Microbial Ecology最新文献

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Effects of Geosmin on the Behavior of Soil Protists.
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-03-14 DOI: 10.1007/s00248-025-02510-7
Jamie L Micciulla, Capucine Baubin, Noah Fierer
{"title":"Effects of Geosmin on the Behavior of Soil Protists.","authors":"Jamie L Micciulla, Capucine Baubin, Noah Fierer","doi":"10.1007/s00248-025-02510-7","DOIUrl":"10.1007/s00248-025-02510-7","url":null,"abstract":"<p><p>Geosmin is a volatile organic compound (VOC) produced by a range of different soil microorganisms, and is most commonly recognized for its characteristic \"earthy\" scent evident after rainfall. Though it remains unclear why microorganisms produce geosmin, we know that exposure to geosmin can influence behaviors across a wide range of organisms, serving as both an attractant and a repellant, but geosmin effects on soil protists remain largely unstudied. We investigated how soil protists respond to geosmin exposures, focusing on representatives of three morphological groups of protists, Colpoda sp. (ciliate), Cercomonas sp. (flagellate), and Acanthamoeba castellanii (naked amoeba), testing the hypothesis that geosmin production by bacteria influences soil protist behavior. We conducted experiments to evaluate protist excystment (waking up) and predation responses to geosmin-producing (Streptomyces coelicolor M145) and non-producing (S. coelicolor J3003) bacteria, as well as synthetic geosmin. All three protists excysted at higher rates when exposed to geosmin-producing bacteria or synthetic geosmin, while no significant excystment occurred with the non-producing strains or in the absence of synthetic geosmin. Protist feeding preferences were also affected, with two of the three protists (Cercomonas sp. and A. castellanii) less likely to predate geosmin-producing versus non-producing bacterial strains. Our findings suggest that soil protists can detect geosmin as a signal indicating favorable soil conditions and geosmin production by bacteria may serve as a deterrent to predation by protists. More generally, our results highlight the ecological significance of geosmin in the soil food web and its role in mediating bacteria-protist interactions.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"14"},"PeriodicalIF":3.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11909094/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Soil Microbial Recovery to the Rubber Tree Replanting Process in Ivory Coast. 象牙海岸橡胶树重新种植过程中的土壤微生物恢复。
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-03-13 DOI: 10.1007/s00248-025-02506-3
Aymard Kouakou Kouakou, Paul Collart, Thibaut Perron, Yeo Kolo, Frédéric Gay, Alain Brauman, Caroline Brunel
{"title":"Soil Microbial Recovery to the Rubber Tree Replanting Process in Ivory Coast.","authors":"Aymard Kouakou Kouakou, Paul Collart, Thibaut Perron, Yeo Kolo, Frédéric Gay, Alain Brauman, Caroline Brunel","doi":"10.1007/s00248-025-02506-3","DOIUrl":"10.1007/s00248-025-02506-3","url":null,"abstract":"<p><p>The resistance and resilience of soil microbial communities to an environmental disturbance are poorly documented, due to the lack on onfield diachronic experiments, limiting our ability to design adapted agroecological practices. This is especially true in rubber plantations, one of the most planted tree in tropical areas. We aimed to understand (1) how soil disturbances occurring during the rubber replanting phase affect the soil microbiome, (2) how agricultural practices combining legumes cover crops and tree logging residues shape community resilience and (3) how microbial responses vary across different edaphic contexts. In two plantations with distinct soil properties in Ivory Coast, soil microbial communities were surveyed every 6 months for 24 months after soil perturbation. Community structure, functioning and networks were described based on a 16S/18S rRNA gene investigation. Prokaryotes were generally more resistant to soil perturbation than microeukaryote communities. Prokaryotic resilience dynamics were faster than those of microeukaryotes, the latter being deeply modulated by cover treatments. These specific dynamics were exacerbated in the sandy site. Co-occurrence network modelling provided useful insights into microbial resilience trajectories. We argue that this tool should be more widely used to describe microbial community dynamics. Practices involving a combination of logging residues and legume cover crops have shown beneficial effects on the community resilience in the sandy site and appears as promising agroecological practices. However, the major influence of soil texture warns of the need to consider pedological context when designing pertinent agroecological practices.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"13"},"PeriodicalIF":3.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11906521/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143625462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diversity and Structure of the Prokaryotic Community in Tropical Monomictic Reservoir.
