<abstract xmlns="http://www.w3.org/1999/xhtml">

Due to the limited water exchange, lagoons are particularly prone to eutrophication. The consumption of oxygen in this process, coupled with simultaneous enrichment of bottom sediments with organic matter, reinforces the occurrence of anaerobic conditions and methanogenic growth. Methanogenic archaea activities cause depolymerization of organic compounds accumulated in sediments. As a result of such ecosystem transformation, methane might be produced and emitted from this basin. Chemical studies conducted in 2010 were focused on methane content in the surface bottom sediments in the Polish part of the Vistula Lagoon. The results showed that the highest methane concentration occurs in the southwestern part of this basin (6.45 mmol dm-3), while the lowest one in the southeastern part (7.1 × 10-3 mmol dm-3). Molecular studies were focused on specific methanogenic archaea gene identification. The comparison of nucleotide sequences of “mcrA gene” clones obtained from genomic DNA isolated from the Vistula Lagoon sediments indicates a similarity to the yet uncultivated archaea, but also to archaea from the <italic>Methanosarcinales</italic> and <italic>Methanomicrobiales</italic> orders.
</abstract>

Due to the limited water exchange, lagoons are particularly prone to eutrophication. The consumption of oxygen in this process, coupled with simultaneous enrichment of bottom sediments with organic matter, reinforces the occurrence of anaerobic conditions and methanogenic growth. Methanogenic archaea activities cause depolymerization of organic compounds accumulated in sediments. As a result of such ecosystem transformation, methane might be produced and emitted from this basin. Chemical studies conducted in 2010 were focused on methane content in the surface bottom sediments in the Polish part of the Vistula Lagoon. The results showed that the highest methane concentration occurs in the southwestern part of this basin (6.45 mmol dm-3), while the lowest one in the southeastern part (7.1 × 10-3 mmol dm-3). Molecular studies were focused on specific methanogenic archaea gene identification. The comparison of nucleotide sequences of “mcrA gene” clones obtained from genomic DNA isolated from the Vistula Lagoon sediments indicates a similarity to the yet uncultivated archaea, but also to archaea from the Methanosarcinales and Methanomicrobiales orders.

Biological factor controlling methane production in surface sediment in the Polish part of the Vistula Lagoon

Department of Marine Chemistry and Environmental Protection, Institute of Oceanography

Oceanological and Hydrobiological Studies

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Due to the limited water exchange, lagoons are particularly prone to eutrophication. The consumption of oxygen in this process, coupled with simultaneous...

Site No	C_tot	C_org	BC	CH₄
Site No	%			μmol dm^-3
1	3.08	2.49	0.43	12.4	± 2.4
2	2.69	1.85	0.42	23.6	± 1.9
3	2.00	1.32	0.33	9.3	± 2.9
4	2.18	1.38	0.37	7.1	± 2.2
5	2.53	1.99	0.28	25.8	± 2.0
6	0.17	0.13	0.01	14.8	± 2.5
7	2.78	1.81	0.38	6450	± 0.2
8	1.60	1.05	0.32	5140	±0.2
9	3.75	2.75	0.56	36.7	±2.2

Location of sampling sites			water depth	temperature	transparency	oxygen	salinity
Location of sampling sites			m	°C	m	mg dm^-3	PSU
1	54°45’12.5’’	19°66’87.5’’	2.9	6.8	0.5	11.9	3.4
2	54°44’71.4’’	19°72’46.4’’	4.8	7.2	0.6	12.0	3.6
3	54°44’48.9’’	19°76’05.8’’	3.4	7.3	0.7	11.2	3.6
4	54°36’61.1’’	19°66’64.2’’	2.5	6.7	0.7	11.8	3.1
5	54°39’37.5’’	19°63’99.7’’	4.0	7.5	0.6	11.6	3.3
6	54°36’62.2’’	19°45’00.3’’	2.5	7.5	0.6	12.4	2.7
7	54°30’05.6’’	19°29’65.3’’	2.5	6.9	1.4	12.2	1.1
8	54°28’91.7’’	19°42’70.3’’	2.4	6.7	0.8	14.7	1.2
9	54°33’17.8’’	19°52’02.8’’	2.5	7.25	0.6	11.8	2.8

Biological factor controlling methane production in surface sediment in the Polish part of the Vistula Lagoon

Article Category: Original research paper

Pubblicato online: 31 mag 2017

Pagine: 223 - 230

Ricevuto: 20 lug 2016

Accettato: 22 nov 2016

DOI: https://doi.org/10.1515/ohs-2017-0022

© Faculty of Oceanography and Geography, University of Gdańsk, Poland. All rights reserved.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Figure 2

Figure 3

Results of chemical analysis of sediment samples from the Vistula Lagoon: total carbon (Ctot), organic carbon (Corg), black carbon (BC), and methane content ± standard deviation

Location of sediment sampling sites in the Polish part of the Vistula Lagoon and near-bottom water parameters during sediment sampling