Category Archives: Bees

“I want to see the bright lights tonight” – the 30th annual SCAPE conference part 1

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The 30th annual Scandinavian Association for Pollination Ecology (SCAPE) meeting is taking place at its northern-most, and most remote, venue. We are at Abisko in Sweden, 68O N and 195km inside the Arctic Circle. It’s not too cold at the moment, but there is ice starting to form on the many lakes in the area, and the trees are leafless. It’s a stunning, sparse location for the conference.

About 75 of us have gathered to hear a wide range of talks on all matters related to pollinators and pollination. The programme kicked off at 1925 on Thursday evening when five participants discovered that they were speaking in the first session after a hard day of travelling. I’d been awake since 0330 that morning so was not as receptive to the science as I should have been… Yesterday was much better, in that I was more awake, but it was still quite an intensive day that culminated in my own talk on spatio-temporal stability in a plant-pollinator interaction on Tenerife.  Being last speaker in a session is a mixed blessing and needs a good story to keep people awake.  But I’m not best able to judge if I succeeded.

The quality of the science, and of the presentations, has so far been very good. Here’s a selection of just a few other things I’ve learned or that have intrigued me during the first half of the conference:

Individual pollen grains can be stained a variety of fluorescent colours by a new marking technique involving “quantum dots” (Bruce Anderson)

We are still a long way from understanding all of the subtle ecological and behavioural effects of neonicotinoid pesticides on pollinators and pollinations (Juho Lämsä and Dara Stanley)

There are serious prospects of us being able to track individual pollinators across landscapes using drones (Tonya Lander)

Active “stigma rubbing” by anthers to promote self pollination has been documented for using time-lapse photography (Mohamed Abdelaziz)

The outcomes of competition for pollinations and reproductive interference between co-flowering plant species are complex and certainly not always predictable (Sharon Strauss and James Rodger)

The title of this post refers to a great song by Richard and Linda Thompson called “I want to see the bright lights tonight” and reflects everyone’s desire over to see the aurora borealis during this meeting. We had a brief encounter with the northern lights on Thursday evening, but they were pale and obscured by clouds. Perhaps tonight will be brighter. Before that we have another full day of talks to look forward to, and I’ll try to report back before we leave tomorrow.  For now, breakfast is calling.

Ivy pollinators citizen science project

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Today, finally, after several years of hunting for them in Northamptonshire, I got to see some Ivy Bees (Colletes hederae) and managed to get a couple of decent photos.  The Ivy Bee is a recent natural colonist to the British Isles, having arrived here in 2001.  The Bees, Wasps and Ants Recording Society (BWARS) is running an Ivy Bee Mapping Project and you can find out more details by following that link.

The bees we saw today were a few minutes walk from the University and were (it’s galling to admit) discovered by Fergus Chadwick, a keen young ecologist who is working with me for a couple of months to gain some postgraduate research experience.

The main thing that Fergus is going to work on is a Pollinators of Ivy Monitoring Project.  Follow that link and it will give you details of how you can provide us with data to better understand the pollination ecology of one of our most ecologically valuable and under-rated plants.  Ivy (Hedera helix) is a hugely important nectar source to a wide range of over wintering bees, flies, beetles, hoverflies, wasps, and other insects.  Not only that but its berries are a vital food source for many fruit eating birds.  Any and all help in this project is very much appreciated!

Bumblebees, ferries, and mass migrations: an update

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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?

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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….

 

 

Urban areas as a refuge for insect pollinators: conservation for the city

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Urban conservation ecology is a fast growing field that has mainly focused on how towns and cities can support populations of plants, animals and fungi that may be declining or threatened in the surrounding rural environment.  That is, the city for wildlife conservation.  In a new essay in the journal Conservation Biology, written with colleagues from across the world, we argue that conservation for the city (an idea originally conceived, I believe, by Steward Pickett) should also be a focus of future research and management activities.

Conservation, or ecology, for the city in essence means that plants, animals and fungi, as well as being supported by the city (see our recent urban bees example), play a role in supporting the city itself through the provision of ecosystem services such as decomposition, flood alleviation, and crop pollination.

It’s pollinators and pollination that we particualrly focus on in this essay – here’s the abstract:

Urban ecology research is changing how we view the biological value and ecological importance of cities. Lagging behind this revised image of the city are natural resource management agencies’ urban conservation programs that historically have invested in education and outreach rather than programs designed to achieve high-priority species conservation results. This essay synthesizes research on urban bee species diversity and abundance to suggest how urban conservation can be repositioned to better align with a newly unfolding image of urban landscapes. We argue that pollinators put high-priority and high-impact urban conservation within reach. In a rapidly urbanizing world, transforming how environmental managers view the city can improve citizen engagement while exploring more sustainable practices of urbanization.

