Vertical distribution of particle-associated and free-living ammonia-oxidizing archaea in Suruga Bay, a deep coastal embayment of Japan
2019
We analyzed the vertical distributions of ammonia-oxidizing
archaea(AOA) in terms of abundance in Suruga Bay, Japan. We distinguished particle-associated (PA) from free-living (FL) assemblages. According to quantitative PCR measurements of the
ammonia monooxygenasesubunit A gene (amoA), most marine AOA were in an FL state. The vertical distributions of PA AOA
ecotypesdiffered from the general trend; the Shallow Marine clade was dominant in both the surface and deep layers. Thus, although PA AOA account for a small percentage of AOA abundance, they have a community structure distinct from that of FL AOA in planktonic environments. Marine particles should be investigated further as an unexplored niche of AOA in the ocean.
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