Document Detail

Differences in urbanization and degree of marine influence are reflected in delta13C and delta15N of producers and consumers in seagrass habitats of Puerto Rico.
MedLine Citation:
PMID:  19931902     Owner:  NLM     Status:  MEDLINE    
Couplings between land use and marine food webs in tropical systems are poorly understood. We compared land-sea coupling in seven sites around Puerto Rico, differing in the degree of precipitation and urbanization, by measuring delta(13)C and delta(15)N in producers and consumers. delta(15)N values were influenced by human activity: the food web from sites near urbanized centers was on average 1 per thousand heavier in delta(15)N compared to undeveloped sites. This is most likely due to wastewater inputs from septic systems relatively near the shoreline. Changes in delta(13)C were best explained by differences in the degree of marine influence. Where terrestrial inputs from a major river dominated, delta(13)C values were lighter, whereas sites further from land and in locations exposed to oceanic currents had heavier delta(13)C values, characteristic of a marine source of dissolved organic carbon. We found no significant effect of precipitation on connectivity in spite of a twofold difference in annual average rainfall between the north and south coast. The results suggest there is some connectivity between land and sea in Puerto Rico, despite high rates of evaporation relative to precipitation.
Ylva S Olsen; Sophia E Fox; Erin L Kinney; Mirta Teichberg; Ivan Valiela
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-10-14
Journal Detail:
Title:  Marine environmental research     Volume:  69     ISSN:  1879-0291     ISO Abbreviation:  Mar. Environ. Res.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-02-15     Completed Date:  2010-05-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882895     Medline TA:  Mar Environ Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  198-206     Citation Subset:  IM    
Copyright Information:
Copyright 2009 Elsevier Ltd. All rights reserved.
The Ecosystems Center, Marine Biological Laboratory, 7 MBL St., Woods Hole, MA 02543, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Carbon Isotopes / analysis
Food Chain*
Hydrocharitaceae / chemistry
Nitrogen Isotopes / analysis
Puerto Rico
Seawater / analysis*
Sewage / chemistry
Soil / analysis*
Reg. No./Substance:
0/Carbon Isotopes; 0/Nitrogen Isotopes; 0/Sewage; 0/Soil

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

Previous Document:  Crown pull-off test (crown retention test) to evaluate the bonding effectiveness of luting agents.
Next Document:  Hierarchically microporous/macroporous scaffold of magnesium-calcium phosphate for bone tissue regen...