I’m happy to send the PDF to anyone who wants a copy; here’s the full citation:

 

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

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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!

Release today of the IPBES Summary for Policymakers of the Assessment Report on Pollinators, Pollination and Food Production

Inula at Ravensthorpe 20160710_145426Following on from the press release earlier this year announcing of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) assessment of pollinators, pollination and food production (which I reported on in February) it looks as though the full report may shortly be published.  A Summary for Policymakers has just been released by IPBES and can be downloaded by following this link.  I’ll put up a link to the full report once it becomes becomes available.

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

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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.

 

Identifying the “Wild Bees” in John Clare’s poem – UPDATED

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John Clare is one of the most celebrated English poets of rural landscapes and nature in the 19th century. To quote his biographer, Clare was “the greatest labouring-class poet that England has ever produced. No one has ever written more powerfully of nature”.  Not only that, he was born and lived for much of his life in my adopted county, hence his epithet as “The Northamptonshire Peasant Poet”.

One of his less well-known poems is called Wild Bees and is a stunning example of Clare’s ability to make detailed observations of the natural world and to translate those observations into poetry.  So good are those observations that, as I show below, it’s possible to identify Clare’s bees from the descriptions he gives.  First of all, here’s the full poem:

Wild Bees

These children of the sun which summer brings
As pastoral minstrels in her merry train
Pipe rustic ballads upon busy wings
And glad the cotters’ quiet toils again.
The white-nosed bee that bores its little hole
In mortared walls and pipes its symphonies,
And never absent couzen, black as coal,
That Indian-like bepaints its little thighs,
With white and red bedight for holiday,
Right earlily a-morn do pipe and play
And with their legs stroke slumber from their eyes.
And aye so fond they of their singing seem
That in their holes abed at close of day
They still keep piping in their honey dreams,
And larger ones that thrum on ruder pipe
Round the sweet smelling closen and rich woods
Where tawny white and red flush clover buds
Shine bonnily and bean fields blossom ripe,
Shed dainty perfumes and give honey food
To these sweet poets of the summer fields;
Me much delighting as I stroll along
The narrow path that hay laid meadow yields,
Catching the windings of their wandering song.
The black and yellow bumble first on wing
To buzz among the sallow’s early flowers,
Hiding its nest in holes from fickle spring
Who stints his rambles with her frequent showers;
And one that may for wiser piper pass,
In livery dress half sables and half red,
Who laps a moss ball in the meadow grass
And hoards her stores when April showers have fled;
And russet commoner who knows the face
Of every blossom that the meadow brings,
Starting the traveller to a quicker pace
By threatening round his head in many rings:
These sweeten summer in their happy glee
By giving for her honey melody.

 

Here are the bees that I think Clare is talking about:

The white-nosed bee that bores its little hole, In mortared walls and pipes its symphonies

This is the least obvious of the bees to identify, but my best guess, due to the “little hole” and “white nose“, is one of the small Yellow-Faced Bees (Hylaeus spp.) some of which (despite the name) have white faces.  UPDATE:  following discussion with Matt Smith in the comments (below) I’m going to change my mind and suggest that Clare is referring to male Hairy-footed Flower Bee (Anthophora plumipes) – I think the “never absent couzen” part is the give-away.

And never absent couzen, black as coal, That Indian-like bepaints its little thighs

This has to be the female Hairy-footed Flower Bee (Anthophora plumipes) which is all black except for its orange pollen brush on its rear legs, and which also nests in old walls.

The black and yellow bumble first on wing, To buzz among the sallow’s early flowers, Hiding its nest in holes from fickle spring

I’m going to suggest that this is referring to the Buff-tailed Bumblebee (Bombus terrestris), the queens of which tend to emerge earlier than other, similar species, hence “first on wing“.  It also usually nests in rodent holes.

In livery dress half sables and half red, Who laps a moss ball in the meadow grass

This can only be the Red-shanked Carder Bee (Bombus ruderarius) the only red and black bee in the UK that makes a mossy nest above ground.

And russet commoner who knows the face, Of every blossom that the meadow brings

Finally, this must be one of my favourite bumblebees, the all-brown, Common Carder Bee (Bombus pascuorum), which is as common as the name suggests, and is renowned for foraging on a wider range of flowers than most others, and therefore “knows the face of every blossom“.

If you have any suggestions for alternative bee identifications, please comment below.

UPDATE:  it occurred to me after I posted this that all of the bees that Clare describes are still common in Northamptonshire with the exception of the Red-shanked Carder Bee (Bombus ruderarius) which has seen a huge decline throughout its range – see the BWARS account for this species.

 

 

 

 

 

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.