How Hungry Maggots Spurred Rapid Evolution
Male crickets new to Kauai, Oahu have altered their wings in just 20 generations
By Elizabeth Armstrong Moore, Newser Staff
Posted Jun 3, 2014 8:53 AM CDT
This Oct. 3, 2011 photo shows the coast of Kauai, Hawaii, where some of the crickets in question live.   (AP Photo/Christina Rexrode)

(Newser) – Two sets of male crickets on neighboring Hawaiian islands have been able to avoid attracting deadly parasitic flies by simply shutting up. The crickets likely arrived from Oceania in the late 1990s, and the flies came from North America around the same time. When the crickets tried to lure nearby females with their evening serenades—the chirping sound produced by scraping one wing across the other—they unwittingly attracted the new predators, pregnant flies who would spray maggots onto their backs. The fly larvae would then burrow into the crickets, grow, and emerge victorious a week later, with nothing but cricket carcasses in their wake. But, scientists were surprised to discover, the cricket wings changed shape to stop producing sound over the course of just 20 generations.

In other words, "in what appears to be the blink of an eye in evolutionary time," the lead researcher tells the BBC. Even more remarkably, scientists also found that the adaptation happened differently and independently, but almost simultaneously, in the populations on Kauai and Oahu, reports Nature—the phenomenon is known as “convergent evolution." And though many of the crickets are now chirpless, they are doing something right; the so-called “flatwing” populations on both Kauai and Oahu are still alive and procreating, while the flies will have to devise a new way to find them. As for how the chirpless crickets find mates? They hang around the few crickets that still chirp, and then steal away some of the females that come calling. (Another fascinating recent cricket discovery: An STD causes the insects to mate like crazy.)

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Showing 3 of 22 comments
TwoSheds
Jun 3, 2014 7:52 PM CDT
Silent spring
fractal
Jun 3, 2014 1:31 PM CDT
In evolution, there is no "cause and effect". Everything ARISES MUTUALLY, because everything is so intimately interconnected in the web of life. Let's face it, life works on a higher order of intelligence than our ego mind, which tries unsuccessfully to "explain" it. With innate intelligence, relationships are where the emphasis is, not on the thing itself. Subject/object are in the background, and the interconnections are in the foreground; since they are "interconnections", everything that happens registers everywhere at the same time, and reverberates thru the larger organism. Hence the analogy to the spider web, where each strand responds in unison with the others, when a bug lands on it. Analog thinking cannot grasp this concept easily, and cannot replicate it. That is why human thought will never be as intelligent and conscious as innate intelligence, no matter how fast our computers get.
Scaramouche
Jun 3, 2014 11:39 AM CDT
" They hang around the few crickets that still chirp, " And how much longer is that going to work? When the noisy crickets go, so will the noiseless ones. We need to get these crickets some Axe Body spray.