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FEMS Microbiology Ecology

Chonthicha Pakwan, Martin Kaltenpoth, Benjamin Weiss, Panuwan Chantawannakul, Guo Jun, Terd Disayathanoowat
Varroa and Tropilaelaps mites have been reported as serious ectoparasites of honey bees (Apis mellifera). In this study, bacterial communities associated with Varroa destructor and Tropilaelaps mercedesae from Northern Thailand were determined, using both culture-dependent and culture-independent approaches. Adult female mites were collected from apiaries in Chiang Mai and Lampang provinces. Culturable bacteria were isolated from individual mites. On average, we observed approximately 1340 and 1140 CFU/mite in Varroa and Tropilaelaps, respectively...
November 14, 2017: FEMS Microbiology Ecology
Mei C Ooi, Evan F Goulden, Gregory G Smith, Barbara F Nowak, Andrew R Bridle
With recent technologies making it possible for commercial scale closed life-cycle aquaculture production of spiny lobster (Panulirus ornatus) comes a strong impetus to further understand aspects of lobster health. The gut microbiome plays a crucial role in host health, affecting growth, digestion, immune responses and pathogen resistance. Herein we characterise and compare gut microbiomes across different developmental stages (6-7 d post-emergence [dpe], 52 dpe and 13 months post-emergence [mpe]) and gut regions (foregut, midgut and hindgut) of cultured P...
November 14, 2017: FEMS Microbiology Ecology
Akihiro Koyama, J Megan Steinweg, Michelle L Haddix, Jeffrey S Dukes, Matthew D Wallenstein
The structure and function of soil microbiomes often change in response to experimental climate manipulations, suggesting an important role in ecosystem feedbacks. However, it is difficult to know if microbes are responding directly to environmental changes or are more strongly impacted by plant responses. We investigated soil microbial responses to precipitation and temperature manipulations at the Boston-Area Climate Experiment in Massachusetts, USA in both vegetated and bare plots to parse direct vs plant-mediated response to multi-factor climate change...
November 14, 2017: FEMS Microbiology Ecology
Leonardo Mancabelli, Christian Milani, Gabriele Andrea Lugli, Francesca Turroni, Deborah Cocconi, Douwe van Sinderen, Marco Ventura
Intestinal diseases, such as Crohn's disease (CD), ulcerative colitis (UC) and pseudomembranous colitis (CDI), are among the most common diseases in humans and may lead to more serious pathologies, e.g. colorectal cancer (CRC). Next Generation Sequencing has in recent years allowed the identification of correlations between intestinal bacteria and diseases, although formulation of universal gut microbial biomarkers for such diseases is only in its infancy. In the current study, we selected and reanalyzed a total of 3048 public datasets obtained from 16S rRNA profiling of individuals affected by CD, UC, CDI and CRC...
November 8, 2017: FEMS Microbiology Ecology
Ilkka Kajala, Jordyn Bergsveinson, Vanessa Friesen, Anna Redekop, Riikka Juvonen, Erna Storgårds, Barry Ziola
In 2010, bottles of beer containing viable bacteria of the common beer-spoilage species Lactobacillus backii and Pediococcus damnosus were recovered from a shipwreck near the Åland Islands, Finland. The 170-year quiescent state maintained by the shipwreck bacteria presented a unique opportunity to study lactic acid bacteria (LAB) evolution vis a vis growth and survival in the beer environment. Three shipwreck bacteria (one L. backii strain and two P. damnosus strains) and modern-day beer-spoilage isolates of the same two species were genome sequenced, characterized for hop iso-α-acid tolerance, and growth in degassed lager and wheat beer...
November 8, 2017: FEMS Microbiology Ecology
Xiaohong Wu, Tida Ge, Wende Yan, Juan Zhou, Xiaomeng Wei, Liang Chen, Xiangbi Chen, Paolo Nannipieri, Jinshui Wu
In this study, we assessed the interactive effects of phosphorus (P) application and irrigation methods on the abundances of marker genes (cbbL, cbbM, accA, and aclB) of CO2-fixing autotrophs. We conducted rice-microcosm experiments using a P-limited paddy soil, with and without the addition of P fertiliser (P versus CK), and using two irrigation methods, namely alternate wetting and drying (AWD) and continuous flooding (CF). The abundances of bacterial 16S rRNA, archaeal 16S rRNA, cbbL, cbbM, accA, and aclB genes in the rhizosphere soil (RS) and bulk soil (BS) were quantified...
