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Elevated Seawater Temperatures Decrease Microbial Diversity in the Gut of Mytilus coruscus.

Yi-Feng Li1,2,3, Na Yang1,2, Xiao Liang1,2,3

  • 1International Research Center for Marine Biosciences, Ministry of Science and Technology, Shanghai Ocean University, Shanghai, China.

Frontiers in Physiology
|July 26, 2018
PubMed
Summary
This summary is machine-generated.

Elevated seawater temperatures significantly reduce gut microbial diversity in mussels, promoting opportunistic bacteria and increasing disease susceptibility. Diet had minimal impact on live mussels but altered microbial communities in those that died.

Keywords:
16S rRNAIllumina MiSeq sequencingMytilus coruscuselevated seawater temperaturegut microbiome

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Area of Science:

  • Marine biology
  • Microbiology
  • Ecotoxicology

Background:

  • Gut microbial communities are crucial for host immunity.
  • Marine invertebrate gut microbiota, especially under changing environmental conditions, are understudied.
  • Mytilus coruscus is a commercially important marine invertebrate.

Purpose of the Study:

  • To investigate the effects of elevated seawater temperature and microalgal diet on the gut microbial community of Mytilus coruscus.
  • To understand the interaction between environmental stressors and host-microbe dynamics in marine invertebrates.

Main Methods:

  • 16S rRNA gene sequencing was used to analyze the gut microbial community structure.
  • Mussels were exposed to elevated temperatures (31°C) and specific diets (Isochrysis zhanjiangensis, Platymonas helgolandica).
  • Mortality rates and gut microbial diversity were assessed.

Main Results:

  • High temperatures (31°C) led to increased mussel mortality and significantly reduced gut bacterial diversity.
  • Opportunistic bacteria, such as Bacteroides and Arcobacter, proliferated under high temperatures.
  • Microalgal diet did not significantly impact the gut microbial community of live mussels but affected those that died.

Conclusions:

  • Elevated seawater temperatures can disrupt the gut microbiome of Mytilus coruscus, potentially increasing disease risk.
  • The findings highlight the vulnerability of marine invertebrate gut microbiota to climate change.
  • Understanding these interactions is vital for predicting the impact of rising sea temperatures on marine ecosystems.