Low impact of Zostera marina meadows on sediment and water microbiota under brackish conditions

Environmental Microbiome, Год журнала: 2025, Номер 20(1)

Опубликована: Янв. 11, 2025

Abstract Background Zostera marina is an important ecosystem engineer influencing shallow water environments and possibly shaping the microbiota in surrounding sediments water. Z. typically found marine systems, but it can also proliferate under brackish conditions. Changes salinity generally have a strong impact on biota, especially at salty divide between 6 9. To better understand of interaction sediment microbiota, we investigated effects meadows across range 6–15 Baltic Sea during summer using 16S 18S rRNA gene amplicon sequencing. Results Salinity was most factor for structuring within both sediment. The presence affected composition bacterial eukaryotic community alpha diversity However, this effect confined to alpha-mesohaline conditions (salinity 9–15). below 9 insignificant. Conclusions Increasing associated with longer leaf length , causing increased canopy height, which affects through reduced velocity. Hence, propose that may be major predictor explaining ’s interactions 9–15. These findings emphasize importance physical meadow services implications management changing climate.

Язык: Английский

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Chitosan reduces naturally occurring plant pathogenic fungi and increases nematophagous fungus Purpureocillium in soil under field conditions

Frontiers in Agronomy, Год журнала: 2025, Номер 6

Опубликована: Янв. 22, 2025

Chitosan effects on soil properties were analysed both under laboratory conditions by incubation with constant humidity and temperature field in two persimmon plots conventional ecological management. was applied solution or as coacervates. Application of chitosan reduced pH, conductivity (CE), cation exchange capacity (CEC) pots when at capacity. did not affect respiration, which is greatly dependent moisture temperature. Metabarcoding showed that significantly modifies the fungal genera composition ecologically managed soil. On contrary, caused no significant differences bacterial taxa conditions. coacervates increased naturally occurring nematophagous fungus Purpureocillium ( ca. 50-fold) respect to solution-treated untreated controls. In addition, inoculum plant pathogenic fungi Alternaria Fusarium (20% 50%, respectively) Soil microbial network analysis for ITS2+V1–V2 regions revealed Pochonia promoted clustering into modules. Furthermore, ITS2+V3–V4 nematode trapping-fungus Orbilia bacteria belonging Acidimicrobiales Cytophagales contributed Our results show microbiota egg parasites trapping help structure microbiota.

Язык: Английский

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Epiphytic and endophytic microbiome of the seagrass Zostera marina: Do they contribute to pathogen reduction in seawater?

The Science of The Total Environment, Год журнала: 2023, Номер 908, С. 168422 - 168422

Опубликована: Ноя. 11, 2023

Seagrass ecosystems provide crucial ecosystem services for coastal environments and were shown to reduce the abundance of pathogens linked infections in humans marine organisms. Among potential drivers, seagrass phenolics released into seawater have been pathogen suppression, but involvement microbiome has not investigated. We hypothesized that eelgrass Zostera marina, especially leaf epiphytes are at direct interface between host surrounding seawater, inhibit waterborne thereby contributing their removal. Using a culture-dependent approach, we isolated 88 bacteria fungi associated with surfaces inner tissues leaves (healthy decaying) roots. assessed antibiotic activity microbial extracts against large panel common aquatic, human (fecal) plant pathogens, mined metabolome most active extracts. The healthy epibiotic bacteria, particularly Streptomyces sp. strain 131, displayed broad-spectrum superior some control drugs. Gram-negative abundant on surfaces, few endosphere-associated also remarkable activities. UPLC-MS/MS-based untargeted metabolomics analyses showed rich specialized metabolite repertoires low annotation rates, indicating presence many undescribed antimicrobials This study contributes our understanding chemical ecology seagrasses, implying suppression seawater. Such effect is beneficial health ocean human, context climate change expected exacerbate all infectious diseases. It may assist future conservation management strategies.

Язык: Английский

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Novel insights into the rhizosphere and seawater microbiome of Zostera marina in diverse mariculture zones

Microbiome, Год журнала: 2024, Номер 12(1)

Опубликована: Фев. 14, 2024

Abstract Background Seagrasses offer various ecosystem services and possess high levels of primary productivity. However, the development mariculture has affected homeostasis seagrass meadow ecosystems. Plant-microbiome associations are essential for seagrasses health, but little is known about role environmental microbiomes how they affect in a environment. In this study, we investigated influence on rhizosphere seawater microbiome surrounding Zostera marina focused bacterial, eukaryotic, fungal components composition, diversity, metabolism, responses to mariculture-related factors. Results Significant differences richness, internal relations bacterial community between sediment Z. were observed, while eukaryotic communities less significant. More complex co-occurrence networks found Saccharina japonica (SJ) sea cucumber (SC) culture zones. The SJ zone had higher dissimilatory assimilatory nitrate reduction, denitrification, nitrogen fixation processes than other three sulfate reduction enzymes sediments Tetracycline, sulfonamide, diaminopyrimidine resistance genes enriched SC Conclusions Our findings might contribute better understanding effects ecosystems thus revealing their potential operating mechanisms. These insights may serve raise awareness human activities natural ecosystems, regulation antibiotic usage, restoration.

