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Titolo:
Tuning of photoreceptor spectral sensitivity in fireflies (Coleoptera : Lampyridae)
Autore:
Cronin, TW; Jarvilehto, M; Weckstrom, M; Lall, AB;
Indirizzi:
Univ Maryland Baltimore Cty, Dept Biol Sci, Baltimore, MD 21250 USA Univ Maryland Baltimore Cty Baltimore MD USA 21250 altimore, MD 21250 USA Univ Oulu, Dept Biol, FIN-90570 Oulu, Finland Univ Oulu Oulu Finland FIN-90570 ulu, Dept Biol, FIN-90570 Oulu, Finland Univ Oulu, Dept Phys Sci, SF-90220 Oulu, Finland Univ Oulu Oulu Finland SF-90220 u, Dept Phys Sci, SF-90220 Oulu, Finland Univ Oulu, Dept Physiol, SF-90220 Oulu, Finland Univ Oulu Oulu Finland SF-90220 lu, Dept Physiol, SF-90220 Oulu, Finland Howard Univ, Dept Biol, Washington, DC 20059 USA Howard Univ Washington DC USA 20059 , Dept Biol, Washington, DC 20059 USA
Titolo Testata:
JOURNAL OF COMPARATIVE PHYSIOLOGY A-SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
fascicolo: 1, volume: 186, anno: 2000,
pagine: 1 - 12
SICI:
0340-7594(200001)186:1<1:TOPSSI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOWFLY PHOTORECEPTORS; OPTIMIZATION MODEL; VISUAL PIGMENTS; COLOR-VISION; EVOLUTION; LIGHT; BIOLUMINESCENCE; CHANNELS; SYSTEMS;
Keywords:
spectral sensitivity; filter; firefly; compound eye; vision ecology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Cronin, TW Univ Maryland Baltimore Cty, Dept Biol Sci, Baltimore, MD 21250USA Univ Maryland Baltimore Cty Baltimore MD USA 21250 D 21250 USA
Citazione:
T.W. Cronin et al., "Tuning of photoreceptor spectral sensitivity in fireflies (Coleoptera : Lampyridae)", J COMP PH A, 186(1), 2000, pp. 1-12

Abstract

Sexual communication between male and female fireflies involves the visualdetection of species-specific bioluminescent signals. Firefly species varyspectrally in both their emitted light and in the sensitivity of the eye, depending on the time when each is active. Tuning of spectral sensitivity in three firefly species that occupy different photic niches was investigated using light and electron microscopy, microspectrophotometry, and intracellular recording to characterize the location and spectral absorption of thescreening pigments that filter incoming light, the visual pigments that receive this filtered light, and the visual spectral sensitivity. Twilight-active species had similar pink screening pigments, but the visual pigment ofPhotinus pyralis peaked near 545 nm, while that of P. scintillans had a lambda(max) near 557 nm. The night-active Photuris versicolor had a yellow screening pigment that was uniquely localized, while its visual pigment was similar to that of P. pyralis. These results show that both screening and visual pigments vary among species. Modeling of spectral tuning indicates that the combination of screening and visual pigments found in the retina of each species provides the best possible match of sensitivity to bioluminescent emission. This combination also produced model sensitivity spectra that closely resemble sensitivities measured either with electroretinographic orintracellular techniques. Vision in both species of Photinus appears to beevolutionarily tuned for maximum discrimination of conspecific signals from spectrally broader backgrounds. Ph. versicolor, on the other hand, appears to have a visual system that offers a compromise between maximum sensitivity to, and maximum discrimination of, their signals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 18:37:42