Roy McGhie – Conservation Project Assistant
Recently my colleague Ami and I went on an organised farm walk near Menethorpe to the south of the North York Moors. The event was led by the Campaign for the Farmed Environment and the theme was habitat management for pollinators. The walk was well attended by local land managers who wanted to know a bit more about the benefits that pollinators provide, and how they might most easily encourage them, in particular on otherwise unproductive areas of their land.
The main focus of our discussion was inevitably bees – our most efficacious pollinators. We were given copies of an excellent booklet from the Centre of Ecology and Hydrology called ‘Habitat Creation and Management for Pollinators’.
We’ve mentioned bees a number of times before in this blog, but felt it was about time they had their own post because they are so important.
In the UK whilst there is only one species of honey bee Apis mellifera (both wild and semi-domesticated), there are about half a dozen common bumble bees and over twenty common species of solitary bees like mining bees, mason bees and leaf cutter bees.
The bee flying season can begin as early as March and extend right the way into October, as long as there is food i.e. nectar and pollen available. Most species of bees can survive over winter if there is somewhere for them to hole up.
The anatomy of different bee species varies greatly, and so to assist most species it’s best to have a wide range of flower species from which they can feed. As some of the mining bees have short tongues of only 4-5mm, they need open flowers such as cow parsley and daisies. The garden bumblebee Bombus hortorum on the other hand has a tongue that can extend to around 12mm, so it can feed from flowers with a long corolla (i.e. petals) like foxgloves and honeysuckle.
As well as fragrance, one of the other things that attracts bees to flowers is colour. So its worth considering maintaining colours throughout the season. For example, coltsfoot and hawk’s beard provide yellow colour from about February to June, and then cat’s ear and bristly oxtongue do the same from June to October. Similarly, a successional combination of white deadnettle, oxeye daisy and yarrow can ensure there are plenty of white flowers throughout the year. Interestingly, it is thought that bees can see in ultraviolet, which means how they perceive flowers will be very different from how we do.
Establishing and managing a wildflower meadow is one of the most effective ways of ensuring bees have a suitable habitat. In addition it is thought that on arable farms having a flower-rich margin on at least 1% of the land will provide significant benefit to pollinators, which in turn will improve crop production and quality. Hedgerows can be another useful way to help bees – cutting hedges on a two or even three year cycle will encourage more hawthorn and blackthorn flowers. When new hedges are planted, a greater species diversity (using hazel, field maple, crab apple, holly and willow where appropriate) will also mean that there is more food and nectar available for a longer period throughout the year.
Bees are fantastic creatures in their own right. They also provide a number of hugely important direct benefits for our countryside and environment. There are things we can do to encourage bee survival such as sowing appropriate wildflowers and creating habitat stepping stones, allowing what we might think of as typically weeds to flourish (in the right place), creating patches of bare ground in sunny dry spots which will allow solitary mining bees to nest, and leaving tall grass over winter which can provide places for bumblebees to hibernate and nest.
Bees are often in the news these days, mostly because they are in decline – they even need their own national strategy. If we can do our best to make the landscape more friendly, we can help give bees a better chance, and ensure they can continue to play a key role in pollinating our flowers, trees and crops.
For a local initiative – see B-Lines Ryedale