November 8, 2017: FEMS Microbiology Ecology
Anna Dragoš, Nivedha Lakshmanan, Marivic Martin, Balázs Horváth, Gergely Maróti, Carolina Falcón García, Oliver Lieleg, Ákos T Kovács
Microbial biofilms are tightly packed, heterogeneous structures that serve as arenas for social interactions. Studies on Gram negative models reveal that during evolution in structured environments like biofilms, isogenic populations commonly diversify into phenotypically and genetically distinct variants. These variants can settle in alternative biofilm niches and develop new types of interactions that greatly influence population productivity. Here, we explore the evolutionary diversification of pellicle biofilms of the Gram positive, spore-forming bacterium Bacillus subtilis...
November 8, 2017: FEMS Microbiology Ecology
Vojtech Tláskal, Petra Zrustová, Tomáš Vrška, Petr Baldrian
Dead wood represents an important pool of organic matter in forests and is one of the sources of soil formation. It has been shown to harbour diverse communities of bacteria, but their roles in this habitat are still poorly understood. Here, we describe the bacterial communities in the dead wood of Abies alba, Picea abies and Fagus sylvatica in a temperate natural forest in Central Europe. An analysis of environmental factors showed that decomposing time along with pH and water content were the strongest drivers of community composition...
November 8, 2017: FEMS Microbiology Ecology
Hang T Dam, John Vollmers, Anne-Kristin Kaster, Max M Häggblom
Polychlorinated dibenzo-p-dioxin (PCDD) contaminated sites are widespread and associated with a variety of anthropogenic sources. PCDDs and other organohalide pollutants can serve as terminal electron acceptors for anaerobic respiration by specialized bacteria containing reductive dehalogenases (RdhA). These microorganisms, therefore, play an important role in bioremediation of PCDD contaminated sites. Two anaerobic enrichment cultures established using sediments collected from the PCDD polluted Hackensack (USA) and Kymijoki (Finland) rivers showed robust reductive dechlorination of 1,2,3,4-tetrachlorodibenzo-p-dioxin (1,2,3,4-TeCDD)...
November 3, 2017: FEMS Microbiology Ecology
Sebastian L Hausmann, Britta Tietjen, Matthias C Rillig
Flower nectar is a sugar-rich ephemeral habitat for microorganisms. Nectar-borne yeasts are part of the microbial community and can affect pollination by changing nectar chemistry, attractiveness to pollinators or flower temperature if yeast population densities are high. Pollinators act as dispersal agents in this system, however, pollination events lead potentially to shrinking nectar yeast populations.We here examine how sufficiently high cell densities of nectar yeast can develop in a flower. In laboratory experiments, we determined the remaining fraction of nectar yeast cells after nectar removal, and used honeybees to determine the number of transmitted yeast cells from one flower to the next...
November 2, 2017: FEMS Microbiology Ecology
Huan Li, Tongtong Li, Aileen Berasategui, Junpeng Rui, Xiao Zhang, Chaonan Li, Zhishu Xiao, Xiangzhen Li
The mammalian microbial communities in the gastrointestinal tract (GIT) play important roles in host nutrition and health. However, we still lack an understanding of how these communities are organized across GIT in natural environments. Here, using 16S rRNA gene sequencing, we analyzed the bacterial community diversity, network interactions and ecosystem stability across five gut regions (mouth, stomach, small intestine, caecum and colon) emanating from two common pika species in China, including Plateau pikas (Ochotona curzoniae) inhabiting high-altitude regions, as well as Daurian pikas (O...
November 2, 2017: FEMS Microbiology Ecology
Parisa Noorian, Hu Jie, Zhiliang Chen, Staffan Kjelleberg, Marc R Wilkins, Shuyang Sun, Diane McDougald
Protozoan predation is one of the main environmental factors constraining bacterial growth in aquatic environments, and thus has led to the evolution of a number of defence mechanisms that protect bacteria from predation. These mechanisms may also function as virulence factors in infection of animal and human hosts. Whole transcriptome shotgun sequencing of Vibrio cholerae biofilms during predation by the amoebae, Acanthamoeba castellanii, revealed that 131 transcripts were significantly differentially regulated when compared to the non-grazed control...
October 31, 2017: FEMS Microbiology Ecology
Hongchen Jiang, Yongqin Liu, Gary King
No abstract text is available yet for this article.
