Fred Christoffels made this video.
In the 1960s there was quarrying in a sandy area in Friesland province in the Netherlands. This led to lakelets. Fish which eat dragonfly larvae didn’t live there, so this water was excellent for dragonfly reproduction.
Experts have created a new form of highly-efficient, low-cost, sustainable insulation based on the wings of a dragonfly: here.
This video says about itself:
18 October 2013
In 1986, the hospital closed down. The area became a nature reserve. Various wildlife species started to use the swimming pool. Prominent among them, blue hawker dragonflies.
There is a report by Sjek Venhuis on blue hawkers at that pool in 2013-2017 on the Internet. In summer, adults of this beautiful insect species come there to mate. Females deposit their eggs on the banks of the old swimming pool. In winter, dragonfly larvae crawl on the bottom.
The old pool is now one of the most important blue hawker spots in the Netherlands. In 2017, at least 200 females deposited eggs there.
Translated from Dutch Vroege Vogels radio:
Dragonflies on watercolors
Friday, December 1, 2017
At the end of the nineteenth century, the Belgian Baron Edmond de Sélys Longchamps drew and painted many hundreds of dragonflies. Not for fun, but for science.
An important and valuable collection. Still, the folders with dragonfly aquarelles fell into oblivion. But in 2002 they were found again, almost literally under a layer of dust in a cabinet at the Royal Belgian Institute of Natural Sciences in Brussels.
Since then the Dutch dragonfly researchers Karin Verspui and Marcel Wasscher have studied the drawings. ‘We are talking about a time when there was obviously no good photography yet. This kind of drawings and watercolors were the gold standard for describing species”, says Verspui. ‘There are very special examples, including many so-called holotype specimens. These are the original individuals used to describe a new species. Where most of the type specimens themselves have completely lost their color, these watercolors are still of exceptional quality. These drawings deserve a larger audience”, says Verspui.
The digitized watercolors can be found on the RBINS site.
Ms Verspui said today on radio that Baron Edmond de Sélys Longchamps was an amateur entomologist. Nevertheless, he wrote scientific descriptions of about 700 dragonfly and damselfly species; about a third of the 2000 species known to science then.