Bumblebees hit by ‘Beast from the East’ and heatwave
● More than half of UK population lost after harsh weather in 2018
Last year’s “Beast from the East” snow storm and a scorching summer hit bumblebee population sin Scotland and the UK, with numbers dropping to their lowest in the past six years.
Beewalk surveys, carried out by volunteers across the UK, show 13 of the country’s 24 species declined last year.
These include some of the country’s best known breeds, including buff-tailed and white-tailed bumblebees.
Other species which are usually common in gardens also fared badly in 2018, including garden and heath bumblebees. The early bumblebee, a spring specialist, had a particularly bad year – its worst since a rain-soaked 2012.
The report from the Bumblebee Conservation Trust (BCT) showed most species got off to a shaky start and only reached normal numbers in July.
Experts said this suggests queens were late out of hibernation and slower to produce big numbers of workers.
As a result many species declined more quickly than usual as the year progressed, particularly as flowers wilting in the summer heatwave reduced food supplies.
However, some rare species saw in creases in their numbers in 2018, including the brown-banded card er, shrill carder and large garden bees. All three are traditionally late-emerging species, so were unlikely to have been significantly affected by freezing March temperatures.
There was insufficient data to assess the for tunes of the country’ s rare st bumblebee, the great yellow, which is found only in a few isolated places in the north of Scotland.
Dr Richard Comont, science manager for the BC T, said: “While it is great to see the four biggest species winners from our latest Beewalk data are rare bumblebees, it’s concerning to see four of our seven commonest bumble - bees have declined over the last nine years.”
Experts have raised concerns that last year’s extreme weather could have reduced the number of queens that made it into hibernation over winter, which could affect current populations.
Additionally, they say the likelihood of increasingly frequent heatwaves could spell trouble for UK bumblebees in the longer term.