Population history of deep-sea vent and seep Provanna snails (Mollusca: Abyssochrysoidea) in the northwestern Pacific

Tomomi Ogura; Hiromi Kayama Watanabe; Chong Chen; Takenori Sasaki; Shigeaki Kojima; Jun-Ichiro Ishibashi; Katsunori Fujikura

doi:10.7717/peerj.5673

Population history of deep-sea vent and seep Provanna snails (Mollusca: Abyssochrysoidea) in the northwestern Pacific

PeerJ. 2018 Sep 26:6:e5673. doi: 10.7717/peerj.5673. eCollection 2018.

Authors

Tomomi Ogura^{1

2}, Hiromi Kayama Watanabe², Chong Chen², Takenori Sasaki³, Shigeaki Kojima⁴, Jun-Ichiro Ishibashi⁵, Katsunori Fujikura^{1

2}

Affiliations

¹ Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, Tokyo, Japan.
² Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan.
³ The University Museum, The University of Tokyo, Tokyo, Japan.
⁴ Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan.
⁵ Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Fukuoka, Japan.

Abstract

Background: Gastropods of the genus Provanna are abundant and widely distributed in deep-sea chemosynthetic environments with seven extant species described in the northwestern Pacific.

Methods: We investigated the population history and connectivity of five Provanna species in the northwestern Pacific through population genetic analyses using partial sequences of the cytochrome c oxidase subunit I gene.

Results: We found that P. subglabra, the most abundant and genetically diverse species, is genetically segregated by depth. Among the five species, the three comparatively shallower species (P. lucida, P. kuroshimensis, P. glabra) had a more constant demographic history compared to the deeper species (P. subglabra, P. clathrata).

Discussion: Environmental differences, especially depth, appears to have a role in the segregation of Provanna snails. The population of P. clathrata in the Irabu Knoll appears to have expanded after P. subglabra population. The remaining three species, P. lucida, P. kuroshimensis, and P. glabra, are only known from a single site each, all of which were shallower than 1,000 m. These data indicate that Provanna gastropods are vertically segregated, and that their population characteristics likely depend on hydrothermal activities.

Keywords: Chemosynthetic community; DNA barcoding; Okinawa Trough; Population expansion.

Grants and funding

This study was supported by the Trans-crustal Advection and In situ reaction of Global sub-seafloor Aquifer (TAIGA) project of the Ministry of Education, Culture, Sports, Science and Technology, a Grant-in-Aid for Scientific Research B (23370040) from the Japan Society for the Promotion of Science, and the Environment Research & Technology Development Fund (S-9-5-6) of the Ministry of the Environment, Japan. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.