Larval and Adult Emission Spectra of Bioluminescence in Three European Firefly Species^¶

Abstract

We studied the spectral characteristics of the larvae of three sympatric Belgian species of fireflies, Lampyris noctiluca, Phosphuenus hemipterus and Lamprohiza splendidula. An in vivo spectral study was performed to compare bioluminescence spectra. The emission spectrum of a laboratory reared female L. noctiluca was recorded by a different, more exact method. The mean peak wavelength (kmm = 546 nm) and shapes of the unimodal emission spectra are visually similar for the larvae of all three species. The emission spectrum of the adult female L. noctiluca peaked in the same range as the larval bioluminescence between 546 and 551 nm. The bandwidth at half-maximum intensity was slightly greater for larval L. noctihca (77 2 4 nm) compared with P. hemipterus (70 2 10 nm). The bandwidth of larval L. splendidula (77 f 8 nm) was not different compared with the other larvae, whereas the females' bandwidth was somewhat narrower (68 nm). The ecological significance of the color of bioluminescence and conservancy of green emission in larval fireflies and other luminescent beetle larvae is discussed.Roland Caubergs and Joeri Horvath for the use of, and assistance with, the Aminco-Bowman spectrofluorometer; Prof. J.W. Hastings, David Booth and two anonymous referees for valuable improvements of this paper; Anthony James for the setup of optics; Prof. A.K. Campbell for his valuable hint on octopamine; and, Laurence Tisi for the provision of the female's spectrum and enthusiastic support. This study was supported by a PhD grant for specialization of the "Vlaams Instituut voor de bevordering van het wetenschappelijk-technologisch onderzoek in de industrie" (I.W.T.).

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Leave me alone: solitary females attract more mates in a nocturnal insect

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Spectral tuning of bioluminescence and visual sensitivity in males of Brazilian firefly species inhabiting dim light environments (Coleoptera: Elateroidea: Lampyridae)

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