Tag Archives: Bees

Links to some recent pollinator-related papers, posts, projects…. and pedals

oxalis-fly-p1030303

For weeks now I’ve been meaning to post some links to pollinator-related items that have caught my eye, but have only just found time to pull them together, hence some of these are a little dated but should still be of interest:

  • By pure coincidence Hazel Chapman (the senior author of that paper) came to Northampton a few weeks ago to give a seminar about her Nigerian Montane Forest Project which is well worth checking out and which, in the future, will have a large pollinator focus.
  • The Journal of Pollination Ecology (where I remain an editor) has a new volume out – it’s open access and has some really nice papers – here’s the link.
  • There’s been a few stories doing the rounds about robot pollinators and how they are going to replace insects.  It’s all nonsense, of course, and in a recent blog post Dave Goulson nails the arguments very well – see: Are robotic bees the future? [spoiler alert – the answer’s “No”].  Likewise, over on her blog, Manu Saunders opines that: “Artificial pollinators are cool, but not the solution“.  What the technologists who are promoting these ideas, and related concepts around the “Internet of Things”, don’t seem to get is that all of this tech has environmental costs associated with it: resource/pollution costs for making it; energy costs for using it; and disposal/pollution costs when it reaches the end of its life.  Applying a green wash of “let’s use drones for pollinating flowers” doesn’t make the tech any more environmentally sustainable, quite the opposite.  Sorry, rant over…
  • Ben Geslin and colleagues have written an interesting review in Advances in Ecological Research called “Massively Introduced Managed Species and Their Consequences for Plant–Pollinator Interactions” that focuses on both mass-flowering crop plants (e.g. oil seed rape) and domesticated, highly abundant pollinators such as honey bees, and what their increase might mean for natural communities of plants and pollinators, particularly in sensitive environments such as oceanic islands.
  • There’s a guitar effects pedal called the Pollinator – from the review:  “The Pollinator is a living thing, sensitive to its environment and surroundings, and it becomes an extension of the guitarist playing it.”  Quite.
  • Nine species of bee in the genus Perdita that are new to science have been described from localities in the the southwestern USA.  Here’s a link to a lovely video that shows these bees, their distinguishing features, and how they were named (mainly for characters from Shakespeare’s plays).  Not very impressed with the snarky “if scientists had bothered to look” title of the article though.
  • Finally, a new citizen science project has been launched designed to understand how hoverflies evolve mimicry of bees and wasps – looks interesting, please take part – here’s the link.  Just be aware, it’s a bit addictive!

As always, feel free to suggest links to items you found of interest.

Should scientists accept funding from agro-chemical companies? The devil’s in the details

Oxalis fly P1030303.png

The relationship between use of pesticides (particularly neonicotinoids) and the decline of pollinators is one that I’ve touched on a few times in this blog – see for example:  Bees and pesticides – a major new study just publishedButterflies and pesticides – a new study and a smoking gun; and Pesticides and pollinators: some new studies and contrasting conclusions.  It’s an important and controversial topic that’s unlikely to go away any time soon.  In an article in the New York Times, journalist Danny Hakim has given that particular pot a further stir by discussing Scientists Loved and Loathed by an Agrochemical Giant.

Although it’s been online since New Year’s Eve, the first I heard about the article was when an American colleague sent me a link this morning (the day it appeared in the printed version) and asked me if I had any thoughts and comments about one of the scientists featured – James Cresswell of the University of Exeter.  I’ve known and respected James for over 20 years and I think his contribution to this article provides a brave and open answer to the question I pose in the title of this post: should scientists accept funding from agro-chemical companies?

Please do read that article, it’s fascinating, if not entirely objective in its own right.  The tone and focus of the piece is best summed up by the one-sentence summary at the start, which incorporates a quote from Dave Goulson (University of Sussex):  “With corporate funding of research, “there’s no scientist who comes out of this unscathed””.  In fact that quote is taken rather out of context because Dave’s point was about perceptions of motives and biases, rather than actual corruption of the science and scientists concerned.

