Watershed Deforestation and Down-Estuary Transformations Alter Sources, Transport, and Export of Suspended Particles in Panamanian Mangrove Estuaries Journal Article


Authors: Valiela, I.; Bartholomew, M.; Giblin, A.; Tucker, J.; Harris, C.; Martinetto, P.; Otter, M.; Camilli, L.; Stone, T.
Article Title: Watershed Deforestation and Down-Estuary Transformations Alter Sources, Transport, and Export of Suspended Particles in Panamanian Mangrove Estuaries
Abstract: We identified eight Panamanian watersheds in which conversion from wet tropical forest to pastures differed and assessed the effects of degree of deforestation, and down-estuary transformations, on the suspended particulate matter discharged from the watersheds, entering, traversing through mangrove estuaries, and emerging into coastal waters. Deforested watersheds discharged larger concentrations of suspended particulate matter, with lower % C and N, higher mineral content, and heavier isotopic signatures into fresh reaches of estuaries. Down-estuary, sediment entrainment increased non-organic content of particulates, and watershed-derived imprints of deforestation on composition of particulate matter were mostly erased by within-estuary transformations. Isotopic signatures of C, N, and S in particulate matter demonstrated strong land-sea couplings, and indicated that the direction of the coupling was asymmetrical, with terrestrial and estuarine sources delivering particulate materials to coastal waters and sediments. Mangrove estuaries therefore both act as powerful modulators of human activities on land, while also exporting particulate materials to sea.
Keywords: CARBON; SURFACE SEDIMENTS; STABLE ISOTOPES; VEGETATION; NITROGEN; RIVER DISCHARGE; Sulfur; LAND-USE CHANGE; TROPICAL FORESTS; SOIL ORGANIC-MATTER; carbon isotopes; coastal sediment; CENTRAL AMAZON; TROPICAL WET FOREST; changes; SULFUR ISOTOPE; STABLE ISOTOPIC COMPOSITION; land-sea coupling; mangrove forests
Journal Title: Ecosystems
Volume: 17
Issue: 1
ISSN: 1432-9840
Publisher: Springer Verlag  
Publication Place: NEW YORK; 233 SPRING ST, NEW YORK, NY 10013 USA
Date Published: 2014
Start Page: 96
End Page: 111
DOI/URL:
Notes: PT: J; TC: 0; UT: WOS:000332002000008