期刊
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
卷 74, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/s00265-020-2807-4
关键词
Egyptian vultures; Feeding stations; Social interactions; Seasonal sociality; Social complexity
资金
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [SocForVul 659008]
- Marie Sklodowska-Curie Fellowship of the European Commission [747729]
- Programa de FPU del Ministerio de Educacion, Cultura y Deporte [FPU13/05429]
- Spanish Ministry of Economy and Competitiveness [REN 20001556 GLO, CGL2004-00270/BOS, CGL2009-12753-C02-02, CGL2012-40013-C02-01, CGL2015-66966-C2-1-2-R]
- EU/FEDER [REN 20001556 GLO, CGL2004-00270/BOS, CGL2009-12753-C02-02, CGL2012-40013-C02-01, CGL2015-66966-C2-1-2-R]
- Cabildo Insular de Fuerteventura
- Direccion General de Proteccion de la Naturaleza (Viceconsejeria de Medio Ambiente, Canarian Government)
Despite widespread occurrence of seasonal sociality among animals, little is still known about the social drivers and population-level social implications of seasonal grouping behaviours, especially in birds. Here, we studied the combined effects of ecological and social factors on seasonal grouping patterns in a sedentary population of Egyptian vultures living on the Eastern Canary Islands. We focussed on the social significance of large-scale gatherings taking place outside the breeding season at a highly preferred feeding station and a nearby temporary roost. Group sizes at this feeding patch followed a strong seasonal pattern characterized by distinct monthly changes in group composition, according to sex, age and territorial status. In between reproductive periods, vulture numbers at the feeding station may reach up 50% of the total population on a single day. GPS-tracking showed that this increase in vulture numbers was in part due to a shift in foraging range towards the centre of Fuerteventura by low-ranked territorial birds breeding in remote areas. During this period, vultures may spend on average 30% of their monthly time in a social gatherings context, depending on social status. We show that seasonal grouping patterns are shaped by the complex interplay between ecological factors (reproductive constraints, resource seasonality, food predictability), age-specific traits and social competitive processes, while social attraction may be an important additional component. We propose that for facultative social foragers living in highly despotic territorial systems, collective foraging may be of particular relevance regarding the development of hierarchical social relations and maintenance of population-level social cohesion.
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