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Spectral sensitivity of the compound eyes in the purple land crab gecarcinus lateralis freminville



Spectral sensitivity of the compound eyes in the purple land crab gecarcinus lateralis freminville



Biological Bulletin (Woods Hole) 173(2): 398-406



The spectral sensitivities (S(.lambda.)) of dark-adapted compound eyes of the purple land crab Gecarcinus lateralis possess a broad maximum in the blue-green, 420-530 nm, when measured by electroretinographic (ERG) techniques. Selective adaptation experiments showed large changes in sensitivity but did not isolate different receptor types. A photopigment with maximal absorption at 487 nm was identified in the rhabdoms by microspectrophotometry. Besides the presence of a dominant green receptor system, the existence of a hump in the short wavelength region in S(.lambda.) suggests the presence of a blue-sensitive system as well. It is hypothesized that two photopigments (P487 and P440) in conjunction with screening pigment(s) mediate broad visual maximum in the blue-green in the purple land crab.

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Accession: 006459896

Download citation: RISBibTeXText

DOI: 10.2307/1541552



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