Multiple stressors affect function rather than taxonomic structure of freshwater microbial communities DOI Creative Commons
Rose E. Fuggle, Miguel G. Matias, Mariana Mayer‐Pinto

et al.

npj Biofilms and Microbiomes, Journal Year: 2025, Volume and Issue: 11(1)

Published: April 18, 2025

Microbial community responses to environmental stressors are often characterised by assessing changes in taxonomic structure, but such changes, or lack thereof, may not reflect functional that critical ecosystem processes. We investigated the individual and combined effects of nutrient enrichment ( + 10 mg/L N, 1 P) salinisation 15 g/L NaCl)-key freshwater systems-on structure metabolic function benthic microbial communities using 1000 L open ponds established >10 years ago field. Combined drove strong decreases maximum mean total carbon rates shifted profiles compared either stressor individually ambient conditions. These did recover through time occurred without significant alterations bacterial structure. results imply functions, including organic release, likely be impaired under multiple stressors, even when remains stable.

Language: Английский

Detritivore identity modulates effects of nutrient enrichment and a common fungicide presence on leaf litter decomposition and fungal community DOI Creative Commons
Rui Dong, Kai Peng, Naiara López‐Rojo

et al.

Ecotoxicology and Environmental Safety, Journal Year: 2025, Volume and Issue: 293, P. 118019 - 118019

Published: March 1, 2025

Understanding the interaction of biotic and abiotic factors on ecosystem function is crucial for freshwater management, However, influence nutrient enrichment, fungicide presence, detritivore identity leaf litter decomposition associated fungal communities remains poorly understood. We conducted a microcosm experiment to examine: 1) individual combined effects enrichment common communities; 2) how two types invertebrates (scrapers vs. shredders) these effects. After 35 days, we assessed: decomposition, dissolved organic carbon (DOC) production, activities extracellular enzymes; diversity, community structure, co-occurrence networks communities. found that both fungicides increased enzymatic activity but did not significantly impact diversity. changed structure reduced detritivore-mediated DOC while had opposite effect. In combination, mitigated negative network stability decomposition. selectively influenced taxa, resulting in distinct patterns under different stressors. The and/or also depended identity. This research underscores pivotal role interplay shaping modulating particularly multiple stressors settings, its implications effective management biodiversity conservation.

Language: Английский

Citations

0
Hydrological regimes and Niche Partitioning Drive Fungal Community Structure and Function in Arid Wetlands Sediments of South Africa DOI
Henry Joseph Oduor Ogola, Grace N. Ijoma, Joshua N. Edokpayi

et al.

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: April 2, 2025

Abstract Arid wetlands are ecologically significant yet understudied ecosystems shaped by extreme conditions and hydrological variability. However, the structure ecological functional of fungal communities in these habitats remain poorly understood, especially southern Africa. This study integrated shotgun metagenomics, FUNGuild profiling, multivariate analyses to examine diversity, composition, environmental drivers seasonal permanent arid South Distinct assemblages emerged, primarily regimes ionic stress. Seasonal were dominated Mucoromycota (79%), particularly arbuscular mycorrhizal (AM) fungus (Rhizophagus, 62%), while had higher Ascomycota (54%), with Aspergillus (50%) prevalent oxygen-limited sediments. Although alpha diversity showed no difference, beta confirmed mycobiome differentiation. Total dissolved solids (TDS), electrical conductivity (EC), salinity key predictors TDS strongest determinant (P < 0.01). Functional guild analysis highlighted niche differentiation, saprotrophs dominating (59.7% vs. 21.5%; P 0.05), symbiotrophs, AM fungi, enriched (69.3% 36.1%; 0.001). Indicator taxa identified via LefSe (LDA > 3, 0.05) random forest modeling included Rhizophagus, Trichoderma, Fusarium, Entomophthora wetlands, wetlands. provides first integrative insight into ecology Africa’s demonstrating that regime shapes function through filtering specialization, implications for guiding conservation adaptive management fragile ecosystems.

Language: Английский

Citations

0
Multiple stressors affect function rather than taxonomic structure of freshwater microbial communities DOI Creative Commons
Rose E. Fuggle, Miguel G. Matias, Mariana Mayer‐Pinto

et al.

npj Biofilms and Microbiomes, Journal Year: 2025, Volume and Issue: 11(1)

Published: April 18, 2025

Microbial community responses to environmental stressors are often characterised by assessing changes in taxonomic structure, but such changes, or lack thereof, may not reflect functional that critical ecosystem processes. We investigated the individual and combined effects of nutrient enrichment ( + 10 mg/L N, 1 P) salinisation 15 g/L NaCl)-key freshwater systems-on structure metabolic function benthic microbial communities using 1000 L open ponds established >10 years ago field. Combined drove strong decreases maximum mean total carbon rates shifted profiles compared either stressor individually ambient conditions. These did recover through time occurred without significant alterations bacterial structure. results imply functions, including organic release, likely be impaired under multiple stressors, even when remains stable.

Language: Английский

Citations

0