Bumblebee queens, where do they rest?

March 24, 2012

in Bumblebees and their ecology, Gardening For Wildlife

Bumblebee queens, where do they rest?

Updated. I have seen several bumblebee queens recently (Feb 2016) and none of them were in nest seeking mode! I am convinced that after emerging from hibernation it can take quite a while before they are actually fit to start a nest. Weather, temperature and available forage will greatly determine this activity.

After my article bumblebee queens where do they nest? I thought I would write another aspect of bumblebee ecology… resting! When queen bumblebees awake from hibernation, the first thing on their mind is to feed up and replenish their fat reserves, now exhausted by the hibernation process. The early morning and early afternoon is spent replenishing their fat reserves. Sladen mentions that by afternoon, as the sun descends and the air grows chilly, the queens find hiding places and relapse into a semi-torpor until a favourable day rouses them into activity again. As the season progresses, the activity increases and the semi-torpor decreases.

Where do the bumblebee queens rest mid afternoon?

With this in mind, I went for a short stroll near by to where I live. It forms part of my bumblebee walk for the Bumblebee Conservation Trust. In the past, I often saw queen bumblebees showing nest searching tendencies, but from later observations in exactly the same area, I have not, to date, found any established bumblebee nests in 3 years of living here. I knew the area was sheltered, received sunshine all day and would be ideal I thought, for bumblebees to rest in. Yesterday 22 March 2012 , I went outside to the area I usually observed the queens. I saw lots of them just resting on the grass surface, just hidden in grass tufts or just under leaves. Today 23 March 2012 had similar weather. Both were lovely days, warm, no wind, sunny with blue skies and dare I say it, rather summery.

Bumblebee queens are any resting mid afternoon as Sladen suggests they do?

All photographs taken on the day and time in question, with an iPhone 4s.  Total species shown below.

Bumblebee queens are they resting here?

From 1440 hrs to 1540 hrs I went for a stroll along the area, a piece of parkland measuring about 125 m in length, which forms part of a much larger area.

The length I was observing runs in a long an east-west corridor and faces south. The area was receiving full sun and does for most of the day.

Bumblebee queens where do they rest-edge of the area I was observing

The opposite side of my observation area was shaded and I did not se one bumblebee resting there.

Bumblebee queen B. hypnorum resting behind grass on tree trunk

She was too quick for me though and as soon as I moved nearer to get a shot, she was off!

Bumblebee queen having a siesta amongst the dead leaves

It is known that bumblebee queens bury themselves beneath vegetation to avoid the dangers of frost. These queens, some of which were found on top of dead leaves may spend the night underneath these leaves. Others on the grass banks may have to move to the dead leaves to bury beneath.

Bumblebee queen resting before the arduous nest building duties begin

Queens need huge amounts of protein in the form of pollen and unfortunately this particular area does not have much at this time of the year, just a few willow trees for pollen and very few primroses for nectar, many of which were planted by the Friends of Gorse Covert Mounds .

Bumblebee queen resting

 

Bumblebee queen resting

 

Bumblebee queen resting

Alford states that bumblebee queens spend time flying, foraging and……sunning themselves on vegetation! He was right!

Bumblebee queens-there are two near each other in this picture can you find them?

 

Bumblebee queen resting in tall dead grass

This apparent life of luxury will not last too long. The important tasks of nest site searching, nest building and colony establishment is not too far away now.

Bumblebee queen at rest amongst dead leaves

 

Bumblebee queen resting on top of dead leaves with a spider at rest to her right!

 

Bumblebee queen resting on grassy bank

 

Bumblebee queen resting on newly cut grassy bank

 

Bumblebee queen. B.lapidarius at rest on recently cut grass

I found most of the B.lapidarius at rest on a recently mown grassy bank. Bumblebees I have seen like to bury themselves under small piles of the partially dried grass.

Bumblebee queen was at rest till I disturbed her and she flew off

You do have to approach quietly. I broke a twig as I stood on it about 12 cms from a slumbering queen. The snap which was loud, caused her to jump slightly, her wings crossed over each other, then a little movement, followed by vibrating of her wings and a clumsy take off ensued. I do not know if they can hear but she certainly was spooked, as many were as I approached them and got quite close to them. This one I managed to photograph just as I disturbed her, many more I did n’t and off they flew.

Bumblebee queen at rest-but where is she?…see next photo!

 

Bumblebee queen at rest-did you spot her in above photo?

 

Bumblebee queen, B. lapidarius at rest

 

Bumblebee queen at rest on grassy bank- dead, one of two I found

To be honest, there were far more that I disturbed and was unable to photograph than I could photograph!

All in all I found 17 B. terrestris/lucorum,  7 B. lapidarius, 2 Bpratorum and just 1 B. hypnorum

I have only see two queens in my nearby garden this year to date and no wonder as they are all snoozing nearby! Though as I did not see any with pollen on their rear legs, this implies that those I saw had not yet replenished their fat reserves, nor had set up a nest sites.

See my new Registered Design award winning solitary bee box and bumblebee nest box both of which are radical, practical and educational, offering them a safer nesting environment in which you can observe the bees. Great for schools!

For more information about solitary bees and wasps visit BWARS

For more bumblebee information and to help save bumblebees join the Bumblebee Conservation Trust at Stirling University

Refs: Besides my own observations, photographs and experiences;

Alford, D.V.(1975) “Bumblebees”, Davis-Poynter Ltd.

Sladen, F.W.L. (1912) “the Humble-Bee” Macmillan & Co.Ltd

 

 

 

 

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