One of my tasks as a conservation intern at Brockholes Nature Reserve over the winter was helping to clear the vegetation from the sandy banks, which are used as nesting sites by mining bees. Brockholes is next to the river Ribble, whose shifts of course since its valley was carved by a glacier during the Ice Age, have laid down sandy deposits (although most of the sand and gravel was quarried over a decade ago some remains).
These sandy banks are the perfect homes for mining bees (Andrena species). It is little known that, in Britain, of over 270 species of bee, there is only one species of honey bee, 24 species of bumblebee and around 250 species of solitary bees. 65 of the latter are mining bees. They make homes for their young in soil, sand, or clay, and can be found on river banks, road and railway embankments, cliff faces, garden lawns, allotments, open woodlands, and moorlands.
During their brief life-span of four to six weeks, in spring and summer, female mining bees gather pollen on their hind legs and take it to where they have excavated their nests. They dig a tunnel to a chamber, add pollen to strengthen the walls, lay an egg, seal it shut, and move on to the next. Once laying is complete they perish. The only function of the males is to mate with the females, after which they die. The larvae over-winter in the chambers and emerge in the spring to restart the cycle.
One of the most common species is the ashy mining bee (Andrena cineraria). TheLatin term cinerarius means‘of ashes’ and refers to the broad ash grey bands on the thorax of the female who is otherwise black. It flies from April to August and is an important pollinator of fruit trees.
Another is the tawny mining bee (Andrena fulva). The female has bright red hairs on her thorax. It flies from March to June and feeds on a variety of nectar-producing and pollen-bearing plants and trees.
The early mining bee (Andrena haemorhhoa) is named for the blood-red tip on its abdomen and red hairs on its thorax and flies from April to July. One of the defining behaviours of the wool carder bee (Anthidium maculatum) is collecting hairs from plants for its nest. The small sallow mining bee (Andrena praecox) is a sallow specialist. There are many more species of these intriguing bees.
Learning about mining bees and their favoured habitat in sandy banks has led me to contemplate how I have long intuited a connection between Belisama, ‘Shining One’, the goddess of the Ribble, and bees. At first I thought this was because she is connected with light and sunshine and the coming of spring and summer, when bees emerge and take flight, but now I see she has a particular connection with mining bees who build their homes on the Ribble’s banks and sandy banks left by the river.
Ryan Clark, ‘Guide to Solitary Bees in Britain’, The Wildlife Trusts https://www.wildlifetrusts.org/blog/ryan-clark/guide-solitary-bees-britain
‘Solitary Bees: 8 Facts to Know Plus an Identification Resource’, Wild Care, https://www.wildcare.co.uk/blog/solitary-bees-8-facts-to-know-plus-an-identification-resource/
‘Andrena’, Nature Guide, https://sites.google.com/site/natureguideuk/home/bees/andrena