Having said that, the article does present a prima facie case that some scientists (though I emphasise not James himself) are playing fast-and-loose with the evidence related to pesticides and GM crops.

Back to perceptions.  Industry funding of university-led scientific research is incredibly common, far more common than the public probably realises.  There are three reasons for that.  First of all, universities are where many subject experts are based, of course.  Secondly, scientific research is expensive: it requires staff, facilities, equipment, funding for overheads, etc.  University researchers are therefore always hunting for money to enable them to carry out research (which in turn is linked to promotion success, career development, and so forth).  Thirdly, external income is an important performance indicator for universities and their constituent departments: James himself is quoted as saying “I was pressured enormously by my university to take that money”, a sentence that will resonate with many UK researchers.

In general the public’s perception (as far as I can tell) is that most of that research is not being corrupted by the industry funding that is attached to it.  In my own faculty at the University of Northampton, for instance, my colleagues have obtained industry funding for research and consultancy work in areas such as product design, lift engineering, materials science, leather processing, computer networks, app development, and so forth.  All controversy-free.

In much of the environmental sector that’s also the case: we’ve had funding from a large water utilities company to write a report on habitat management strategies for reducing rabbit densities close to water bodies, and one of my current research students is being funded by a solar farm company.  Likewise colleagues have been funded by wastes management companies to advise and research in that field.  None of this has generated any negative perceptions, with the possible exception of some aspects of wastes management where issues such as “waste-to-energy” remain controversial.

In other areas of environmental research, however, there have always been accusations of bias levelled at university researchers who are perceived to be industry shills, especially if they are not seen to be toeing a particular line.  I’m deliberately using that word – shill – because it’s something I was accused of being during a heated social media discussion of causes of pollinator declines.  A commenter claimed that I was an “industry shill” for daring to suggest that this was a complex topic, and that there were no easy answers to why (some) pollinators are declining, but that neonicotinoid pesticides were not the only cause.  “Which chemical company is funding your research?” she aggressively demanded to know.  I think I convinced her that I was not (and never have been) funded by chemical companies.  But it raised an interesting question: would I ever accept funding from such companies, if it was offered?

The simple answer is that I don’t know.  It depends what the money was for and what strings were attached in terms of non-disclosure, ownership of data, etc.  As the title of this post states, the devil’s in the details.  I know quite a number of researchers in my field who have had funding from Syngenta, Bayer, and other agro-chemical companies.  Some of these are colleagues with whom I have published research papers.  In general I have no reason to believe that the research conducted by any of these colleagues has been corrupted by their association with the funders.  However in one instance I had a disagreement with a colleague who was not (in my opinion) objective in how they wished to frame part of a paper’s discussion and who may (in my opinion) have been influenced by their association with a particular funder.  In the end this didn’t change the conclusions of the research (which was not itself industry funded) but it did make me pause to consider these subtle biases, which I’m sure could affect anyone*.  Again, perceptions are key here.

Money for the kind of research that’s done by colleagues and myself is always, always going to be in short supply and competitively pursued, and failure to obtain it will always be much more common than success.  Unless funding to address important ecological research questions from government (i.e. taxpayer money) and charities vastly increases, industry will be there to fund research in its own interests, and the perception of scientific bias will remain, whether or not it actually exists.

 

*I’m not prepared to say more about this particular example so please don’t ask.

Insect pollinators boost the market price of holly and mistletoe: a new study just published

Holly and mistletoe 20161211_103252.png

Each year I’ve always added at least one Christmas-themed biodiversity post to the blog, for example: Thank the insects for Christmas, A Christmas vignette, and Six Kingdoms for Christmas.  That’s partly because I really like Christmas as a winter festival, with its folklore and customs.  But it’s also because these are a great vehicle to demonstrate how pervasive and important is natural capital and the ecosystem services it provides to society.

