Journal ArticleDOI
Assessment of a δ15N Isotopic Method to Indicate Anthropogenic Eutrophication in Aquatic Ecosystems
Marci L. Cole,Ivan Valiela,Kevin D. Kroeger,Gabrielle Tomasky,Just Cebrian,Cathleen Wigand,Richard A. McKinney,Sara P. Grady,Maria Helena Carvalho da Silva +8 more
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TLDR
The relationship derived between S. alterniflora and relative wastewater load to predict wastewater loads in locations lacking quantitative land use data matched well with known qualitative information, proving the use of a stable isotopic method for predicting wastewater input.Abstract:
Increased anthropogenic delivery of nutrients to water bodies, both freshwater and estuarine, has caused detrimental changes in habitat, food web structure, and nutrient cycling. Nitrogen-stable isotopes may be suitable indicators of such increased nutrient delivery. In this study, we looked at the differences in response of macrophyte delta15N values to anthropogenic N across different taxonomic groups and geographic regions to test a stable isotopic method for detecting anthropogenic impacts. Macrophyte delta15N values increased with wastewater input and water-column dissolved inorganic nitrogen (DIN) concentration. When macrophytes were divided into macroalgae and plants, they responded similarly to increases in wastewater N, although macroalgae was a more reliable indicator of both wastewater inputs and water-column DIN concentrations. Smooth cordgrass (Spartina alterniflora Loisel.) Delta15N increased uniformly with wastewater inputs across a geographic range. We used the relationship derived between S. alterniflora and relative wastewater load to predict wastewater loads in locations lacking quantitative land use data. The predictions matched well with known qualitative information, proving the use of a stable isotopic method for predicting wastewater input.read more
Citations
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Book ChapterDOI
Stable Isotope Tracing of Temporal and Spatial Variability in Organic Matter Sources to Freshwater Ecosystems
Jacques C. Finlay,Carol Kendall +1 more
Journal ArticleDOI
Using δ15N values in algal tissue to map locations and potential sources of anthropogenic nutrient inputs on the island of Maui, Hawai‘i, USA
TL;DR: Algal delta(15)N signatures were used to map anthropogenic nitrogen through coastal surveys (island-wide and fine-scale) and algal deployments along nearshore and offshore gradients and suggest that cesspool and agricultural nitrogen reached the respective adjacent coastlines.
Journal ArticleDOI
Historical records of coastal eutrophication-induced hypoxia
Andrew J. Gooday,Frans Jorissen,Lisa A. Levin,Jack J. Middelburg,S. W. A. Naqvi,Nancy N. Rabalais,M. I. Scranton,Jian Zhang +7 more
TL;DR: A variety of biological and geochemical indicators (proxies) derived from sediment cores have been used to reconstruct the development of eutrophication and hypoxic conditions over time as mentioned in this paper.
Journal ArticleDOI
Biomagnification of Trace Elements in the Aquatic Food Web in the Mekong Delta, South Vietnam Using Stable Carbon and Nitrogen Isotope Analysis
Tokutaka Ikemoto,Nguyen Phuc Cam Tu,Noboru Okuda,Noboru Okuda,Akihisa Iwata,Koji Omori,Shinsuke Tanabe,Bui Cach Tuyen,Ichiro Takeuchi +8 more
TL;DR: The present study revealed that the biomagnification profiles of trace metals differ between crustacean and fishes; concentrations of Mn, Cu, Zn, As, Sr, Mo, Ag, Cd, Sb, Cs, Ba, Tl, and Pb were significantly higher in crustaceans, whereas fishes showed higher concentrations of Cr, Rb, and Hg (trophic level determined by δ15N).
Journal ArticleDOI
Towards an urban marine ecology: characterizing the drivers, patterns and processes of marine ecosystems in coastal cities
Peter A. Todd,Eliza C. Heery,Lynette H.L. Loke,Ruth H. Thurstan,D. Johan Kotze,Christopher M. Swan +5 more
TL;DR: In this article, Byrnes et al. presented an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
References
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Journal ArticleDOI
Stable isotopes in ecosystem studies
Bruce J. Peterson,Brian Fry +1 more
TL;DR: The use of stable isotopes to solve biogeochemical problems in ecosystem analysis is increasing rapidly because stable isotope data can contribute both source-sink (tracer) and process information: the elements C, N, S, H, and all have more than one isotope, and isotopic compositions of natural materials can be measured with great precision with a mass spectrometer as mentioned in this paper.
Book ChapterDOI
δ13C Measurements as Indicators of Carbon Flow in Marine and Freshwater Ecosystems
B. Fry,E. B. Sherr +1 more
TL;DR: Stable isotope ratios provide clues about the origins and transformations of organic matter and have been used as a tool for understanding complex ecological processes as mentioned in this paper, which has prompted increasing use of stable isotope analyses as a method to understand complex biological processes.
Journal ArticleDOI
A simple and precise method for measuring ammonium in marine and freshwater ecosystems
TL;DR: A fluorometric method is presented that gives precise measurements of ammonium over a wide range of concentrations and salinities emphasizing submicromolar levels and not only solves analytical problems but also substantially simplifies sample collection and preservation.
Book ChapterDOI
Tracing nitrogen sources and cycling in catchments
TL;DR: In this article, the authors focus on the uses of isotopes to understand water chemistry and discuss the use of isotopic techniques to assess impacts of changes in land management practices and land use on water quality.
Book
Marine ecological processes
TL;DR: In this paper, the authors studied the role of primary producers in marine ecosystems and their role in the formation of organic matter in photosynthesis and secondary production of marine organisms, as well as the effect of other factors on primary production.