Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation
Dissolved organic matter (DOM) was analyzed by its optical and fluorescent properties in order to study its distribution, source and transformation in relation to microbial abundances, chlorophyll and physicochemical gradients along a transect in the eastern Beagle Channel (BC) during austral spring...
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ftconicet:oai:ri.conicet.gov.ar:11336/233314 2024-05-12T07:56:36+00:00 Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation Malits, Andrea Monforte, Chiara Iachetti, Clara Margarita Gerea, Marina Latorre, Maite Pilmayquen application/pdf http://hdl.handle.net/11336/233314 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2023.103863 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0924796323000076 http://hdl.handle.net/11336/233314 Malits, Andrea; Monforte, Chiara; Iachetti, Clara Margarita; Gerea, Marina; Latorre, Maite Pilmayquen; Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation; Elsevier Science; Journal of Marine Systems; 240; 103863; 5-2023; 1-13 0924-7963 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ CDOM DISSOLVED ORGANIC MATTER FDOM MICROBES MICROBIAL CARBON PUMP VIRUSES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.jmarsys.2023.103863 2024-04-18T23:41:34Z Dissolved organic matter (DOM) was analyzed by its optical and fluorescent properties in order to study its distribution, source and transformation in relation to microbial abundances, chlorophyll and physicochemical gradients along a transect in the eastern Beagle Channel (BC) during austral spring 2019. Moreover, DOM evolution was followed during three tidal cycles in two fixed stations (F1, F2) separated by the Mackinlay Strait, a hydrographic frontier between water masses under stronger continental influence (inner sector) and that of less modified Sub-Antarctic waters (outer sector). The fluorescence signals of protein- and humic-like compounds were used as a proxy for labile and non-labile material, respectively, while the concentration of nano-, pico- and virioplankton populations, chlorophyll-a (Chl-a) and dissolved organic carbon (DOC) were used as a proxy for biological activity. Moreover, several spectroscopic indices, such as the indicator of microbially produced DOM (BIX), the Freshness index (FIX), an indicator of molecular weight, the Slope Ratio (SR) and an indicator of chromophoric DOM (CDOM), were used to trace the quality and origin of DOM. Chl-a concentration was generally low in the sampling area (< 1 μg L− 1 ) but increased towards the end of the campaign and especially during the visit of F1 along with the concentration of picoeukaryotes and the protein-like fluorophores evidencing the onset of a bloom event. Protein-like fluorophores peaked in the euphotic zone of the inner sector of the BC while humic-like material of terrestrial origin was homogeneously distributed throughout the water column and showed a decreasing gradient towards the outer sector and Atlantic waters. Furthermore, the inner sector was characterized by higher amounts of CDOM, high molecular weight material and more recalcitrant DOM. Accumulation of autochthonous humic-like material in bottom waters of the inner sector along with enhanced values of FIX and BIX preceded by colored organic material suggest an efficient ... Article in Journal/Newspaper Antarc* Antarctic CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Austral Journal of Marine Systems 240 103863 |
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Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
CDOM DISSOLVED ORGANIC MATTER FDOM MICROBES MICROBIAL CARBON PUMP VIRUSES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
CDOM DISSOLVED ORGANIC MATTER FDOM MICROBES MICROBIAL CARBON PUMP VIRUSES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Malits, Andrea Monforte, Chiara Iachetti, Clara Margarita Gerea, Marina Latorre, Maite Pilmayquen Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation |
topic_facet |
CDOM DISSOLVED ORGANIC MATTER FDOM MICROBES MICROBIAL CARBON PUMP VIRUSES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
Dissolved organic matter (DOM) was analyzed by its optical and fluorescent properties in order to study its distribution, source and transformation in relation to microbial abundances, chlorophyll and physicochemical gradients along a transect in the eastern Beagle Channel (BC) during austral spring 2019. Moreover, DOM evolution was followed during three tidal cycles in two fixed stations (F1, F2) separated by the Mackinlay Strait, a hydrographic frontier between water masses under stronger continental influence (inner sector) and that of less modified Sub-Antarctic waters (outer sector). The fluorescence signals of protein- and humic-like compounds were used as a proxy for labile and non-labile material, respectively, while the concentration of nano-, pico- and virioplankton populations, chlorophyll-a (Chl-a) and dissolved organic carbon (DOC) were used as a proxy for biological activity. Moreover, several spectroscopic indices, such as the indicator of microbially produced DOM (BIX), the Freshness index (FIX), an indicator of molecular weight, the Slope Ratio (SR) and an indicator of chromophoric DOM (CDOM), were used to trace the quality and origin of DOM. Chl-a concentration was generally low in the sampling area (< 1 μg L− 1 ) but increased towards the end of the campaign and especially during the visit of F1 along with the concentration of picoeukaryotes and the protein-like fluorophores evidencing the onset of a bloom event. Protein-like fluorophores peaked in the euphotic zone of the inner sector of the BC while humic-like material of terrestrial origin was homogeneously distributed throughout the water column and showed a decreasing gradient towards the outer sector and Atlantic waters. Furthermore, the inner sector was characterized by higher amounts of CDOM, high molecular weight material and more recalcitrant DOM. Accumulation of autochthonous humic-like material in bottom waters of the inner sector along with enhanced values of FIX and BIX preceded by colored organic material suggest an efficient ... |
format |
Article in Journal/Newspaper |
author |
Malits, Andrea Monforte, Chiara Iachetti, Clara Margarita Gerea, Marina Latorre, Maite Pilmayquen |
author_facet |
Malits, Andrea Monforte, Chiara Iachetti, Clara Margarita Gerea, Marina Latorre, Maite Pilmayquen |
author_sort |
Malits, Andrea |
title |
Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation |
title_short |
Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation |
title_full |
Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation |
title_fullStr |
Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation |
title_full_unstemmed |
Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation |
title_sort |
source characterization of dissolved organic matter in the eastern beagle channel from a spring situation |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/233314 |
geographic |
Antarctic Austral |
geographic_facet |
Antarctic Austral |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2023.103863 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0924796323000076 http://hdl.handle.net/11336/233314 Malits, Andrea; Monforte, Chiara; Iachetti, Clara Margarita; Gerea, Marina; Latorre, Maite Pilmayquen; Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation; Elsevier Science; Journal of Marine Systems; 240; 103863; 5-2023; 1-13 0924-7963 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.jmarsys.2023.103863 |
container_title |
Journal of Marine Systems |
container_volume |
240 |
container_start_page |
103863 |
_version_ |
1798836761028198400 |