This year I’ve gone one stage further and actually published some Christmassy research to back up the blog post.  Now, in a new study published in the Journal of Pollination Ecology, we have shown how important insect pollinators are in determining the market value of two of the most emblematic of Christmas plants: holly (Ilex aquifolium) and mistletoe (Viscum album).  Here’s the full reference with a link to the paper itself, which is open access:

Ollerton, J., Rouquette, J.R. & Breeze, T.D. (2016) Insect pollinators boost the market price of culturally important crops: holly, mistletoe and the spirit of Christmas. Journal of Pollination Ecology 19: 93-97

Holly and mistletoe are two seasonal crops that play a culturally important role as symbols of Christmas across the world, though both also have pre-Christian pagan roots. Now for the first time the role of insect pollinators in determining the commercial value of these plants has been investigated, using sales records going back over the last eleven years from Britain’s largest annual auction of holly and mistletoe, held every year in Worcestershire.

Analysis of the sales records of Nick Champion Auctions in Tenbury Wells shows that insect pollination raises the sale price of these crops by on average two to three times. This is because holly and mistletoe with berries is more sought after than material without berries, with wholesale buyers paying higher prices at auction. These berries in turn are the result of pollination by insects such as flies and bees: both holly and mistletoe are 100% dependent on insect pollination due to their having separate male and female plants.

There is some annual variation to the prices, and in years where berries are scarce (possibly due to low insect numbers) the price difference can be four-fold.

Due to concerns about pollinator declines and food security there is huge interest in the role of bees and other insects in supporting agriculture, and how we can value that role. However we believe that this is the first study showing that insect pollinators play a large part in determining the value of culturally symbolic, non-food crops. Almost all of the economic valuations of insect pollination to agriculture have focused on food crops such as beans, apples, cocoa, coffee, and so forth. Very little is known about how the value of non-food crops (fibres, construction materials, pharmaceuticals, ornamentals, etc.) is enhanced by insect pollination. This is an area where much more research is required.

But in the mean time, where better to end than with a bit of seasonal John Clare?

The shepherd, now no more afraid,
Since custom doth the chance bestow,
Starts up to kiss the giggling maid
Beneath the branch of mistletoe
That ‘neath each cottage beam is seen,
With pearl-like berries shining gay;
The shadow still of what hath been,
Which fashion yearly fades away.

The Shepherd’s Calendar (1827)

Recent developments in pollinator conservation: IPBES, 10 Policies, pesticide conspiracies, and more

Bee on apple blossom - 1st May 2015

It’s been a busy week for anyone interested in pollinators and their conservation, lots of things happening that I thought I would summarise in a single post with links.

First of all IPBES (the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services) has finally released the full text of its Thematic Assessment on Pollinators, Pollination and Food Production  – nine months after it was discussed at the 4th IPBES Plenary Meeting, and three months after the Summary for Policymakers came out.  Even now the document is not in its ultimate state, it’s the text without its final layout or appendices (though it still runs to 868 pages!)  The preamble to the report states that:  “A full laid out colour version, including a preface and annexes will be posted here shortly”.

Sources tell me that there have been some delays while the exact style and colour scheme of the report are finalised, which, if true, is frankly not very encouraging : this is an important document that needed to made public at the earliest opportunity.  I accept that it’s got to be correct, and it’s a complex report, and this is not a criticism of the authors, rather of IPBES’s bureaucracy.  Pollination ecology and pollinator conservation is a fast moving field and there have already been significant scientific and policy developments since the text was finalised which will not be incorporated into this version.

To coincide with the release of the report comes two important articles in the two most prestigious scientific journals by some of the authors of the report.  In “Ten Policies for Pollinators” (Dicks et al. Science 354: 975-976) the authors set out a series of recommendations for politicians.  The article is paywalled so here’s their list with some annotations [in square brackets]:

1. Raise pesticide regulatory standards [to include our most important pollinators – wild bees and other insects!]
2. Promote integrated pest management (IPM) [rather than automatically feeding the profits of agrochemical companies].
3. Include indirect and sublethal effects in GM crop risk assessments.
4. Regulate movement of managed pollinators [lots of evidence that poor husbandry is a major cause of colony collapse disorder, for example].
5. Develop incentives, such as insurance schemes, to help farmers benefit from ecosystem services instead of agrochemicals.
6. Recognize pollination as an agricultural input in extension services.
7. Support diversified farming systems [does Brexit provide an opportunity to do this in the UK?]
8. Conserve and restore “green infrastructure” (a network of habitats that pollinators can move between) in agricultural and urban landscapes [already lots being done on this in urban areas but much less in rural areas].
9. Develop long-term monitoring of pollinators and pollination [there’s already been a report on this – expect more news early next year].
10. Fund participatory research on improving yields in organic, diversified, and ecologically intensified farming.

