Document Detail

delta15N of seagrass leaves for monitoring anthropogenic nutrient increases in coral reef ecosystems.
MedLine Citation:
PMID:  12705918     Owner:  NLM     Status:  MEDLINE    
In a coral reef environment, a slight increase in dissolved inorganic nitrogen (DIN;> or =1.0 micro M) can alter the ecosystem via macroalgal blooms. We collected seagrass leaves from the tropical and subtropical Pacific Ocean in five countries and examined the interactions between nutrient concentrations (C, N, P), molar ratios of nutrients, and delta15N to find a possible indicator of the DIN conditions. Within most sites, the concentrations of nutrients and their molar ratios showed large variations owing to species-specific values. On the other hand, almost identical delta15N values were found in seagrass leaves of several species at each site. The correlations between delta15N and nutrient concentrations and between delta15N and molar ratios of nutrients suggested that nutrient availability did not affect the delta15N value of seagrass leaves by altering the physiological condition of the plants. Increases in delta15N of seagrass leaves mostly matched increases in DIN concentrations in the bottom water. We suggest that delta15N in seagrass leaves can be a good tool to monitor time-integrated decrease/increase of DIN concentrations at a site, both in the water column and the interstitial water.
M Yamamuro; H Kayanne; H Yamano
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Marine pollution bulletin     Volume:  46     ISSN:  0025-326X     ISO Abbreviation:  Mar. Pollut. Bull.     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-04-22     Completed Date:  2003-09-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0260231     Medline TA:  Mar Pollut Bull     Country:  England    
Other Details:
Languages:  eng     Pagination:  452-8     Citation Subset:  IM    
Institute for Marine Resources and Environment, AIST Tsukuba Central 7, 1-1-1 Higashi, Tsukuba, 305-8567, Japan.
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MeSH Terms
Environmental Monitoring / methods*
Nitrogen Isotopes / analysis
Plant Leaves / chemistry
Poaceae / chemistry*
Reg. No./Substance:
0/Nitrogen Isotopes

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