Document Detail


Atmospheric concentrations of ammonia and nitrogen dioxide at a tropical coral cay with high seabird density.
MedLine Citation:
PMID:  20145887     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Ecosystems with high seabird densities can receive extremely high inputs of nitrogen (N) from bird guano. Seabirds deposit up to 1000 kg N ha(-1) y(-1) on Heron Island, a tropical coral cay of the Great Barrier Reef. We quantified atmospheric concentrations of ammonia (NH(3)) and nitrogen dioxide (NO(2)) with passive air samplers at beach, woodland and forest along a gradient of low, intermediate and high bird densities, respectively. NO(2) concentrations at all studied sites were generally low (average 0.2-2.3 microg NO(2) m(-3)) and similar to other ecosystems. An exception was the main traffic zone of helicopter and barge traffic which had elevated concentrations (average 6.2, maximum 25 microg NO(2) m(-3)) comparable to traffic-intense urban areas elsewhere. Increasing average NH(3) concentrations from 0.7 to 17 microg NH(3) m(-3) was associated with greater seabird nesting density. In areas of intermediate and high bird density, NH(3) concentrations were substantially higher than those typically detected in natural and agricultural systems, supporting the notion that seabird guano is a major source of NH(3). The steep decline of NH(3) concentrations in areas with low bird density indicates that trans-island transport of NH(3) is low. NH(3) may not only be re-deposited in close vicinity of the source but is also transported vertically as concentrations above the tree canopy averaged 7.5 microg NH(3) m(-3). How much guano-derived NH(3) contributes to reefal waters via the possible transfer path water --> land --> water remains to be established. We discuss atmospheric concentrations of NH(3) and NO(2) in context of N-based gaseous pollutants and effects on vegetation.
Authors:
Susanne Schmidt; Katrina Mackintosh; Rob Gillett; Alex Pudmenzky; Diane E Allen; Heinz Rennenberg; Jochen F Mueller
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-11-12
Journal Detail:
Title:  Journal of environmental monitoring : JEM     Volume:  12     ISSN:  1464-0333     ISO Abbreviation:  J Environ Monit     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-02-10     Completed Date:  2010-05-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100968688     Medline TA:  J Environ Monit     Country:  England    
Other Details:
Languages:  eng     Pagination:  460-5     Citation Subset:  IM    
Affiliation:
School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia. Susanne.Schmidt@uq.edu.au
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MeSH Terms
Descriptor/Qualifier:
Ammonia / analysis*
Animals
Anthozoa*
Birds
Ecosystem*
Environmental Monitoring / methods*
Nitrogen Dioxide / analysis*
Queensland
Seasons
Tropical Climate
Water Pollutants, Chemical / chemistry*
Chemical
Reg. No./Substance:
0/Water Pollutants, Chemical; 10102-44-0/Nitrogen Dioxide; 7664-41-7/Ammonia

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


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