Mededelingen Een nieuwe populatie van de Gevlekte glanslibel (Somatochlora flavomaculata) in Nederland?

A possible new population of Somatochlora flavomaculata was discovered on July 17 1999 in the Weerribben, a large moor reserve in the northeastern Dutch province of Overijssel. S. flavomaculata is a rare species in Western-Europe. In the last century it has become very rare in Holland and it has been marked as ‘seriously threatened' on the Dutch Red List. The only known Dutch population at the time was in the southern province of Noord-Brabant. In the Weerribben about ten individuals of S. flavomaculata were found flying above a part (approximately 100 meters) of a walkingtrail and above the ditch that laid alongside this trail. The habitat where the dragonflies were found, matched almost exactly the known habitat for this species. Therefore it is likely that, although no mating was seen and no eggs or larvae were found, a (small) population of S. flavomaculata exists in this area. The sightings (in 1999 and 2000) of S. flavomaculata in two nearby areas in Overijssel support this idea. In addition, more sightings of S. flavomaculata at three locations in the Weerribben were done during 2001.