Aeshna juncea

(Linnaeus, 1758)

Common Hawker, Moorland Hawker, Sedge Darner

Aeshna juncea, known as the Common Hawker, Moorland Hawker, or Sedge Darner, is a large hawker with a Holarctic distribution spanning the Palearctic from Ireland to Japan and northern North America. It is one of the larger Aeshna and is strongly associated with acidic bog , particularly in Scotland where it is a prominent bog . The species has a period from June to early October. Recent genomic research has revealed that Alaskan underwent population bottlenecks during the most recent ice age, and the species has been used as a model for studying size variation in Odonata driven by and repetitive elements.

Aeshna juncea by the Smithsonian. Used under a CC0 license.

Newborn-imago-AEJU by wikipedia. Used under a CC BY-SA 3.0 license.

Unusually Coloured Male Common Hawker (Aeshna juncea) - geograph.org.uk - 2592011 by Doug Mortimer . Used under a CC BY-SA 2.0 license.

Pronunciation

How to pronounce Aeshna juncea: //ˈiːʃnə ˈdʒʌŋkiə//

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Images

Habitat

Acidic bogs and peatlands, particularly in upland and moorland areas. In Scotland, it is described as one of the most prominent bog , frequently found in and around bog pools on peatland restoration sites. The requires acidic bog pools for -laying and is associated with Sphagnum moss and heather vegetation.

Distribution

Holarctic: Palearctic region from Ireland to Japan, and northern North America. Present in Europe and Northern Asia (excluding China), North America, and Southern Asia. Specifically documented in Scotland, Alaska, and Flanders, Belgium.

Seasonality

period from June to early October.

Diet

hunt small insects on the wing. Nymphs are predatory, feeding on small and potentially small fish and tadpoles.

Life Cycle

with three stages: , nymph (naiad), and . Eggs are laid in water, typically in aquatic vegetation or submerged debris in bog pools. Nymphs lead an entirely aquatic lifestyle and undergo a series of moults as they grow, with the nymphal stage lasting from a few months to several years depending on conditions. Mature nymphs climb out of water onto emergent vegetation to emerge as adults.

Behavior

are known for exceptional abilities and agility. They patrol territories, hunt insects on the wing, and engage in . In bog , adults fly low over Sphagnum moss and heather while hunting. Females have been observed -laying in bog pools.

Ecological Role

in both aquatic (nymphal) and terrestrial/aerial () . As a bog , it serves as an for healthy acidic peatland .

Human Relevance

Subject of genomic research as a model for understanding Arctic survival adaptations and evolution in Odonata. Featured in conservation efforts for peatland restoration in Scotland. Its presence indicates healthy bog that provide carbon and other ecosystem services.

Similar Taxa

Aeshna caerulea (Azure Hawker)Both are Aeshna hawkers found in Scottish bogs; A. caerulea is distinguished by azure blue body coloration and dark wings, and is currently vulnerable with a restricted range in the Scottish Highlands, whereas A. juncea is more widespread and has yellow thoracic stripes
Aeshna persephone (Persephone's Darner)Both are large Aeshna darners; A. persephone occurs in southwestern North America (New Mexico, Arizona) and can be distinguished by geographic range and subtle morphological differences in color pattern