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Primary and secondary sex-ratio in wild populations of Anodorhynchus leari (Birds, Psittacidae) and implications to populations dynamics

Grant number: 23/09771-1
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Start date: November 01, 2023
End date: July 31, 2024
Field of knowledge:Biological Sciences - Zoology
Principal Investigator:Luís Fábio Silveira
Grantee:Daniele Rodrigues Costa
Host Institution: Museu de Zoologia (MZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The Lear's Macaw Anodorhynchus leari (Bonaparte, 1856), is currently listed as "Endangered" by IUCN and ICMBio. Is endemic to northeastern Brazil, with its area of occurrence inserted in the morphoclimatic domain of the Caatinga, and the population concentrated in the Raso da Catarina and Depressão Sertaneja Meridional ecoregions. It's a long-lived and monogamous species, with late sexual maturity, and therefore, the number of individuals of each sex in the population acts as a limiting factor in the demography of the species. This study aims to verify the existence of sex-ratio biases of the offspring of natural populations of Lear's Macaw, and to investigate its implications for the population dynamics of the species.

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