Tag Archives: Biodiversity

How to deal with bumblebees in your roof [UPDATED]

Bombus hypnorum

This week I’ve had two enquiries from colleagues at the University of Northampton asking advice on what to do about colonies of bumblebees that have set up home in their roofs. In both cases these were nests of the Tree Bumblebee (Bombus hypnorum), a species that only colonised the British Isles in 2001 and has since spread rapidly (see this post from last year for a more detailed account). Because of their association with human settlements they are significant pollinators of garden produce: over the past few weeks I’ve been watching them pollinating the raspberries in our garden and we now have a large crop.

But having a bee nest in your home is, for many people, a real concern. I thought it might be useful to discuss the issue by quoting from the email correspondence I had with my first colleague, Paul.

Paul wrote: I wonder if you can give me some advice. I returned home from holiday on Saturday to find that a colony of bees had taken up residence in a roof space above my front porch. The bees are not domestic honey bees but large bumblebees with white rears. I am not sure how many there are, they buzz furiously when I close the door….. They are not in the house and I cannot see them from my loft…..so they are not causing a problem at the moment other than a moderate dead rabbit smell in the porch.

I am considering contacting the local council pest controllers, but fear they may just gas and kill them as they are not honey bees. What would your advice be, would it be safe to leave them alone, if so how long are they likely to stay, how large is the colony likely to become, are they likely to cause any damage or mess?

Here’s my response: From your description they are almost certainly Tree Bumblebees which often use loft spaces, bird boxes, etc. As the name suggests they naturally nest in holes in trees. The colony is not likely to get much bigger though over the next few weeks you may find males patrolling the front of the nest, waiting for the virgin females to emerge so that they can mate. That sometimes makes the colony seem larger than it actually is – there are not likely to be more than about 150 bees in there.

I’ve had Tree Bumblebees in my roof a few times and they’ve never caused any damage. All bumblebee colonies die over the winter and the newly-mated females fly off and hibernate. So by late August or September (perhaps earlier if the weather ever gets warmer….) the bees should have gone. At that time you could seal the entrance to the roof space, though they are unlikely to return next year (although it’s not unknown).

Yes, a pest controller would kill the colony. But they are unlikely to be aggressive unless you stick your fingers in the nest hole! My advice is to let them be and take pride in your own bee colony – they are very discerning and don’t nest just anywhere 🙂

So there you have it: my advice is, leave them alone. Of course if you or your family have a particular sensitivity to bee stings you may need to think carefully about this advice, but in my experience bumblebees are only aggressive if they feel directly threatened. In over 25 years of field work focused on bees and other pollinators, I’ve only ever been stung a few times, and mainly by honey bees.

UPDATE: A commenter on Facebook had a great suggestion, that I provide a link to Dave Goulson’s nice little video showing what the inside of a bumblebee nest looks like – so here it is.

What does Brexit mean for British biodiversity?

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Friday 24th June 2016. What a surreal day. I spent it trying to understand why a small majority of the voting public had committed us to leaving the European Union, an organisation that has had a demonstrably positive impact upon our lives, our society, our economy, and our environment. That dream-like state was not helped by the fact that I’d stayed up most of the night with my youngest son James, watching the results roll in.

Saturday 25th June 2016. Twenty four hours later, after a good night’s sleep, I feel less dislocated but no less confused and disappointed. It is what it is, let’s get on with it.

It’s much too early to properly answer the question of what this all means for British biodiversity, of course. But as I pointed out in my post about the environmental arguments for remaining in the EU, there’s a whole raft of policies, legislation, agreements and initiatives that the government and NGOs need to consider. Just to give a couple of examples, what will happen to the All-Ireland Pollinator Plan, or the Special Protected Area status of places such as the Upper Nene Valley?

What I really hope is that we can continue as before, building on the current situation rather than tearing up the whole thing. To some extent I’m optimistic that we can for the near future, because the government will have (as it sees it) bigger things to worry about. But I do worry that eventually we will get left behind as EU environmental legislation evolves. That’s something we have to be mindful of in the coming years.

The ecological internet is already starting to discuss these issues; here are links to a few pieces that I’ve seen:

Adventuresinbeeland has discussed what leaving the EU means for British bees and beekeepers, pointing out that EU funding has enabled bee inspectors to carry out apiary inspections and work with beekeepers on issues such as bee pests and diseases.

The Wildlife Trusts are trying to look positively at the future, with Brian Eversham, Chief Executive for the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire, summing it up very well: “Many of those who disagreed over the Referendum agree strongly that wildlife, our countryside and the natural environment matter, now and for the future. We need their voices loud and clear in the coming months. As we are now responsible for our own, independent future, it is up to all of us to make sure that we keep the environment firmly on the national agenda.”

Mark Avery has also summed up the current situation very succinctly on his blog – one cartoon says an awful lot.

Finally, here’s Craig Bennett, CEO of Friends of the Earth, writing on how can we make Brexit work for the environment?

No doubt there will be more coming soon and I’ll try to provide updates on the blog.

