Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8871124 | Marine Pollution Bulletin | 2018 | 6 Pages |
Abstract
The colours of the hermatypic corals Porites sp. and Acropora cytherea at Sesoko Island, Okinawa, Japan, were photographed continuously, from 19 July to 6 September 2016, by an underwater camera equipped with a lens wiper. The average seawater temperature during the study period was 29.9â¯Â°C. The daily average seawater temperature (DAST) was >30.0â¯Â°C until 23 August 2016, and a maximum value of 31.2â¯Â°C was recorded on 2 August 2016. Red, green, and blue (RGB) values of these corals were analysed based on photographs taken at 14:00. The RGB values of Porites sp. were stable throughout the observation period, while those of A. cytherea gradually increased (i.e. moved toward the “white” end of the spectrum) until the beginning of September. The present study demonstrated the usefulness of RGB analysis of photographs taken by an underwater camera equipped with a lens wiper for monitoring coral beaching.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Oceanography
Authors
Shingo Nishiguchi, Naohisa Wada, Hideyuki Yamashiro, Hiroshi Ishibashi, Ichiro Takeuchi,