Les obs hivernales ne sont pas fréquentes, il me semble qu'on avait déjà évoqué ce document lors d'un précédent post sur ce sujet
On trouve aussi ça :
Ouden, A. den & J. van Roosmalen, 2011. Favorite hibernating spots of Sympecma fusca. Brachytron 14(1): 28-39.
In the period between 2006 and 2011, hibernating Sympecma fusca have been studied at several sites in the Dutch provinces of Noord-Brabant, Limburg, Gelderland and Noord-Holland. Observations have been made on habitat preference and weather-driven behaviour of the species in winter. Furthermore, experience on the best search strategy was gained. Most hibernating damselflies of the inland populations were found in bushes of Calluna vulgaris or, less often, tussocks of Molinia caerulea. Most hibernating damselflies of the coastal dunes population were found on branches of Salix repens. All locations had a southward exposure in common, offering sunny conditions. They were all shielded from the wind by surrounding forest edges. The damselflies were most easily found during bleak weather conditions, when they are unable to turn away from the observer. The light-colored
Bon allez sans rancune et un grand 
