Estuaries and Coasts

, Volume 37, Issue 2, pp 399–410 | Cite as

Using Optical Properties to Quantify Fringe Mangrove Inputs to the Dissolved Organic Matter (DOM) Pool in a Subtropical Estuary

  • Kaelin M. Cawley
  • Youhei Yamashita
  • Nagamitsu Maie
  • Rudolf Jaffé
Article

Abstract

Dissolved organic carbon (DOC) concentration and dissolved organic matter (DOM) optical properties were analyzed along two estuarine river transects during the wet and dry seasons to better understand DOM dynamics and quantify mangrove inputs. A tidal study was performed to assess the impacts of tidal pumping on DOM transport. DOM in the estuaries showed non-conservative mixing indicative of mangrove-derived inputs. Similarly, fluorescence data suggest that some terrestrial humic-like components showed non-conservative behavior. An Everglades freshwater-derived fluorescent component, which is associated with soil inputs from the Northern Everglades, behaved conservatively. During the dry season, a protein-like component behaved conservatively until the mid-salinity range when non-conservative behavior due to degradation and/or loss was observed. The tidal study data suggests mangrove porewater inputs to the rivers following low tide. The differences in quantity of DOM exported by the Shark and Harney Rivers imply that geomorphology and tidal hydrology may be a dominant factor controlling the amount of DOM exported from the mangrove ecotone, where up to 21 % of the DOC is mangrove-derived. Additionally, nutrient concentrations and other temporal factors may control DOM export from the mangroves, particularly for the microbially derived fluorescent components, contributing to the seasonal differences. The wet and dry season fluxes of mangrove DOM from the Shark River is estimated as 0.27 × 109 mg C d−1 and 0.075 × 109 mg C d−1, respectively, and the Harney River is estimated as 1.9 × 109 mg C d−1 and 0.20 × 109 mg C d−1.

Keywords

Mangroves EEM-PARAFAC Everglades Estuaries Dissolved Organic Matter (DOM) Fluorescence Carbon Flux 

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Copyright information

© Coastal and Estuarine Research Federation 2013

Authors and Affiliations

  • Kaelin M. Cawley
    • 1
    • 4
  • Youhei Yamashita
    • 2
  • Nagamitsu Maie
    • 3
  • Rudolf Jaffé
    • 1
  1. 1.Southeast Environmental Research Center and Department of Chemistry and BiochemistryFlorida International UniversityMiamiUSA
  2. 2.Faculty of Environmental Earth ScienceHokkaido UniversitySapporoJapan
  3. 3.Department of Environmental Biosciences, School of Veterinary MedicineKitasato UniversityTowadaJapan
  4. 4.Department of Civil, Environmental, and Architectural EngineeringUniversity of Colorado at BoulderBoulderUSA

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