The diet of Monk Parakeet Myiopsitta monachus nestlings in an urban area: a study using stable isotopes

• Published in: Bird study Vol. 68; no. 4; pp. 455 - 461
• Main Authors: Mazzoni, D., Pascual, J., Arroyo, L., Montalvo, T., González-Solís, J., Senar, J. C.
• Format: Journal Article
• Language: English
• Published: Thetford Taylor & Francis 02.10.2021; British Trust for Ornithology
• Subjects: Anthropogenic factors; Bayesian analysis; Diet; Food; Food availability; Food sources; Food supply; Indigenous species; Introduced species; Isotopes; Juveniles; Mathematical models; Myiopsitta; Myiopsitta monachus; Native organisms; Nitrogen isotopes; Population growth; Probability theory; Stable isotopes; Urban areas
• ISSN: 0006-3657; 1944-6705
• DOI: 10.1080/00063657.2022.2113856

Previous observations in Barcelona and other cities showed that approximately 40% of the food ingested by adult Monk Parakeets Myiopsitta monachus is of anthropogenic origin. Here we show that this type of food source is also used for feeding nestlings. To quantify the proportion of anthropogenic food within the diet of nestling Monk Parakeets, a non-native species in Barcelona. We analysed stable isotopes of 13 C and 15 N in feathers of Monk Parakeet nestlings collected in the Barcelona city area. We also sampled potential food sources ingested by Monk Parakeets to reconstruct the nestling diet using Bayesian mixing models with MixSIAR. Almost 30% of the nestlings' diet was composed of anthropogenic food. Since food availability is a major factor regulating population growth, we propose educating the general public to reduce the food supply for the species and ultimately limit its population growth.