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Age mediates access to landfill food resources and foraging proficiency in a long-lived bird species
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Orientador(es)
Resumo(s)
Human activities have altered the availability of resources for wildlife. Landfill sites now provide
abundant and predictable anthropogenic food subsidies worldwide, sustaining increasing numbers of
opportunistic species and shaping their foraging behaviour. However, although individuals may differ in
their ability to use these resources, the factors influencing this variability within species are still poorly
known. Using GPS data from 68 adult and 67 juvenile white storks, Ciconia ciconia, tracked during their
premigratory periods between 2018 and 2020, we investigated whether age determines landfill attendance and the ability to compete for space and food. Additionally, using video recordings of 165 adults
and 124 juveniles obtained in the 2020 premigratory period, we investigated whether age influences
landfill foraging proficiency and dominance over resources. Adult storks visited landfills on 57% of the
days, while juveniles only visited landfills on 29% of the days. There was strong competition for food at
landfills, with adults exerting dominance over juveniles, foraging predominantly in areas with higher
food availability and outcompeting juveniles in food acquisition. Juveniles had significantly lower food
intake rates in the best foraging areas and showed less aggressiveness, being forced to use adjacent lower
quality areas. Overall, juveniles had limited access to landfill resources, suggesting that landfill diet
specialization is mediated by age-related improvements in foraging expertise and increased competitiveness developed during maturation. Thus, landfill use is shaping foraging strategies and species
behaviour from an early age, with potential consequences for population dynamics.
Descrição
Palavras-chave
competition food waste foraging behaviour predictable anthropogenic food subsidies white stork
Contexto Educativo
Citação
Martins, B.H., Soriano-Redondo, A., Franco, A.M.A., Catry, I. Age mediates access to landfill food resources and foraging proficiency in a long-lived bird species, Animal Behaviour, Volume 207, 2024, Pages 23-36
Editora
Elsevier