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Spectral mechanisms of the compound eye in the firefly photinus pyralis coleoptera lampyridae


, : Spectral mechanisms of the compound eye in the firefly photinus pyralis coleoptera lampyridae. Journal of Comparative Physiology A Sensory Neural & Behavioral Physiology 35(1): 21-28

Electroretinograms (ERG) were recorded from dark- and chromatic-adapted compound eyes in the dusk-active firefly, P. pyralis .male., at different wavelengths ranging from 320-700 nm and over 4.5 log units change in stimulus intensity. ERG waveforms differed in the short (near-UV and violet) and long (yellow) wavelengths. Wave form differences were quantitated by analysis of rise and fall times as a function of the amplitude of the response. Rise times were relatively constant for all stimulus wavelengths. Variations in the fall times were detected and followed characteristically different functions for short and long wavelengths. No significant differences in the slopes of the V-logI curves at different stimulus wavelengths were observed. Spectral sensitivity curves obtained from the ventral sector in dark- and chromatic-adapted conditions revealed peaks in the short (.lambda.max 400 nm, .lambda.max 430 nm, and .lambda.max 380 nm) and long (.lambda.max 570 nm) wavelengths, suggesting the presence of 2 spectral mechanisms. The long wavelength (yellow) mechanism was in close tune with the species bioluminescence emission spectrum.

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Related references

Strehler, B.L.; Press, G.D.; Raychaudhuri, A., 1967: Histochemistry of the lantern of the firefly Photinus pyralis (Coleoptera: lampyridae). Annals of the Entomological Society of America 60(1): 81-91

Goetz, MA.; Meinwald, J.; Eisner, T., 1981: Lucibufagins, 4. New defensive and a pterin from the firefly Photinus pyralis (Coleoptera: Lampyridae). Experientia (Basel): 377: 679-680

Strehler, B.L.; Press, G.D.; Raychaudhuri, A., 1967: Histo chemistry of the lantern of the firefly Photinus pyralis (Coleoptera: Lampyridae). Annals of the Entomological Society of America, 60: 81-91

Anonymous, 1981: Lucibufagins 4 new defensive steroids and a pterin from the firefly photinus pyralis coleoptera lampyridae

Meinwald, J.; Wiemer, DF.; Eisner, T., 1979: Lucibufagins. 2. Esters of 12-oxo-2,5,11-trihydroxybufalin, the major defensive steroids of the firefly Photinus pyralis (Coleoptera: Lampyridae). Fireflies of the species P. pyralis (Coleoptera: Lampyridae) contained a group of closely related steroidal pyrones, named lucibufagins, which serve a defensive role. The 5 major steroids from this insect are characterized as esters of 12-oxo-2.be...

Meinwald, J.W.emer, D.; Eisner, T., 1979: Lucibufagins. 2. Esters of 12-oxo-2beta,5beta,11alpha-trihydroxybufalin, the major defensive steroids of the firefly Photinus pyralis (Coleoptera: Lampyridae). Journal 101(11): 3055-3060

Lall, A.B.; Worthy, K.M., 2000: Action spectra of the female's response in the firefly Photinus pyralis (Coleoptera: Lampyridae): evidence for an achromatic detection of the bioluminescent optical signal. Behavioural action spectra of the threshold of the Photinus pyralis female response to light stimuli simulating the bioluminescent optical signal of the conspecific male firefly were determined in the laboratory. The action spectra (Fig. 1) were n...

Lall; Worthy, 2000: Action spectra of the female's response in the firefly Photinus pyralis (Coleoptera: Lampyridae): evidence for an achromatic detection of the bioluminescent optical signal. Behavioural action spectra of the threshold of the Photinus pyralis female response to light stimuli simulating the bioluminescent optical signal of the conspecific male firefly were determined in the laboratory. The action spectra (Fig. 1) were n...

Meinwald J.; Wiemer D.F.; Eisner T., 1979: Lucibufagins part 2 esters of 12 oxo 2 beta 5 beta 11 alpha trihydroxy bufalin the major defensive steroids of the firefly photinus pyralis coleoptera lampyridae. Fireflies of the species P. pyralis (Coleoptera: Lampyridae) contained a group of closely related steroidal pyrones, named lucibufagins, which serve a defensive role. The 5 major steroids from this insect are characterized as esters of 12-oxo-2.be...

Lall, Ab, 1994: Spectral cues for the regulation of bioluminescent flashing activity in the males of Twilight-active firefly Photinus scintillans (Coleoptera: Lampyridae) in nature. Males of the twilight-active firefly Photinus scintillans initiate bioluminescent flashing when a threshold intensity of ambient light is reached, irrespective of the type of habitat and the spectral cues available. Under dense shrubbery (closed s...