miércoles, 11 de enero de 2017

New publication on Egyptian vulture demographic parameters!

Sanz-Aguilar, A., Cortés-Avizanda, A., Serrano, D., Blanco, G., Ceballos, O., Grande, J.M., Tella, J.L., Donázar, J.A.: Sex- and age-dependent patterns of survival and breeding success in a long-lived endangered avian scavenger. Scientific Report, 7 2017 Article number 40204, doi: 10.1038/srep40204

 Abstract. In long-lived species, the age-, stage- and/or sex-dependent patterns of survival and reproduction determine the evolution of life history strategies, the shape of the reproductive value, and ultimately population dynamics. We evaluate the combined effects of age and sex in recruitment, breeder survival and breeding success of the globally endangered Egyptian vulture (Neophron percnopterus), using 31-years of exhaustive data on marked individuals in Spain. 

Photo: J. Bas

Mean age of first reproduction was 7-yrs for both sexes, but females showed an earlier median and a larger variance than males. We found an age-related improvement in breeding success at the population level responding to the selective appearance and disappearance of phenotypes of different quality but unrelated to within-individual aging effects. Old males (≥8 yrs) showed a higher survival than both young males (≤7 yrs) and females, these later in turn not showing aging effects. Evolutionary trade-offs between age of recruitment and fitness (probably related to costs of territory acquisition and defense) as well as human-related mortality may explain these findings. Sex- and age-related differences in foraging strategies and susceptibility to toxics could be behind the relatively low survival of females and young males, adding a new concern for the conservation of this endangered species.

lunes, 12 de diciembre de 2016

viernes, 9 de diciembre de 2016

Ph.D. defense !

Andreu Rotger has
successfully defended his Ph.D. Thesis titled "Evolutionary Ecology of the Balearic Wall Lizard Podarcis lilfordi" at the University of Barcelona the 30th of November. Visca Andreu ! (Dr. Rotger from now).

viernes, 25 de noviembre de 2016

The Capture-Recapture-Recovery Workshop 2016 has ended : see you next year !

It has been an occasion to share thoeretical and practical aspects of CMR analyses, to learn about snails, feral cats, tropical frogs & Co.  See you next year, last week of November! (visit also our facebook page)

martes, 15 de noviembre de 2016

Gull Shopping

Photo: Björn Marten Philipps
Björn Marten Philipps from the Wadden Sea Conservation Station was visiting Palma when bumped into our GSM/GPS equipped gull shopping and scavenging at the Mercat de l'Olivar. 

Thank you very much for the picture, Björn

lunes, 7 de noviembre de 2016

Profesionales abstrusos, modelos complejos y conservación

La relación entre gestores de la conservación y académicos

Hace unos meses Joan Mayol, en uno de sus ensayos que regularmente publica en Quercus, afirmaba que "la conservación de la naturaleza le debe mucho a gente como Julio Verne, Emilio Salgari, Jack London o Miguel Delibes, mucho más que a algunos profesionales abstrusos que diseñan complejos modelos que les permiten pontificar y pretender elevarse sobre el común de los mortales". Anoto aquí que abstruso, según la RAE, significa "De difícil comprensión". Yo soy muy poco corporativista, pero me molestó tanto eso del "pontificar y pretender elevarse sobre el común de los mortales" que decidí escribir una réplica al Quercus, que aparece aquí abajo. Muchos académicos no somos pontífices, ni pretendemos elevarnos por encima de nadie. Y aquí me paro que me embalo.