Shunning the night to elude the hunter: diurnal fireflies and the “femmes fatales”

Lucidota atra, a diurnal firefly, shares possession of defensive steroids (lucibufagins or LBGs) with nocturnal fireflies of the genus Photinus. Photinus are protected against predators by their LBGs, but not against fireflies of the genus Photuris, the so-called firefly femmes fatales, which prey u...

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Bibliographic Details
Published in:Chemoecology 2006-03, Vol.16 (1), p.39-43
Main Authors: Gronquist, Matthew, Schroeder, Frank C., Ghiradella, Helen, Hill, David, McCoy, Erin M., Meinwald, Jerrold, Eisner, Thomas
Format: Article
Language:English
Subjects:
Diurnal
Fireflies
Lampyridae
Nocturnal
Photinus
Photuris
Predators
Prey
Steroid hormones
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Summary:Lucidota atra, a diurnal firefly, shares possession of defensive steroids (lucibufagins or LBGs) with nocturnal fireflies of the genus Photinus. Photinus are protected against predators by their LBGs, but not against fireflies of the genus Photuris, the so-called firefly femmes fatales, which prey upon Photinus, thereby acquiring LBGs for their own defense. We propose that L. atra may have been prompted evolutionarily to become diurnal by the opportunity to avoid, thereby, being hunted by Photuris. Indeed, L. atra, if offered to Photuris, were eagerly devoured by the latter, which sequestered their LBG’s. In feeding on L. atra, Photuris may be driven by a gustatory affinity for LBGs. Persistent nocturnality might therefore have put L. atra at risk vis à vis Photuris. Diurnality freed the firefly from that risk, without compromising its defended status with respect to other predators. Possession of LBGs may in fact account for L. atra’s unacceptability to birds and spiders.
ISSN:0937-7409
1423-0445
DOI:10.1007/s00049-005-0325-5