Environmental microbiome diversity and stability is a barrier to antimicrobial resistance gene accumulation

Communications Biology, Journal Year: 2024, Volume and Issue: 7(1)

Published: June 8, 2024

Abstract When antimicrobial resistant bacteria (ARB) and genes (ARGs) reach novel habitats, they can become part of the habitat’s microbiome in long term if are able to overcome biotic resilience towards immigration. This process should more difficult with increasing biodiversity, as exploitable niches a given habitat reduced for immigrants when diverse competitors present. Consequently, microbial diversity could provide natural barrier resistance by reducing persistence time immigrating ARB ARG. To test this hypothesis, pan-European sampling campaign was performed structured forest soil dynamic riverbed environments low anthropogenic impact. In soils, higher diversity, evenness richness were significantly negatively correlated relative abundance >85% ARGs. Furthermore, number detected ARGs per sample inversely diversity. However, no such effects present riverbeds. Hence, serve dissemination stationary, environments, where long-term, diversity-based against immigration evolve.

Language: Английский

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Assessing the Complex Effects of the Invasive Amphipod Dikerogammarus villosus on Leaf Litter Breakdown in Rivers

Freshwater Biology, Journal Year: 2025, Volume and Issue: 70(2)

Published: Feb. 1, 2025

ABSTRACT Allochthonous organic matter is an essential resource of aquatic food webs, and freshwater amphipods, particularly species the genus Gammarus , play a significant role in leaf litter decomposition. However, this important ecological function may be affected by invasion alien amphipods such as Dikerogammarus villosus which has been reported to show lower decay rates than native gammarids. The aim study was determine whether D. would disrupt breakdown under field conditions comparing at invaded uninvaded river sites. experiment conducted six locations, four Croatia two Germany, with one site upstream downstream front each location. At site, we placed preconditioned willow leaves sampled them three times estimate invertebrate colonisation. We hypothesized that higher sites without (upstream front) compared Contrary hypothesis, results indicated contrasting obviously context dependent outcomes. This indicates change but no general disruption processing omnivorous even when it displaces shredders. outcome experiments most probably depended on biomass shredders bags. locations low bags, presence showed high shredders, had These findings underscore complex interactions between invasive ecosystems their potential impact ecosystem services.

Language: Английский

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Natural range expansion promotes stress resistance as a component of dispersal syndromes in non‐native insects

Oikos, Journal Year: 2025, Volume and Issue: unknown

Published: March 19, 2025

Global changes and human activities have increased the likelihood of transport non‐native insect species all around globe. When established, spread organisms leads to spatial sorting populations, progressively contributing selection individuals with enhanced dispersal performance at edges invaded range. During dispersal, propagules are also subjected contrasting environmental conditions that can be stressful. These include temperature extremes variations, desiccation quantity quality food, which impose physiological constraints. As a consequence, higher stress tolerance capacities may promoted range edge. However, only few studies examined differences in resistance populations along their invasion gradient. Merizodus soledadinus is invading low‐elevation coastal areas subantarctic Kerguelen Islands, where its quick highly impacts native fauna. On history precisely known. This offers unique opportunity study relation residence time. In this study, we investigated effects time M. on heat, desiccation, food deprivation combination these three stresses laboratory. We found multiple treatments caused highest mortality rates. Populations close edge showed longer survival compared times. dynamics were different: core experienced steady decline survival, while initially slow followed by rapid mortality. suggests greater for from front, potentially explaining intense expansion Islands.

Language: Английский

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Functional and Taxonomic Diversity is Associated With Resource Use Efficiency in Epilithic Algae of Subtropical Qinhuai River, China

Freshwater Biology, Journal Year: 2025, Volume and Issue: 70(4)

Published: April 1, 2025

ABSTRACT The effects of biodiversity on ecosystem functioning comprise a central ecological theorem (BEF), because more diverse communities are expected to perform better, for example, in terms resource use efficiency (RUE). Although affects functioning, it is seriously constrained by global environmental change. Epilithic algae crucial benthic functional group aquatic food webs, but the effect their yet be understood. Here, we compared capacity taxonomic versus richness and evenness predict RUE dataset epilithic from Qinhuai River, Nanjing, China. We examined associations between variables diversity (response indication), assessed whether measures predicted (quantified as total algal biomass standardised phosphorus (RUE TP ), nitrogen TN )). Taxonomic varied across seasons than space, peaking spring summer association with pronounced changes. Water temperature nutrient concentrations positively significantly measures. associated RUE, while negatively associated. However, was not related RUE. Structural equation modelling showed that were . strongly predictive diversity. Our results suggest closely linked species diversity, provides complementary approach better understanding mechanisms underlying BEF relationship large rivers. using approaches way gain deeper interplay among factors, community functioning.

