Earlier this week I attended the Bumblebee Working Group Meeting at the University of Sussex, a one day event that takes place every two or three years.  It was a very stimulating day with some really interesting work being showcased; here are some examples of things that I learned that day, some questions that these findings have prompted (and the people presenting):

• High arctic/montane bumblebees have undergone (and survived) periods of severe climate change in the past – does this mean they are less sensitive than temperate species to future climate change? (Paul Williams).
• Bumblebees foraging closer to honey bee apiaries are more likely to be infected with a range of bee diseases – presumably picked up from the honey bees, but what is the route of transmission?  (Samantha Alger).
• Queen Buff-tailed Bumblebees exposed to neonicotinoid pesticides have a 26% reduction in the probability of founding a colony, and the effects vary for other species – are the most sensitive species the ones that have declined the most since the mid-90s? (Gemma Baron).
• Simulating bumblebee colony dynamics with the Bumble BeeHave model is producing comparable results to field data on male and queen production (Matthias Becher).
• Environmental Stewardship Schemes appear to enhance bee nest densities on farms where they are situated – but are some species already at saturation point on those farms? (Tom Wood).
• New, tougher EU guidelines for risk assessment of effects of pesticides on bees have been developed and are being tested at the moment (James Cresswell).
• The annual spread of the Tree Bumblebee, Britain’s newest bumblebee species, is about 35km per year (Liam Crowther).
• The equivalent of 737,914 bramble flowers are needed to provide the resources support a single colony of Buff-tailed Bumblebees for one year (Ellie Rotheray).
• The moratorium on neonicotinoids seems to have had the desired effect of reducing the amount of these pesticides being taken up by bumblebee colonies in pollen and nectar (Beth Nicholls).
• There have been significant range extensions of some of our rarer bumblebee species in Essex over the last 15 years or so – has this also been happening in other counties? (Ted Benton).
• Sites with greater levels of radioactive contamination at Chernobyl have fewer older bees – does this mean that the radiation is affecting their lifespans?  (Katherine Raines).
• Buglife’s B-Lines project continues to develop and gain momentum (Laurie Jackson).
• The Short-haired Bumblebee reintroduction project has recorded workers every year since 2013.  However there have also been reintroductions of queens from Sweden every year – so are the queens surviving over-winter and founding new colonies? Or are the workers just from the new queens each year? (Nikki Gammans).

Thanks to all the speakers, it was a great meeting, and special thanks for Dave Goulson for his hospitality and for organising the event.

A number of people were tweeting from the event using the hashtag #BBWG16 – follow the link for more comments and some images, including a couple of yours truly in action – one of which I’ve stolen (below).