Ecological and Evolutionary Science
Research Article | Ecological and Evolutionary ScienceIndirect Interspecies Regulation: Transcriptional and Physiological Responses of a Cyanobacterium to Heterotrophic PartnershipThis study elucidates how a cyanobacterial primary producer acclimates to heterotrophic partnership by modulating the expression levels of key metabolic genes. Heterotrophic bacteria can indirectly regulate the physiology of the photoautotrophic primary producers, resulting in physiological changes identified here, such as increased intracellular ROS. Some of the interactions inferred from this model system represent putative principles...
Editor's Pick Research Article | Ecological and Evolutionary ScienceComparative Genome Analyses of Vibrio anguillarum Strains Reveal a Link with Pathogenicity TraitsComparative genome analysis of strains of a pathogenic bacterial species can be a powerful tool to discover acquisition of mobile genetic elements related to virulence. Here, we compared 28 V. anguillarum strains that differed in virulence in fish larval models. By pan-genome analyses, we found that six of nine highly virulent strains had a unique core and accessory genome. In contrast, V. anguillarum strains that were...
Research Article | Ecological and Evolutionary ScienceCommunity-Level Differences in the Microbiome of Healthy Wild Mallards and Those Infected by Influenza A VirusesSeasonal influenza causes 3 to 5 million severe illnesses and 250,000 to 500,000 human deaths each year. While pandemic influenza viruses emerge only periodically, they can be devastating—for example, the 1918 H1N1 pandemic virus killed more than 20 million people. IAVs infect the respiratory tract and cause significant morbidity and mortality in humans. In contrast, IAVs infect the gastrointestinal tract of waterfowl, producing little...
Opinion/Hypothesis | Ecological and Evolutionary ScienceUncovering the Horseshoe Effect in Microbial AnalysesThe horseshoe effect is often considered an artifact of dimensionality reduction. We show that this is not true in the case for microbiome data and that, in fact, horseshoes can help analysts discover microbial niches across environments.
Research Article | Ecological and Evolutionary ScienceDistinct Biogeographic Patterns for Archaea, Bacteria, and Fungi along the Vegetation Gradient at the Continental Scale in Eastern ChinaUnderstanding biogeographic patterns is a precursor to improving our knowledge of the function of microbiomes and to predicting ecosystem responses to environmental change. Using natural forest soil samples from 110 locations, this study is one of the largest attempts to comprehensively understand the different patterns of soil archaeal, bacterial, and fungal biogeography at the continental scale in eastern China. These patterns in...
Research Article | Ecological and Evolutionary ScienceBalance Trees Reveal Microbial Niche DifferentiationBy explicitly accounting for the compositional nature of 16S rRNA gene data through the concept of balances, balance trees yield novel biological insights into niche differentiation. The software to perform this analysis is available under an open-source license and can be obtained at https://github.com/biocore/gneiss.
Editor's Pick Research Article | Ecological and Evolutionary ScienceDirect Heme Uptake by Phytoplankton-Associated Roseobacter BacteriaEcosystem productivity in large regions of the surface ocean is fueled by iron that has been microbially regenerated from biomass. Currently, the specific microbes and molecules that mediate the transfer of recycled iron between microbial trophic levels remain largely unknown. We characterized a marine bacterial heme transporter and verified its role in acquiring heme, an abundant iron-containing enzyme cofactor. We present evidence...
Research Article | Ecological and Evolutionary ScienceSSUnique: Detecting Sequence Novelty in Microbiome SurveysExtensive SSU rRNA gene sequence libraries, constructed from DNA extracts of environmental or host-associated samples, often contain many unclassified sequences, many representing organisms with novel taxonomy (taxonomic “blind spots”) and potentially unique ecology. This novelty is poorly explored in standard workflows, which narrows the breadth and discovery potential of such studies. Here we present the SSUnique analysis pipeline,...
Research Article | Ecological and Evolutionary ScienceAdaptive Evolution of Phosphorus Metabolism in ProchlorococcusMicrobes are known to employ three basic strategies to compete for limiting elemental resources: (i) cell quotas may be adjusted by alterations to cell physiology or by substitution of a more plentiful resource, (ii) stressed cells may synthesize high-affinity transporters, and (iii) cells may access more costly sources from internal stores, by degradation, or by petitioning other microbes. In the case of phosphorus, a limiting resource...
Editor's Pick Research Article | Ecological and Evolutionary ScienceMicrobial Communities Are Well Adapted to Disturbances in Energy InputWithin the broader ecological context, biological communities are often viewed as stable and as only experiencing succession or replacement when subject to external perturbations, such as changes in food availability or the introduction of exotic species. Our findings indicate that microbial communities can exhibit strong internal dynamics that may be more important in shaping community succession than external drivers. Dynamic “...