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- Title
Célibataires chez la Pie-grièche écorcheur Lanius collurio.
- Authors
Zollinger, Jean-Luc
- Abstract
In any bird community, the total population comprises a breeding fraction and a single fraction: in the latter, we counted, between 1996 and 2022, the single males and females of Red-backed Shrike present in a 30 km² area, in the breeding territories TR (after 15 June); we found an average of 83.5% breeding pairs, 16.1% single males and 0.4% single females. The total population of TR housed an annual average of 96.7 territories, 81.4 of which were occupied by breeding pairs and 15.3 by single males: the abundance of single males is weakly associated with the total number of TRs, is not very dependent on the intensity of the search effort, but is positively associated with the total number of favourable territories and with the number of single males in a favourable territory. The majority of breeding pairs are naturally found in favourable territories: the greater their number, the fewer single males are observed; the number of single males visiting favourable territories, which was significant in the first half of the study, has been declining since 2016. Single males are no longer perceived as annoying competitors to the residents: they act as a buffer, which is essential for the stability and persistence of the total population, and can be a warning of the dwindling population.
- Subjects
RED-backed shrike; BIRD breeding; BIRD communities; BIRD populations; BIRDS
- Publication
Nos Oiseaux, 2024, Vol 71, Issue 2, p105
- ISSN
0029-3725
- Publication type
Article