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-03-12 DOI: 10.1007/s00248-025-02508-1
Mariel Barjau-Aguilar, Ana M J Reyes-Hernández, Martín Merino-Ibarra, Gloria Vilaclara, Jorge Alberto Ramírez-Zierold, Rocío J Alcántara-Hernández
{"title":"Diversity and Structure of the Prokaryotic Community in Tropical Monomictic Reservoir.","authors":"Mariel Barjau-Aguilar, Ana M J Reyes-Hernández, Martín Merino-Ibarra, Gloria Vilaclara, Jorge Alberto Ramírez-Zierold, Rocío J Alcántara-Hernández","doi":"10.1007/s00248-025-02508-1","DOIUrl":"10.1007/s00248-025-02508-1","url":null,"abstract":"<p><p>Bacteria and Archaea are microorganisms that play key roles in the biogeochemical transformations that control water quality in freshwater ecosystems, such as in reservoirs. In this study, we characterize the prokaryotic community of a high-relevance tropical eutrophic reservoir using a 16S rRNA gene survey during a low-water level fluctuation period mainly used for storage, associating the distribution of these microorganisms with the hydrogeochemical conditions of the water column. Our findings revealed that diversity and structure of the prokaryotic community exhibited spatio-temporal variations driven by the annual circulation-stratification hydrodynamic cycle and are significantly correlated with the concentrations of dissolved oxygen (DO), soluble reactive phosphorus (SRP), and dissolved inorganic nitrogen (DIN). During the heterotrophic circulation, the breakdown of thermal gradient leads to a homogeneous distribution of the nutrients, where the presence of DO promotes the dominance of aerobic and facultative heterotrophic bacteria such as Bacteroidota, Actinobacteriota, and Verrucomicrobiota. Also, the autotrophic circulation was characterized by an increase of DO and NO<sub>3</sub><sup>-</sup> concentrations, with abundant Cyanobacteria. Finally, during the stratification, the presence of prokaryotes associated with the metabolism of CH<sub>4</sub> was detected, mainly in the hypolimnion, as well as others related to sulfate reduction and nitrification. This study shows the diversity of the prokaryotic community in tropical eutrophic reservoirs, and how the continuous monitoring with metabarcoding techniques can provide critical insights for a deeper understanding of the biogeochemical dynamics and improve the water resource management in the future.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"12"},"PeriodicalIF":3.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11903632/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143616099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diversity and Symbiotic Associations of Endophytic Fungi in Calotropis procera (Aiton) W.T. Aiton (Asclepiadaceae) Across Three Egyptian Regions: Phenotypic Characterization and Mitotic Activity.
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-03-05 DOI: 10.1007/s00248-025-02503-6
Hoida Zaki, Mohamed A Hussein, Eman G A M El-Dawy
{"title":"Diversity and Symbiotic Associations of Endophytic Fungi in Calotropis procera (Aiton) W.T. Aiton (Asclepiadaceae) Across Three Egyptian Regions: Phenotypic Characterization and Mitotic Activity.","authors":"Hoida Zaki, Mohamed A Hussein, Eman G A M El-Dawy","doi":"10.1007/s00248-025-02503-6","DOIUrl":"10.1007/s00248-025-02503-6","url":null,"abstract":"<p><p>Endophytic fungi are essential contributors to fungal biodiversity, playing key roles in plant defense against pathogens, alleviation of abiotic stress, and promotion of growth. This study conducted a comprehensive survey of the phenotypic characterization of Calotropis procera and its associated endophytic fungi across three regions in Egypt: Qena-Safaga, Qena, and Qena-Kosseir. Positive and significant Pearson correlations among plant morphological traits suggest intrinsic connections. Fungal species diversity exhibited significant variation across the three regions examined. Particularly, the Qena-Kosseir region demonstrated the highest fungal species richness both in soil samples and endophytic fungi. Unique to this region, Allocanariomyces tritici, Aspergillus terreus, Chaetomium globosum, C. murorum, Cladosporium cladosporioides, C. sphaerospermum, Fusarium proliferatum, Penicillium crustosum, P. granulatum, P. spinuloseum, and Roussoella intermedia were identified as endophytes. Additionally, compared to other regions, the Qena-Kosseir area exhibited the presence of Aspergillus fumigatus, A. ochraceus, A. ornatus, A. sclerotiocabonarus, Drechslera halodes, Emericella echinulata, Fusarium oxysporum, and Macrophomina phaseolina in soil samples, underscoring its distinct fungal community composition. Furthermore, antimitotic assays using the Allium cepa test revealed distinct effects of endophytic extracts on various mitotic stages. Of the 33 treatments, 11 showed an increase in the mitotic index (MI), indicating a potential positive effect on plant growth and cell division. This study offers valuable insights into the diversity and functional roles of endophytic fungi associated with C. procera, highlighting their promising applications in sustainable agriculture and plant health management.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"10"},"PeriodicalIF":3.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11882703/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143557352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Construction of Phosphate-Solubilizing Microbial Consortium and Its Effect on the Remediation of Saline-Alkali Soil.
