Structural origin of sexual dichromatic coloration and luster in the beetle Goliathus cacicus  

作　　者：JIANG LiPing DONG BiQin LIU XiaoHan LIU Feng ZI Jian 

机构地区：[1]Department of Physics,Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education),and State Key Laboratory of Surface Physics,Fudan University,Shanghai 200433,China [2]Department of Physics,Shanghai Normal University,Shanghai 200234,China

出　　处：《Chinese Science Bulletin》2012年第24期3211-3217,共7页

基　　金：supported by the National Basic Research Program of China (2011CB922004);supported by the National Natural Science Foundation of China;the Shanghai Science and Technology Commission

摘　　要：In the beetle Goliathus cacicus, male elytra show silky luster with iridescence while female ones appear lusterless white without iridescence to our perception. We revealed by structural characterizations and optical measurements that elytral coloration and luster of both male and female beetles stem from the tubular scales on the elytra, whose interior is filled with a random structure. Distinct differences between male and female scales reside in the cortex thickness and the filling fraction of the random structure, which are important factors in the determination of the sexual dichromatic luster and iridescence. In additional to reflection peaks in the visible range, spectral measurements indicate that both male and female elytra display also strong iridescent ultraviolet (UV) reflections. Scattering spectra show that both male and female elytra display UV luster, although it is absent for female ones in the visible range.In the beetle Goliathus cacicus, male elytra show silky luster with iridescence while female ones appear lusterless white without iridescence to our perception. We revealed by structural characterizations and optical measurements that elytral coloration and luster of both male and female beetles stem from the tubular scales on the elytra, whose interior is filled with a random structure. Distinct differences between male and female scales reside in the cortex thickness and the filling fraction of the random structure, which are important factors in the determination of the sexual dichromatic luster and iridescence. In additional to reflection peaks in the visible range, spectral measurements indicate that both male and female elytra display also strong iridescent ultraviolet （UV） reflections. Scattering spectra show that both male and female elytra display UV luster, although it is absent for female ones in the visible range.

关 键 词：随机结构 光泽 甲虫 色彩 起源 光学测量 无规结构 光谱测量 

分 类 号：Q964[生物学—昆虫学]