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Investigating the core microbiome concept: Daphnia as a case study.

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Summary
This summary is machine-generated.

The Daphnia magna microbiome is highly variable, with few consistent taxa. Limnohabitans planktonicus is common in lab settings but not a core member in wild Daphnia populations.

Keywords:
DaphniaLimnohabitans planktonicusCore microbiome

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Area of Science:

  • Microbiology
  • Ecology
  • Freshwater Biology

Background:

  • Host-associated microbiomes are crucial for organism fitness and ecosystem function.
  • The cladoceran Daphnia is a key freshwater grazer, making its microbiome vital for ecosystem stability.
  • Understanding the Daphnia microbiome is essential for interpreting host-microbiota interactions and ecosystem dynamics.

Purpose of the Study:

  • To identify the core microbiome of Daphnia magna, focusing on consistently present microbial taxa.
  • To determine if a stable, core microbiome exists across different Daphnia populations and environments.
  • To assess the influence of laboratory versus field conditions on Daphnia microbiome composition.

Main Methods:

  • Compiled a dataset from 12 published studies on Daphnia magna microbiomes.
  • Analyzed gut and whole-body samples from laboratory-cultured and field-grown Daphnia.
  • Employed quantification metrics based on prevalence and relative abundance to identify core taxa.

Main Results:

  • The Daphnia magna microbiome exhibits high variability across studies and conditions.
  • Limnohabitans planktonicus showed consistent association, particularly in laboratory-cultured Daphnia.
  • Field-grown Daphnia displayed more diverse microbiomes with a reduced presence of L. planktonicus, challenging its core status.

Conclusions:

  • The Daphnia magna microbiome is characterized by variability and limited conserved associations.
  • L. planktonicus is a stable taxon in laboratory settings but not a core member in natural environments.
  • Laboratory findings on Daphnia microbiomes require cautious interpretation for natural populations; further field research is needed.