Almost 80% of crop pollination by wild bees is provided by just 2% of the most common species, say scientists.
In the UK, a small number of bees are vital for crops such as oilseed rape, apples and strawberries, according to the University of Reading team.
But protecting a wide range of bees would “provide an insurance policy against future ecological shocks, such as climate change”, the scientists say.
The value of wild bee pollination is estimated at £1bn a year in the UK.
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“It is critical to protect a wide range of bees and other insects now so that, as Britain’s climate, environment and crop varieties change, we can call on the pollinating species which are best suited to the task.
“We can’t just rely on our current starting line-up of pollinators.
“We need a large and diverse group of species on the substitutes’ bench, ready to join the game as soon as they are needed, if we are to ensure food production remains stable.”
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