Disease and inbreeding might have caused US bumblebee decline over the past few decades say scientists
Alok Jha
Guardian
The abundance of four common species of bumblebees in the US has dropped by 96% in just the past few decades, according to the most comprehensive national census of the insects. Scientists said the alarming decline, which could have devastating implications for the pollination of both wild and farmed plants, was likely to be a result of disease and inbreeding.
Bumble bees are important pollinators of wild plants and agricultural crops around the world including tomatoes and berries thanks to their large body size, long tongues, and high-frequency buzzing, which helps release pollen from flowers.
Bees in general pollinate some 90% of the world’s commercial plants, including most fruits, vegetables and nuts. Coffee, soya beans and cotton are all dependent on pollination by bees to increase yields. It is the start of a food chain that also sustains wild birds and animals.
But the insects, along with other crucial pollinators such as moths and hoverflies, have been in serious decline around the world since the last few decades of the 20th century. It is unclear why, but scientists think it is from a combination of new diseases, changing habitats around cities, and increasing use of pesticides.
Sydney Cameron, an entomologist at the University of Illinois, led a team on a three-year study of the changing distribution, genetic diversity and pathogens in eight species of bumblebees in the US.
By comparing his results with those in museum records of bee populations, he showed that the relative abundance of four of the sampled species (Bombus occidentalis, B pensylvanicus, B affinis and B terricola) had declined by up to 96% and that their geographic ranges had contracted by 23% to 87%, some within just the past two decades.
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