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Compound eyes of the small white butterfly Pieris rapae have three distinct classes of red photoreceptors

Authors :
Adam J. Blake
Xudong Qiu
Primož Pirih
Kentaro Arikawa
Gerhard Gries
Source :
Journal of comparative physiology a-Neuroethology sensory neural and behavioral physiology, 205(4), 553-565. SPRINGER HEIDELBERG
Publication Year :
2019
Publisher :
Springer Science and Business Media LLC, 2019.

Abstract

The two subspecies of the small white butterfly, the European Pieris rapae rapae and the Asian P. r. crucivora, differ in wing colouration. Under ultraviolet light, the wings of both male and female P. r. rapae appear dark, whereas the wings of male P. r. crucivora are dark and those of females are bright. It has been hypothesized that these sexually dimorphic wing reflections in P. r. crucivora may have induced the evolution of a fluorescing-screening pigment in the violet-opsin-expressing photoreceptors of males, thus facilitating greater wavelength discrimination near 400nm. Comparing the compound eyes of the two subspecies using genetic, microscopical, spectrographic, and histological methods revealed no differences that would meaningfully affect photoreceptor sensitivity, suggesting that the fluorescing-screening pigment did not evolve in response to sexually dimorphic wing reflections. Our investigation further revealed that (i) the peri-rhabdomal reddish-screening pigments differ among the three ommatidial types; (ii) each of the ommatidial types exhibits a unique class of red photoreceptor with a distinct spectral peak; and (iii) the blue, green, and red photoreceptors of P. rapae exhibit a polarization sensitivity >2, with red photoreceptors allowing for a two-channel opponency form of polarization sensitivity.

Details

ISSN :
14321351 and 03407594
Volume :
205
Database :
OpenAIRE
Journal :
Journal of Comparative Physiology A
Accession number :
edsair.doi.dedup.....e5cbc720eda32fd94d68787f527fb569
Full Text :
https://doi.org/10.1007/s00359-019-01330-8