relative to the last millennia, and compound-specific amino acid δ15N data indicate a strong increase in baseline δ15N of nitrate as the primary cause. Coral rhenium (Re) values are also strongly elevated during this period, suggesting that 34% of Re is of anthropogenic origin, consistent with Re enrichment in major world rivers. However, there are no pre-anthropogenic measurements of Re to confirm this observation. For the first time, an unprecedented record of natural and anthropogenic Re variability is documented through coral Re records. Taken together, these novel proxies link upstream changes in water quality to impacts on the deep-sea coral ecosystem. Key Points Multi-proxy record of nutrient loading in long-lived deep-sea corals Bulk and compound-specific isotopes capture changes in watershed quality Novel approach to coupled tracer of agro-industrialization and land-use changee ©2014. 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/77493
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: US Geological Survey, Santa Cruz, CA, United States; Department of Geography, Texas AandM University, College Station, TX, United States; US Geological Survey, Denver, CO, United States; US Geological Survey, Gainesville, FL, United States; University of California, Santa Cruz Ocean Sciences Department, Santa Cruz, CA, United States; Stanford Synchrotron Radiation Lightsource, Menlo Park, CA, United States; Department of Earth Science, Durham University, Durham, United Kingdom; Royal Netherlands Institute for Sea Research, Texel, Netherlands
Recommended Citation:
Prouty N,G,, Roark E,et al. Deep-sea coral record of human impact on watershed quality in the Mississippi River Basin[J]. Global Biogeochemical Cycles,2014-01-01,28(1)