Nest and eggs of the Masked water-tyrant (Fluvicola nengeta atripennis) parasited by the Shiny cowbird (Molothrus bonariensis) in Colombia
DOI:
https://doi.org/10.59517/oc.e519Keywords:
brood parasitism, Colombian Pacific, natural history, nidification, reproductionAbstract
The distribution of the Masked water-Tyrant (Fluvicola nengeta atripennis) extends from the northwestern end of Peru to the southwestern Pacific region of Colombia. In this paper, we present the description of the nest and eggs of F. n. atripennis, observations of defense and feeding behaviors, and the report of brood parasitism for this subspecies by the Shiny cowbird (Molothrus bonariensis) in at the Maragrícola Farm, Tumaco, Nariño -Colombia. We found five active nests with closed, globular shape and supported by the base, composed mainly of dry grasses, plastic and feathers, built at an average height of 34 ± 23.02cm above water level. The eggs of F. n. atripennis were white with small brown spots located mainly at the base. The average clutch size was 2.6 ± 0.57 with 66.6% for three-egg clutches. These characteristics observed in nests and eggs of F. n. atripennis are very similar to those of Fluvicola nengeta nengeta. Fluvicola nengeta atripennis expressed agonistic behaviors, based on exhibitions and persecutions for the protection of its nests against potential parasites, invaders and/or predators. We found 80% of F. n. atripennis nests with evidence of parasitism (eggs or chicks), with an average intensity of 1.3± 0.57. The parasite M. bonariensis implemented egg puncture as a strategy to reduce the host clutch. Finally, we emphasize the need to study the potential impact of brood parasitism on the reproductive success of this subspecies, and of the basic aspects, still scarcely studied, of its natural history.
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