Pollinators – bees
There are many invertebrate pollinators all of which are important, they help to provide us with the food we eat and the rich variety of habitats and plant life we can see, use and enjoy. Not many people realise that beetles, flies, moths, butterflies and wasps are pollinators as well as the more commonly recognized honeybees, bumblebees and solitary bees.
Classification of bees
There are around 250 species of Bee in the UK, made up of 24 species of bumblebee, around 225 species of solitary bee and a single species of honeybee. They form part of a large order of insects known as the Hymenoptera. In the UK there are six family groups which can be further classified in to genera and then individual species.
- Order: Hymenoptera
- Family: Apidae
- Genera: Bombus
- Species: Bombus Terrestris
The family groups of UK species
- Andrenidae – Solitary, subterranean nesting bees. Nests can be isolated or in an aggregation (meaning grouped together). Most species are polylectic (will feed on a variety of plants).
- Apidae – Includes Bumblebees and Honeybees
- Colletidae – Solitary short tongued bees, subterranean or aerial nesting. Some species are cleptoparasitic on other species in the same family.
- Halictidae – Subterranean-nesting with short, pointed tongues.
- Megachilidae –Long-tongued solitary bees. Pollen carrying hairs present on the abdomen rather than the hind legs (except for the cleptoparasitic species).
- Melittidae – Solitary bees with short, pointed tongues.
Social or solitary?
The majority of our bee species are solitary. They sometimes nest in large groups but each nest is the work of a single female, they have no queen or caste system.
The 2 types of solitary bees are:
- Mining bees – They excavate holes in the ground. Some species will use communal entrance holes but then branch off and create their own nest tunnels
- Cavity nesting bees – Masked, Mason and Leafcutter bees use existing cavities in wood, mortar or hollow plant stems, which they section off using mud or chewed leaves
Only bumblebees and Honey bees are truly social bees. Each colony is comprised of a queen and female workers. The queen will lay the eggs which develop in to larvae which the workers care for; older workers have the responsibility of foraging for nectar and pollen.