Living on the edge: Assessing the extinction risk of critically endangered Bonelli's eagle in Italy

Maurizio Sara', Pascual López-López

Risultato della ricerca: Article

10 Citazioni (Scopus)

Abstract

Background: The population of Bonelli’s eagle (Aquila fasciata) has declined drastically throughout its European range dueto habitat degradation and unnatural elevated mortality. There are less than 1500 breeding pairs accounted for in Europe,and the species is currently catalogued as Critically Endangered in Italy, where the 22 territories of Sicily, represent nearly95% of the entire Italian population. However, despite national and European conservation concerns, the species currentlylacks a specific conservation plan, and no previous attempts to estimate the risk of extinction have been made.Methodology/Principal Findings: We incorporated the most updated demographic information available to assess theextinction risk of endangered Bonelli’s eagle in Italy through a Population Viability Analysis. Using perturbation analyses(sensitivity and elasticity), and a combination of demographic data obtained from an assortment of independent methods,we evaluated which demographic parameters have more influence on the population’s fate. We also simulated differentscenarios to explore the effects of possible management actions. Our results showed that under the current conditions,Bonelli’s eagle is expected to become extinct in Italy in less than 50 years. Stand-alone juvenile mortality was the mostcritical demographic parameter with the strongest influence on population persistence with respect to other demographicparameters. Measures aimed at either decreasing juvenile mortality, adult mortality or decreasing both juvenile and adultmortality resulted in equivalent net positive effects on population persistence (population growth rate l.1). In contrast,changes aimed at increasing breeding success had limited positive effects on demographic trends.Conclusions/Significance: Our PVA provides essential information to direct the decision-making process and exposes gapsin our previous knowledge. To ensure the long-term persistence of the species in Italy, measures are urgently needed todecrease both adult mortality due to poaching and juvenile mortality due to nest plundering, the top ranking mortalitycauses.
Lingua originaleEnglish
pagine (da-a)1-10
Numero di pagine10
RivistaPLoS One
Volume7
Stato di pubblicazionePublished - 2012

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All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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