Working to conserve dragonflies and their wetland habitats

Norfolk Hawker

Aeshna isosceles

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Description

Length: 67mm

The Norfolk Hawker is one of 2 brown hawker dragonflies found in Britain. It has clear untinted wings, green eyes and a yellow triangular mark on the second abdominal segment.

Management Fact File

Habitat

The optimum conditions for breeding appear to be unspoilt grazing marsh dyke systems with clean, non-saline water, rushy margins, preferably with an abundance of water soldier as well as other aquatic plants.

Status & Distribution

The Norfolk Hawker is currently restricted to the fens and grazing marshes that are relatively isolated from polluted water in the Broadlands of Norfolk and Northeast Suffolk. A Local Biodiversity Action Plan (LBAP) for the Norfolk Hawker has been drafted for Norfolk. This is a red data book species protected under the Wildlife and Countryside Act.


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Similar species

Similar in colour to Brown Hawker but the clear wings, green eyes and very restricted habitat help identification.

Threats

The main threats to this species come from the conversion of grazing marsh to arable farming, inappropriate ditch management, nutrient enrichment, pollution, the impact of global climate change and fluctuations in water levels.

Management

General management principles include maintaining grazing marshes, controlling saline intrusion, controlling nutrient enrichment. There are also best practice guidelines for managing inhabited sites, particularly the dyke vegetation and the surrounding terrestrial habitats.

Case Study

Work is underway to restore habitats for this species in Norfolk.