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Classification is the process of organizing organisms into hierarchically inclusive groups based on their phenotypic similarities or evolutionary relationships. A species comprises one or more strains, and closely related species are grouped into genera. Genera are further classified into families, families into orders, orders into classes, and so forth, up to the domain level, which is the broadest taxonomic rank derived from a combination of phenotypic and genotypic data.The nomenclature of...
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Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
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Updated: Aug 11, 2025

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Comparative Analysis of Core Microbiome Assignments: Implications for Ecological Synthesis.

Gordon F Custer1,2,3,4, Maya Gans5, Linda T A van Diepen1,4

  • 1Department of Ecosystem Science and Management, University of Wyoming, Laramie, Wyoming, USA.

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Core microbiome identification methods yield inconsistent results. Occupancy-based approaches most accurately identify true core taxa, but accuracy depends on data distribution. Standardized methods are needed for ecological synthesis.

Keywords:
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Area of Science:

  • Microbiology and Ecology
  • Computational Biology

Background:

  • The core microbiome, defined by consistently present taxa, is crucial for understanding microbial communities.
  • Current methods for assigning core microbiome membership are diverse, leading to inconsistencies and ecological interpretation challenges.

Approach:

  • Reviewed and applied common core microbiome assignment methods to large datasets.
  • Utilized simulations to assess the accuracy of different methods.
  • Analyzed the influence of taxon abundance and occupancy distributions on assignment accuracy.

Key Points:

  • Core taxa assignments vary significantly depending on the method and data type used.
  • Occupancy-based methods demonstrated higher accuracy in identifying true core members.
  • Method performance is contingent on the underlying distribution of taxon abundance and occupancy.

Conclusions:

  • Inconsistent core microbiome assignments can impact downstream ecological interpretations.
  • Occupancy-based methods offer a more reliable approach for core microbiome identification.
  • Standardization of methods and data processing is essential for advancing ecological synthesis and reliable microbiome research.