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-03-05 DOI: 10.1007/s00248-024-02485-x
Ting Zhang, Xue-Li Wang, Juan Zhou, Wei Zhou, Shao-Qi Zhou
{"title":"Construction of Phosphate-Solubilizing Microbial Consortium and Its Effect on the Remediation of Saline-Alkali Soil.","authors":"Ting Zhang, Xue-Li Wang, Juan Zhou, Wei Zhou, Shao-Qi Zhou","doi":"10.1007/s00248-024-02485-x","DOIUrl":"10.1007/s00248-024-02485-x","url":null,"abstract":"<p><p>In this study, phosphate solubilizing bacteria (PSB) with good phosphate-solubilizing capability were isolated from phosphogypsum (PG) storage yard, and phosphate-solubilizing bacteria without antagonistic effect were selected to construct phosphate solubilizing microbial consortium (PSMC), and the synergistic effect of PSMC and PG on the physical and chemical properties of saline-alkali soil, soil enzyme activity, soil bacterial diversity, and the growth index and biomass of peanut plants were explored. The results showed that the effect of phosphorus containing soil amendment on saline-alkali soil was better than that of single PSMC or PG. In the T6 group (untreated saline-alkali soil (1.5 kg) + PSMC stock solution (15 mL) + PG (6.0 g)), the pH of saline-alkali soil decreased from 8.54 to 7.03, the content of organic matter increased by 6.64%, the content of alkali hydrolyzable nitrogen, available phosphorus and available potassium increased by 81.68%, 60.31%, and 42.03%, respectively, and the activity of alkaline phosphatase increased by 94.95%. In addition, the electrical conductivity value in T4 group (untreated saline-alkali soil (1.5 kg) + PSMC stock solution (15 mL) + PG (3.0g)) decreased significantly by 20.21%. The diversity and richness of bacterial community in T4 group were the highest, and the growth of peanut plants was the best. The fresh weight of roots and stems increased by 73.34% and 116.6%, respectively. In conclusion, the phosphorus containing soil conditioner prepared by PSMC and PG can effectively improve the soil environment of saline-alkali soil and promote the resource utilization of saline alkali soil.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"11"},"PeriodicalIF":3.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11882712/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143557350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Cyanobacterial Oxadiazine Nocuolin A Shows Broad-Spectrum Toxicity Against Protozoans and the Nematode C. elegans.
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-03-04 DOI: 10.1007/s00248-025-02507-2
Ana R Vieira, Francisco Camacho, Maria L Sousa, Sara Luelmo, Nuno Santarém, Anabela Cordeiro-da-Silva, Pedro N Leão
{"title":"The Cyanobacterial Oxadiazine Nocuolin A Shows Broad-Spectrum Toxicity Against Protozoans and the Nematode C. elegans.","authors":"Ana R Vieira, Francisco Camacho, Maria L Sousa, Sara Luelmo, Nuno Santarém, Anabela Cordeiro-da-Silva, Pedro N Leão","doi":"10.1007/s00248-025-02507-2","DOIUrl":"10.1007/s00248-025-02507-2","url":null,"abstract":"<p><p>Cyanobacteria, known to be rich sources of valuable natural products (NPs) with relevant biological properties, are a unique subject to study the interplay between chemistry and ecology. Cultivation of cyanobacteria as isolated strains may only reveal a small fraction of their NPs. In contrast, investigating microbial interactions from an ecological perspective is a particularly fruitful approach to unveil both new chemistry and bioactivity. Cyanobacteria and amoebae are known to co-exist in diverse environments, but the interaction between these organisms has been poorly investigated. Defense strategies against grazer organisms may rely on morphological changes including biofilm formation or increased motility; however, secretion of toxic metabolites seems to be more effective on this regard. Among the most structurally unique cyanobacterial secondary metabolites is nocuolin A, an 1,2,3-oxadiazine metabolite isolated from the cyanobacterial strain Nodularia sp. LEGE 06071 that exhibits potent anti-proliferative activity against several human cancer lines, associated with impairment of mitochondrial oxidative phosphorylation. In this work, we show that nocuolin A is toxic against two well-known model amoebae, Acanthamoeba and Dictyostelium, leading to amoebae encystation and decrease in viability. In addition, in lawn grazing assays, we observed that Nodularia sp. LEGE 06071, the producer strain of nocuolin A, was not grazed by amoeba, while a related strain, which does not produce detectable levels of nocuolin A, was. These results support the possible involvement of nocuolin A as a chemical mediator during the interaction between these organisms. Furthermore, we show that this cyanobacterial metabolite also exhibits potent toxicity against other protozoan organisms and a free-living nematode, making it an interesting broad-spectrum scaffold for the development of antiprotozoal or anti-helminthic drugs.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"9"},"PeriodicalIF":3.3,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11880066/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143542619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancing Soil Health Through Biocrusts: A Microbial Ecosystem Approach for Degradation Control and Restoration. 通过生物簇增强土壤健康:控制退化和恢复的微生物生态系统方法。
