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Rainfall and population dynamics of Grey Pileated Finch Coryphospingus pileatus (Aves: Passeriformes) in a Neotropical dry forest

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Population Ecology

Abstract

In tropical dry environments rainfall periodicity may affect demographic parameters, resulting in fluctuations in bird abundance. We used capture–recapture data for the Grey Pileated Finch from a Neotropical dry forest to evaluate the hypothesis that intra- and inter-annual survival, individuals entrance and population abundance, are related to local rainfall. Sampling occurred across 3 years, with individuals captured, tagged and evaluated for age and presence of brood patch every 14 days. Using the POPAN formulation, we generated demographic models to evaluate study population temporal dynamics. Best-fit models indicated a low apparent annual survival in the first year (16%) compared to other years (between 47 and 62%), with this low value associated with an extreme drought. The abundance of juveniles at each capture occasion was significantly dependent on the accumulated precipitation in the previous 14 days, and the juvenile covariate was a strong predictor of the intra-annual entrance probability (natality). Individuals entrance during the reproductive period corresponded to 53, 52 and 75% of total ingress for each year, respectively. The trend in sampled population size indicated positive exponential growth (Ninitial = 50, Nlast = 600), with intra-annual fluctuations becoming progressively more intense. Low survival was relevant during population decline at study onset, while at study end intense Individuals entrance promoted rapid population growth. Thus, the indirect effects of rainfall and the combined effect of two demographic rates operated synergistically on the immediate population abundance of Grey Pileated Finch, an abundant bird in a Neotropical dry forest.

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Fig. 1

Data from CEMADEN—Centro Nacional de Monitoramento e Alertas de Desastres Naturais and INMET—Instituto Nacional de Meteorologia

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Acknowledgements

We thank the graduate and post-graduate students of the Laboratory of Population Ecology at the Universidade Federal Rural do Semiárido for their help with field work. This work was supported by Universidade Federal Rural do Semi-Árido, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, and Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (undergraduate and postgraduate grants) and, CNPq (442524/2014-5) and Fundação de Apoio à Pesquisa do Rio Grande do Norte—FAPERN (005/2011/PPPIV/57) (research grants). Adrian Barnett helped with the English.

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Authors and Affiliations

  1. Programa de Pós-graduação em Ecologia e Conservação, Universidade Federal Rural do Semi-árido, UFERSA, Mossoró, Brazil

    Pedro Teófilo Silva de Moura, Clarisse Carolina de Oliveira Silva & Liana Monique Paiva Cavalcante

  2. Centro de Ciências Biológicas e da Saúde, Universidade Federal Rural do Semi-árido, UFERSA, Mossoró, Brazil

    Luciana Vieira de Paiva & Leonardo Fernandes França

  3. Departamento de Botânica, Ecologia e Zoologia, Universidade Federal do Rio Grande do Norte, UFRN, Natal, Brazil

    Mauro Pichorim

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  1. Pedro Teófilo Silva de Moura
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  2. Luciana Vieira de Paiva
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  3. Clarisse Carolina de Oliveira Silva
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  6. Leonardo Fernandes França
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Correspondence to Leonardo Fernandes França.

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This study was authorized by Chico Mendes Institute for Biodiversity Conservation, authorizations from 34620-1 to 34620-8, and Research Centre for the Conservation of Wild Birds, authorizations from 3565-1 to 3565-5, who provided the metal rings and issued permits for scientific research in the natural environments studied.

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Table 2 Set of all 32 candidates models ranked according to the Akaike Information Criteria (AICc)
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de Moura, P.T.S., de Paiva, L.V., de Oliveira Silva, C.C. et al. Rainfall and population dynamics of Grey Pileated Finch Coryphospingus pileatus (Aves: Passeriformes) in a Neotropical dry forest. Popul Ecol 60, 223–235 (2018). https://doi.org/10.1007/s10144-018-0624-7

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