Overall it’s a sensible set of recommendations – the only ones that I would have added would be to develop education and awareness programmes of the importance of natural capital and ecosystem services, aimed at farmers, civil servants, politicians, planners, business and industry, developers, etc.  And also to build consideration of natural capital into local planning systems so that the loss of habitats, trees, ponds, etc. are properly accounted for.  I’m sure others can think of more – feel free to comment.

Getting politicians to take notice of these recommendations in an age where scientific experts are derided as no different to “soothsayers and astrologers” will be a challenge though.

Lead author Lynn Dicks discussed these recommendations on the BBC Radio 4 Farming Today programme (from about 3:27) – well worth a listen.

Following on from this some of the authors of the 10 recommendations article were also involved in a review published this week entitled “Safeguarding pollinators and their values to human well-being” (Potts et al. Nature) – hopefully that link will take you to the full text of the article which is being widely circulated for free in a read-only form (it can’t be downloaded unless you have an e-subscription to Nature).

On the subject of safeguarding pollinators (and specifically from pesticides) a video of Dave Goulson speaking at the 2015 National Honey Show appears to have been edited to remove his comments about neonicotinoid pesticides (about 34:08 to 34:28).  Dave’s not sure if this is conspiracy or cock-up, but it’s an odd coincidence that this is the only glitch in an otherwise well-produced video.

At about 39:20 Dave talks about the importance of engaging kids with nature and specifically pollinators.  I completely agree and last week did a live Q&A phone interview with Year 7 pupils at Abbeyfield School in Northampton who are doing a project on bees.   The kids asked some great questions and were very well informed – a credit to their teachers!

This week there was a lot of pollinator and pollination ecology being discussed at the Ecological Society of Australia’s annual conference – Manu Saunders has produced a Storify to summarise the talks and Twitter comments – here’s the link.

Linked to this, against my better judgement and as an experiment, I’ve finally joined Twitter.  It’s a bit of an experiment to see how I get on and so far I’m enjoying it, though I’m sticking to science and environmental news – my handle is @JeffOllerton if you want to follow or tweet at me.

Managing for Pollinators – a special issue of the Natural Areas Journal

Inula at Ravensthorpe 20160710_145426The October issue of the Natural Areas Journal is a special one devoted to the topic of “Managing for Pollinators”.  All of the papers have a North American focus but I think that they will be of general interest to anyone, anywhere in the world, who is concerned with how best to manage habitats for pollinators.  Here’s the contents page of the issue, copied and pasted from the site; I’m not sure if the full text links will work if you or your institution does not have full text access, but you should at least be able to view the abstracts:

Editorial: Pollinators are in Our Nature Full Access

Introduction by USFS Chief Tidwell – Pollinators and Pollination open access

pg(s) 361–361

Citation : Full Text : PDF (227 KB)

National Seed Strategy: Restoring Pollinator Habitat Begins with the Right Seed in the Right Place at the Right Time Full Access

Peggy Olwell and Lindsey Riibe
pg(s) 363–365

Citation : Full Text : PDF (1479 KB)

Hummingbird Conservation in Mexico: The Natural Protected Areas System Full Access

M.C. Arizmendi, H. Berlanga, C. Rodríguez-Flores, V. Vargas-Canales, L. Montes-Leyva and R. Lira
pg(s) 366–376

Abstract & References : Full Text : PDF (1302 KB)

Floral Guilds of Bees in Sagebrush Steppe: Comparing Bee Usage of Wildflowers Available for Postfire Restoration Full Access

James H. Cane and Byron Love
pg(s) 377–391

Abstract & References : Full Text : PDF (1500 KB)

