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KERNOW ECOLOGY

Invertebrate Survey and Conservation

KERNOW ECOLOGY

Andrena hattofiana

Action to help The Large Scabious Bee

The Large Scabious Bee is a Nationally Scarce mining bee which is specialised on Field Scabious and Small Scabious pollen. I have been working with partners to help safeguard this bee in Cornwall.

The Large Scabious Bee (Andrena hattofiana) only occurs on about 7 2km squares in Cornwall. These are typically dune edge sites where Field Scabious occurs. Kelsey Head area supports a strong population of this bee but on most Cornish sites only small numbers have been recorded and many sites are either small or fragmented. Gwithian/Hayle Towans is a large dune system but the main colony is located in a small churchyard. There are only small numbers recorded outside this site and across the Towans scabious abundance is poor. It has been estimated to need 780 flowers to provide for a minimum population of 10 Large Scabious Bees. The bee is likely to have always been localized in Cornwall, although the records suggest some decline. The Small Scabious Bee (Andrena marginata) was also found on some of these sites but now appears to be extinct. Action is needed to safeguard the species in Cornwall by boosting Field Scabious abundance.

Scabious bee

Large Scabious Bee

Scabious

Suitable abundance of scabious at one of the best sites

Scabious management

Field Scabious is vulnerable to rabbit grazing on dune systems, but potentially any summer grazing can be damaging. Scabious generally is found in taller grassland. A number of sites with the best flowering scabious are roughs on large golf courses. Rotational cutting or grazing in winter or autumn is likely to be the best form of habitat management. Will Hawkes did a comprehensive survey for the Large Scabious Bee in 2015

I am working with National Trust, Cornwall Living Churchyards, the Wheal Buzzy Project and West Cornwall Golf Club. I have been growing and planting local provenance Field Scabious to plant on suitable sites to better secure populations.

Male and female Large Scabious Bee

Male and female Large Scabious Bee

The Small Scabious Bee

The Small Scabious Bee (Andrena Marginata) another scabious specialist which formerly occurred in Cornwall