Category Archives: Bees

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.

The environmental argument for the UK remaining in the European Union

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Every week I receive an email bulletin called Science for Environment Policy, sent out by the Directorate-General for Environment, which is the European Commission department that sets and monitors European Union policies relating to the environment, for example pollution levels, conservation of biodiversity, etc. Anyone can subscribe to these bulletins and they provide useful, lay-person summaries of recent research findings that have a direct or indirect bearing on how we manage and protect Europe’s environment.

A scan through the latest few bulletins reveals article titles such as:

Atlantic beaches of Europe reshaped in stormy winter of 2013–2014
Water management: five policy conditions to help overcome the challenges of an uncertain future
Climate change threatens early-flowering plants due to lack of snow
Black carbon emissions of individual cars measured under real conditions
Are endocrine disrupting chemicals responsible for downward trends in male fertility?
Environmental performance of construction and demolition waste management
Golden jackal should not be treated as an alien species in Europe
Environmental taxation in the right place can increase business productivity

This set of topics is fairly typical, and demonstrates the complexity and breadth of the environmental issues facing the European Union. All of these issues, however, share one feature: they do not respect political boundaries and are cross-border in scope. Species, rivers, air masses, sea currents, economic resources, waste products: all of them can (and do) move through the different countries of Europe and beyond.

What this means is that the policies, laws and regulations that govern the behaviour of individuals and organisations towards the environment, and ultimately protect it, must also be cross-border in scope. That’s where the European Union comes in, because it is largely EU directives that currently protect our environment. Some examples of these directives, and some of their achievements, include:

Birds Directive which has helped to coordinate action plans for endangered resident and migratory birds.

Industrial Emissions Directive that determines what large industries can and cannot release into the environment, and has had a significant effect on improving the quality of Europe’s air.

Habitats Directive that relates to the conservation of natural habitats and the fauna and flora they contain, including setting up the Natura 2000 network that currently covers more that 18% of the EU’s land area and almost 6% of its marine territory, making it the world’s largest coordinated network of protected areas.

Water Framework Directive that determines action in the area of water policy.

Waste Framework Directive likewise determines action in the area of wastes policy and which, together with the Landfill Directive and the Waste Electrical and Electronic Equipment Directive, has been responsible for significantly reducing the amount of waste going into landfill, increased the amount being recycled, and placed pressure on manufacturers to take responsibility for packaging and end-of-life goods and materials.

There are many others, and you can find a list here. It’s worth pointing out that these directives were not “imposed” on the UK by faceless bureaucrats in Brussels: the UK took an active role in their development and drafting. In fact Boris Johnson’s father, Stanley Johnson, was one of the original authors of the Habitats Directive and is a prominent advocate of remaining in the EU.

Of course, no one is arguing that these directives are the only mechanism for protecting the environment, there are local regulations too, plus the work of NGOs such as the RSPB and the Wildlife Trusts. Nor am I arguing that they have been wholly effective: there’s still a long way to go in many of these areas. But they have had a demonstrably positive impact on the quality and protection of the UK’s environment that could be halted, or even reversed, if the UK was to leave the EU.

This last point is an important one to make and it’s not an example of the fear-mongering that has marked the EU Referendum debate on both sides. Here is how I see it: we cannot trust the UK government (whatever its political flavour) to safeguard our environment.

This is because, despite the best efforts of genuinely committed and environmentally savvy politicians, the political parties to which they belong are too focused on short-term goals of winning the next election to really consider the 20, 50, or 100 year perspectives that are required for environmental legislation. This inevitably means that the environment is low on the list of priorities for most ministers, and environmental policy is subject to undue influence by special interest groups. For example look at how easily Defra was persuaded to allow exceptions to the EU moratorium on neonicotinoid pesticides. Likewise the HS2 project which ministers seem determined to keep going despite serious concerns about the environmental impact of the project (see my post “Ordinary by Choice“).

When considering whether or not to vote to remain in the EU, most people (understandably) are focused on the social and economic arguments: the impacts on jobs, standards of living, resources for health, etc. But in part the environmental argument is a social and economic argument, because the natural environment underpins many jobs, our standards of living (who doesn’t want to live near unpolluted green space that is protected for future generations?), and plays an important part in the nation’s health and wellbeing. The provision of these “ecosystem services” were clearly spelled out last year in Tony Juniper’s book What Nature Does for Britain, which I reviewed on this blog.

