Photo-oxidation processes, properties of DOC, reactive oxygen species (ROS), and their potential impacts on native biota and carbon cycling in the Rio Negro (Amazonia, Brazil)
Given the reported degraded nature of DOC in the Rio Negro, and low oxygen, pH, and bacterial riverine levels, we hypothesized: (1) DOC would have strong humic and fulvic acid fluorescence signals with high aromaticity and large mean molecular weight; and (2) photo-oxidation rates would be slow, and...
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| Veröffentlicht in: | Hydrobiologia 2017-03, Vol.789 (1), p.7-29 |
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| creator | Johannsson, Ora E. Smith, D. Scott Sadauskas-Henrique, Helen Cimprich, Giselle Wood, Chris M. Val, Adalberto L. |
| description | Given the reported degraded nature of DOC in the Rio Negro, and low oxygen, pH, and bacterial riverine levels, we hypothesized: (1) DOC would have strong humic and fulvic acid fluorescence signals with high aromaticity and large mean molecular weight; and (2) photo-oxidation rates would be slow, and reactive oxygen species (ROS) concentrations low, producing no oxidative stress in biota. We surveyed the environment and properties of DOC and explored DOC photo-oxidation and fish sensitivity to DOC products. DOC properties were investigated using absorption and fluorescence indices and parallel factor analysis (PARAFAC) of excitation–emission matrices. ROS concentrations were measured spectrophotometrically. A native fish,
Hemigrammus levis
, was exposed to photo-oxidizing DOC and its tissues (brain, gill, liver) assayed for changes in antioxidant and biotransformation enzymes. With respect to our hypotheses, (1) DOC was highly terrigenous, with high SAC
340
values (aromaticity), high capacity to produce ROS, and high tryptophan-like fluorescence (bacterial, autochthonous signal); (2) photo-oxidation rates were appreciable, while products were related to mean UV-radiation levels (total radiation was constant). ROS levels were often higher than freshwater averages, yet fish experienced no oxidative stress. Results suggest photo-oxidation influences patterns in C-cycling, bacterial production and community dynamics between wet and dry seasons. |
| doi_str_mv | 10.1007/s10750-016-2687-9 |
| format | Article |
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Hemigrammus levis
, was exposed to photo-oxidizing DOC and its tissues (brain, gill, liver) assayed for changes in antioxidant and biotransformation enzymes. With respect to our hypotheses, (1) DOC was highly terrigenous, with high SAC
340
values (aromaticity), high capacity to produce ROS, and high tryptophan-like fluorescence (bacterial, autochthonous signal); (2) photo-oxidation rates were appreciable, while products were related to mean UV-radiation levels (total radiation was constant). ROS levels were often higher than freshwater averages, yet fish experienced no oxidative stress. Results suggest photo-oxidation influences patterns in C-cycling, bacterial production and community dynamics between wet and dry seasons.</description><identifier>ISSN: 0018-8158</identifier><identifier>EISSN: 1573-5117</identifier><identifier>DOI: 10.1007/s10750-016-2687-9</identifier><language>eng</language><publisher>Cham: Springer International Publishing</publisher><subject>Adapta ; Antioxidants ; Aquatic ecosystems ; Biomedical and Life Sciences ; Biota ; Biotransformation ; Carbon cycle ; Dry season ; Ecology ; Emission measurements ; Enzymes ; Factor analysis ; Fluorescence ; Freshwater & Marine Ecology ; Freshwater fish ; Fulvic acids ; Hemigrammus levis ; Life Sciences ; Oxidation ; Oxidative stress ; Oxygen ; Photooxidation ; Rainy season ; Ultraviolet radiation ; Zoology</subject><ispartof>Hydrobiologia, 2017-03, Vol.789 (1), p.7-29</ispartof><rights>Springer International Publishing Switzerland 2016</rights><rights>Hydrobiologia is a copyright of Springer, 2017.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c349t-24cad8232922bd72eb2d9eef73d7ba1d84ff2fd943e810e38e8cba941ff2c9553</citedby><cites>FETCH-LOGICAL-c349t-24cad8232922bd72eb2d9eef73d7ba1d84ff2fd943e810e38e8cba941ff2c9553</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10750-016-2687-9$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10750-016-2687-9$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Johannsson, Ora E.</creatorcontrib><creatorcontrib>Smith, D. Scott</creatorcontrib><creatorcontrib>Sadauskas-Henrique, Helen</creatorcontrib><creatorcontrib>Cimprich, Giselle</creatorcontrib><creatorcontrib>Wood, Chris M.</creatorcontrib><creatorcontrib>Val, Adalberto L.</creatorcontrib><title>Photo-oxidation processes, properties of DOC, reactive oxygen species (ROS), and their potential impacts on native biota and carbon cycling in the Rio Negro (Amazonia, Brazil)</title><title>Hydrobiologia</title><addtitle>Hydrobiologia</addtitle><description>Given the reported degraded nature of DOC in the Rio Negro, and low oxygen, pH, and bacterial riverine levels, we hypothesized: (1) DOC would have strong humic and fulvic acid fluorescence signals with high aromaticity and large mean molecular weight; and (2) photo-oxidation rates would be slow, and reactive oxygen species (ROS) concentrations low, producing no oxidative stress in biota. We surveyed the environment and properties of DOC and explored DOC photo-oxidation and fish sensitivity to DOC products. DOC properties were investigated using absorption and fluorescence indices and parallel factor analysis (PARAFAC) of excitation–emission matrices. ROS concentrations were measured spectrophotometrically. A native fish,
Hemigrammus levis
