Bioavailability and remineralization rates of sediment-derived dissolved organic carbon from a Baltic Sea depositional area
This pilot study investigated the bioavailability and remineralization kinetics of the sediment-derived dissolved organic carbon (DOC) from the Gdańsk Deep, a depositional area in the Baltic Sea. This was assessed in the long-lasting (126 d) incubation experiment, in which the mixture of DOC from se...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-04-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2024.1359563/full |
| _version_ | 1797217512439414784 |
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| author | Monika Lengier Katarzyna Koziorowska-Makuch Beata Szymczycha Karol Kuliński |
| author_facet | Monika Lengier Katarzyna Koziorowska-Makuch Beata Szymczycha Karol Kuliński |
| author_sort | Monika Lengier |
| collection | DOAJ |
| description | This pilot study investigated the bioavailability and remineralization kinetics of the sediment-derived dissolved organic carbon (DOC) from the Gdańsk Deep, a depositional area in the Baltic Sea. This was assessed in the long-lasting (126 d) incubation experiment, in which the mixture of DOC from sediment pore water and bottom water was exposed to oxic microbial respiration with incubation of bottom water as a control run. The obtained decay curves allowed us to distinguish three DOC fractions: labile (DOCL), semi-labile (DOCSL), and refractory (DOCR). In bottom water, the refractory fraction was predominant and amounted to almost 85% of total DOC, whereas about 15% of DOC was bioavailable: 6% labile and 9% semi-labile. In contrast, DOC from pore water was much more bioavailable DOC (~55% of total DOC) and contained 11% DOCL and 44% DOCSL. The remineralization rate constants recalculated to the in situ temperature of 6°C for labile and semi-labile DOC in pore water were 0.025 d−1 and 0.002 d−1, respectively, whereas, in bottom water, 0.026 d−1 and 0.004 d−1. The half-life times for DOCL were comparable for both bottom water and pore water and amounted to 26.2 d and 27.6 d, respectively. For DOCSL, the half-life time was shorter for bottom water (165.5 d) than for pore water (322.9 d). |
| first_indexed | 2024-04-24T12:03:02Z |
| format | Article |
| id | doaj.art-7b9bfa8b439c4228878a6110a02d2d05 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-24T12:03:02Z |
| publishDate | 2024-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-7b9bfa8b439c4228878a6110a02d2d052024-04-08T12:48:52ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452024-04-011110.3389/fmars.2024.13595631359563Bioavailability and remineralization rates of sediment-derived dissolved organic carbon from a Baltic Sea depositional areaMonika LengierKatarzyna Koziorowska-MakuchBeata SzymczychaKarol KulińskiThis pilot study investigated the bioavailability and remineralization kinetics of the sediment-derived dissolved organic carbon (DOC) from the Gdańsk Deep, a depositional area in the Baltic Sea. This was assessed in the long-lasting (126 d) incubation experiment, in which the mixture of DOC from sediment pore water and bottom water was exposed to oxic microbial respiration with incubation of bottom water as a control run. The obtained decay curves allowed us to distinguish three DOC fractions: labile (DOCL), semi-labile (DOCSL), and refractory (DOCR). In bottom water, the refractory fraction was predominant and amounted to almost 85% of total DOC, whereas about 15% of DOC was bioavailable: 6% labile and 9% semi-labile. In contrast, DOC from pore water was much more bioavailable DOC (~55% of total DOC) and contained 11% DOCL and 44% DOCSL. The remineralization rate constants recalculated to the in situ temperature of 6°C for labile and semi-labile DOC in pore water were 0.025 d−1 and 0.002 d−1, respectively, whereas, in bottom water, 0.026 d−1 and 0.004 d−1. The half-life times for DOCL were comparable for both bottom water and pore water and amounted to 26.2 d and 27.6 d, respectively. For DOCSL, the half-life time was shorter for bottom water (165.5 d) than for pore water (322.9 d).https://www.frontiersin.org/articles/10.3389/fmars.2024.1359563/fullDOCbioavailabilitypore waterremineralization rate constanthalf-lifeGdańsk Basin |
| spellingShingle | Monika Lengier Katarzyna Koziorowska-Makuch Beata Szymczycha Karol Kuliński Bioavailability and remineralization rates of sediment-derived dissolved organic carbon from a Baltic Sea depositional area Frontiers in Marine Science DOC bioavailability pore water remineralization rate constant half-life Gdańsk Basin |
| title | Bioavailability and remineralization rates of sediment-derived dissolved organic carbon from a Baltic Sea depositional area |
| title_full | Bioavailability and remineralization rates of sediment-derived dissolved organic carbon from a Baltic Sea depositional area |
| title_fullStr | Bioavailability and remineralization rates of sediment-derived dissolved organic carbon from a Baltic Sea depositional area |
| title_full_unstemmed | Bioavailability and remineralization rates of sediment-derived dissolved organic carbon from a Baltic Sea depositional area |
| title_short | Bioavailability and remineralization rates of sediment-derived dissolved organic carbon from a Baltic Sea depositional area |
| title_sort | bioavailability and remineralization rates of sediment derived dissolved organic carbon from a baltic sea depositional area |
| topic | DOC bioavailability pore water remineralization rate constant half-life Gdańsk Basin |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2024.1359563/full |
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