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-02-22 DOI: 10.1007/s00248-025-02504-5
Longkat Ayuba Gufwan, Liu Peng, Nkiruka May Gufwan, Shubin Lan, Li Wu
{"title":"Enhancing Soil Health Through Biocrusts: A Microbial Ecosystem Approach for Degradation Control and Restoration.","authors":"Longkat Ayuba Gufwan, Liu Peng, Nkiruka May Gufwan, Shubin Lan, Li Wu","doi":"10.1007/s00248-025-02504-5","DOIUrl":"10.1007/s00248-025-02504-5","url":null,"abstract":"<p><p>Escalating global concerns about soil degradation, driven by erosion, salinization, compaction, pollution, and organic matter loss, highlights the critical need for sustainable remediation. Biocrusts-complex communities of cyanobacteria, algae, lichens, bryophytes, and fungi-play a pivotal role in soil stabilization, erosion prevention, and nutrient cycling. This study presents recent advancements in biocrust application for soil management and restoration, focusing on artificial biocrusts as a nature-based solution biotechnology. It emphasizes their effectiveness in enhancing soil quality, biodiversity, and ecosystem functionality. Researchers are leveraging these microbial communities to develop strategies that improve soil health and rehabilitate degraded landscapes. The review concludes that biocrusts are a viable strategy for boosting soil resilience and enhancing soil health against environmental stressors. It recommends future research on their long-term ecological impacts and methods to enhance their functionality.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"8"},"PeriodicalIF":3.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11846762/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143476749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Yeasts Prefer Daycares and Molds Prefer Private Homes.
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-02-20 DOI: 10.1007/s00248-025-02505-4
Håvard Kauserud, Pedro M Martin-Sanchez, Eva Lena Estensmo, Synnøve Botnen, Luis Morgado, Sundy Maurice, Klaus Høiland, Inger Skrede
{"title":"Yeasts Prefer Daycares and Molds Prefer Private Homes.","authors":"Håvard Kauserud, Pedro M Martin-Sanchez, Eva Lena Estensmo, Synnøve Botnen, Luis Morgado, Sundy Maurice, Klaus Høiland, Inger Skrede","doi":"10.1007/s00248-025-02505-4","DOIUrl":"10.1007/s00248-025-02505-4","url":null,"abstract":"<p><p>Worldwide, people spend most of their time indoors; in their homes, workplaces, schools, and daycares. Indoor fungi can cause negative health effects due to the production of toxins or volatiles that trigger the immune system of the occupants. To what degree indoor fungi (mycobiomes) differ between buildings with different usage is poorly known. Here, we compare the indoor mycobiomes in 123 children's daycare centers and 214 private homes throughout Norway, as revealed by metabarcoding of DNA extracted from dust samples collected by community scientists. Although the fungal richness per se was similar in dust samples from daycares and homes, the fungal community composition differed. Yeast fungi, distributed mainly across the orders Saccharomycetales, Filobasidiales, and Tremellales, were proportionally more abundant in the daycares, while filamentous fungi, including spore-producing molds such as Aspergillus, Penicillum, and Cladosporium, were relatively more abundant in homes. Number of occupants, which is considerably higher in daycares, correlated significantly with the fungal community shift. We hypothesize that the density of occupants and their age distribution drive the systematic difference of yeasts and filamentous fungi in the two building types.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"7"},"PeriodicalIF":3.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11842513/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quinolone Resistance Genes qnr, aac(6')-Ib-cr, oqxAB, and qepA in Environmental Escherichia coli: Insights into Their Genetic Contexts from Comparative Genomics.
