[ We use video recording with a vehicle operated remotely -ROV- on the river Ebro in Burgos to locate evidence of Margaritifera auricularia ]

During the first week of October, field work was carried out to locate signs or live naiads of the species studied with the participation of this new technical equipment in this type of work, in deep waters (up to 6 m) of the Ebro riverbed in the Miranda de Ebro T.M. (Burgos). By means of this little or no intrusive technique with the river bottoms we obtain a detailed knowledge of the composition of the bottoms (sediment typologies) and also of the biological communities (naiads and other animals or plants) linked to the deep benthos.

Assistance from an auxiliary kayak on the surface makes it possible to direct the operations, inspect the banks in detail and take dredging samples of the sediment from the deepest wells of the Ebro in Burgos.

” Study for the improvement of the knowledge of the population situation of Margaritifera auricularia in Castilla y León. EN04-19 “

The detailed videorecording of the funds with 3 HD cameras of the transect lines that cross the ROV, which are maintained by means of a surface guide tied to the trees of the bank, allows to record in a permanent way a good part of the inspected surface of about 2m upstream and downstream of the same one. In this way a methodology very similar to that of counting in plots in wadeable sections is carried out, but without disturbing the bottoms in the same intensity that is done by means of diving and with permanent recording of an enormous volume of data.