2024-03-28T15:53:26Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1469582022-12-21T15:35:47Zcom_10261_77com_10261_8col_10261_330
Palacín, Carlos
Martín, Beatriz
Onrubia, Alejandro
Alonso, Juan Carlos
2017-03-17T11:24:24Z
2017-03-17T11:24:24Z
2016-03-22
Endangered Species Research 30: 73-82 (2016)
http://hdl.handle.net/10261/146958
10.3354/esr00726
We studied the dynamics and trend of the last extant population of great bustards Otis tarda in Africa. Moroccan great bustards are the southernmost population of this species, and thus show the characteristics of a peripheral population: small size, isolation and low gene flow. Available counts indicate a severe population decline (62% in the last 15 yr), as well as a contraction of the species' distribution. We used a population viability analysis (PVA) to evaluate the quasi-extinction risk and to identify the most important threats. The estimated geometric growth rate of the more realistic of a set of possible scenarios was 0.87 (95% CI: 0.85, 0.89). This implies a 13% annual decline over 50 yr. However, projections derived from these results should be interpreted with caution, because models have a great deal of uncertainty and vital rates from Iberian populations may be different from those of the Moroccan population. PVA showed the negative consequence of human-induced mortality. According to the model that best fits our census data and if present threats remain in the coming years, this peripheral population could go extinct in ca. yr. Agricultural intensification, infrastructure developments and new power lines in rural areas where the species occurs are causing habitat destruction and fragmentation and increasing artificial mortality. Urgent conservation measures, especially to reduce human-induced mortality, are needed to save African great bustards from extinction. We suggest that these findings can be generalized to other peripheral great bustard populations living in highly humanized landscapes.
eng
https://creativecommons.org/licenses/by-nc/4.0/
openAccess
Farmland birds
Bustards
Morocco
Peripheral population
Global change
Extinction
Assessing the extinction risk of the great bustard Otis tarda in Africa
artículo