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dc.contributor.authorJordão, Joana M.
dc.contributor.authorCronin, Thomas W.
dc.contributor.authorOliveira, Rui F.
dc.date.accessioned2019-04-18T19:48:52Z
dc.date.available2019-04-18T19:48:52Z
dc.date.issued2007-01-17
dc.description.abstractFiddler crabs have compound eyes that are structurally fairly well understood. However, there has been much debate regarding their spectral sensitivity and capacity to enable colour discrimination. We examined the visual pigments of two North-American species (Uca pugnax and U. pugilator), one species from the Indo-West Pacific (U. vomeris) and the only Eastern-Atlantic species (U. tangeri) of fiddler crabs using in situ microspectrophotometry of frozen sections of dark-adapted eyes. Only one spectral class of visual receptor was found in the larger (R1–7) retinular cells of each species, with maximum absorption peaking between 508·nm and 530·nm (depending upon species). The R8 retinular cell, that might contain a shortwavelength sensitive photopigment and provide a basis for colour vision, was too small to analyze by these methods. Rhabdoms were lined with screening pigment which strongly influenced each species’ spectral sensitivity, sharpening the peak and shifting the maximum towards longer wavelengths, on occasion to as far as the 600·nm region. We hypothesize that sensitivity to longer wavelengths enhances contrast between background (blue sky or tall vegetation) and the male major claw during the waving display.en_US
dc.description.sponsorshipThis work is based on research supported by the National Science Foundation under Grant # IBN-0235820 (to T.W.C.) and Portuguese Foundation for Science and Technology’s (FCT) Pluriannual Program (R&D Unit 331/94). J.M.J. was supported by a fellowship from the FCT (BD/19835/99).en_US
dc.description.urihttp://jeb.biologists.org/content/210/3/447en_US
dc.format.extent7 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2w7c7-ht2b
dc.identifier.citationJoana M. Jordão, Thomas W. Cronin, Rui F. Oliveira, Spectral sensitivity of four species of fiddler crabs (Uca pugnax, Uca pugilator, Uca vomeris and Uca tangeri) measured by in situ microspectrophotometry, Journal of Experimental Biology 2007 210: 447-453; doi: 10.1242/jeb.02658en_US
dc.identifier.urihttps://doi.org/10.1242/jeb.02658
dc.identifier.urihttp://hdl.handle.net/11603/13464
dc.language.isoen_USen_US
dc.publisherThe Company of Biologists Ltden_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Biological Sciences Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsnon-commercial use only
dc.subjectfiddler craben_US
dc.subjectspectral sensitivityen_US
dc.subjectmicrospectrophotometryen_US
dc.titleSpectral sensitivity of four species of fiddler crabs (Uca pugnax, Uca pugilator, Uca vomeris and Uca tangeri) measured by in situ microspectrophotometryen_US
dc.typeTexten_US


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