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June 20, 2007 23:06:30
This moth grub glows in the dark after death. The interactions between species that led to a glowing bug corpse are intricate. It all began when a pradatory nematode (Heterorhabditis bacteriophora) bored into the body cavity of the grub. This nematode has a special pouch in its gut where it stores an obligate symbiotic bacteria (in this case Photorhabdus sp.). A small amount of this bacteria is expelled inside the live grub. In an interesting twist that science has not yet found an answer for, the bacteria is bioluminescent. The bacteria proliferate, killing and digesting the grub. All the while, the corpse of the grub glows by the illumination of the bacteria inside of it. The nematode feeds on the decomposing grub and the bacteria, ultimately depositing eggs in the grub. All of the hatching nematodes will inoculate special areas in their guts with the bacteria to move out of the corpse and hunt on their own. This is an important association for the bacteria because it has never been found outside of a glowing grub corpse or from within the guts of these nematodes.