Organic Contaminant Mixture Significantly Changes Microbenthic Community Structure and Increases the Expression of PAH Degradation Genes

Iburg, Sven; Nybom, Inna; Bonaglia, Stefano; Karlson, Agnes M. L.; Sobek, Anna; Nascimento, Francisco J. A.

doi:10.3389/fenvs.2020.00128

Cited by 9 publications

(4 citation statements)

References 100 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental research on sediment from the Baltic Sea showed that in sediments exposed to cadmium (Cd) at environmentally relevant concentrations and varying oxygen conditions including hypoxia, Cd affected microbial denitrification (Broman et al, 2019). In contrast, no effects on nitrification rates or the bacterial ammonia oxidizer gene were found in Baltic Sea sediment contaminated by PAHs and PCBs, while significant effects on the microbenthic community structure were observed (Iburg et al, 2020).…”

Section: Effects On Biogeochemical Processes In Sedimentmentioning

confidence: 75%

Biogeochemical functioning of the Baltic Sea

et al. 2022

Self Cite

View full text Add to dashboard Cite

Abstract. Location, specific topography, and hydrographic setting together with climate change and strong anthropogenic pressure are the main factors shaping the biogeochemical functioning and thus also the ecological status of the Baltic Sea. The recent decades have brought significant changes in the Baltic Sea. First, the rising nutrient loads from land in the second half of the 20th century led to eutrophication and spreading of hypoxic and anoxic areas, for which permanent stratification of the water column and limited ventilation of deep-water layers made favourable conditions. Since the 1980s the nutrient loads to the Baltic Sea have been continuously decreasing. This, however, has so far not resulted in significant improvements in oxygen availability in the deep regions, which has revealed a slow response time of the system to the reduction of the land-derived nutrient loads. Responsible for that is the low burial efficiency of phosphorus at anoxic conditions and its remobilization from sediments when conditions change from oxic to anoxic. This results in a stoichiometric excess of phosphorus available for organic-matter production, which promotes the growth of N2-fixing cyanobacteria and in turn supports eutrophication. This assessment reviews the available and published knowledge on the biogeochemical functioning of the Baltic Sea. In its content, the paper covers the aspects related to changes in carbon, nitrogen, and phosphorus (C, N, and P) external loads, their transformations in the coastal zone, changes in organic-matter production (eutrophication) and remineralization (oxygen availability), and the role of sediments in burial and turnover of C, N, and P. In addition to that, this paper focuses also on changes in the marine CO2 system, the structure and functioning of the microbial community, and the role of contaminants for biogeochemical processes. This comprehensive assessment allowed also for identifying knowledge gaps and future research needs in the field of marine biogeochemistry in the Baltic Sea.

show abstract

Section: Effects On Biogeochemical Processes In Sedimentmentioning

confidence: 75%

Biogeochemical functioning of the Baltic Sea

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, it is possible that these differences are related to a potential higher input of organic content associated with boating (e.g., fuel leakage, anti-fouling compounds, etc. ), and/or the use by bacteria of micropollutants as carbon sources ( 73 – 76 ). However, such potential effects of contaminant release related to boating activities on microbial communities should be investigated in more-controlled conditions in future studies.…”

Section: Discussionmentioning

confidence: 99%

Effects of Recreational Boating on Microbial and Meiofauna Diversity in Coastal Shallow Ecosystems of the Baltic Sea

Iburg

Shen

Austin

et al. 2021

mSphere

Self Cite

View full text Add to dashboard Cite

show abstract

“…Pseudomonadaceae have been detected at hydrocarbon contaminated sites ( Aitken et al, 1998 ; Romero et al, 1998 ) and cultured representatives can degrade a range of PAHs ( Mueller et al, 1990 ; Rockne et al, 2000 ). In a study of Baltic Sea sediment, an elevated expression of PAH-ring hydroxylating dioxygenase genes was attributed to Pseudomonas members, which were particularly responsive to added pyrene and phenanthrene ( Iburg et al, 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Natural and anthropogenic carbon input affect microbial activity in salt marsh sediment

Frates,

Spietz,

Silverstein

et al. 2023

Front. Microbiol.

View full text Add to dashboard Cite

Salt marshes are dynamic, highly productive ecosystems positioned at the interface between terrestrial and marine systems. They are exposed to large quantities of both natural and anthropogenic carbon input, and their diverse sediment-hosted microbial communities play key roles in carbon cycling and remineralization. To better understand the effects of natural and anthropogenic carbon on sediment microbial ecology, several sediment cores were collected from Little Sippewissett Salt Marsh (LSSM) on Cape Cod, MA, USA and incubated with either Spartina alterniflora cordgrass or diesel fuel. Resulting shifts in microbial diversity and activity were assessed via bioorthogonal non-canonical amino acid tagging (BONCAT) combined with fluorescence-activated cell sorting (FACS) and 16S rRNA gene amplicon sequencing. Both Spartina and diesel amendments resulted in initial decreases of microbial diversity as well as clear, community-wide shifts in metabolic activity. Multi-stage degradative frameworks shaped by fermentation were inferred based on anabolically active lineages. In particular, the metabolically versatile Marinifilaceae were prominent under both treatments, as were the sulfate-reducing Desulfovibrionaceae, which may be attributable to their ability to utilize diverse forms of carbon under nutrient limited conditions. By identifying lineages most directly involved in the early stages of carbon processing, we offer potential targets for indicator species to assess ecosystem health and highlight key players for selective promotion of bioremediation or carbon sequestration pathways.

show abstract

Organic Contaminant Mixture Significantly Changes Microbenthic Community Structure and Increases the Expression of PAH Degradation Genes

Cited by 9 publications

References 100 publications

Biogeochemical functioning of the Baltic Sea

Biogeochemical functioning of the Baltic Sea

Effects of Recreational Boating on Microbial and Meiofauna Diversity in Coastal Shallow Ecosystems of the Baltic Sea

Natural and anthropogenic carbon input affect microbial activity in salt marsh sediment

Contact Info

Product

Resources

About