Biología reproductiva de la espátula rosada Platalea ajaja en Santa Fe, Argentina

SOVRANO, LORENA; BELTZER, ADOLFO; REGNER, SILVIA; LORENZON, RODRIGO; LEON, EVELINA; OLGUÍN, PAMELA; CEPPI, GUILLERMO ; ROCHA, ANTONIO

Revista Catalana d´ Ornitologia

Nat- Museu de Ciències Naturals de Barcelona

Lugar: Barcelona; Año: 2018

2340-3764

Reproductive biology of the Roseate Spoonbill Platalea ajaja in Santa Fe, ArgentinaThe reproductive biology of the Roseate Spoonbill Platalea ajaja was studied in the EcologicalReserve of the Universidad Nacional del Litoral, Santa Fe, (Argentina) in 2016. From Septemberonwards, five nests were monitored in a mixed colony. The nests were built on curupíSapium haematospermum and espinillo Acacia caven trees at 4.1 ± 0.7 m (mean ± SD) fromthe ground or the water surface. Clutch size was 3.6 ± 0.5 and hatching success 89%. Eggshad a maximum diameter of 64.6 ± 2.6 mm, a minimum diameter of 43.7 ± 1.3 mm, and anaverage volume of 62.9 ± 4.3 cm3 (n = 16). Egg weight at the beginning of incubation was69.4 ± 2.5 g (n = 9) but fell lineally to 59.6 ± 4.8 (n = 17) by the end of this period. Thebirth weight of nestlings was on average 43 g (n = 13). Most of nestlings died (6) or disappeared(4), presumably due to predation, and so fledgling success was low (1.2 chicks/nest).Nestlings showed a sigmoid growth curve, with a marked increase in weight in the second andthird weeks. The final body mass was reached at around eight weeks, somewhat later than thefledgling date at around day 27.