Distinct optical chemistry of dissolved organic matter in urban pond ecosystems

PloS One
Nicola A McEnroePaul C Frost

Abstract

Urbanization has the potential to dramatically alter the biogeochemistry of receiving freshwater ecosystems. We examined the optical chemistry of dissolved organic matter (DOM) in forty-five urban ponds across southern Ontario, Canada to examine whether optical characteristics in these relatively new ecosystems are distinct from other freshwater systems. Dissolved organic carbon (DOC) concentrations ranged from 2 to 16 mg C L(-1) across the ponds with an average value of 5.3 mg C L(-1). Excitation-emission matrix (EEM) spectroscopy and parallel factor analysis (PARAFAC) modelling showed urban pond DOM to be characterized by microbial-like and, less importantly, by terrestrial derived humic-like components. The relatively transparent, non-humic DOM in urban ponds was more similar to that found in open water, lake ecosystems than to rivers or wetlands. After irradiation equivalent to 1.7 days of natural solar radiation, DOC concentrations, on average, decreased by 38% and UV absorbance decreased by 25%. Irradiation decreased the relative abundances of terrestrial humic-like components and increased protein-like aspects of the DOM pool. These findings suggest that high internal production and/or prolonged exposure to sunlight exer...Continue Reading

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Citations

Sep 24, 2015·Global Change Biology·Clayton J WilliamsMarguerite A Xenopoulos
Aug 15, 2019·Global Change Biology·Sonia Herrero OrtegaMark O Gessner

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Methods Mentioned

BETA
fluorescence spectroscopy
PCA

Software Mentioned

PASW Statistics
JMP
R
VEGAN
Matlab

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