September is certainly a good month for insects – and is the month for ivy bees, which time their emergence to feed on flowering ivy. Ivy bee is also known as ivy mining bee, and though it’s defined as a solitary bee, they ‘mine’ in aggregations. They like sandy ground, which can include lawns. Ivy bee is such a familiar part of the September scene that it’s easy to forget that it was first recorded in the UK as recently as 2001, reaching Norfolk by 2014.
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Ivy bee. Ivy in Whitlingham Lane, the approach to Thorpe Marshes, can be a good place to see these. |
Migrant hawkers were once called scarce hawkers, reflecting their former rarity. Now, not only are they an established breeding species in the UK, these hawkers’ strong flight means they can be seen far from water. As the British Dragonfly Society notes, this species has increased its range dramatically northwards in recent decades, linked to climate change. A typical view is a glimpsed, fast-flying and mostly blue patterned dragonfly, at least for a male. If you’re lucky they will land and ‘hang’ on vegetation when they can be quite approachable. Look out for a ‘golf tee’ mark on the thorax – which is also a feature of browner females.
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Migrant hawker (male). |
A red dragonfly in September is likely to be a common darter, and ‘common’ really is apt. The older they are, the redder they look – and that also goes for female common darters. A feature of this species in autumn is that they absorb warmth from wooden structures, so if you see a dragonfly on a bench or a fence it’ll almost certainly be a common darter – especially so in the cooler months of October and November.
Common darter, soaking up some warmth from a wooden rail. |
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Common darter. |
Willow emeralds, it’s fair to say, are a rather special damselfly. They are in a small group of damsels called spreadwings, the name describing how the wings are held, in contrast to most other damselflies where the wings are held roughly parallel to the body. Many emerge as adults in August, though September is their peak month. The best place to look for them is on the edge of bushes or plants overhanging permanent open water, such as a ditch at Thorpe Marshes. Look very carefully on a thin branch over water, often a willow, and you might see a female doing what is special to this species: they scratch a small groove and lay their eggs in the bark of waterside trees, not under water like most damselflies. Like the migrant hawker, the willow emerald’s occurrence here is driven by climate change: their spread across England this century has been sensational.
Willow emerald damselfly, in characteristic 'spreadwing' pose. |
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Chris Durdin lives in Thorpe St Andrew. He runs Honeyguide Wildlife Holidays www.honeyguide.co.uk and is the guide for the monthly guided walks at NWT Thorpe Marshes. This blog was first written as an article for Just Thorpe St Andrew.