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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1111/jpy.12250
|2 doi
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|a eng
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|a Ochoa-Izaguirre, María Julia
|e verfasserin
|4 aut
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|a Variability in nitrogen stable isotope ratios of macroalgae
|b consequences for the identification of nitrogen sources
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|c 2015
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a Date Completed 26.07.2016
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|a Date Revised 18.03.2016
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2014 Phycological Society of America.
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|a In our research, we collected and analyzed numerous macroalgal specimens (738) for isotopic analysis sampled over a year at monthly intervals across 20 sites within the Urías lagoon complex, a typical subtropical coastal ecosystem located in the Gulf of California. We quantified and characterized (chemically and isotopically) the N loads received by Urías throughout a year. We studied the spatial-temporal variation of the chemical forms and isotopic signals of the available N in the water column, and we monitored in situ different environmental variables and other hydrodynamic parameters. Multiple N sources (e.g., atmospheric, sewage, seafood processing, agriculture and aquaculture effluents) and biogeochemical reactions related to the N cycle (e.g., ammonia volatilization, nitrification and denitrification) co-occurring across the ecosystem, result in a mixture of chemical species and isotopic compositions of available N in the water column. Increased variability was observed in the δ(15) N values of macroalgae (0.41‰-22.67‰). Based on our results, the variation in δ(15) N was best explained by spatio-temporal changes in available N and not necessarily related to the N sources. The variability was also explained by the differences in macroalgal biology among functional groups, species and/or individuals. Although the δ(15) N-macroalgae technique was a useful tool to identify N sources, its application in coastal ecosystems receiving multiple N sources, with changing environmental conditions influencing biogeochemical processes, and high diversity of ephemeral macroalgal species, could be less sensitive and have less predictive power
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Eutrophication
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|a biogeochemical processes
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|a isotopic fractionation
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|a macroalgal metabolism
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|a δ15N-Macroalgal
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|a Soto-Jiménez, Martín F
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of phycology
|d 1966
|g 51(2015), 1 vom: 12. Feb., Seite 46-65
|w (DE-627)NLM098182994
|x 1529-8817
|7 nnns
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| 773 |
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|g volume:51
|g year:2015
|g number:1
|g day:12
|g month:02
|g pages:46-65
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|u http://dx.doi.org/10.1111/jpy.12250
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