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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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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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Taxonomic variability and functional stability across Oregon coastal subsurface microbiomes.

Hengameh H Soufi1,2, Robert Porch1,2, Masha V Korchagina1,2

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Microbial communities in marine sediments show stable functions but variable species. Biological interactions, not local conditions, drive this taxonomic diversity.

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Area of Science:

  • Marine microbiology
  • Geomicrobiology
  • Community ecology

Background:

  • Factors shaping marine subsurface sediment microbial communities are poorly understood.
  • Subsurface sediments represent a vast, under-explored microbial habitat.

Purpose of the Study:

  • To investigate the drivers of microbial community structure in marine subsurface sediments.
  • To differentiate between functional and taxonomic community responses to environmental factors.

Main Methods:

  • Metagenomics for functional gene structure analysis.
  • 16S rRNA gene amplicon sequencing for taxonomic composition.
  • Physicochemical measurements and statistical modeling (Mantel tests, regression, permutation null models).

Main Results:

  • Functional community structure was stable across a wide geographic area (>300 km).
  • Taxonomic composition varied significantly at the amplicon sequence variant (ASV) and operational taxonomic unit (OTU) levels.
  • Geographic distance and physicochemical variables poorly explained taxonomic variability.
  • Community assembly analysis indicated strong taxa segregation (exclusion).

Conclusions:

  • Biological interactions, rather than environmental factors, are key drivers of taxonomic variation in marine subsurface sediments.
  • Taxonomic variation can be decoupled from functional community structure.