Negro

Negro

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Key features of the case study

• The ecological improvement of the Negro river is part of a national river restoration programme, Estrategia Nacional de Restauración de Ríos, developed by the Ministerio de Ministerio de Medio Ambiente, y Medio Rural y Marino (Ministry of Environment). The Confederación Hidrográfica del Duero is the organism which has implemented this project, as others of the Duero basin.
• The principal objective of this initiative is to restore trout populations and the naiad Margaritifera margaritifera, which is in serious danger of extinction.
• The main threat to these species is the presence of weirs that make difficult or impossible the migration of the trouts upstream,which are the propagation vector of the naiads, affecting their reproduction.

Site description

The Negro river drains the the area located at the south of Sierra de la Cabrera, of siliceous substrate (gneiss, slate and quartzite). The climate is meaditerranean with atlantic influence.
The total or partial removal of riparian vegetation at some reaches has caused the loss of natural channel morphology. The transformation of the riparian forest and floodplain into flood meadows is another reason of morphological alteration.
There are various impoundments at the river for different uses(mills, forges, irrigation pipes,etc.)increasing the solids contribution and the interrupting the longitudinal connectivity.

Negro river

Presence of transversal barriers at the channel.

Related Measures

No measures have been assigned to this project.

Related Pressures

No related pressures were found.