In terms of my day job as an academic at the University of Northampton, things will also change across the whole British Higher Education sector, of course. On one level that’s a different set of issues to what I’ve been discussing, but there are also links: a great deal of ecological research activity is being funded by the European Union and involves cross-border collaborations. Scientists across Europe have to continue to make that work.

Silver Medal for the BES’s pollinator’s display at RHS Chelsea Flower Show!

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RHS Silver Medal

An early train to London yesterday got me to the RHS Chelsea Flower Show in time for the gates opening at 8am. I’d agreed to spend the day staffing the British Ecological Society’s Animal Attraction: The garden and beyond display, which deals with the relationships between plants and their pollinators – see my recent posts here and here.

The first thing I noticed as I approached the display was how impressive and well designed it looked, with some wonderful planting to complement the simple, bold scientific information. The second thing I noticed was that we had won a Silver Medal! The whole team was very pleased – it’s the third year that the BES has been represented at Chelsea, but the first time that it’s won a medal. I’m proud to have made a small contribution to that by advising on the plants and the scientific content, but the main kudos goes to the BES’s staff and to the garden designer Emily Darby.

Over the course of a long day we talked to hundreds of visitors about the display, what it represented, and the different ways that flowers are adapted to their pollinators. There was a huge amount of public interest and support, very gratifying to see. Here’s some pictures from the day:

RHS display

RHS crowd

RHS crowd with fig

RHS Jeff

RHS display

Pollinators at RHS Chelsea Flower Show

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20160518_114732

Pollinators, as regular readers of this blog will know, are diverse and important, both ecologically and agriculturally. But that diversity is declining and it’s an issue that deserves greater publicity and action.

To that end, for the past eight months I’ve been advising a team from the British Ecological Society (BES) on the content for a display at the RHS Chelsea Flower Show which is running all next week. The display is called “Animal Attraction: The Garden and Beyond” – if you follow that link you’ll get a sense of what the display is all about, but in essence there are three key messages that the BES is trying to get across:

Celebrating the diversity of pollinators (not just bees!) both in the UK and globally.
Flowers have evolved many different ways of attracting and rewarding pollinators, leading to the fantastic diversity of floral form that gardeners appreciate.
Planting a diversity of flowers in your garden can only be a good thing for helping conserve pollinator populations.

As you can see from my wristband, I’ll be helping to staff the stand all day Tuesday 24th May, so if you’re at the show come and say hello and take a look at what the BES team has produced.

Design and Testing of a National Pollinator and Pollination Monitoring Framework – report published today

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B pasc on sunflower

This morning there were swifts flying above the garden – summer’s [almost] here! As if on cue, the eagerly anticipated report on “Design and Testing of a National Pollinator and Pollination Monitoring Framework“, one of the key recommendations of the National Pollinator Strategy, has been published today by Defra. Here’s a link to the report and its annexes.

I’ve not had time to read the full report, and even the Executive Summary (ES) is quite long and detailed, but the Conclusion to the ES captures the key points (emphases in bold are mine):

“…there is considerable scope to enhance monitoring of pollinators and pollination services to ensure a robust and rigorous evidence-base to support the needs of policy, however this project has demonstrated clear trade-offs between likely cost and data quality, especially in terms of the taxonomic resolution and accuracy of species identifications. Currently the volunteer sector, namely the NSS*, provides the expertise to deliver monitoring of changes in species occurrence or distributions at a national scale for many, but not all, species. Indeed the total value of voluntary work provided by BWARS and HRS….is estimated, based on current levels, to reach in excess of £5M over ten years. Repeated systematic sampling from a stratified network of sites not typically covered by the NSS has the potential to add considerable value, providing data on pollinator abundance that may link with provision of pollination services and filling gaps in the spatial extent and species coverage. Enhancements to improve the range and accuracy of monitoring pollinators and pollination services over large spatial and temporal scales will depend on adequate resources to support capacity building, coordination and implementation.”

In summary, the volunteer schemes are a hugely valuable asset that need to be enhanced by funding from the public purse in order to set up a pollinator and pollinator monitoring scheme that will be fit for purpose. Will the current Government show the necessary vision and leadership to provide that funding? Watch this space….

* NSS = National Recording Schemes and Societies, e.g. Bees Wasps and Ants Recording Society (BWARS), Hoverfly Recording Scheme (HRS), etc.

Six bees, one stone: recent pollinator-related talks and workshops

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BBKA lecture April 2016 As I write this I’m painfully conscious that (a) it’s a couple of weeks since I last posted on the blog; and (b) I have a long list of things to complete before I head off to Tenerife for ten days of field work on Friday. The absence of posting has been due to my current work load, including the number of conferences, talks and workshops I’ve been involved with in the past month, which seems to have taken up a disproportionate amount of my time. It’s all been interesting and useful, however, and reflects the rising activity stemming from the National Pollinator Strategy, and increasing interest in pollinators more broadly. I’ve certainly learned a lot and hopefully my own expertise contributed to the success of these events.

