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Bumblebee survey calls for more volunteers

Do you know your Broken-belted from your Gypsy cuckoo?

Bumblebee enthusiasts are being asked to take part in the most high-tech survey of the species ever carried out in the UK.

Photos of bumblebees are  identified using a ground-breaking online ‘crowdsourcing’ technique - where a positive ID is reached when several members of the public allocate it to the same species.

More than 9,000 photos have already been submitted as part of the BeeWatch project which is coordinated by the University of Aberdeen’s dot.rural team and the Bumblebee Conservation Trust (BBCT).

Those behind the survey are calling for more volunteers to send in and identify photos and have made it easier than ever before with the launch of a new online training tool which teaches novices how to identify bumblebees.

“At the moment, only about 5% of our bumblebee submissions are identified by crowdsourcing – that is the collective opinion of several volunteers,” says Dr René van der Wal, Project Leader at the University of Aberdeen. “In principle almost half could be identified by crowdsourcing, and that would allow experts to concentrate only on the submissions that prove too hard for most volunteers to identify. To achieve this we need the public to help by identifying bumblebee images submitted from people across the UK.”

The online training tool will allow volunteers to gain confidence in bumblebee identification, encouraging them to take part in valuable crowdsourcing.

“This will allow far more pictures of bumblebees to be identified, and thus create a far clearer picture of the distribution of bumblebee populations in the UK,” adds Dr van der Wal.

The BeeWatch project was prompted by the decline of the country’s bumblebee species as a result of habitat loss and changes in agricultural practices. As pollinators of crops and wildflowers, bumblebees are crucial to the country’s ecosystems. The BeeWatch scheme will help address the lack of information about which bumblebee species occur where and how this may be changing over time.

Anyone can register to help identify the bumblebees by signing up to the BeeWatch website.

A bumblebee is officially identified once a sufficient number of volunteers have identified it as the same species. If there is disagreement, the image is checked by a bumblebee expert. So far this process has been extremely accurate.

Users who submit a photograph receive automated feedback once their bumblebee has been categorised, along with additional information about the species in the wider context of the UK, such as how common it is and where it is usually found. They are also encouraged to try their hand at identifying other users’ submissions.

“To have crowdsourcing as an operational part of a monitoring programme is a world first,” says Dr Advaith Siddharthan, from the University’s School of Computing Science.  “BeeWatch is, we think, unique in terms of having a statistical model for putting together IDs by different members of the public and estimating the likelihood of their consensus being correct.”

The survey has also revealed information that supports a recent study by the University of London regarding the rise in populations of the Tree bumblebee.  A species unseen in the British Isles until 2001, the BeeWatch survey has confirmed it is now one of the most common in the country.

Dr Richard Comont, Data Monitoring Officer for BBCT adds: “The Tree bumblebee came to UK shores from France in 2001, and our BeeWatch results so far show that it’s now the third most commonly-seen species of bumblebee in the country. At the moment the population is greatest in the south but the first sightings from Scotland have started to come in over the last year or so.

“Whilst some have voiced concerns that the rise of the Tree bumblebee could lead to the demise of other species, our survey has given no indication that their spread so far has been detrimental to other bumblebee species.”

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