Planet Earth

Sex increases risk of being paralysed, buried, eaten alive (for locusts)

Not Exactly Rocket ScienceBy Ed YongOct 26, 2011 11:13 AM

Newsletter

Sign up for our email newsletter for the latest science news
 

You know how it is: one minute you’re having sex and the next, your partner has been stung and paralysed, and you’re being dragged off to a burrow by your genitals only to be buried and eaten alive. Such is the life of the Australian plague locust, a common pest that is targeted by the black digger wasp. The wasp is a parasite that creates living larders for her grubs. She stocks them with the bodies of paralysed insects. Last December, the locusts formed dense plagues in southeastern Australia just as the wasps were starting to collect fresh meat for their young. And Darrell Kemp from Macquarie University was watching as the two species collided. Kemp found that mating locusts were far more likely to be targeted by the wasps than lone individuals. The pairs accounted for 3 percent of all the locusts in the area, but they made up 30 percent of the wasps’ targets. For lone locusts, the odds of being captured by a wasp were 1 in 200 for females and virtually zero for males. If they were having sex, those odds went up to 1 in 10. The risk was particularly poignant for the males. The wasps only ever stung the females but the males, unable to detach their penises, were “trapped in coitus” and “ultimately entombed alive”. Several scientists have suggested that sex is a risky business for animals because they’re more conspicuous to predators and less likely (or able) to escape. However, there are few solid examples to back up this idea; Kemp’s study is one of them. Reference:

Kemp, D. (2011). Costly copulation in the wild: mating increases the risk of parasitoid-mediated death in swarming locusts Behavioral Ecology DOI: 10.1093/beheco/arr173

1 free article left
Want More? Get unlimited access for as low as $1.99/month

Already a subscriber?

Register or Log In

1 free articleSubscribe
Magazine Examples
Want more?

Keep reading for as low as $1.99!

Subscribe

Already a subscriber?

Register or Log In

More From Discover
Recommendations From Our Store
Shop Now
Stay Curious
Join
Our List

Sign up for our weekly science updates.

 
Subscribe
To The Magazine

Save up to 70% off the cover price when you subscribe to Discover magazine.

Copyright © 2021 Kalmbach Media Co.