[ Monitoring of Margaritifera auricularia in the river Ebro of Burgos ]
During the week of 24 to 28 June, fieldwork continued for the development of technical assistance. ” Study for the improvement of the knowledge of the population situation of Margaritifera auricularia in Castilla y León. EN04-19 ” in wadeable areas. Although from Tuesday 25th onwards the highest flow from the Ebro reservoir flows through the high channel, this has led to greater turbulence of the water and clouding of the transparent conditions of the water. Work has already been carried out to characterise the meso and microhabitat (in water and sediment) for most of the wadeable points chosen in the riverbed in the province of Burgos.
” Study for the improvement of the knowledge of the population situation of Margaritifera auricularia in Castilla y León. EN04-19 “
In addition, the first phase of the water collection campaign for the analysis of eDNA has been carried out, for which the chilled water was maintained during the field trips by means of an isothermal vehicle equipped with an industrial cooler. Essential equipment to be able to comply with the maintenance protocol of the water at very low temperature until its final freezing.
In the prospecting plots upstream of the Sobrón reservoir, important populations of other naiads present in this river (especially Potomida littoralis), as well as blenios (Salaria fluviatilis), have been located. The specific host of the bivalve under study.
The massive presence of the zebra mussel (Dreissena polymorpha) and the absence of the Asian clam (Corbicula fluminea) in the bed of the river up to the mouth of the Jerea has been observed in all the bottoms surveyed up to the mouth of the Jerea.