Spatial variation of quantitative color traits in green and black types of sea cucumber <Emphasis Type="Italic">Apostichopus japonicus</Emphasis> (Stichopodidae) using image processing |
| |
Authors: | Katsumasa Yamada Masakazu Hori Susumu Matsuno Tatsuo Hamano Masami Hamaguchi |
| |
Institution: | (1) National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, 2-17-5 Maruishi, Hatsukaichi Hiroshima, 739-0452, Japan;(2) Inland Sea Research Division, Yamaguchi Prefectural Fisheries Research Center, Aiofutajima, Yamaguchi 754-0893, Japan;(3) Department of Applied Aquabiology, National Fisheries University, 2-7-1 Nagata-Honmachi, Shimonoseki, Yamaguchi 759-6595, Japan |
| |
Abstract: | It has been suggested that the Japanese sea cucumber, Apostichopus japonicus, has three color types (red, green, and black), although the qualitative difference between the color types, particularly
between the green and black types, is unclear because of continuous color variation among color types. This study elucidated
the color variation between green and black types using image processing (RGB, red–green–blue system) and multivariate analysis to demonstrate whether or not the black and green types can be quantitatively classified.
Moreover, spatial variation of the RGB value among various local sites was clarified to estimate potential environmental factors
that may affect the color variation. The series of analyses revealed that a quantitative boundary between green and black
types could be provisionally established, and also that spatial variability in the intermediate (continuous) color trait between
green and black types was significant. Potential environmental factors (depth and industrial activity index) were correlated
with the color traits in both color types. These results suggest that the green and black types cannot be regarded as independent
color traits and that the color variation between green and black types may be influenced by local environmental factors. |
| |
Keywords: | Apostichopus japonicus Color variation Discriminant analysis RGB Sea cucumber |
本文献已被 SpringerLink 等数据库收录! |
|