, was exposed to photo-oxidizing DOC and its tissues (brain, gill, liver) assayed for changes in antioxidant and biotransformation enzymes. With respect to our hypotheses, (1) DOC was highly terrigenous, with high SAC
340
values (aromaticity), high capacity to produce ROS, and high tryptophan-like fluorescence (bacterial, autochthonous signal); (2) photo-oxidation rates were appreciable, while products were related to mean UV-radiation levels (total radiation was constant). ROS levels were often higher than freshwater averages, yet fish experienced no oxidative stress. 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Scott ; Sadauskas-Henrique, Helen ; Cimprich, Giselle ; Wood, Chris M. ; Val, Adalberto L.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c349t-24cad8232922bd72eb2d9eef73d7ba1d84ff2fd943e810e38e8cba941ff2c9553</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Adapta</topic><topic>Antioxidants</topic><topic>Aquatic ecosystems</topic><topic>Biomedical and Life Sciences</topic><topic>Biota</topic><topic>Biotransformation</topic><topic>Carbon cycle</topic><topic>Dry season</topic><topic>Ecology</topic><topic>Emission measurements</topic><topic>Enzymes</topic><topic>Factor analysis</topic><topic>Fluorescence</topic><topic>Freshwater & Marine Ecology</topic><topic>Freshwater fish</topic><topic>Fulvic acids</topic><topic>Hemigrammus levis</topic><topic>Life Sciences</topic><topic>Oxidation</topic><topic>Oxidative stress</topic><topic>Oxygen</topic><topic>Photooxidation</topic><topic>Rainy season</topic><topic>Ultraviolet radiation</topic><topic>Zoology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Johannsson, Ora E.</creatorcontrib><creatorcontrib>Smith, D. Scott</creatorcontrib><creatorcontrib>Sadauskas-Henrique, Helen</creatorcontrib><creatorcontrib>Cimprich, Giselle</creatorcontrib><creatorcontrib>Wood, Chris M.</creatorcontrib><creatorcontrib>Val, Adalberto L.</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Animal Behavior Abstracts</collection><collection>Aqualine</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Toxicology Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Biology Database (Alumni Edition)</collection><collection>ProQuest Pharma Collection</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Agricultural & Environmental Science Collection</collection><collection>ProQuest Central Essentials</collection><collection>Biological Science Collection</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>ProQuest Central Student</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>ProQuest Biological Science Collection</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biological Science Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Environmental Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Environmental Science Collection</collection><collection>Genetics Abstracts</collection><jtitle>Hydrobiologia</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Johannsson, Ora E.</au><au>Smith, D. Scott</au><au>Sadauskas-Henrique, Helen</au><au>Cimprich, Giselle</au><au>Wood, Chris M.</au><au>Val, Adalberto L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Photo-oxidation processes, properties of DOC, reactive oxygen species (ROS), and their potential impacts on native biota and carbon cycling in the Rio Negro (Amazonia, Brazil)</atitle><jtitle>Hydrobiologia</jtitle><stitle>Hydrobiologia</stitle><date>2017-03-01</date><risdate>2017</risdate><volume>789</volume><issue>1</issue><spage>7</spage><epage>29</epage><pages>7-29</pages><issn>0018-8158</issn><eissn>1573-5117</eissn><abstract>Given the reported degraded nature of DOC in the Rio Negro, and low oxygen, pH, and bacterial riverine levels, we hypothesized: (1) DOC would have strong humic and fulvic acid fluorescence signals with high aromaticity and large mean molecular weight; and (2) photo-oxidation rates would be slow, and reactive oxygen species (ROS) concentrations low, producing no oxidative stress in biota. We surveyed the environment and properties of DOC and explored DOC photo-oxidation and fish sensitivity to DOC products. DOC properties were investigated using absorption and fluorescence indices and parallel factor analysis (PARAFAC) of excitation–emission matrices. ROS concentrations were measured spectrophotometrically. A native fish,
Hemigrammus levis
, was exposed to photo-oxidizing DOC and its tissues (brain, gill, liver) assayed for changes in antioxidant and biotransformation enzymes. With respect to our hypotheses, (1) DOC was highly terrigenous, with high SAC
340
values (aromaticity), high capacity to produce ROS, and high tryptophan-like fluorescence (bacterial, autochthonous signal); (2) photo-oxidation rates were appreciable, while products were related to mean UV-radiation levels (total radiation was constant). ROS levels were often higher than freshwater averages, yet fish experienced no oxidative stress. Results suggest photo-oxidation influences patterns in C-cycling, bacterial production and community dynamics between wet and dry seasons.</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><doi>10.1007/s10750-016-2687-9</doi><tpages>23</tpages></addata></record> |
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| subjects | Adapta Antioxidants Aquatic ecosystems Biomedical and Life Sciences Biota Biotransformation Carbon cycle Dry season Ecology Emission measurements Enzymes Factor analysis Fluorescence Freshwater & Marine Ecology Freshwater fish Fulvic acids Hemigrammus levis Life Sciences Oxidation Oxidative stress Oxygen Photooxidation Rainy season Ultraviolet radiation Zoology |
| title | Photo-oxidation processes, properties of DOC, reactive oxygen species (ROS), and their potential impacts on native biota and carbon cycling in the Rio Negro (Amazonia, Brazil) |
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