Document Detail

Assessment of mangrove response to projected relative sea-level rise and recent historical reconstruction of shoreline position.
MedLine Citation:
PMID:  17171293     Owner:  NLM     Status:  MEDLINE    
We predict the decadal change in position of three American Samoa mangroves from analysis of a time series of remotely sensed imagery, a geographic information system, tide gauge data, and projections for change in sea-level relative to the mangrove surface. Accurate predictions of changes to coastal ecosystem boundaries, including in response to projected relative sea-level rise, enable advanced planning to minimize and offset anticipated losses and minimize social disruption and cost of reducing threats to coastal development and human safety. The observed mean landward migration of three mangroves' seaward margins over four decades was 25, 64, and 72 mma(-1), 12 to 37 times the observed relative sea-level rise rate. Two of the sites had clear trends in reductions in mangrove area, where there was a highly significant correlation between the change in position of the seaward mangrove margin and change in relative sea-level. Here it can be inferred that the force of sea-level rise relative to the mangrove surface is causing landward migration. Shoreline movement was variable at a third site and not significantly correlated with changing sea-level, where it is likely that forces other than change in relative sea-level are predominant. Currently, 16.5%, 23.4%, and 68.0% of the three mangroves' landward margins are obstructed by coastal development from natural landward migration. The three mangroves could experience as high as a 50.0% reduction in area by the year 2100. A 12% reduction in mangrove area by the year 2100 is possible in the Pacific islands region.
Eric Gilman; Joanna Ellison; Richard Coleman
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Publication Detail:
Type:  Historical Article; Journal Article     Date:  2006-12-14
Journal Detail:
Title:  Environmental monitoring and assessment     Volume:  124     ISSN:  0167-6369     ISO Abbreviation:  Environ Monit Assess     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-03-05     Completed Date:  2007-04-24     Revised Date:  2009-05-11    
Medline Journal Info:
Nlm Unique ID:  8508350     Medline TA:  Environ Monit Assess     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  105-30     Citation Subset:  IM    
School of Geography and Environmental Studies, University of Tasmania, Private bag 78, Hobart, Tasmania, 7001, Australia.
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MeSH Terms
American Samoa
Geographic Information Systems
History, 20th Century
History, 21st Century
Oceanography / history,  trends
Rhizophoraceae / growth & development*
Risk Assessment

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