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...
Published in: | Journal of Marine Systems |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2023
|
Subjects: | |
Online Access: | https://lup.lub.lu.se/record/1e876737-1c15-4abb-94f0-b384977862a0 https://doi.org/10.1016/j.jmarsys.2023.103863 |
id |
ftulundlup:oai:lup.lub.lu.se:1e876737-1c15-4abb-94f0-b384977862a0 |
---|---|
record_format |
openpolar |
spelling |
ftulundlup:oai:lup.lub.lu.se:1e876737-1c15-4abb-94f0-b384977862a0 2023-06-11T04:06:32+02:00 Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation Malits, Andrea Monforte, Chiara Iachetti, Clara Gerea, Marina Latorre, Maité 2023-05 https://lup.lub.lu.se/record/1e876737-1c15-4abb-94f0-b384977862a0 https://doi.org/10.1016/j.jmarsys.2023.103863 eng eng Elsevier https://lup.lub.lu.se/record/1e876737-1c15-4abb-94f0-b384977862a0 http://dx.doi.org/10.1016/j.jmarsys.2023.103863 scopus:85150336330 Journal of Marine Systems; 240, no 103863 (2023) ISSN: 0924-7963 Ecology CDOM Dissolved organic matter FDOM Microbes Microbial carbon pump Viruses contributiontojournal/article info:eu-repo/semantics/article text 2023 ftulundlup https://doi.org/10.1016/j.jmarsys.2023.103863 2023-04-26T22:27:34Z 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 Lund University Publications (LUP) Antarctic Austral Journal of Marine Systems 240 103863 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Ecology CDOM Dissolved organic matter FDOM Microbes Microbial carbon pump Viruses |
spellingShingle |
Ecology CDOM Dissolved organic matter FDOM Microbes Microbial carbon pump Viruses Malits, Andrea Monforte, Chiara Iachetti, Clara Gerea, Marina Latorre, Maité Source characterization of dissolved organic matter in the eastern Beagle Channel from a spring situation |
topic_facet |
Ecology CDOM Dissolved organic matter FDOM Microbes Microbial carbon pump Viruses |
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 Gerea, Marina Latorre, Maité |
author_facet |
Malits, Andrea Monforte, Chiara Iachetti, Clara Gerea, Marina Latorre, Maité |
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 |
publishDate |
2023 |
url |
https://lup.lub.lu.se/record/1e876737-1c15-4abb-94f0-b384977862a0 https://doi.org/10.1016/j.jmarsys.2023.103863 |
geographic |
Antarctic Austral |
geographic_facet |
Antarctic Austral |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Journal of Marine Systems; 240, no 103863 (2023) ISSN: 0924-7963 |
op_relation |
https://lup.lub.lu.se/record/1e876737-1c15-4abb-94f0-b384977862a0 http://dx.doi.org/10.1016/j.jmarsys.2023.103863 scopus:85150336330 |
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_ |
1768378536295399424 |