Biologia Reproductiva Y Comportamientos De Cuidado Parental De Dos Especies De Atajacaminos De Córdoba, Argentina

Abstract

Breeding biology and parental care behaviors of two nightjar species of Córdoba, Argentina. – Nightjars are insectivorous birds whose mimetic coloration and night activity make them difficult to study. The aim of this study has been to describe aspects of the little-known breeding biology of Little Nightjar (Setopagis parvulus parvulus) and Band-winged Nightjar (Systellura longirostris patagonicus), two sympatric species in the Chaco Serrano formation of the province of Córdoba, Argentina. We observed great similarity in the nest and nesting site of the studied species, as well as in reproductive traits and parental care behaviors. Clutch size of both species was two eggs, and incubation (monitored with temperature sensors and direct observations) was provided mostly by females, whereas males shared the duties a few hours during the day. The incubation period lasted approximately 17 days, and percentage of nest attentiveness was high in both species (Little Nightjar incubated 92.81 ± 2.33% and Band-winged Nightjar incubated 92.39 ± 4.73% per day). No translocation of eggs was documented in any nest, but we observed movements of chicks away from the nest, at distances that increased progressively as the young aged. In both species, growth curves of chicks indicated a size difference between the chicks of the same nest, possibly associated to asynchronous hatching. This study contributes to the knowledge of life history strategies and reproductive behavior of Neotropical nightjars, which so far is limited and deserves future attention.

Aportes sobre Atajacaminos (Caprimulgidae) en la provincia de Salta, Argentina

“…Contenía dos huevos ligeramente elípticos, cuyas medidas en mm fueron 26.7 x 19.7 y 27.8 x 20.5. Cleere & Nurney (1998) mencionan que los huevos de esta especie miden 24.0-28.8 mm x 18.2-21.0 mm; Salvador & Bodrati (2013) mencionan promedios de 27.07 x 19.35 mm, con un rango de 25.6-28.3 x 18.7-20.1 mm (N= 14); y Schaaf et al (2015) indican un promedio de 26.7 x 19.9 mm (N= 34). Estas medidas coinciden con las que reportamos del nido de Salta, aunque difieren en la descripción de la coloración.…”

“…La publicación de numerosos artículos y trabajos relacionados a caprimúlgidos que mencionan novedades acerca de su nidificación (Krauczuk 2000, Pautasso & Cazenave 2002, Bodrati & Baigorria 2013, Salvador & Bodrati 2013, Salvador et al 2014, Schaaf et al 2015, alimentación (Bodrati & Cockle 2012, Bodrati & Salvador 2015, depredación (Fariña et al 2014), hábitos (Mazar Barnett et al 1998, Bodrati & Cockle 2012, Salvador & Bodrati 2013, nuevas localidades (Jaramillo 2000, Imberti 2001, Bodrati 2004, Bodrati & Klavins 2004, Marateo et al 2009, Bodrati & Cockle 2012, Krauczuk 2013) e incluso especies nuevas para el país (Krauczuk 2000, Bodrati & Areta 2010, demuestra que aun falta mucho por conocer sobre este grupo en la Argentina. Aportamos información obtenida durante noviembre de 2011 sobre nuevas localida-des, nidificación y dieta de tres especies de caprimúlgidos en la provincia de Salta, Argentina.…”