Adult spruce bark beetles in their galleries in the bark of a Norway spruce tree. The beetle in the middle is infected with the fungus Beauveria bassiana.
© Benjamin Weiss, Max Planck Institute for Chemical Ecology
A paper recently published in the Proceedings of the National Academy of Sciences of the USA (PNAS) has raised the spectre of evolutionary arms races for creationism. Evolutionary arms races are something of a nightmare for creationists because, within the paradigm of intelligent design by a single designer, having an arms race with yourself makes no sense at all.
Evolutionary arms races are among the strongest arguments against intelligent design, as I point out in my book, The Unintelligent Designer: Refuting the Intelligent Design Hoax. They epitomise stupidity. What on Earth is the point of designing a solution to a problem for one species, only to treat that solution as a problem to be solved for another? It is almost exactly as if two organisms are evolving in response to changes in their environments, of which their predator or prey is a key component. It makes less sense than a dog chasing its own tail – at least the dog gets some exercise.
The arms race reported in this paper, by a research team at the Max Planck Institute for Chemical Ecology in Jena, Germany, is between the spruce bark beetle, Ips typographus, and the pathogenic fungus Beauveria bassiana.
In fact, there are two arms races at work here. The first is between the Norway spruce, Picea abies, and its microbial environment. The tree produces antimicrobial phenolic compounds as a defence. The spruce bark beetle has evolved the ability to convert these compounds into an even more toxic derivative, which helps protect the beetle and enables it to successfully colonise the spruce.
The clever twist is that the fungus Beauveria bassiana has evolved a countermeasure. It converts the beetle’s toxic compound by binding a sugar molecule to it and adding a methyl group. This modification effectively neutralises the beetle’s antifungal defence, making it more susceptible to fungal infection.
Translated into creationist terms, a designer first designed a defence for the spruce that can be exploited by a parasitic beetle to protect itself from microbes, including a pathogenic fungus. The same designer then designed a pathogenic fungus capable of neutralising the beetle’s defences, allowing it to infect the beetle more efficiently.




