I’m not arguing that everything in the European Union is perfect, or even that the environment of the UK and the rest of the EU is as good as it ought to be, or could be. But for every statistic about declining species and poor environments, it’s possible to quote figures for the success of other species and improvements in quality. For example our major rivers such as the Thames, Tees, Mersey and Avon are now swimming with fish where once they were swimming with excrement, as I’ve previously discussed in relation to the River Wear. Our membership of the European Union is, at least in part, responsible for these positive trends and I hope that they continue. Please consider this when you’re deciding how to vote on 23rd June.

Postscript: much of what I’ve discussed above is being widely talked about amongst environmentalists, and I don’t know of any major environmental organisation that is in favour of the UK leaving the EU. In fact a large number have publicly come out in favour of staying, including:

Chartered Institute of Ecology and Environmental Management

The Wildlife Trusts

Greenpeace

The RSPB and WWF-UK, who have produced a joint statement.

Friends of the Earth

Buglife

There is also a group called Environmentalists For Europe

So don’t just take my word for it.

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

A bee in a hurry, a plant at its leisure – for Biodiversity Day 2016

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Male B lap on Salvia cropped P1120309 Happy Biodiversity Day everyone! In celebration I thought I’d share with you my entry for this year’s University of Northampton Images of Research competition, the winners of which have just been announced (I wasn’t one of them, but congratulations to those who were).

Here’s the text I wrote to accompany the image:

Sometimes it’s difficult to photograph fast-moving bees, but this blurred image of a male Red-tailed Bumblebee (Bombus lapidarius) captures something of the essence of why plants use pollinators such as bees. Plants are static and cannot go searching for mates, so they sit and wait and use pollen vectors to move their male gametes to the flowers of other plants of the same species. Sometimes this involves wind or water currents; but for most plants this means using animal pollinators.

The bumblebee has been caught with its tongue extended, having just loaded up on nectar to fuel its search for virgin queen bumblebees with which to mate. The plant is a cultivated salvia variety growing in my garden: some of my research group’s work has involved studying pollinator diversity in urban and rural gardens, with a view to understanding the role of these artificial environments for conserving pollinators.

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.

Polinode – a user-friendly tool for visualising ecological networks

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Birds mixed flocks (2) - curved It is a general ecological rule that no species exists in isolation; all species interact with other organisms within the communities to which they belong. The collection and analysis of ecological interaction data has burgeoned over the past couple of decades, particularly in my own area of (largely) mutualistic species interactions such as plant-pollinator relationships – see for example this recent post on hummingbird-plant networks.

There are a number of software packages available for analysing and visualising this type of data, including bipartite and foodweb in R, Food Web Designer, and Gephi. Tools such as this vary in their flexibility and in the investment of time required to produce good quality graphics, and ultimately it’s down to personal preferences which you use.

Recently I discovered some very user-friendly network visualisation software that is browser/cloud based, free to use (at least the basic version), very flexible, intuitive and quick to learn. Ideal if you are pressed for time and want to generate some quick food webs.

The system is called Polinode and was developed primarily to visualise business and social science data (the “poli” part is nothing to do with pollination, that’s purely coincidental). However there’s no reason why it can’t be used for ecological data, as the image above demonstrates. This is a visualisation of mixed-species flocks of birds feeding together and alone on a local urban park that I’ve discussed previously. The thickness of the line is proportional to number of interactions observed, and the size of each node is proportional to the number of birds. Both are scalable in Polinode.

One could also present these data as a straight-line graph, without the loops to indicate single-species feeding:

Birds mixed flocks (5)

As well as these types of networks it’s also possible to produce bipartite (what Polinode terms “hierarchical”) graphs, for example this network of bumblebees feeding on different plant families in a British grassland (click for a closer view – I realised afterwards that I downloaded a rather small version):

Bombus hypnorum with plant families

The system is very flexible and nodes can be grabbed and moved around (as I did above to offset the plant family nodes), recoloured, resized, text resized, etc.

Polinode also calculates a range of network metrics such as degree and Louvain communities (a measure of modularity) which is more limited than some ecologists might require, but which is a good starting point for those new to ecological network statistics.

Data files can be uploaded directly from Excel, and there are example templates showing how to lay out the data. There is also ample online support including written guidance, videos, and a regular blog. Even in the few months I’ve been playing with the system the developers have added more features, including a graphing facility that generates column and scatter plots from your networks.

There you go, that’s an introduction to Polinode for ecologists; hope it’s useful for your work.

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.

The European Bee Course 2016

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.