Abstract
Delayed dispersal is mediated by a trade-off between pursuing an immediate reproductive opportunity by a mature young and securing benefits of parental care for a longer period. While these natal dispersal patterns are widely known for birds in the north temperate region, details regarding the life history in the neotropical region are still scarce. We present here incidental data on the maximum dispersal distances of banded juveniles from two populations of the rufous hornero (Furnarius rufus), a bird species known for its delayed juvenile dispersal behavior. These events occurred in either the pre-breeding or breeding seasons, most likely 11–13 months after hatching. Upon dispersal, juveniles formed pairs, and established their own territories at varying distances from the centers of their natal territory: 82 m (dispersal male), 383 m (female), and 401 m (unknown sex). These new territories were defended for at least 4 months (female) and 6 months (male), although the female briefly paired for 19 days to 2 months before establish her last observed territory. Short-distance dispersal may be a result of limited vacant territories, reduced predation risk, and/or maintenance of dear enemy relationships with familiar individuals. Future studies based in advanced methods can track more individuals and assess the persistence of these patterns in contrast with our small sample size.
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Acknowledgements
The ICMBio (SISBIO nos. 69700 and 40806–1), CEMAVE (nos. 4426 and 3886) and the local ethics committee (CEUA/UFJF - no. 027/2019) for allowing all fieldwork. Authors thank Mr. Wyller (Dia de Bola social cultural esportivo) and Mr. Glauco (SESI Campestre) that kindly allowed the study within the properties they respectively own and manage. Authors are also in debt with many fieldwork volunteer assistants: Daniel Oliveira, Fábio Palacio, Paula Neto, Mariana Oliveira, Polônia Nunes, Lucas Morgado, and Clarissa Vidal. Funded parts of this study the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Código Financeiro 001 to PSA and Postdoctoral fellowship to PD under grant number 88887.469218/2019-00, the Association of Field Ornithologists through an E. Alexander Bergstrom Memorial Research Award and the Animal Behavior Society through an ABS Student Research Grant.
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PSP: Conceptualization; Investigation; Data curation; For-mal analysis; Writing– original draft; Writing– review & editing. ACG: Methodology; Resources; Writing– original draft; Writing– review & editing; Supervision. PD: Methodology; Resources; Investigation; Formal analysis; Writing– original draft; Writing– review & editing.
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Communicated by Luiz dos Anjos.
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Amorim, P.S., Guaraldo, A.C. & Diniz, P. Unveiling juvenile dispersal distances in the rufous hornero: observational notes. Ornithol. Res. (2024). https://doi.org/10.1007/s43388-024-00174-4
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DOI: https://doi.org/10.1007/s43388-024-00174-4