have discovered that the sea lamprey, Petromyzon marinus , could help counteract the decline of the species . They have found that it could be used to boost populations of freshwater naiads or clams. With this study they have also discovered two species that, in a less efficient way, could also act as hosts. Factors such as the construction of dams, the pollution of the waters or the increase in temperature also cause the naiads to be one of the groups of animals that face the most problems to survive in the rivers. Margaritifera auricularia is one of the species whose survival is most compromised since there are currently some groups of aging populations, one in the Ebro basin and others in four French river basins. In the case

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of M. auricularia , the disappearance of the species that Saint Helena Email List acted as hosts for its larvae (glochids), seems to be one of the main factors for its populations to have decreased by 90% in the last two centuries. “The European sturgeon, considered the main host of M. auricularia, gradually disappeared throughout the 20th century and is currently practically extinct”, contextualizes the MNCN researcher Joaquín Soler. “Although the number of juvenile specimens is very low, we have found evidence of a recent reproduction of M. auricularia in the French rivers Vienne and Creuse, where the sturgeon disappeared long ago.” New hosts, new hopes In this research, they have detected three new host species for M. auricularia : the spiny, lamprey and catfish,

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revealing a wider host range than previously thought. As with the previously identified hosts, the new ones also appear to have a remarkable tolerance to salinity. It is possible that this relationship arose from the advantage that migratory species confer for the dispersal of clams. The results of the study suggest that P. marinus has played a key role in preventing the total extinction of M. auricularia in France after the disappearance of the European sturgeon. However, in the Ebro basin, the sea lamprey stopped being able to go up the river after the construction of large dams in the middle of the 20th century. The problem of acidification of the Pyrenean water resources is not a phenomenon located in specific points of the Central Pyrenees, as

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