Theme Session

Call for Theme Session proposals

JCRS20 organizing committee is inviting “Theme Session” proposals for deeply discussing specific research topics or interdisciplinary issues. Each session organizer can invite up to two invitation speakers, who are not necessary to be JCRS members and nor to pay registration fee.
The Theme Sessions are planning to be held in parallel with the regular sessions for increasing the possible number of the oral presentations. In addition to the invited speakers, a usual presenter can select the regular session or a suitable Theme Session for his/her presentation. Time slot for your presentation in a session will be adjusted based on the number of entries. The Theme Session organizers will be requested to arrange the program of their sessions after the close of the abstract submission.


Proposals for Theme Sessions must be submitted by Aug. 21 (Mon), 17:00 (JST). Please submit your proposal via e-mail ( with title of “JCRS Theme Session” and information of Name(s) of Organizer(s), Affiliation(s), Session title, and Session summary (less than 150 words).

If you have some questions, please do not hesitate to contact JCRS20 Organizing Committee (

Outline of Theme Sessions

-English Session-

In this session, presentation language including Q&A is basically in English. This session is as same as ‘Regular session’, wider presentation topics related to coral reef studies are accepted. But of course, you can join regular or other sessions with presentation by English.



Naoko Isomura(National Institute of Technology, Okinawa College)

Title and abstract are provided only in Japanese. Please see Japanese site




Title and abstract are provided only in Japanese. Please see Japanese site


-Possible causal factors of the Crown-of-Thorns Seastar Outbreaks in Okinawa-

Ken Okaji (Coral Quest Inc.)

The repeated and chronic outbreaks of the Crown-of-Thorns Seastar (COTS) have been the major threat to coral reefs in Okinawa since the early 1970s. A possible cause that has been widely accepted in the GBR is the increased biomass of phytoplankton due to terrestrial nutrient runoff, i.e. the larval starvation hypothesis. Is the same hypothesis applicable to the case of COTS outbreaks in Okinawa? To address this question, new insights into the causal factors of COTS outbreaks will be discussed in this session.