The Lychnis moth (Hadena bicruris) is laying more eggs on white campion (Silene latifolia), due to the increasing fragmentation of the countryside. Dutch researcher Jelmer Elzinga studied how many white campion seeds were eaten by Lychnis moth caterpillars at various locations along the River Waal.
Elzinga discovered that at small and isolated locations, Lychnis moth caterpillars consumed more white campion seeds. This increased consumption was thought to be due to a decrease in the number of ichneumon flies, which kill the caterpillars. However, Elzinga demonstrated that this hypothesis is not correct.
Upon hatching, Lychnis caterpillars eat the seeds of the white campion on a massive scale. Half of these caterpillars die prematurely due to attacks by ichneumon flies. The increasing fragmentation of the countryside means that areas of natural habitat are becoming smaller and more isolated. Moths, such as the Lychnis, are thought to easily spread between the various fragments whereas the much smaller ichneumon flies cannot.
Dr A. (Arjen) Biere | EurekAlert!
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