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-02-17 DOI: 10.1007/s00248-025-02502-7
Ryota Gomi, Fumie Adachi
{"title":"Quinolone Resistance Genes qnr, aac(6')-Ib-cr, oqxAB, and qepA in Environmental Escherichia coli: Insights into Their Genetic Contexts from Comparative Genomics.","authors":"Ryota Gomi, Fumie Adachi","doi":"10.1007/s00248-025-02502-7","DOIUrl":"10.1007/s00248-025-02502-7","url":null,"abstract":"<p><p>Previous studies have reported the occurrence of transferable quinolone resistance determinants in environmental Escherichia coli. However, little is known about their vectors and genetic contexts. To gain insights into these genetic characteristics, we analyzed the complete genomes of 53 environmental E. coli isolates containing one or more transferable quinolone resistance determinants, including 20 sequenced in this study and 33 sourced from RefSeq. The studied genomes carried the following transferable quinolone resistance determinants alone or in combination: aac(6')-Ib-cr, oqxAB, qepA1, qnrA1, qnrB4, qnrB7, qnrB19, qnrD1, qnrS1, and qnrS2, with qnrS1 being predominant. These resistance genes were detected on plasmids of diverse replicon types; however, aac(6')-Ib-cr, qnrS1, and qnrS2 were also detected on the chromosome. The genetic contexts surrounding these genes included not only those found in clinical isolates but also novel contexts, such as qnrD1 embedded within a composite transposon-like structure bounded by Tn3-derived inverted-repeat miniature elements (TIMEs). This study provides deep insights into mobile genetic elements associated with transferable quinolone resistance determinants, highlighting the importance of genomic surveillance of antimicrobial-resistant bacteria in the environment.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"6"},"PeriodicalIF":3.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11832570/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143441497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dual-Domain Primary Succession of Bacteria in Glacier Forefield Streams and Soils of a Maritime and Continental Glacier.
IF 3.3 3区 生物学
Microbial Ecology Pub Date : 2025-02-15 DOI: 10.1007/s00248-024-02486-w
Ze Ren, Hongkai Gao, Nicolas Martyniuk, Heng Ren, Xiong Xiong, Wei Luo
{"title":"Dual-Domain Primary Succession of Bacteria in Glacier Forefield Streams and Soils of a Maritime and Continental Glacier.","authors":"Ze Ren, Hongkai Gao, Nicolas Martyniuk, Heng Ren, Xiong Xiong, Wei Luo","doi":"10.1007/s00248-024-02486-w","DOIUrl":"10.1007/s00248-024-02486-w","url":null,"abstract":"<p><p>Glaciers retreat rapidly and create newly exposed terrestrial and aquatic habitats in glacier forefields, where primary succession proceeds synchronously in glacier forefields. Here, we introduced the \"Dual-Domain Primary Succession\" concept to examine the parallel yet distinct primary succession processes in soil and stream ecosystems within glacier forefields, by focusing on Hailuogou Glacier and Urumqi Glacier No.1 in China. Findings showed that soil bacterial communities exhibited higher α-diversity with a decreasing pattern in Hailuogou Glacier, in contrast to Urumqi Glacier No.1, which displayed lower and unimodally distributed α-diversity along the glacier forefield chronosequence (GFC). A similar pattern emerged in streams, except for an increasing α-diversity trend in Urumqi Glacier No.1 stream along the GFC. Additionally, α-diversity in streams changed more rapidly than in soils for Hailuogou Glacier, but more slowly for Urumqi Glacier No.1. Along GFC, both soil and stream bacterial communities experienced spatial variations, primarily due to species turnover. The succession of community composition was evident at the OTU level, with each module in the co-occurrence network consisting of OTUs enriched at specific successional stages. A substantial number of OTUs shared between paired soil and stream samples showed a decreasing trend along the GFC, while β-diversity increased. The results suggested that bacterial communities have a similar succession pattern but in different pace between soil and stream while having distinct successional trajectories between the studied glaciers. This study highlighted the \"Dual-Domain Primary Succession\" in glacier forefields, but further studies with more glaciers are necessary to make broader generalizations.</p>","PeriodicalId":18708,"journal":{"name":"Microbial Ecology","volume":"88 1","pages":"5"},"PeriodicalIF":3.3,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11829940/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143425820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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