Journal Article
Variable eyes degeneration of the cave carp Sinocyclocheilus bicornutus (Cyprinidae) from Guizhou Province, southwest China
Wen, H., Wang, Y., Yang, X., Yan, S., Luo, T., He, Y. and Zhou, J.
Record Number:
6013
Year:
2023
Journal:
Journal of Ichthyology
Pages:
41-47
Volume:
63
Abstract:
Sinocyclocheilus bicornutus is a valid cave–dwelling cyprinid species with small eyes from Guizhou
province, southwest China, the close relatives of which are also small eyed and obligate cave–dwelling. Our
expeditions in 2015 to 2017 found the intraspecific variability of eye degeneration based on total 114 specimens
collected from one lighted and two dark caves with an altitude of about 1350 m. Three morphotypes, the small
eyed, the rudimentary eyed, and the eyeless, co-occurred in each cave. The eye size closely correlates with the
standard length SL in the lighted cave, while the correlation of the eye size and SL become loosely related in
the dark caves which associated with increased proportion of significantly degenerative eyed morphotypes. It
implies that the developmental retardation occurs in the darkness and remains in adult stage. The variable
eye-reduced populations of S. bicornutus provide an interesting model to address the involvement of potential
epigenetic mechanisms with the regressive evolution of cavefish.
Keywords: cavefish, regressive evolution, phenotypic variation, epigenetics
Times Cited:
1
Relevent Species:
Related Records:
Wang, D.H. and Liao, J.W. (1997)
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