The Role of Floral Density in Determining Bee Foraging Behavior: A Natural Experiment Full Access

Bethanne Bruninga-Socolar, Elizabeth E. Crone and Rachael Winfree
pg(s) 392–399

Abstract & References : Full Text : PDF (1219 KB)

Common Methods for Tallgrass Prairie Restoration and Their Potential Effects on Bee Diversity Full Access

Alexandra Harmon-Threatt and Kristen Chin
pg(s) 400–411

Abstract & References : Full Text : PDF (300 KB)

Status, Threats and Conservation Recommendations for Wild Bumble Bees (Bombus spp.) in Ontario, Canada: A Review for Policymakers and Practitioners Full Access

Sheila R. Colla
pg(s) 412–426

Abstract & References : Full Text : PDF (420 KB)

Conserving Pollinators in North American Forests: A Review Full Access

James L. Hanula, Michael D. Ulyshen and Scott Horn
pg(s) 427–439

Abstract & References : Full Text : PDF (1711 KB)

Dispersal Limitation, Climate Change, and Practical Tools for Butterfly Conservation in Intensively Used Landscapes Full Access

Laura E. Coristine, Peter Soroye, Rosana Nobre Soares, Cassandra Robillard and Jeremy T. Kerr
pg(s) 440–452

Abstract & References : Full Text : PDF (4647 KB) : Supplementary Materials

Revised State Wildlife Action Plans Offer New Opportunities for Pollinator Conservation in the USA Full Access

Jonathan R. Mawdsley and Mark Humpert
pg(s) 453–457

Abstract & References : Full Text : PDF (249 KB)

Diet Overlap of Mammalian Herbivores and Native Bees: Implications for Managing Co-occurring Grazers and Pollinators Full Access

Sandra J. DeBano, Samantha M. Roof, Mary M. Rowland and Lauren A. Smith
pg(s) 458–477

Abstract & References : Full Text : PDF (1537 KB)

The Role of Honey Bees as Pollinators in Natural Areas Full Access

Clare E. Aslan, Christina T. Liang, Ben Galindo, Hill Kimberly and Walter Topete
pg(s) 478–488

Abstract & References : Full Text : PDF (467 KB)

Food Chain Restoration for Pollinators: Regional Habitat Recovery Strategies Involving Protected Areas of the Southwest Full Access

Steve Buckley and Gary Paul Nabhan
pg(s) 489–497

Abstract & References : Full Text : PDF (732 KB)

Forbs: Foundation for Restoration of Monarch Butterflies, other Pollinators, and Greater Sage-Grouse in the Western United States Full Access

R. Kasten Dumroese, Tara Luna, Jeremiah R. Pinto and Thomas D. Landis
pg(s) 499–511

Abstract & References : Full Text : PDF (1716 KB)

Using Pollinator Seed Mixes in Landscape Restoration Boosts Bee Visitation and Reproduction in the Rare Local Endemic Santa Susana Tarweed,Deinandra minthornii Full Access

Mary B. Galea, Victoria Wojcik and Christopher Dunn
pg(s) 512–522

Abstract & References : Full Text : PDF (2880 KB)

Save Our Bats, Save Our Tequila: Industry and Science Join Forces to Help Bats and Agaves Full Access

Roberto-Emiliano Trejo-Salazar, Luis E. Eguiarte, David Suro-Piñera and Rodrigo A. Medellin
pg(s) 523–530

Abstract & References : Full Text : PDF (463 KB)

The Importance of Phenological Diversity in Seed Mixes for Pollinator Restoration Full Access

Kayri Havens and Pati Vitt
pg(s) 531–537

Abstract & References : Full Text : PDF (2208 KB) : Supplementary Materials

Stewardship in Action Full Access

Sarah Riehl
pg(s) 538–541

Citation : Full Text : PDF (595 KB)

Bumblebees, ferries, and mass migrations: an update

Sejero - 20160910_113537.png

The post earlier this week on the question of “Why do bumblebees follow ferries?” generated quite a few comments, both on the blog and on Facebook.  As I’d hoped a number of people have chimed in to say that they have observed the same thing, or commented that they often see bumblebees when sailing or kayaking out at sea.

