November 17, 2009
Ladybugs Taken Hostage By Wasps
University of Montreal researcher studies odd insect behavior
Are ladybugs being overtaken by wasps? A Universit© de Montr©al entomologist is investigating a type of wasp (Dinocampus coccinellae) present in Quebec that forces ladybugs (Coccinella maculata) to carry their larvae. These wasps lay their eggs on the ladybug's body, a common practice in the insect world, yet they don't kill their host.
A larva cocoons between the ladybug's legs and moves on once it matures. Brodeur is currently studying the phenomenon at the Universit© de Montr©al Institut de recherche en biologie v©g©tale. He hopes to understand the cycle duration, success rate and the host-parasite relationship.
"Can the ladybug refuse to be used? We don't know. Our plan is to reproduce a variety of situations in the lab and see which is most favorable to reproduction," he says.
Wasps aren't alone in offloading their offspring, stresses Brodeur, since magpies look after the chicks of great spotted cuckoos. The cuckoo visits the nests where it leaves its young and kills those magpies that don't protect their offspring. And a variety of parasite behaviors exist in the insect world, yet the dynamic between the Dinocampus coccinellae and Coccinella maculata is unusual and one Brodeur hopes to better understand.
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