Язык: Английский

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Above and below-ground bacterial communities shift in seagrass beds with warmer temperatures

Frontiers in Marine Science, Год журнала: 2024, Номер 11

Опубликована: Май 8, 2024

Current rates of ocean warming are predicted to exacerbate ongoing declines in seagrass populations. Above-ground responses increasing temperatures have been studied from a direct physiological perspective while indirect effects, including changes microbially-mediated below-ground processes, remain poorly understood. To test potential effects increased temperature on growth and associated microbial communities, we sampled beds experiencing ambient elevated water at Lake Macquarie, Australia. Sites with warmer were plume power station discharge channel analogous conditions by 2100 under current (+3°C). The community composition both sediments leaf tissues varied significantly between warm higher relative abundances putative sulphate-reducing bacteria such as Desulfocapsaceae, Desulfobulbaceae Desulfosarcinaceae sedimentary communities water. biomass greater sites detrital decomposition showed no difference suggesting buffering below-ground. These findings suggest 3°C rise temperate regions is unlikely induce mortality however, it may shift towards more homogenous structure composition.

Язык: Английский

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Macrophytes and their wrack as a habitat for faecal indicator bacteria and Vibrio in coastal marine environments

Marine Pollution Bulletin, Год журнала: 2023, Номер 194, С. 115325 - 115325

Опубликована: Июль 29, 2023

Язык: Английский

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An optimized electro-fenton pretreatment for the degradation and mineralization of a mixture of ofloxacin, norfloxacin, and ciprofloxacin

Chemosphere, Год журнала: 2023, Номер 344, С. 140339 - 140339

Опубликована: Окт. 9, 2023

Язык: Английский

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Mini-review on the antimicrobial potential of actinobacteria associated with seagrasses

Опубликована: Фев. 29, 2024

The search for novel therapeutic agents to combat the crisis of antimicrobial resistance has spanned from terrestrial unique, marine environments. Currently, most drugs available usage are derived microbial metabolites, especially those belonging bacterial group, actinobacteria. Actinobacteria hotspot organisms that exist in all habitats with a myriad unique biosynthetic metabolites. Seagrasses appear be key ecosystem within coastal environment worth bioprospecting natural products. Unfortunately, literature about bioactive potential their associated prokaryotes, including actinobacteria remains limited. In this context, review focused on antibiotic-producing capabilities different parts seagrass plants (i.e. roots, rhizomes, and leaves). To date, there were no purified molecules seagrass-associated subjected structure elucidation. From underpinning numerous biological profiles such as antibacterial, antifungal, algicidal activities seagrass-derived reported during period 2012–2020, it provides continual growth knowledge accruing overtime, providing foundation future research.

Язык: Английский

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Stabilisation and destabilisation of coastal blue carbon: The key factors

Earth-Science Reviews, Год журнала: 2025, Номер unknown, С. 105133 - 105133

Опубликована: Апрель 1, 2025

Язык: Английский

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Metabolomic signatures of pathogen suppression effect of Baltic eelgrass meadows in surrounding seawater

The Science of The Total Environment, Год журнала: 2025, Номер 979, С. 179518 - 179518

Опубликована: Апрель 27, 2025

Organic molecules exuded into water column by marine organisms represent a significant portion of dissolved organic matter (DOM) that modulates biochemical interactions. Secreted allelochemicals have been suggested to be involved in regulation pathogen abundance seagrass meadows, however, exometabolome has remained unstudied. We aimed identify exometabolites, within and outside explore their potential involvement suppression under varying environmental conditions. collected seawater (SW) samples from eelgrass (Zostera marina)-vegetated (V) non-vegetated (NV) areas across 5 locations spanning 270 km coastline along the German Baltic Sea. Comparative LC-MS/MS-based untargeted computational metabolomics combined with statistical analyses machine learning tools were employed pinpoint (exo)metabolomic signatures leaves. Simultaneously, we measured abiotic parameters three common pathogenic taxa seawater, investigated spatiotemporal variations. Here show correlation biomass reduction effect increasing temperature, eutrophication anthropogenic influences. Exometabolomics studies revealed exudates contributed significantly overall DOM at molecular level, while SW overlying meadows contained many chemical features unique leaf metabolome. identified four flavone aglycones as key biomarkers distinguishing SW-V SW-NV samples. Their drastically increased concentrations correlated lowest biomass, suggesting role regulation. These analytical microbiological approaches indicate flavones are defensive released upon stress serve bioindicators eelgrass' sanitation effect.

Язык: Английский

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