In this post I thought I’d briefly summarise what I’ve been up to recently, in the process expanding the numerical and phylogenetic parameters of “killing two birds with one stone“:

16th March – took part in a workshop to map the latest phase of Buglife’s B-Lines across Bedfordshire, Northamptonshire, Buckinghamshire and Oxfordshire. This was a really interesting exercise and I felt that we’d actually achieved rather a lot by the end of the day. Once the final maps are completed I’ll post a link so you can see where the routes go through these counties and how they meet up.

23rd March – spoke at a one-day conference on “delivering biodiversity” organised by the Environmental Association of Universities and Colleges at the University of Worcester. Although I was talking about our bird surveys on the University of Northampton’s new Waterside Campus, pollinators did receive some attention during a workshop on creating wildflower meadows. I’ll post an update on the Waterside work once we’ve completed the next set of spring surveys.

30th March – spoke at the Bumblebee Working Group at the University of Sussex – have already posted an account of that.

6th April – took part in a”Pollinator Experts Elicitation” workshop at the University of Warwick, along with a group of nine other academics, and members of stakeholder groups such as FERA and the NFU. Run as part of Warwick’s Food and Behavioural Science Global Research priority groups, the organisers, from the university’s Department of Statistics, used the Delphi Method to assess the likelihood of sustaining pollinator populations under different scenarios of disease, climate change, and habitat degradation. It was a fascinating process and interesting to see how often experts’ views converged on the same opinion. Also rather humbling to see the degree of our uncertainty in our forecasts. The workshop garnered quite a bit of media attention including pieces on the BBC’s Midlands Today and the Farming Today programmes.

8th-9th April – delivered two lectures at the British Beekeepers Association’s Spring Convention at Harper Adams University. Rather disconcerting to be the least-informed person in the room, given my limited knowledge of bee keeping, but they were a friendly and curious lot with good-sized audiences for my talks on the diversity of bees to be found in urban settings, and the global diversity and functional importance of pollinators.

13th April – spoke to a very receptive audience at the Friends of Linford Lakes Nature Reserve near Milton Keynes, on the topic of “Bees for dinner? The importance of pollinators in a changing world“. Great evening and lots of interesting questions afterwards, though my talk was a bit too long (must cut it for next time).

That’s it for now, hope to do some posts from Tenerife while we are there.

What I learned at the Bumblebee Working Group Meeting

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20160330_171209 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).

Jeff at BBWG 2016

“Progress in pollination and pollinator research” meeting – University of Reading – 20th April

Special issue of Leaf Litter devoted to pollinators

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Leaf Litter

A short while ago I was interviewed by an American journalist as part of a special issue of the online newsletter Leaf Litter devoted to pollinators. Produced by a conservation planning and ecological restoration organisation called Biohabitats, this special issue includes:

» Thoughts on Pollinators
» Expert Q&A: Jeff Ollerton
» Expert Q&A: Jerome Rozen
» Expert Q&A: Eugenie Regan
» Inspiration: Promising Progress With Pollinator Habitat
» Non-Profit Spotlight: The Xerces Society
» Video: An ecological planner walks into a cider mill…
» How Saving Pollinators Can Save Water and Fish Resources
» Biohabitats Projects, Places, and People

Here’s a link to Leaf Litter.

Bumblebee Working Group meeting – University of Sussex – 30th March

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Bombus hypnorum

It’s been three years since the last meeting of the semi-formal Bumblebee Working Group, which I hosted at the University of Northampton, and British Bombus researchers are eagerly looking forward to the next one which is being organised by Professor Dave Goulson at the University of Sussex on 30th March. There is no charge and if anyone with an interest in bumblebees wishes to attend, please contact Dave.

Here’s the programme for the day, which starts at 10am and finishes at 4.30pm:

Goulson, Dave – Welcome

Williams, Paul – Bumblebees of extreme environments

Alger, Samantha – RNA viruses in Vermont bumblebees

COFFEE BREAK

Baron, Gemma – Impacts of a neonicotinoid pesticide on colony founding bumblebee queens

Becher, Matthias Bumble – BEEHAVE: using bumblebee colony models as a conservation management tool in agricultural landscapes

Breeze, Tom – Knowledge gaps for effectively valuing pollination services

Cresswell, James – New European Union protocols for testing the toxicological impacts of agro-chemicals on bees

Crowther, Liam – Inferring invertebrate dispersal distances from biological records

LUNCH

Rotheray, Ellie – Quantification of the floral landscape in agro-ecosystems and its effect on bumblebee colonies

Nicholls, Beth – Pesticides in rural and urban bumblebee nests

Benton, Ted – Status of the BAP carders in Essex

Ollerton, Jeff – Exceptional urban nest density of the Tree Bumblebee Bombus hypnorum during summer 2014

SHORT BREAK

Raine, Katherine – Chernobyl bumblebees: Understanding fitness consequences of living in the exclusion zone

Jackson, Laurie – B-lines

Gammans, Nikki – An update on the progress of reintroducing the short-haired bumblebee, Bombus subterraneus