[B-CG04] Earth and Planetary Science Frontiers for Life and Global Environment

[BCG04-02] Niche separation of nitrifiers from the sea surface to the hadal ocean

★招待講演

*布浦 拓郎¹ (1.独立行政法人海洋研究開発機構海洋生命理工学研究開発センター、2.独立行政法人海洋研究開発機構深海・地殻内生物圏研究分野)

キーワード：nitrification, ocean, nitrogen cycle

Ammonium (ammonia) and nitrite are important intermediates of oceanic nitrogen cycle, but these are depleted in most of the oceanic waters. In contrast, availability of ammonia most likely influence on niche separation of nitrifiers, and thus the niche separation would be a signature of geochemical interface in oceanic environments. In fact, niche separation of nitrifiers has been observed in Arctic to tropical oceans, and sea surface to hadal ocean (Sintes et al. 2013, Nunoura et al. 2015 and references therein). In this study, we analyzed single amplified genomes (SAGs) to know genomic backgrounds of niche separation of ammonia-oxidizing thaumarchaeotes from sea surface to hadal oceans.