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Chapitre D'ouvrage Année : 2022

Breeding biology and demographic traits: Population parameters, Reproduction and Survival

Résumé

We summarize what is known about the variation in little bustard (Tetrax tetrax) vital parameters across its distribution range, regarding densities, breeding phenology, nesting and brooding, breeding success and sex ratio, as well as chick and adult survival. Breeding densities are highly variable, but generally higher in non-intensified farmland than in more natural steppes, with intensified farmland exhibiting the lowest values. Where it has been reported, breeding success is generally low, because of high nest losses and low chick survival, associated to farmland intensification. Adult survival is similarly low, mainly because of high human induced mortality factors. The low survival of adult females is particularly worrying and leads to an unbalanced adult sex ratio in most populations. While in some areas this female-biased mortality might be associated with the destruction of nests and females by farming practices, the exact mechanisms can be multifactorial and are not yet precisely understood. Quantitative unbiased demographic information remains scarce everywhere and we urgently need to improve the monitoring of little bustard populations across its range, particularly in the eastern populations, in Russia and Kazakhstan, where knowledge of the current breeding and demographic parameters is completely lacking.
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Dates et versions

hal-03048088 , version 1 (09-12-2020)

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S. Mañosa, G. Bota, Alexandre Villiers, Vincent Bretagnolle, M.B. Morales. Breeding biology and demographic traits: Population parameters, Reproduction and Survival. Little Bustard Ecology and Conservation, 5, Wildlife Research Monographs, Springer, Cham., pp.81-100, In press, 978-3-030-84902-3. ⟨10.1007/978-3-030-84902-3_5⟩. ⟨hal-03048088⟩
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