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RESEARCH ARTICLE

Characterising the sources and fate of dissolved organic matter in Shark Bay, Australia: a preliminary study using optical properties and stable carbon isotopes

Kaelin M. Cawley A , Yan Ding A B , James Fourqurean A C and Rudolf Jaffé A B D
+ Author Affiliations
- Author Affiliations

A Southeast Environmental Research Center, Florida International University, Miami, FL 33199, USA.

B Department of Chemistry and Biochemistry, Marine Science Program, Florida International University, Miami, FL 33199, USA.

C Department of Biological Sciences, Marine Science Program, Florida International University, Miami, FL 33199, USA.

D Corresponding author. Email: jaffer@fiu.edu

Marine and Freshwater Research 63(11) 1098-1107 https://doi.org/10.1071/MF12028
Submitted: 31 January 2012  Accepted: 13 June 2012   Published: 26 November 2012

Abstract

Low latitude, seagrass-dominated coastal bays, such as Shark Bay, Australia, are potential sources of chromophoric dissolved organic matter (CDOM) to coastal regions. Dissolved organic matter (DOM) is known to influence aquatic nutrient dynamics, microbial community structure, and depth of light penetration in estuarine systems. Shark Bay is a sub-tropical ecosystem with limited freshwater inputs and restricted tidal flushing. As such, much of the DOM is expected to be seagrass-derived. However, combining excitation/emission fluorescence spectroscopy and parallel factor analysis (EEM-PARFAC) with 13C stable isotope analysis of DOM, we found evidence for DOM inputs from terrestrial (riverine and possibly groundwater), autochthonous plankton, macroalgae, and seagrass sources. Isotopic analysis of 13C in DOM supports the idea that seagrass inputs contribute substantially to the DOM pool in Shark Bay, whereas, EEM-PARAFAC data suggests that much of this input is derived from decomposing seagrass detritus and to a lesser extent due to exudation during primary production. We also report increases in DOM concentrations and changes in DOM characteristics with increasing salinity in surface water samples, indicating that evaporation is an important control on DOM concentration and photo-degradation may play a critical role in transforming DOM within the system.

Additional keywords : EEM-PARAFAC, fluorescence, seagrass, stable isotopes.


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