Nests, eggs, and nestlings of Spix’s Warbling-Antbird (Hypocnemis striata) in Anapu, Pará, Brazil

Abstract

We describe nests, eggs, and nestlings of Spix’s Warbling-Antbird (Hypocnemis striata) from terra firme dense forest in the municipality of Anapu, state of Pará. We found two nests in April 2016 with a basket-shaped structure, attached to the horizontal fork by thin branches, made with a mixture of vines and dry leaves. Nests and eggs follow the same pattern observed for other species in the genus Hypocnemis. Nests’ dimensions were as follows: external height 112.5 mm (nest 1) and 95.4 mm (nest 2); outside diameter 79 mm (1) and 61.4 mm (2); internal diameter 42.4 mm (1) and 32.7 mm (2); internal depth 70 mm (1) and 62 mm (2); and height in relation to the ground 60 cm (1) and 145 cm (2). The eggs are rosy with reddish-brown spots scattered all over it, with greater concentration in the terminal portion of the wider pole. During field observations and recording hours (196 min) in one nest, only the male was observed taking care of the nestlings. Although we only performed these observations for a short period, this behavior apparently differs from the pattern usually observed for other Thamnophilidae, in which both sexes engage in parental care; nevertheless, this preliminary result is not conclusive. Some aspects of the reproductive biology of the species, such as incubation period and nestling development, could not be obtained and should be subject of further investigation.

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Acknowledgments

We thank Anderson Rodrigues Tomás for discovering one of the nests. We also thank Biota Projetos e Consultoria Ambiental LTDA and Norte Energia S/A for financial resources and logistical support for this research.

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Funding

Funding was provided by Biota Projetos e Consultoria Ambiental LTDA and Norte Energia S.A. during environmental monitoring in UHE Belo Monte, Vitória do Xingu, Pará, Brazil.

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Contributions

K.M.L. and T.G.J. carried out all observations in the field, and photographed and identified the specimen. K.M.L., J.P., and M.A. wrote the manuscript. M.A. translated the draft.

Corresponding author

Correspondence to Tiago Guimarães Junqueira.

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The authors declare that they no conflict of interest.

Research involving human participants and/or animals

IBAMA ACCTMB 251/2013

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Additional information

Communicated by Alexandre Aleixo

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Lara, K.M., Junqueira, T.G., Aragona, M. et al. Nests, eggs, and nestlings of Spix’s Warbling-Antbird (Hypocnemis striata) in Anapu, Pará, Brazil. Ornithol. Res. 28, 229–232 (2020). https://doi.org/10.1007/s43388-021-00032-7

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Keywords

  • Amazon forest
  • Behavior
  • Reproduction
  • Thamnophilidae
  • Xingu River