Journal Article

Microscopic and submicroscopic gradient variation of olfactory systems among six Sinocyclocheilus species living in different environments

Zhang, X.-Y., Huang, Z.-Q., Ning, T., Xiang, X.H. Li, C.-Q. Chen, S.-Y. and Xiao, H.

Record Number:
4157
Year:
2018
Journal:
Zoological Science
Pages:
411-420
Volume:
35
Abstract:
The fish genus Sinocyclocheilus contains many different species that inhabit diverse natural environments, such as surface water layer, cave, or intermediate. As a result of these different habitats there are some differences in their sensory systems. Microscopic and submicroscopic structures of olfactory systems in six representative species of Sinocyclocheilus were studied, including one surface-dwelling species (S. grahami), two intermediate species (S. jii and S. macrophthalmus) and three cave-dwelling species (S. brevibarbatus, S. anshuiensis, and S. tianlinensis). Due to adaptive evolution under extreme environmental conditions, cave-dwelling species have more developed olfactory systems. We observed that, compared with surface-dwelling species, the olfactory sac of the cave-dwelling Sinocyclocheilus species has the following characteristics: higher density of cilia, greater length of sensory cilia, many other special structures (micro-ridge, olfactory islet, rod cilia). These results reveal different levels of olfactory system development, consistent with the view that that cave-dwelling species have more developed olfactory systems than intermediate and surface-dwelling species. Key words: Sinocyclocheilus, diverse habitat, olfactory systems, submicroscopic structures, scanning electron micrograph (SEM)
Times Cited:
3
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