Bombus distinguendus, the great yellow bumblebee.
gailhampshire, CC BY 2.0, via Wikimedia Commons

The great yellow bumblebee is one of the most striking and most threatened bumblebees in Britain. Entirely sandy-yellow except for a broad black band across the top of the thorax between the wing bases and black patches below them, Bombus distinguendus Morawitz, 1869 is unmistakable when seen well. It was once widespread across Britain and Ireland; it is now confined to Orkney, the Outer Hebrides, the north Highlands coast, and a handful of other northern and western Scottish sites. Its last Irish population survives in north-west Ireland, where it is classified as Endangered. It is a Priority species under the UK Biodiversity Action Plan, a Species on the Edge priority in four Scottish regions, and the subject of active conservation work by the Bumblebee Conservation Trust and Plantlife. Queens forage in overcast conditions less readily than most other bumblebees, making it particularly vulnerable to the cool, cloudy summers that are already becoming more frequent at northern latitudes. Explore its surviving range on the UK Native Bee Species Map or read about bumblebees worldwide in the World Bee Atlas.

Taxonomy and Classification

The great yellow bumblebee was described by Franz Morawitz in 1869. It belongs to the subgenus Subterraneobombus, which contains bumblebees with a predominantly northern Palearctic distribution. The species has a wide range across central and northern Europe from Britain east to Sakhalin, but has declined severely at the western and southern edges of its range, including Britain and Ireland, while remaining more common in parts of Scandinavia and central Europe.^[1]

The species name distinguendus is Latin for "distinguished" or "remarkable," a reference to its striking all-yellow colouration. It was described from continental material and recognised as occurring in Britain on the basis of specimens collected in the nineteenth century. BWARS notes a complex synonymy including Apis nemorum Fabricius 1775 (not of Scopoli) and Bombus elegans Seidl, 1837.^[1]

Identification

The great yellow bumblebee is one of Britain's most distinctive bumblebees and, in its remaining range, one of the least confusable. All three castes are sandy or golden-yellow across the entire body, broken only by a broad band of black hairs on the top of the thorax between the wing bases (the inter-alar band) and black patches at the sides of the thorax below the wing bases. There is no white tail, no red tail, and no yellow-and-black banding of the type seen in most other bumblebees.^[2]

Queens average around 18 to 20 mm and have a neat, dense coat described as "lapidarius-sized" in field guides, referring to their similarity in body size to red-tailed bumblebee queens, though the colouration is entirely different. Workers and males have somewhat longer, more loosely arranged hairs and appear slightly scruffier than queens. The face is relatively long, consistent with the long-tongued foraging the species practises. The principal confusion risk is with faded or worn carder bees (B. muscorum, B. humilis, B. pascuorum) whose ginger coats can bleach to a yellowish hue in worn specimens, and with male field cuckoo bees (B. campestris) which have a shorter face and lack pollen baskets.^[2]

Distribution: A Catastrophic Retreat

The great yellow bumblebee was formerly widespread across Britain, with historical records from much of England, Wales, Scotland and Ireland, though with a northern and western bias even in the nineteenth century. By 1999 it had contracted to the Inner and Outer Hebrides, Orkney, and the north coast of mainland Scotland, with an older Shetland record unconfirmed in modern surveys.^[1]

Current strongholds are the machair grasslands of the Outer Hebrides, where it remains locally common, and Orkney. On the Scottish mainland it persists in small numbers along the north Highlands coast between Cape Wrath and John o'Groats, and in Argyll. The Bumblebee Conservation Trust's Species on the Edge project works across four regions: Orkney, North Highlands Coast, Argyll Coast and Inner Hebrides, and Outer Hebrides. In Ireland, the last known population is in north-west Ireland and is classified as Endangered on the Irish Red List.^[3]

Machair: The Habitat That Sustains It

The great yellow bumblebee is most abundant on machair, the shell-sand coastal grassland of north-west Scotland and western Ireland that supports some of the most flower-rich plant communities in Europe. Machair managed under traditional low-intensity crofting systems provides the dense stands of legumes, particularly bird's-foot trefoil, red and white clover, and kidney vetch, that the species requires for a successful colony cycle.^[2]

BWARS notes that the species requires large expanses of natural and semi-natural grassland with high densities of flowering legumes, alongside stands of knapweed and areas of tussocky grass for nesting. The combination of these requirements means that fragmented or degraded machair is significantly less suitable even if individual plant species are still present. Agricultural intensification, reseeding, overgrazing and drainage have eliminated this combination across most of the species' former range.

Foraging: Sunshine-Dependent and Long-Tongued

Queens emerge in late May and June and forage initially on bird's-foot trefoil, kidney vetch and white clover before switching to red clover as it becomes available. Workers, which appear from mid-July onwards, forage heavily on clovers and knapweed. The species persists until early September, visiting devil's-bit scabious as one of the last foraging plants of the season.^[2]

A distinctive and ecologically important trait is its sensitivity to weather. Unlike the closely related moss carder bee, which forages readily in overcast conditions, the great yellow bumblebee forages at much reduced rates when the sun is obscured, even in otherwise suitable weather. This means that colony foraging time is compressed on cloudy days, making it more vulnerable than other species to the cool, cloudy summers increasingly typical of Atlantic Scotland.^[2]

Upland Scotland and Our Heather Honey

The great yellow bumblebee and our Yorkshire Heather Honey share an ecological moment: late summer in northern British uplands, where the last flowers of the season carry the greatest ecological weight. The bee forages on devil's-bit scabious and knapweed in September on the same northern grassland landscapes where our honeybee colonies work heather in August. Different landscapes, same season, same dependence on what the land produces in its final weeks of flower.

Our Heather Honey is gathered from the Yorkshire Moors: bold, thixotropic, gathered in a single annual harvest. For a gift that spans the range of what British and Transylvanian beekeeping produces together, the British Honey Bundle brings Wildflower, Soft Set and Heather into one box.

From our range

Yorkshire Moors • Single annual harvest

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Bold, thixotropic and distinctive. Raw Yorkshire heather honey gathered from late-summer upland moorland, the same season the great yellow bumblebee makes its final foraging push. One harvest, one season. 280g.

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Written by

Dragos Nistor

Founder, HoneyBee & Co. • Guest Lecturer, University of Greenwich

Dragos comes from six generations of beekeeping in Transylvania, Romania. The Nistor family apiaries, managed by Fanel and Grigore Nistor, produce the raw single-origin honeys at the heart of HoneyBee & Co. Dragos founded the brand to bring that heritage to the UK, and lectures on food entrepreneurship at the University of Greenwich. Our British honey supplier holds SALSA Certification. NHS Discount available.