Premium
Salamander Blue‐sensitive Cones Lost During Metamorphosis †
Author(s) -
Chen Ying,
Znoiko Sergey,
DeGrip Willem J.,
Crouch Rosalie K.,
Ma Jianxing
Publication year - 2008
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2008.00310.x
Subject(s) - metamorphosis , salamander , tiger salamander , green light , rod , absorbance , adaptation (eye) , phase (matter) , aquatic ecosystem , blue light , biology , ecology , larva , optics , chemistry , physics , medicine , alternative medicine , organic chemistry , pathology , neuroscience
The tiger salamander lives in shallow water with bright light in the aquatic phase, and in dim tunnels or caves in the terrestrial phase. In the aquatic phase, there are five types of photoreceptors—two types of rods and three types of cones. Our previous studies showed that the green rods and blue‐sensitive cones contain the same visual pigment and have the same absorbance spectra; however, the green rods have a larger photon‐catch area and thus have higher light sensitivity than the blue‐sensitive cones. Here we show that after metamorphosis, the terrestrial salamander looses the blue‐sensitive cones, while the density of the green rods increases. Moreover, the size of the green rod outer segments is increased in the terrestrial phase, compared to that in the aquatic phase. This switch from the blue‐sensitive cones to the green rods may represent an adaptation to the dim light environment of the terrestrial phase.