Bumblebees escape predators by slowing down their 'race for food'

Washington, September 5 : A new study by scientists from Queen Mary, University of London, has suggested that bumblebees learn to avoid camouflaged predators like crab spiders by sacrificing their foraging (hunting for food) speed for detecting the animals.

One of the bumblebee's main predators is the crab spider.

Crab spiders hunt pollinating insects like bees and butterflies by lying in wait on flowers, and are particularly difficult for their prey to spot because they can change their colour to blend in with their surroundings.

According to a report in New Scientist, Dr Tom Ings and Professor Lars Chittka from Queen Mary's School of Biological and Chemical Sciences wanted to discover whether bumblebees could learn to avoid these crab spiders.

Their study shows how a run in with a spider affected the bees' foraging patterns.

Dr Ings and his team allowed a colony of bumblebees (Bombus terrestris) to forage in a meadow of artificial flowers in a 'flight arena', which contained 'robotic' crab spiders.

Some of the spiders were well hidden, others were highly visible.

Whenever a bee landed on a flower which contained a robot spider, the spider 'caught' the bee by trapping it briefly between two foam pincers, before then setting it free to continue foraging.

The team used 3D tracking software to follow the bees' movements, and found that the bees which were caught by a camouflaged spider slowed down their subsequent inspection flights.

Although they lost valuable foraging time by slowing down, they were more likely to accurately detect whether there was a hidden crab spider present.

In addition, the bees which had already been caught a few times the day before by the hidden spiders behaved as if they saw spiders where there were none, i.e. they rejected foraging opportunities on safe flowers, 'just in case' and were more wary than bees which had been caught by the more conspicuous spiders.

According to Dr Ings, "Surprisingly, our findings suggest that there is no apparent benefit to the spider in being camouflaged, at least in terms of prey capture rates. Spider camouflage didn't increase the chances of a bumblebee being captured, or reduce the rate at which the bees learnt to avoid predators."

"But our results did show that the bees which encountered camouflaged spiders were worse off in terms of reduced foraging efficiency," he added.

ANI