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Climate change: Dragonflies spread north in warming world

Climate change: Dragonflies spread north in warming world

Dragonflies are moving northwards across Britain and Ireland as temperatures rise.

More than 40% of species have increased their distribution since 1970, while only about 10% have declined, according to a new report.

Experts from the British Dragonfly Society say it's an indicator of the effects of climate change.

Conservation officer Eleanor Colver said while their data can determine where dragonflies are, it cannot determine exactly how many there are - and whether numbers have increased overall.

"Factors such as the use of pesticides (reducing their flying insect prey), water pollution and habitat loss continue to threaten the health of dragonfly populations within species' existing ranges," she said.

The report, State of Dragonflies 2021, incorporates 1.4 million records from 17,000 recorders gathered from 1970 onwards.

It assesses the fortunes of 46 species of dragonflies and their close relative - the damselflies - across Britain and Ireland.

Since 1995, several species have reached Britain from southern Europe for the first time - and at least two more have reappeared after long absences.

Species expanding their range include the emperor dragonfly, migrant hawker, ruddy darter, black-tailed skimmer and small red-eyed damselfly.

In contrast, some upland and northern dragonflies are in retreat, including the common hawker and black darter, perhaps because of the loss of peatbogs or extreme droughts.

"The increase in many species, if not all, we can put down to a combination of climate warming and more or better wetland habitats such as an increase in the number of ponds, lakes, gravel-pits and reservoirs in recent decades," said Dave Smallshire, co-editor of the report.

But people should not get the message that all is "tickety-boo with dragonflies", he added.

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