Funding for this research was provided by:
Japan Society for the Promotion of Science (Studies on origin and maintenance of marine biodiversity and systematic conservation planning)
Text and Data Mining valid from 2017-11-18
Received: 15 September 2017
Revised: 3 November 2017
Accepted: 7 November 2017
First Online: 18 November 2017
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed by the authors.
: Permits and approval of field or observational studies were not needed according to laws in Japan/Okinawa.