Here are the additional observations in increasing distance order to nearest larger area of land.  Distances are approximate and in some cases it’s unclear where exactly the observations were made:

Isle of Mull to the Isle of Staffa: 6.5km

Skye and the Outer Hebrides going in both directions: 24km

Ferry to Jersey: 28.4km

Estonia to Helsinki: 80km – described in a short paper by Mikkola (1984).

However this is nothing compared to evidence that queen bumblebees may engage in mass migrations (involving thousands of bees) across the North Sea from England to Holland, a distance of 165km!  See Will Hawkes’s short article “Flight of the Bumblebee“.

This idea of mass migration is new to me, though the Mikkola (1984) paper cites some earlier literature on the topic.  And this morning I had a quick phone chat with Dave Goulson who tells me that he occasionally gets people contacting him to tell him about such events.  But it’s unclear why these bees should be flying such large distances, how they coordinate their migrations, or indeed how much energy they need to store to travel that far. In addition there are implications for gene flow between British and Continental subspecies of bees such as the Buff-tailed Bumblebee (Bombus terrestris). Even a relatively well studied group of insects such as the bumblebees can continue to surprise us with new questions!

Thanks to everyone who contributed observations and ideas, it’s much appreciated.

Why do bumblebees follow ferries?

Sejero - 20160910_180359.png

A few years ago I mentioned in my post “Garlicky archipelago” that I had seen bumblebees (Bombus spp.) following the ferry from Southampton to the Isle of Wight, a distance of about 1.5km across water.  If I remember correctly it was my colleague Scott Armbruster who first mentioned this to me: he lives on the Isle of Wight and commutes regularly to the mainland.

I’ve not thought much about this since then as 1.5km is a fairly modest distance for a bumblebee to fly.  But then a few weeks ago I saw the same thing in Denmark, but this time over a much longer distance.

Karin and I were visiting friends on the small island of Sejerø, which (at its closest point) is about 8km from the mainland of Zealand.  To get there you have to catch a ferry which takes about an hour to cross this stretch of water.  About half-way across,  whilst looking over the stern of the ship, I spotted a bumblebee following the ferry.

So that’s twice, on two different ferries and under very different contexts, that I’ve seen this phenomenon.  A pattern is starting to form….  Has anyone else observed this?  Please do comment.

I can think of a few explanations/hypotheses for what’s going on here (some of which are not mutually exclusive):

  1.  Clearly bumblebees do fly across significant stretches of open seawater.  Perhaps all I’m seeing is bees that do this, but spotted from the only vantage point where it’s viewable (i.e. the ferry).
  2. These bumblebees are taking advantage of the slipstream created by the ferry to reduce the energy required to fly these long distances.
  3. The bees are hitching a lift on the ferry and I only observe them as they arrive or depart.
  4. The bees are following the wake of the ship to navigate between the island and the mainland, in order to exploit significant flower patches.  Work by one of my PhD students, Louise Cranmer, a few years ago showed that bumblebees follow linear features such as non-flowering hedgerows to navigate – see Cranmer et al. (2012) Oikos.  Perhaps something similar is happening here?

There’s probably other possibilities I’ve not thought of.  But whatever the explanation, it looks to me as if there’s some potential for interesting experiments marking and recapturing bees on islands/mainland, releasing bees on ferries to see if they follow the wake, etc.  If only Northampton wasn’t so far from the coast….

 

 

Two-day Steven Falk bee ID course at Oxford University Museum 15th-16th October 2016

Male B lap on Salvia cropped P1120309

One of the most exciting, pollinator-related publishing events of last year was the publication of Steven Falk’s eagerly-anticipated Field Guide to the Bees of Britain and Ireland.  Not only does this book provide a state-of-the art account of the natural history and identification keys for all of the bees currently known from Britain (over 270 species) but it’s backed up by Steven’s own Flikr site with more photographs of the bees, including lots of close ups, and an ongoing list of updates and corrections.

