Calopteryx virgo is a fairly rare species in The Netherlands that has suffered a strong decline. It is presently known from 16 populations in the extreme east and south of the country. The species has disappeared in a large part of its former range, mainly due to habitat destruction and, to a lesser extent, water pollution. Unlike Calopteryx splendens, the species has not fully recovered following the improvement of the water quality. Some populations have shown
rising numbers during the last decade, however. The species is classified as endangered in the Red List.
Ketelaar, R., Heeffer, J.