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Stochastic and Deterministic Assembly Processes in Seamount Microbial Communities.

Haizhou Li1,2, Huaiyang Zhou2, Shanshan Yang3,4

  • 1East China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Shanghai, China.

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|July 5, 2023
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Summary
This summary is machine-generated.

Seamounts act as deep-sea oases, hosting unique microbial communities distinct from surrounding areas. Habitat diversity and ocean currents shape these microbial ecosystems, with assembly shifting from random to selective processes with depth.

Keywords:
South China Seaneutral theoryniche theoryseamount

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Area of Science:

  • Marine microbial ecology
  • Deep-sea ecosystems
  • Biogeography

Background:

  • Seamounts are widespread but understudied deep-sea habitats.
  • Understanding microbial community assembly on seamounts is crucial for deep-sea ecology.

Purpose of the Study:

  • To investigate how seamount habitat features influence local microbial communities.
  • To analyze microbial populations in sediment cores from South China Sea seamounts.
  • To understand the factors shaping microbial biogeography and community assembly on seamounts.

Main Methods:

  • Analysis of microbial populations in sediment cores from 10 seamount summits.
  • Sampling at depths from 0.1 to 35 cm in the South China Sea.
  • Utilizing dormant thermospores as tracers for dispersal studies.
  • Employing a null mode analysis to understand community assembly.

Main Results:

  • Seamounts harbor distinct microbial communities with higher abundance, richness, and diversity compared to nonseamount areas.
  • Habitat heterogeneity and dispersal limitation by ocean currents shape seamount microbial biogeography.
  • Community assembly shifts from stochastic processes in surface sediments to deterministic selection in subsurface sediments due to resource depletion.

Conclusions:

  • Seamounts function as isolated, resource-rich oases supporting unique microbial life.
  • Both environmental selection and dispersal limitation are key drivers of seamount microbial biogeography.
  • A transition from stochastic to deterministic processes governs microbial community assembly from surface to subsurface sediments on seamounts.