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Bog hoverfly

The Bog hoverfly (Eristalis cryptarum) is a rare hoverfly that in recent years has been found only within a restricted area of Dartmoor. This hoverfly is extremely rare and is identified in the UK Biodiversity Action Plan (UKBAP) as a priority species for conservation action.

There are historic records of the Bog hoverfly from Hampshire (latest records dated from 1938), Dorset (last recorded in 1938), Somerset (last records from 1951) and Cornwall (last recorded in 1947). The last in-depth survey on Dartmoor was conducted in 2008 (Walters, J., 2008). At present little is known about the larval and adult ecology of the Bog hoverfly. Knowledge of both is essential for completing successful surveys and developing effective conservation measures.

Bog hoverfly (Eristalis cryptarum) (c) Steven Falk

Bog hoverfly (Eristalis cryptarum) (c) Steven Falk

There is an urgent need to study this species ecology so as to integrate species conservation into landscape scale conservation initiatives. By studying this species’ ecology we can better target habitat management to enhance populations and prevent any further decline.

The main aims of this project are to confirm the current status and distribution of the Bog hoverfly through site survey and to conduct a study of adult and larval ecology.

This project is supported by the People's Trust for Endangered Species through their invertebrate internships programme, and is in partnership with Dartmoor National Park Authority.

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