Biodiversity conservation and recovery in the river basin of Asón

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Biodiversity conservation and recovery in the river basin of Asón

Factsheet: Biodiversity conservation and recovery in the river basin of Asón

Country ES
River Name Asón
Site Name Biodiversity conservation and recovery in the river basin of Asón
River Characterisation
    River typology
    Location (Lat Lon) 43.3364781535722, -3.43048095703125
    Altitude mid-altitude: 200 - 800 m
    Catchment area medium: > 100 - 1000 km2
    National code/
    River type name
    29 ejes fluviales principales cantabro-atlánticos calcáreos
    Hydromorphological quality elements

    Biological quality elements
    Ecosystem Services
    EU Directives
    Project size ha
    Approximate costs > 1 000 000 Euros
    Synergy Site of Community Importance Río Asón
    Status Realised
    Period of realization 1999 - 2004
    Implemented by Fundación Naturaleza y Hombre

    Key features of the case study

    Site description

    The Ansón river source is located in the Collados del Asón Natural Park. It flows through habitats classified as of Community interest, including caves and rocks, peat bogs, beech and oak forests, Mediterranean holm-oak forests and gallery forests along its banks. These are the habitats of species of great interest such as Pyrenean musk rat, wolf, salmon and European bison. Downstream, where the waters from the river meet the sea, lie the Santoña salt marshes. This site is an important staging post on the migration route for hundreds of species of birds, which congregate there during the winter. Three sites representative of the valuable ecosystems along this river have been proposed for inclusion in the Natura 2000 network.

    Source of the Ansón river at the Cailagua cascade, a spectacular landscape.

    Measures selection

    Success criteria

    Ecological response

    Hydromorphological response

    Monitoring before and after implementation of the project

    Socio-economic aspects

    Contact person within the organization

    Fundación Naturaleza y Hombre[[1]]

    C/ 18 de Julio, 25
    39610 El Astillero
    Project Manager: Carlos Sánchez Martínez

    Extra background information

    One of the main pressures is the surface water abstraction. In 1973 the Hydraulic Planning Service had the rights for extract 150 l/s over a period of 99 years from the Confederación Hidrográfica del Norte. The demographic evolution of the coast towns (even higher during the summer), the urbanisation and the increase of the industrial use of water made this concession obsolete. Subsequentley, the construction of bombs and the substitution of the existing pipes by ones of bigger capacity enabled the extraction of an amount of water much higher than allowed.

    The reduction of flow at dry summer periods is reflected in the inexistence of flow. Also,this decrease would affect not only the Ason River, but to the Marshes themselves, where changes in the patterns of salinity (keys to the very existence of the marsh)during periods of severe drought alterations, may affect the biological communities.

    Other threats to this site derived from human activities and over-use of the resources are: draining of the marshes, unauthorised shellfish farming, illegal fishing, poaching and the spread of exotic species. Misplanning and mismanagement of tourism, in turn, are having an adverse impact on conservation of some of these sites.


    Web of the Life Project Biodiversity conservation and recovery in the river basin of Asón [2]
    Web of the NGO Naturaleza y Hombre. News related to the project [[3]]

    Related Measures

    Related Pressures