Permebilization of infrastructures




   The current LIFE-Lince project has been a major qualitative step forward in defragmentation, since actions on all paved roads in Doñana-Aljarafe have been properly designed as a whole. It is now intended that the Iberian lynx find passes from meters before reaching the paved road, leading the Iberian lynx to areas of intersection. For this, the Regional Ministry of Public Works joined as a partner LIFE-Lynx (2006-2011).


   Since 2006, thanks to the search for evidence around the roads, it devised a series of priority connection areass to protect (the preferred areas of movement of lynx). This project began drafting a precaution, connecting all population centers with each other (acting on roads and highways in unison). Normally, wildlife passes are not fully effective until months later it was built, when channeled back vegetation recovers, but there are two cases of preventive areas that have been used a few days after the work was finished, denoting the proper placement and execution of the structure.


   Based on the signs of lynx presence, the structure of the landscape and topography of the route, the best solution economically and technically possible for each situation has been suggested.


-       Forest roads: the biggest problem encountered has been the high speed of traffic. The design has dominated the landscape integration and reforested to safe areas. Fences have always avoided that the user move away from the mountain. To decrease the speed bumps have been used mainly trapezoidal reflectors abuse preventive perimeter and clearing of vegetation. He has acted in two ways: 

1.    Arrayán Road (Las Pardillas): The measures taken are allowing residents lynx crossing the abuse without registering losses for years.

 2.    HF-6245 (intermediate section between Cabezudos and the Natural Park): In addition to peacekeeping measures were inserted 4 wildlife crossings and 2 bridges were conditioned with dry banks to be used in times of flood water. Being used by residents and by dispersing without registering abuses since then.


-       Roads: once marked the routes most likely from the nucleus, we worked on direct them to wildlife crossings. To do this, in 2007, took place in the road between El Rocio in Matalascañas (A-483), an enclosure channeled to crossing structures. Have also been completed in this period wildlife passages 5 to 7 meters wide at the A-494, which currently are being channeled union with enclosure. Points detected in transit have been built over two ecoducts, overpasses used exclusively for wildlife. They have 15 m wide at its narrowest point, appearing as a dune. Its width makes it more attractive and useful for most species. Just a month after installation, and detected the first use of the Iberian lynx. Are also adapting drains all the streams that give exit to the north in the pathways linking up batteries Almonte (A-474) and from Hinojos to A-49. They create edge treatment is dry and the vegetation that facilitates the use of these bridges for wildlife. In routine monitoring is done of all structures, it has been shown that these bridges are invalid and bobcats use them to their movements. Finally, under construction two wildlife crossings on the stretch Hinojos Almonte to the A-474 will facilitate the exit of the core array to the north, with a fence that directs these two wildlife crossings and drainage pre- existing in the area. Bridges and major drainage of the roads linking with Rociana Almonte and even Bonares adjustments are under similar sections in all of them have been placed in 2009 reflectors preventive outrage.



Two Iberian lynxes crossing a road by a fauna underpass built by the LIFE-Lince project.  View of an ecoduct in the Doñana-Aljarafe area, a few days after its construction. Even though the vegetation is still lacking, it has already been used by the lynx.


   Since 2007 there has been a 63.1% reduction in the incidence of death from abuses of the total population of Doñana Aljarafe, from an average mortality in the period 2002-2006 of 7.1% of total of individuals, a violation means of 2.6% of the total population in 2006-2010. Moreover, these losses are not preventing the abuses of population growth today. The expansion in the range of the Iberian lynx still needs of further corrections. Currently, continue to evaluate the changes in the distribution of the species to propose and implement road improvements to limit abuses mortality and improve the connection between cores and populations.





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