title: Organic matter content and particle size modifications in mangrove sediments as responses to sea level rise.
abstract: Mangroves sediments contain large reservoirs of organic material (OM) as mangrove ecosystems produce large quantities and rapidly burial OM. Sediment accumulation rates of approximately 2.0 mm year(-1), based on (210)Pb(ex) dating, were estimated at the margin of two well-developed mangrove forest in southern Brazil. Regional data point to a relative sea level (RSL) rise of up to ∼4.0 mm year(-1). This RSL rise in turn, may directly influence the origin and quantity of organic matter (OM) deposited along mangrove sediments. Lithostratigraphic changes show that sand deposition is replacing the mud (<63 μm) fraction and OM content is decreasing in successively younger sediments. Sediment accumulation in coastal areas that are not keeping pace with sea level rise is potentially conducive to the observed shifts in particle size and OM content.
authors.affiliation: Universidade Federal de Fluminense (UFF), Departamento de Geoquímica, Niterói-RJ, Brazil. zinosanders@yahoo.com
authors.forename: Christian J
authors.initials: CJ
authors.lastname: Sanders
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Smoak
authors.forename: Mathew N
authors.initials: MN
authors.lastname: Waters
authors.forename: Luciana M
authors.initials: LM
authors.lastname: Sanders
authors.forename: Nilva
authors.initials: N
authors.lastname: Brandini
authors.forename: Sambasiva R
authors.initials: SR
authors.lastname: Patchineelam
mesh_terms: D001938:Brazil; D004784:Environmental Monitoring / Q000379:methods / Q000706:statistics & numerical data*; D019015:Geologic Sediments / Q000032:analysis*; D006812:Humic Substances / Q000032:analysis*; D007856:Lead Radioisotopes / Q000032:analysis; D010316:Particle Size; D043982:Rhizophoraceae; D013054:Spectrophotometry, Atomic; D014197:Trees; D014872:Water Movements
chemical_list: D006812:Humic Substances; D007856:Lead Radioisotopes