October 30, 2017: FEMS Microbiology Ecology
Luz A Puentes Jácome, Elizabeth A Edwards
Chlorobenzenes are soil and groundwater pollutants of concern which can be reductively dehalogenated by organohalide-respiring bacteria from the genera Dehalococcoides and Dehalobacter. The bioaugmentation culture KB-1 harbours Dehalococcoides mccartyi spp. that reductively dehalogenate trichloroethene to ethene. It contains more than 30 reductive dehalogenase genes; some of them are highly similar to genes found in the chlorobenzene-respiring Dehalococcoides mccartyi strain CBDB1. We explored the chlorobenzene dehalogenation capability of the KB-1 enrichment culture using 1,2,4-trichlorobenzene (1,2,4-TCB)...
October 27, 2017: FEMS Microbiology Ecology
Márton Szoboszlay, Anja B Dohrmann, Christopher Poeplau, Axel Don, Christoph C Tebbe
Land use and their change have dramatic consequences for above-ground biodiversity, but their impact on soil microbial communities is poorly understood. In this study, soils from 19 European sites representing conversion of croplands to grasslands or forests and of grasslands to croplands or forests were characterized for microbial abundance and bacterial diversity. The abundance of Bacteria and Fungi but not Archaea responded to land use change. Site was the major determinant of the soil bacterial community structure, explaining 32% of the variation in 16S rRNA gene diversity...
October 26, 2017: FEMS Microbiology Ecology
Khald Blau, Laia Casadevall, Birgit Wolters, Tina Van den Meersche, Robert Kreuzig, Kornelia Smalla, Sven Jechalke
Veterinary antibiotics, bacteria carrying antibiotic resistance determinants located on mobile genetic elements and nutrients are spread on agricultural soil using manure as fertilizer. However, systematic quantitative studies linking antibiotic concentrations and antimicrobial resistance genes (ARGs) in manure and the environment are scarce but needed to assess environmental risks.In this microcosm study, a sandy and a loamy soil were mixed with manure spiked with streptomycin or doxycycline at five concentrations...
October 26, 2017: FEMS Microbiology Ecology
Faseela Hamza, Surekha Satpute, Arun Banpurkar, Ameeta Ravi Kumar, Smita Zinjarde
Bacterial infections are major constraints in aquaculture farming. These pathogens often adapt to the biofilm mode of growth and resist antibiotic treatments. We have used a non-toxic glycolipid biosurfactant (BS-SLSZ2) derived from a marine epizootic bacterium Staphylococcus lentus to treat aquaculture associated infections in an eco-friendly manner. We found that BS-SLSZ2 contained threose, a four carbon sugar as the glycone component, and hexadecanoic and octadecanoic acids as the aglycone components. The critical micelle concentration (CMC) of the purified glycolipid was 18 mg mL-1...
October 26, 2017: FEMS Microbiology Ecology
Kirsten Grond, Richard B Lanctot, Ari Jumpponen, Brett K Sandercock
Gut microbiota play a key role in host health. Mammals acquire gut microbiota during birth, but timing of gut microbial recruitment in birds is unknown. We evaluated whether precocial chicks from three species of arctic-breeding shorebirds acquire gut microbiota before or after hatching, and then documented the rate and compositional dynamics of accumulation of gut microbiota. Contrary to earlier reports of microbial recruitment before hatching in chickens, quantitative PCR and Illumina sequence data indicated negligible microbiota in the guts of shorebird embryos before hatching...
October 24, 2017: FEMS Microbiology Ecology
Heiko Nacke, Ingo Schöning, Malte Schindler, Marion Schrumpf, Rolf Daniel, Graeme W Nicol, James I Prosser
Coastal areas worldwide are challenged by climate change-associated increases in sea level and storm surge quantities that potentially lead to more frequent flooding of soil ecosystems. Currently, little is known of the effects of inundation events on microorganisms controlling nitrification in these ecosystems. The goal of this study was to investigate the impact of seawater flooding on the abundance, community composition and salinity tolerance of soil ammonia oxidisers. Topsoil was sampled from three islands flooded at different frequencies by the Wadden Sea...
October 24, 2017: FEMS Microbiology Ecology
Tina Keller-Costa, Dominic Eriksson, Jorge M S Gonçalves, Newton C M Gomes, Asunción Lago-Lestón, Rodrigo Costa
Microbial communities inhabiting gorgonian corals are believed to benefit their hosts through nutrient provision and chemical defence; yet much remains to be learned about their phylogenetic uniqueness and cultivability. Here, we determined the prokaryotic community structure and distinctiveness in the gorgonian Eunicella labiata by Illumina sequencing of 16S rRNA genes from gorgonian and seawater metagenomic DNA. Furthermore, we used a 'plate wash' methodology to compare the phylogenetic diversity of the 'total' gorgonian bacteriome and its 'cultivatable' fraction...
October 24, 2017: FEMS Microbiology Ecology
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