Language: Английский

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Water quality deterioration remains a major stressor for macroinvertebrate, diatom and fish communities in German rivers

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 907, P. 167994 - 167994

Published: Oct. 22, 2023

About 60 % of Europe's rivers fail to meet ecological quality standards derived from biological criteria. The causes are manifold, but recent reports suggest a dominant role hydro-morphological and water quality-related stressors. Yet, in particular micropollutants hydrological stressors often tend be underrepresented multiple-stressor studies. Using monitoring data four Federal States Germany, this study investigated the effects 19 stressor variables six groups (nutrients, salt ions, dissolved oxygen/water temperature, mixture toxicity 51 micropollutants, alteration morphological habitat quality) on three assemblages (fishes, macroinvertebrates, benthic diatoms). Biological were analyzed for 35 community metrics quantified using Random Forest (RF) analyses put into hierarchical context. To compare metric responses, grouped categories reflecting important characteristics communities, such as sensitivity, functional traits, diversity composition well composite indices that integrate several one single index (e.g., class). Water - not turned out dominate responses all assemblages. In contrast, less pronounced stronger than Explained variances RF models ranged 23-64 16-40 diatoms 18-48 fishes. Despite high variability across groups, sensitivity tended reveal individual higher explained variance indices. results (physico-chemical) deterioration continues impact many German rivers, despite extensive progress wastewater treatment during past decades. detect deterioration, schemes need target relevant physico-chemical micropollutants. Furthermore, needs measures flow magnitude dynamics). At present, surveys rarely address degree alteration. order achieve good status, river restoration management both Restricting just organism group macroinvertebrates) or only selected class) may hamper identification its classification and, thus mislead management.

Language: Английский

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Microbiome diversity: A barrier to the environmental spread of antimicrobial resistance?

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2023, Volume and Issue: unknown

Published: March 30, 2023

Abstract Background In the environment, microbial communities are constantly exposed to invasion by antimicrobial resistant bacteria (ARB) and their associated resistance genes (ARGs) that were enriched in anthroposphere. A successful invader has overcome biotic resilience of habitat, which is more difficult with increasing biodiversity. The capacity exploit resources a given habitat enhanced when exhibit greater diversity, reducing opportunities for invaders, leading lower persistence. context (AMR) dissemination, exogenous ARB reaching natural community may persist longer if biodiversity autochthonous low, chance ARGs transfer members. Reciprocally, high diversity could serve as long-term barrier towards ARGs. Results To test this hypothesis, sampling campaign across seven European countries was carried out obtain 172 environmental samples from sites low anthropogenic impact. Samples collected contrasting environments: stationary structured forest soils, or dynamic river biofilms sediments. Microbial relative abundance 27 5 mobile genetic element marker determined. higher evenness richness all significantly negatively correlated majority (>85%) Furthermore, number detected per sample inversely diversity. However, no such effects found dynamic, regularly mixed rivers. Conclusions: conclusion, we demonstrate can AMR dissemination environment. This effect mainly observed stationary, environments, where long-term, diversity-based against evolve. Such future be exploited limit proliferation AMR.

Language: Английский

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Hydromorphological degradation modifies long-term macroinvertebrate responses to water quality and climate changes in lowland rivers

Environmental Research, Journal Year: 2024, Volume and Issue: 261, P. 119638 - 119638

Published: July 18, 2024

Language: Английский

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Multidimensional Aspects of Riverine Biodiversity Can Vary in Response to Nutrient Pollution and Environmental Dynamics Across Climatic Watersheds

Environmental Pollution, Journal Year: 2024, Volume and Issue: 361, P. 124775 - 124775

Published: Aug. 22, 2024

Language: Английский

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Spatial asymmetry of temporal ecological processes can shift in riverine macroinvertebrates responding to fluctuating climate conditions

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 952, P. 175872 - 175872

Published: Aug. 30, 2024

Language: Английский

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Temporal ecological processes have different seasonal influences on multiple dimensions of riverine insect diversity in China

Insect Conservation and Diversity, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 20, 2024

Abstract An understanding of the relative importance ecological processes affecting biological communities can assist in interpretations biodiversity patterns. However, mechanism behind temporal beta diversity, which refers to dissimilarity between community structures at different times, remains unclear for aquatic insect communities. Therefore, we collected monthly samples insects five sites streams from July 2011 June 2012 Central China. The sample were located river sections with perennially flowing water, subject little human disturbance. We examined taxonomic‐ and trait‐based diversity patterns riverine across seasons sites. Taxonomic‐ demonstrated a decline species richness but an increase time sampling dates. Taxonomic‐based was significantly higher than diversity. Turnover (i.e. replacement) main driver taxonomic‐based whereas nestedness gain or loss) contributed more beta‐diversity values. In addition, correlation weak. Deterministic operating through physico‐chemical factors climate) stochastic variables) are distinct, they act together influencing insects. sensitive environmental changes taxonomic shift do not necessarily result trait changes. changed location components analysed. contrast, most dominant influence on Results suggest that conservation measures should consider both turnover protection China elsewhere. Additionally, development integrated monitoring management protocols apply life stages be considered.

Language: Английский

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