Friday, 1 March 2013

Honey bee survival rate better in west of Scotland

Researchers believe the higher death rate of bees in the east may be due to pesticides. 
Published on Monday 25 February 2013 00:02

A “striking” difference in honey bee survival rates between the east and west of Scotland has been recorded by scientists, prompting calls for greater action to tackle the decline of the species.

A team at the University of Dundee studied more than 600 colonies across the country in 2011-12.

Of 274 colonies examined in the east of the country, 58, or 21 per cent, failed.

By contrast, just 14 of 286 colonies failed in the west – a smaller decline of about 5 per cent.

Scientists believe the presence of intensive agriculture and large areas of oilseed rape in the east could be linked to the poorer results for the area.

But they criticised the way data on pesticide use is, or rather is not, gathered, saying the current system makes it impossible to properly determine what is causing honey bees to die.
Lead researcher Dr Christopher Connolly, of the university’s division of neuroscience, said: “What we do have in the east and not the west is intensive agriculture.
Picture: Greg Macvean

“It could be that the lack of natural habitat is the cause. It may be that bees and other pollinators may not be getting such a balanced diet.

“In the west, it’s largely wild crops that they are feeding on, such as trees, heather and gorse.
“It could be that the intensive agriculture and intensive levels of pesticides are contributing to the failure of the bees.

However, even within the east, there were marked differences in death rates. Colony losses in parts of Fife were as high as 30 per cent and the Tweed Valley figure stood at 19 per cent. Edinburgh recorded losses of less than 6 per cent last year.

A further study led by Dr Connolly analysed colony failures over winter across the country. Of 89 colonies that had fed on oilseed rape, 27 failed, a death rate of 30 per cent. By contrast, 13 out of 82 colonies which had not fed on oilseed rape died – a smaller failure rate of 16 per cent.

Dr Connolly believes nicotine-based pesticides, neonicotinoids, may be contributing to the deaths of bees feeding on the crop, which is more commonly grown in the east.

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