Abstract

FRAGOSO, Carlos; SOSA, Vinicio J.  and  ROJAS, Patricia. Nesting behavior of the Elegant Euphonia (Euphonia elegantissima, Aves: Fringillidae) in urban and suburban sites of east Mexico. Acta Zool. Mex [online]. 2021, vol.37, e3712365.  Epub Sep 27, 2021. ISSN 2448-8445.  https://doi.org/10.21829/azm.2021.3712365.

Between 2005, 2014-2017, we studied six Elegant Euphonia (Euphonia elegantissima) nests from two sites (urban and suburban) in the city of Xalapa, Veracruz. They were located in a macadamia tree crown, under epiphytic bromeliads, and under hanging fern and Euphorbia pots. The two nests we extracted and measured (7.2 x 7.5 x 5.6 cm; 10.1 x 8.6 x 11 cm), were closed and globular, with a lateral entry and mainly made of plant fibers, leaves, and cobwebs. Our observations included nest construction, egg incubation and chick care (nestling phase). Nest construction took at least 10-11 days, while egg incubation took 14-18 days. Incubation was done by the female in all but one observation, and the male escorted the female to the nest on every occasion. Time of incubation sessions ranged from 36-88 min (mean = 62 min) with shorter out nest sessions (3-18 min, mean = 9 min). There were three eggs in two of the nests, and in one only two eggs hatched; four chicks were observed in another nest. The nestling phase lasted 20 days in two nests, with the male spending more time (35-300 s, mean = 109 s) than the female taking care of the chicks (25-99 s, mean = 53 s). Reciprocal escorting was observed during the nestling phase, with the male always arriving first. Breeding occurred in January, April, May (two nests), June, and July. Observing the male of the Elegant Euphonia escorting the female during the incubation period, corroborates previous observations of this behavior in genera Euphonia and Chlorophonia. Incubation and nestling time periods were similar to other species of these genera.

Keywords : egg incubation; escort behavior; fledgling; nests; tropical birds.