Dirivultidae (Copepoda: Siphonostomatoida) from hydrothermal vent fields in the Okinawa Trough, North Pacific Ocean, with description of one new species

Uyeno, Daisuke; Kakui, Keiichi; Watanabe, Hiromi; Fujiwara, Yoshihiro

doi:10.1017/s0025315420001101

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…Seawater samples were collected during R/V Mirai cruise MR17-03C in 2017 [Brisbin et al, 2020] above two active deepsea hydrothermal vent sites (Figure 1), including Hatoma Knoll site (depth: 1531 m) [Toki et al 2016] and Daisan-Kume 85 Knoll ANA site (depth: 1079 m) [Makabe et al, 2016;Uyeno et al, 2020]. Hatoma Knoll is characterized by vigorous venting of fluids ≦323 oC with boiling-derived bubbles.…”

Section: Samplingmentioning

confidence: 99%

Hydrogen and carbon isotope fractionation factors of aerobic methane oxidation in deep-sea water

Kawagucci¹,

Matsui²,

Makabe³

et al. 2021

Preprint

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Abstract. Isotope fractionation factors associated with various biogeochemical processes are important in ensuring the practicality of isotope tracers in biogeosciences at large. Methane is a key component of the subsurface biosphere and a notable greenhouse gas, making the accurate evaluation of methane cycles, including microbial methanotrophy, imperative. Although the isotope fractionation factors associated with methanotrophy been examined under various conditions, the dual-isotope fractionation factors of aerobic methanotrophy in oxic seawater column remain unclear. Here, we investigated hydrogen and carbon isotope ratios of methane as well as the relevant biogeochemical parameters and microbial community compositions in hydrothermal plumes in the Okinawa Trough. Methanotrophs were found to be abundant in plumes above the Hatoma Knoll vent site, and we succeeded in simultaneously determining hydrogen and carbon isotope fractionation factors associated with aerobic oxidation of methane (εH = 49.4 ± 5.0 ‰, εC = 5.2 ± 0.4 ‰) – the former being the first of its kind ever reported. This εH value is comparable with reported values from terrestrial ecosystems but clearly lower than those from aerobic and anaerobic methanotroph enrichment cultures, as well as incubations of methanotrophic isolates. The covariation factor between δ13CCH4 and δDCH4, Λ (9.4/8.8 determined using two different methods), was consistent with those from methanotrophic isolate incubations. These values determined herein are valuable for understanding dynamics of methane cycling in the marine realm, and future applications of the approach used herein to other habitats with methanotrophic activity will help reveal whether the small εH value observed herein is a ubiquitous feature across all marine systems.

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Section: Samplingmentioning

confidence: 99%

Hydrogen and carbon isotope fractionation factors of aerobic methane oxidation in deep-sea water

Kawagucci¹,

Matsui²,

Makabe³

et al. 2021

Preprint

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“…The immense biodiversity of the ocean is to be celebrated and is typified in the cover image of this issue and within this issue there are several papers addressing aspects of understanding biodiversity. Uyeno et al (2021) document copepods from a hydrothermal vent field including one new species they found; Díaz et al (2021) describe lesser known sponges from the Mediterranean. Understanding of marine systems is fundamental to their management and in this issue Holmes and Callaway (2021) describe survey techniques targeted at describing fouling communities and identifying non-native species within active ports.…”

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confidence: 99%