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Wasp Photo Featured in Nature News

February 12, 2009 by myrmecos

cotesiapic
Here’s a sharper version:

Parasitic Cotesia wasp attacks a Manduca larva

Parasitic Cotesia wasp attacks a Manduca larva

The story itself is amazing.  It’s been known for some time that Ichneumonid and Braconid wasps inject circular strands of DNA- called polydnaviruses– into their host insects along with their eggs.  This DNA is encoded by the wasp genome but acts like a virus in their hosts, dismantling the immune system to protect the developing wasp larvae.  In a study out this week in Science, a team headed by Jean-Michel Drezen pinpointed the origin of the polydnavirus as being a type of nudivirus.  It seems that some ancient wasps co-opted insect viruses, incorporating them into their own chromosomes for use against their hosts, and now many of their descendents have honed the viral trick into a finely-tuned weapon.

I photographed this Cotesia congretata wasp ovipositing into a Manduca hornworm last fall, both from lab colonies here at the University of Illinois.  The caterpillars really are blue, the manufactured lab diet prevents them from acquiring the green color of wild caterpillars.

***update*** Science, too

***update 2*** This must be an exciting story, because Ed Yong just blogged it.

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Posted in Science | Tagged Insects, macrophotography, Parasites, Photography, virology, virus | 5 Comments

5 Responses

  1. on February 13, 2009 at 8:47 am Richard

    … and it also featured on the BBC news website http://news.bbc.co.uk/1/hi/sci/tech/default.stm or http://news.bbc.co.uk/1/shared/spl/hi/pop_ups/08/sci_nat_enl_1234532876/html/1.stm


  2. on February 13, 2009 at 10:06 am Olivier

    And also here 😉 :

    http://tempsreel.nouvelobs.com/actualites/sciences/vivant/20090213.OBS4642/un_virus_qui_donne_a_la_guepe_tout_son_piquant.html


  3. on February 13, 2009 at 10:34 am Rick Lieder

    Really nice image, Alex.


  4. on February 13, 2009 at 11:11 am Bug Girl

    Beautiful!


  5. on February 14, 2009 at 4:04 pm myrmecos

    Thanks guys! I’m also enjoying the random incorrect photos that news agencies attach to their articles. Like the one here showing a species of wasp that doesn’t carry the virus.



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