Document Detail

Impact of diazotrophy on N stable isotope signatures of nitrate and particulate organic nitrogen: case studies in the north-eastern tropical Atlantic Ocean.
MedLine Citation:
PMID:  20706897     Owner:  NLM     Status:  MEDLINE    
During two independent cruises in the north-eastern tropical Atlantic Ocean, we applied two different approaches to investigate the impact of diazotrophy on nitrogen stable isotope signatures in nitrate and particulate organic nitrogen (PON) of the food-web constituents. The first approach, used during the Poseidon cruise 348 in the Mauritanian upwelling, investigated the long-term influence of diazotrophy on the natural abundance of δ(15)N-NO(-)(3) and PON. The second approach, adopted during the Cape Verde field cruise, applied stable isotope tracer addition experiments. These served to determine the instantaneous transfer of diazotrophic N to the higher trophic level. Both approaches showed that N(2) fixation was compatible with the pattern and the magnitude of the isotopic depletion of dissolved NO(-)(3) during the Mauritanian upwelling cruise, as well as PON in zooplankton and phytoplankton during the Cape Verde cruises. An N-budget using (15)N incorporation rates and diazotrophic N(2) fixation rates showed that 6 % of the daily N(2) fixation was potentially taken up by the mesozooplankton community. Direct grazing accounted for 56 % of gross mesozooplanktonic N incorporation, while 46 % occurred due to channelling through the microbial loop.
Nicola Wannicke; Iris Liskow; Maren Voss
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Isotopes in environmental and health studies     Volume:  46     ISSN:  1477-2639     ISO Abbreviation:  Isotopes Environ Health Stud     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-09-16     Completed Date:  2011-01-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9602611     Medline TA:  Isotopes Environ Health Stud     Country:  England    
Other Details:
Languages:  eng     Pagination:  337-54     Citation Subset:  IM    
Department of Biological Oceanography, Leibniz Institute for Baltic Sea Research, Seestrasse 15, Rostock, Germany.
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MeSH Terms
Atlantic Ocean
Cape Verde
Copepoda / growth & development,  metabolism
Cyanobacteria / growth & development,  metabolism
Food Chain
Nitrates / metabolism*
Nitrogen / metabolism*
Nitrogen Fixation / physiology*
Nitrogen Isotopes / metabolism*
Organic Chemicals / metabolism*
Phytoplankton / growth & development,  metabolism
Zooplankton / growth & development,  metabolism
Reg. No./Substance:
0/Nitrates; 0/Nitrogen Isotopes; 0/Organic Chemicals; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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