But as Steven himself acknowledges, the identification of many of our bees is a challenge, even with the book and the additional imagery.  Anyone who is really keen to get to grips with bee identification is therefore recommended to book onto a hands-on identification course.  Steven has just announced that he is running a two-day course in Oxford on 15th to 16th October, at a cost of £60 per person – here’s a link to the booking page.  Seems like good value to me!

Bees and pesticides – a major new study just published – UPDATED

Male B lap on Salvia cropped P1120309

An important new study about the effects of neonicotinoid pesticides on wild bees has just been published in the journal Nature Communications – here’s the details and a link to the paper, which is open access:

Woodcock, B. A. et al. (2016) Impacts of neonicotinoid use on long-term population changes in wild bees in England. Nat. Commun. 7:12459 doi: 10.1038/ncomms12459

As I’ve previously discussed on this blog (e.g. here and here) there are widespread concerns amongst environmentalists, and some scientists, about the impact that these relatively new pesticides are having on pollinators and other biodiversity.  The Woodcock et al. paper is a major contribution to this discussion as it uses a huge dataset to model the changes in populations of 62 wild bee species that are known to forage on oilseed rape (canola) over 18 years.  These changes can be related to the spatial extent of oilseed rape cultivation and the authors found that whilst bees “….foraging on oilseed rape benefit from the…[nectar and pollen provided by]….this crop….[they]….were on average three times more negatively affected by exposure to neonicotinoids than…” bees which didn’t forage on the crop.

The authors further conclude that “This study provides the first evidence for community level national scale impacts on the persistence of wild bee populations resulting from exposure to neonicotinoid treated oilseed rape crops.”

Neonicotinoid pesticides are, of course, not the whole story when it comes to understanding declines in pollinator diversity and abundance.  But these pesticides are the latest in a long history of changes to British agriculture that have had significant consequences for the biodiversity of our country (as we showed in our study of bee and wasp extinctions).

Reactions to the study have been, well, predictable.  A long feature on the BBC News website* quoted a representative from Bayer as saying:

“we believe….[the study’s]….findings would be more correctly headlined that intensive agriculture is causing some issues with pollinators…..  Whether this is due to the use of insecticides is not clear; a lack of nesting sites and pollen and nectar sources in these areas may also be critical factors.”

Which rather ignores the fact that this was a comparative study of bees that forage on oilseed rape versus those that don’t.

Likewise the National Farmer’s Union’s position was that:

“While this study claims to provide an important contribution to the evidence base underpinning the current EU moratorium on some uses of neonicotinoids, experts reviewing all the evidence have concluded that there are still major gaps in our knowledge and a limited evidence base to guide policymakers”

Which sounds to me like a statement designed to fudge the issue: the “experts reviewing all the evidence” would not have reviewed this particular study!  And which begs the question – how much evidence and how many studies would be enough for the NFU?

The study’s authors do not make any suggestions as to what the next step should be in this continuing saga but are quoted as saying that “simplistic solutions” such as banning these pesticides are not the answer because this will encourage use of pesticides that are even more damaging.  That may be the case but it’s clear that an independent root-and-branch reassessment of the use of pesticides (and herbicides) in UK agriculture is long overdue.

 

*As an aside, this BBC News piece wrongly states that bumblebees were not included in the study, which is not the case.

 

UPDATE:  After I published this post I noticed that Manu Saunders has also written about the bee study, plus a second study that I’d not seen linking neonicotinoid use to declining butterfly populations in California.  Here’s a link to Manu’s blog.

 

Just published: A horizon scan of future threats and opportunities for pollinators and pollination

A team of pollinator researchers from across the globe has just published an interesting new paper which looks at potential threats to pollinators and the pollination services that they provide, as well as opportunities for future conservation and agricultural gains.  The paper is open-access and free to download – here’s the reference and a link to the paper:

Brown, MJF et al. (2016) A horizon scan of future threats and opportunities for pollinators and pollination.  PeerJ

The paper has also gained some media coverage, e.g. on the BBC News website.