Links between fear of humans, stress and survival support a non-random distribution of birds among urban and rural habitats

Scientific Reports
Natalia Rebolo-IfránJosé L Tella

Abstract

Urban endocrine ecology aims to understand how organisms cope with new sources of stress and maintain allostatic load to thrive in an increasingly urbanized world. Recent research efforts have yielded controversial results based on short-term measures of stress, without exploring its fitness effects. We measured feather corticosterone (CORTf, reflecting the duration and amplitude of glucocorticoid secretion over several weeks) and subsequent annual survival in urban and rural burrowing owls. This species shows high individual consistency in fear of humans (i.e., flight initiation distance, FID), allowing us to hypothesize that individuals distribute among habitats according to their tolerance to human disturbance. FIDs were shorter in urban than in rural birds, but CORTf levels did not differ, nor were correlated to FIDs. Survival was twice as high in urban as in rural birds and links with CORTf varied between habitats: while a quadratic relationship supports stabilizing selection in urban birds, high predation rates may have masked CORTf-survival relationship in rural ones. These results evidence that urban life does not constitute an additional source of stress for urban individuals, as shown by their near identical CORTf val...Continue Reading

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Citations

Jun 24, 2016·Conservation Physiology·Sara A BerkCreagh W Breuner
Aug 9, 2016·Scientific Reports·Martina CarreteJosé L Tella
Jan 19, 2018·The Journal of Heredity·Christopher J Schell
Mar 1, 2019·Scientific Reports·Álvaro LunaMartina Carrete
Feb 2, 2019·Frontiers in Psychology·Mauricio R PapiniAndrés M Pérez-Acosta
May 18, 2018·Proceedings. Biological Sciences·Jakob C MuellerBart Kempenaers
Jan 9, 2019·Ecology and Evolution·Christopher J SchellJill M Mateo
Sep 13, 2017·Journal of Evolutionary Biology·Y Jiang, A P Møller
Oct 8, 2020·Proceedings. Biological Sciences·Maider Iglesias-CarrascoMegan L Head
Jan 10, 2021·Scientific Reports·Álvaro LunaMartina Carrete
Feb 6, 2021·Scientific Reports·Breanna J PutmanGregory B Pauly
Mar 27, 2021·Evolutionary Applications·Adrián Baños-VillalbaPim Edelaar

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