. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 238 JOHN BUCK AND JAMES F. CASE at least the female occasionally produces compound flashes (Fig. 6) as does the female of the Maryland Photuris (Fig. 8 of Hastings and Buck). In larvae of most lampyrid fireflies the photogenic organ is much smaller and simpler than the adult lantern, and light is emitted as a long glow rather than a short flash. No spontaneous glows were recorded, because of their very irregular timing and low frequency, but the kinetic contrast between larval and adult lumines- cence is well illustrated by
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 238 JOHN BUCK AND JAMES F. CASE at least the female occasionally produces compound flashes (Fig. 6) as does the female of the Maryland Photuris (Fig. 8 of Hastings and Buck). In larvae of most lampyrid fireflies the photogenic organ is much smaller and simpler than the adult lantern, and light is emitted as a long glow rather than a short flash. No spontaneous glows were recorded, because of their very irregular timing and low frequency, but the kinetic contrast between larval and adult lumines- cence is well illustrated by the induced glow (Fig. 11 ; note time scale). Actually, the duration of the larval glow is usually even longer in nature—often several sec- onds—but in view of our observations at different temperatures (see below) this is quite possibly accounted for by the temperature of the soil surface being considerably below 25°, particularly on the damp evenings in early autumn when larvae are most easily observed. 2. Induced flashing : general Although, as will be shown, it is possible to alter flash duration, intensity and form by changing stimulus parameters, a single, moderate electric shock usually elicits a flash indistinguishable from the normal spontaneous flash characteristic of the species. Seemingly normal flashes can result with the electrode pair at any level of the body from head to lantern, but are usually most reliably produced with ab- 30 i 20 - C/) ~O. 0 10 Duration 20 Mscs 30 FIGURE 16. Representative strength-duration curve for minimum visually detectable response induced by direct stimulation of lantern of a decapitated Woods Hole Photuris Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. )
Size: 1024px × 2440px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
