Female Wasp Larvae Eat Brothers for the Good of Their Genes

Bear with us on this one...it might get a little complicated:

Wasps from the genus Copidosoma lay two eggs into a host egg (for example a moth or butterfly egg). One of these two eggs is male and one is female. The male and female larvae then begin multiplying--much like single celled organisms--into a thousand copies of themselves inside the egg. Thus the female "sisters" are more closely related to each other than they are to their brothers, and vice versa. The host egg, however, can only accommodate about half of the thousands of larvae now writhing around within it.

Congratulations! It's a girl. Female wasp larva (right) feasting on its brother (bundle of cells in the middle)

Some of the sister larvae are sterile, and though they cannot reproduce to pass along their genetic material, they CAN stop their brothers from doing so. How? You don't know? By transforming into a serpintine shape with over-sized jaws and eating their brothers alive while they're still just a bundle of cells. Duh.

Evolutionary biologist Andy Gardner of Oxford University explains, "Although the genes for this spiteful behavior find themselves at an evolutionary dead-end in the sterile larvae, copies of these genes are passed onto future generations because they are also present in the clonal sisters, who do survive and reproduce."

"Madeline J. Stingerstein, you stop ravenously feasting on your embryonic brother this instant or you will go to bed without supper this evening, young lady!" Encrytid wasp, Comperia merceti

digg_url='http://zooillogix.blogspot.com/2007/04/female-wasp-larvae-eat-their-bro…';

Tags

More like this

Bear with us on this one...it might get a little complicated: Wasps from the genus Copidosoma lay two eggs into a host egg (for example a moth or butterfly egg). One of these two eggs is male and one is female. The male and female larvae then begin multiplying--much like single celled organisms--…
Few humans have been as successful in Hollywood as parasitoids. Parasitoids are a particularly gruesome kind of parasite that invariably kills its host by the time it becomes an adult and is ready to leave the host's body. A parasitoid female wasp, to give one example, will fly along until it finds…
It's not every day that you hear about spy missions that involve a lack of sex, but clearly parasitic wasps don't pay much attention to Hollywood clichés. These insects merge the thriller, science-fiction and horror genres, They lay their eggs inside other animals, turning them into slaves and…
Parasitoid wasps (or rather, one group of them called the Ichneumonidae) are the subject of one of Charles Darwin's most famous quotations: "I cannot persuade myself that a beneficent and omnipotent God would have designedly created the Ichneumonidae with the express intention of their feeding…