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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 |
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creator | Hulatt, Christopher J. Thomas, David N. Bowers, David G. Norman, Louiza Zhang, Chi |
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 |
format | article |
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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
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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.</description><subject>Algae</subject><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Bands</subject><subject>Biological and medical sciences</subject><subject>Brackish</subject><subject>Brackish water ecosystems</subject><subject>CDOM</subject><subject>chromophoric dissolved organic matter</subject><subject>Coastal</subject><subject>Dissolved organic matter</subject><subject>DOM</subject><subject>Exudation</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>macroalgae</subject><subject>Pelvetia canaliculata</subject><subject>photochemical</subject><subject>Sea water</subject><subject>Spectra</subject><subject>Sunlight</subject><subject>Synecology</subject><issn>0272-7714</issn><issn>1096-0015</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqFkUFv1DAUhC0EEkvhD3DyBVQOCX52Yq8lLmgpBamol94tr_3cepXEwc5W5d_jsBXH9mRp9M1Y84aQ98BaYCA_H1p0pbScMd0y2TLoXpANMC0bxqB_STaMK94oBd1r8qaUQ1WhF3xDDhcPR2-XmCZqJ089ujTOqcR_SgrU3eU0pvku5eioj6Wk4R49TfnWTlUZ7bJgpue7b9e_PtFQWVrSiHTBccZsF6yEy8kOtxbfklfBDgXfPb5n5Ob7xc3uR3N1fflz9_WqcZ2GpREh-A6FdnIftlw5KxGU2oPoZA-q11KEWhlU8EL3_R571YWt33odtGS8E2fk4yl2zun3EctixlgcDoOdMB2LEVKsRvUsyIEp0WlWwfMnQVCSA4AGqCg_obV0KRmDmXMcbf5jgJl1KXMw61JmXcowaepS1fThMd8WZ4eQ7eRi-e_koLa12hr-5cRhvd59xGyKizg59DGjW4xP8alv_gJj9ql5</recordid><startdate>20090820</startdate><enddate>20090820</enddate><creator>Hulatt, Christopher J.</creator><creator>Thomas, David N.</creator><creator>Bowers, David G.</creator><creator>Norman, Louiza</creator><creator>Zhang, Chi</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope><scope>7SN</scope><scope>7TN</scope><scope>C1K</scope><scope>F1W</scope><scope>H95</scope><scope>H96</scope><scope>L.G</scope><scope>M7N</scope></search><sort><creationdate>20090820</creationdate><title>Exudation and decomposition of chromophoric dissolved organic matter (CDOM) from some temperate macroalgae</title><author>Hulatt, Christopher J. ; Thomas, David N. ; Bowers, David G. ; Norman, Louiza ; Zhang, Chi</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c491t-3ffd4e39c6bf827ca6e177b13465175963f10117fd3955be574f8d8d9f960243</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Algae</topic><topic>Animal and plant ecology</topic><topic>Animal, plant and microbial ecology</topic><topic>Bands</topic><topic>Biological and medical sciences</topic><topic>Brackish</topic><topic>Brackish water ecosystems</topic><topic>CDOM</topic><topic>chromophoric dissolved organic matter</topic><topic>Coastal</topic><topic>Dissolved organic matter</topic><topic>DOM</topic><topic>Exudation</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>macroalgae</topic><topic>Pelvetia canaliculata</topic><topic>photochemical</topic><topic>Sea water</topic><topic>Spectra</topic><topic>Sunlight</topic><topic>Synecology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hulatt, Christopher J.</creatorcontrib><creatorcontrib>Thomas, David N.</creatorcontrib><creatorcontrib>Bowers, David G.</creatorcontrib><creatorcontrib>Norman, Louiza</creatorcontrib><creatorcontrib>Zhang, Chi</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Ecology Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><jtitle>Estuarine, coastal and shelf science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hulatt, Christopher J.</au><au>Thomas, David N.</au><au>Bowers, David G.</au><au>Norman, Louiza</au><au>Zhang, Chi</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Exudation and decomposition of chromophoric dissolved organic matter (CDOM) from some temperate macroalgae</atitle><jtitle>Estuarine, coastal and shelf science</jtitle><date>2009-08-20</date><risdate>2009</risdate><volume>84</volume><issue>1</issue><spage>147</spage><epage>153</epage><pages>147-153</pages><issn>0272-7714</issn><eissn>1096-0015</eissn><coden>ECSSD3</coden><abstract>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.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ecss.2009.06.014</doi><tpages>7</tpages></addata></record> |
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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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