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Exudation and decomposition of chromophoric dissolved organic matter (CDOM) from some temperate macroalgae

The quantity of chromophoric or coloured dissolved organic matter (CDOM) released by eleven species of intertidal and sub-tidal macroalgae commonly found on UK shores was investigated. The subsequent breakdown of CDOM was also measured by exposing collected CDOM samples to light and dark conditions...

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Published in:Estuarine, coastal and shelf science coastal and shelf science, 2009-08, Vol.84 (1), p.147-153
Main Authors: Hulatt, Christopher J., Thomas, David N., Bowers, David G., Norman, Louiza, Zhang, Chi
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Language:English
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cited_by cdi_FETCH-LOGICAL-c491t-3ffd4e39c6bf827ca6e177b13465175963f10117fd3955be574f8d8d9f960243
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container_title Estuarine, coastal and shelf science
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creator Hulatt, Christopher J.
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description The quantity of chromophoric or coloured dissolved organic matter (CDOM) released by eleven species of intertidal and sub-tidal macroalgae commonly found on UK shores was investigated. The subsequent breakdown of CDOM was also measured by exposing collected CDOM samples to light and dark conditions for over two weeks. CDOM absorption properties were compared at a fixed wavelength of 440 nm and across two integrated wave - bands; UV-A (400–315 nm) and UV-B (315–280 nm). Absorption spectra of macroalgal CDOM samples were typically characterized by peaks and shoulders in the UV bands, features which were species specific. The spectral slope, derived using the log-linear method, proved to be very specific to the species and to the effect of light. Slope measurements ranged from 0.010 to 0.027 nm −1, in the range of normal seawater values. Significantly more CDOM was produced by algae which were illuminated, providing evidence for a light driven exudation mechanism. Averaged across all species, exudation in the dark accounted for 63.7% of that in the light in the UV-B band. Interspecific differences in exudation rate encompassed an order of magnitude, with the highest absorption measurements attributable to brown algae. However, some brown algae produced considerably less CDOM (e.g. Pelvetia canaliculata), which were more comparable to the green and red species. Over an exposure time of 16 days, significant photochemical degradation of CDOM was observed using a natural summer sunlight regime, showing that natural solar radiation could be an important removal mechanism for newly produced algal CDOM. Though the most obvious effect was a decrease in absorption, photo-bleaching also caused a significant increase in the spectral slope parameter of 0.004 nm −1.
doi_str_mv 10.1016/j.ecss.2009.06.014
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identifier ISSN: 0272-7714
ispartof Estuarine, coastal and shelf science, 2009-08, Vol.84 (1), p.147-153
issn 0272-7714
1096-0015
language eng
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source Elsevier
subjects Algae
Animal and plant ecology
Animal, plant and microbial ecology
Bands
Biological and medical sciences
Brackish
Brackish water ecosystems
CDOM
chromophoric dissolved organic matter
Coastal
Dissolved organic matter
DOM
Exudation
Fundamental and applied biological sciences. Psychology
macroalgae
Pelvetia canaliculata
photochemical
Sea water
Spectra
Sunlight
Synecology
title Exudation and decomposition of chromophoric dissolved organic matter (CDOM) from some temperate macroalgae
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