DSC8993 Demoiselle... - a photo on Flickriver

            Beautiful Demoiselle (m) - Calopteryx Virgo

Mainly found along streams and rivers, particularly those with sand or gravel bottoms. The males rest on bank side vegetation waiting for females.
Males are territorial, perching in bankside plants and trees, waiting for females or chasing. They chase passing insects, often returning to the same perch. Males can stray well away from water, females live away from water unless egg-laying or seeking a mate.

As with the banded demoiselle is also in the blue wing-demoiselle a pronounced territorial behavior of sexually mature males. These days occupy territories that they defend against other males. The defense consists mostly in threatening gestures. For this they spread their wings and put them on display so clearly visible, there is also Drohflügen and in rare cases to air combat between rival males. Optimal areas correspond to the optimal nesting places for the females and are characterized by a normally increased flow and a suitable oviposition substrate in the potential breeding sites from. The size of the spots and their distance apart is the density of the population dependent as well as the occurrences of the water and may be between several meters and a few decimetres. Males who do not occupy spots can keep themselves in the vegetation on the shore and try to mate with fly to females or to fill vacant spots. Especially when only a few males are present, the territorial defense is very aggressive, with a higher number of competing male aggression but decreases significantly. The males sit in their areas mostly in exposed places in the vegetation, which extends over the water, sometimes on vegetation or rocks cushions amid the waters. This seat is waiting at the same time the center of the district they do their gaze primarily on the aquatic center and will show a behavior that is referred to as "wings lapping" and in which the wings beat quickly down and slowly lifted. It is believed that it is mainly used for communication, it also supports the ventilation in the thorax and accordingly probably also plays a role in thermoregulation of the animals

Taken on: May 23, 2019

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