The river Trebbia flows from the Appennino Ligure-Emiliano to the river Po, near Piacenza, through a great variety of habitats and situations. The stretch of river between Bobbio and Perino, about 12 Kilometres long, is in fact in the middle of its whole course and is set in a context characterized by an interesting ecosystem variability, with still considerable high mountains, extensive agricultural areas and tracts of stabilized exposed gravelly river bed, which is covered by forest mantels, moors and dry grasslands.

Despite the presence of S.A.C.s (M.CAPRA, M.TRE ABATI, M.ARMELIO, S.AGOSTINO, LAGO DI AVERALDI), IT4010005 (PIETRA PARCELLARA and SASSI NERI) e IT4010011 (FRiver TREBBIA from PERINO to BOBBIO) della NATURA 2000 Network ,this environment turns out to be threatened both by an anthropogenic impact certainly due to the numerous inhabited centres, the heavy tourism flow, the realisation of a new road section Perino-Barberino, the various interventions of water control, and by the large spreading of artificial forest types and a prospective abandonment of the agriculture activity. The worst elements of environment alteration consist of the extreme simplification of the river layout, the partial cementation and change of its natural sections, the consequent increase of the current speed and water erosion power, the presence - in the river bed - of big old landslides faces, of a concrete wall, which stops the water-course continuity and - on the slopes - of a wide covering of allochthonous conifers and arable lands now uncultivated.

Therefore the project aims at the development and enhancement of this ecosystem in a multifunctional way, through rehabilitation activities and conservation of habitats and species of Community interest, unsettled by disturbing factors linked to the periodical and irregular human activity.

In particular, we have realized the stabilization of thalweg, together with the construction of a reclimbing ramp for fish and the adjustment of a landslide by bioengineering techniques, in order to encourage a widespread increase of fish species populations, of Community interest, such as LEUCISCUS SOUFFIA (STROEMLING), CHONDROSTOMA GENEI (SOUTH EUROPEAN NASE), BARBUS PLEBEJUS (BARBEL) , BARBUS MERIDIONALIS (BARBO CANINO), COBITIS TENIA (ITALIAN LOACH), PADAGOBIUS MARTENSI (GOBY) and GOBIO GOBIO (GUDGEON).

The accomplishment of the interventions will also benefit the biodiversity of this habitat. By removing the cement and reducing the water erosion power, they will contribute to the development of Community interest habitats habitats - 3270 CHENOPODIETUM RUBRI OF SUBMONTANE RIVERSi in driest and pebble micro areas and 3240 ALPINE RIVERS AND THEIR RIVERAIN WOODY VEGETATION OF SALIX ELEAGNOS on the river banks.

Also the creation of an sub-surface flow system in Pradella, together with the development of other two free water surface wetlands (in Bobbio and Travo), contribute - through the quality improvement of the river water - to improve fish life conditions and indirectly to support the trophic need for fish eating birds, by potentially installing them along the river reach.

Moreover the realization of a fluvial biotope at the river reach for amphibians species, such as in particular the DALMATIAN FROG, and the widening of the existing forest mantel plantation with plant species listed in the habitats of Community interest 92A0 - GALLERY FORESTS OF SALIX ALBA AND POPULUS ALBA enhance the environmental value and the biodiversity increase of the area.

The "environment rivitalizing" project and general increase of trophic survey will also indirectly benefit several falconiform species of Community interest, of passage and breeding on the mountain rocks near the river, such as PERNIS APIVORUS (HONEY BUZZARD), CIRCAETUS GALLICUS (SHORT-TOED EAGLE). These two species will also be directly favoured by a model operational plan about the sinanthropus origin pine groves (PINUS NIGRA) of Monte Armelio, aimed at the preservation of their nesting habitats. While the interventions of habitat enhancement for the fauna near Pietra Parcellara will improve nutrition and refuge of species such a PERDIX PERDIX (PERTRIDGE), CIRCUS PYGARGUS (MONTEGU'S HARRIER) and various passeriformes of Community interest. The proposed conservation activities are supported by suitable surveillance, especially during summer, to control the public access, involving provincial Police Agents and GUARDIE ECOLOGICHE VOLONTARIE and promoting general information about the construction phases and the results obtained. In particular LEGAMBIENTE - CIRCOLO DI PIACENZA is taking care of the aspects concerned with the environmental education in schools and with local population.

Some illustrative panels set along the trails and near the areas subject of intervention (the biotope, the facilities using marine plants, the willow grove of Bobbio, the pine groves of Monte Armelio and the area of Pietra Parcellara) allow people to take self guided tour through the interesting sites.

Also protection huts for bird watching will be set in suitable positions near the moist zones realized by the project.