Migrant Hawker
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Odonata
Suborder:	Anisoptera
Family:	Aeshnidae
Genus:	Aeshna
Species:	A. mixta
Binomial name
Aeshna mixta (Latreille, 1805)

The Migrant Hawker (Aeshna mixta) is one of the smaller species of hawker dragonflies. In Europe A. mixta is one of the most common aeshna species and it is very similar in appearance to the less abundant A. affinis. The species prefers still or slow-flowing water and can tolerate brackish sites. The flight period is from July to the end of October. They can be found in North Africa, southern and central Europe to the Baltic region.

[edit] Identification

A. mixta is a small aeshna which appears dark in flight. It is similar in appearance to other aeshnas but has a characteristic "golf-tee" shaped mark on the second segment of the abdommen (S2) which is characteristic. The main identification problem in the field is distinguishing this species from A. affinis where the two species fly together. The markings on the side of the thorax are different in A. affinis and A. mixta. In A. affinis the sides of the thorax are greeny yellow with fine black lines along the sutures. In A. mixta the sides of the thorax are similar in colour but the yellow is separated by dark brown areas so it gives the appaerance of having two broad yellow stripes.

Male 'A. mixta'

Detail showing characteristic marking

Female A. mixta, side view

[edit] Distribution and Habitat

A. mixta is found throughout central and southern Europe, north Africa, the Middle East and across Asia to China and Japan. As it is a migratory species it can occur outside its normal range and in recent years it has been spreading northwards. For example in the United Kingdom this insect was rare until the 1940s when it began migrating from the continent in large numbers. It continues to do so and is now a resident breeding species throughout England and Wales. It reached the Isle of Man in 1998 and Ireland in 2000. It is breed in lakes and ponds and is tolerant of brackish water. It is also found away from water hawking high amonst trees and bushes.

[edit] Behaviour

A. mixta has been seen on the wing in all months of the year but generally is on the wing from July to Late October or early November. After emergence the immature adults fly away from water and spends their time feeding and becomming sexually mature. Once mature they return to water and begin mating behaviour with the males patroling looking for females. A. mixta males are less territorial than other male aeshnas. They form a tandem pairing with a female on the wing and copulate. After mating the male and female split up and the female oviposits alone. The eggs develop and then enter dipause and it is as diapause eggs that A. mixta overwinter. In spring the eggs hatch into a prolarva which only lasts from a few seconds to a few minutes, the prolarva then molts into a stadium 2 larva. Larval development is rapid and adults emerge in summer. A. mixta is a univoltine species, that is to say that it compleats its life-cycle in one year.

[edit] References

• Askew, R.R. (2004) The Dragonflies of Europe. (revised ed.) Harley Books. ISBN 0946589755
• d'Aguilar, J., Dommanget, JL., and Prechac, R. (1986) A field guide to the Dragonflies of Britain, Europe and North Africa. Collins. pp336. ISBN 0002194368
• Boudot JP., et al. (2009) Atlas of the Odonata of the Mediterranean and North Africa. Libellula Supplement 9:1-256.
• Dijkstra, K-D.B & Lewington, R. (2006) Field Guide to the Dragonflies of Britain and Europe. British Wildlife Publishing. ISBN 0953139948.

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