Impact biological and economic to long term of various strategies of protection for the Montagu's Harrier

Many species that live in anthropic media in need of conservation programs. These sometimes are designed based on intuitive ideas or results in the short term, while the assessment of the effects to long term or economic sustainability of these is less frequent. The current program of conservation of the Montagu's Harrier (Circus pygargus) in Lleida, Catalonia, is intended to protect the nests of the destruction caused by the harvest of cereal through delay mowing of the plots where these nests; farmers are compensated financially by those actions. Them costs economic of said program have increased of form exponential along the time, due to the increase of the number of couples (as result of said program of conservation), as well as to a use each time more frequent of crops as the alfalfa or the cereal of irrigation, whose delay of mowing requires of offsets economic higher. This cost can currently compromising the sustainability of the conservation programme, which could have consequences on the population of Montagu. In this work we use models of population viability (PVA), trailers to analysis of cost-effectiveness, to identify management conservation scenarios that minimize the risk of this "trap of conservation", or at least that they minimize the expenditure in the medium term in such program. The results suggest that them programs of conservation based only in results to short term can not be them more appropriate, and show the relevance of have objectives of conservation to medium term clear.



Torres-Orozco, D., Arroyo, B., Rewag, M. & Santangeli, a. 2016. From conservation to conservation solutions traps: lessons from intensively managed Montagu completo harriers in Catalonia. Anim. Cons. (doi:10.1111/acv.12260)