INALI   02622
INSTITUTO NACIONAL DE LIMNOLOGIA
Unidad Ejecutora - UE
artículos
Título:
Reproductive Biology of Striated Heron (Butorides striata) in Argentina
Autor/es:
OLGUIN, PAMELA; BELTZER, ADOLFO; GIRAUDO, ALEJANDRO; REGNER, SILVIA; JUANI, MARCELO; VIANCO, MERCEDES; MARIANO EMILIANO; LORENZON, RODRIGO; LEON EVELINA
Revista:
WATERBIRDS (DE LEON SPRINGS, FLA.)
Editorial:
WATERBIRD SOC
Referencias:
Año: 2015 vol. 38 p. 396 - 400
ISSN:
1524-4695
Resumen:
The reproductive biology of the Striated Heron (Butorides striata) was studied in the lagoon of theReserve of the Universidad Nacional del Litoral, Santa Fe, Argentina, during two breeding seasons: September2012-February 2013 (n = 77) and September 2013-March 2014 (n = 125). All nests (n = 202) were built on waxy-leafnightshade (Solanum glaucophyllum) at 0.99 ± 0.27 m above water level. The incubation period was 20-23 (21.71 ±1.57) days; laying and hatching took place on successive days. An average of 2.63 ± 0.60 (Range = 2-4) opaque paleblue eggs were recorded per nest. Length, width and weight of eggs did not differ between seasons. Double (n =43) and triple (n = 47) broods were recorded. A total of 631 eggs were monitored; no differences were detectedin breeding, hatching, nesting, or fledging success between seasons. The time spent by chicks in the nest was 14.6± 2.16 days, and the average number of chicks per nest was 2.15 ± 0.55. Age-specific mortality rate for eggs was22% and 38% and for chicks 47% and 35% for the first and second seasons, respectively. Sixty-one percent of nestfailures were related to the disappearance of eggs or chicks from the nests, possibly due to predation or climaticfactors.Butorides striata) was studied in the lagoon of theReserve of the Universidad Nacional del Litoral, Santa Fe, Argentina, during two breeding seasons: September2012-February 2013 (n = 77) and September 2013-March 2014 (n = 125). All nests (n = 202) were built on waxy-leafnightshade (Solanum glaucophyllum) at 0.99 ± 0.27 m above water level. The incubation period was 20-23 (21.71 ±1.57) days; laying and hatching took place on successive days. An average of 2.63 ± 0.60 (Range = 2-4) opaque paleblue eggs were recorded per nest. Length, width and weight of eggs did not differ between seasons. Double (n =43) and triple (n = 47) broods were recorded. A total of 631 eggs were monitored; no differences were detectedin breeding, hatching, nesting, or fledging success between seasons. The time spent by chicks in the nest was 14.6± 2.16 days, and the average number of chicks per nest was 2.15 ± 0.55. Age-specific mortality rate for eggs was22% and 38% and for chicks 47% and 35% for the first and second seasons, respectively. Sixty-one percent of nestfailures were related to the disappearance of eggs or chicks from the nests, possibly due to predation or climaticfactors.n = 77) and September 2013-March 2014 (n = 125). All nests (n = 202) were built on waxy-leafnightshade (Solanum glaucophyllum) at 0.99 ± 0.27 m above water level. The incubation period was 20-23 (21.71 ±1.57) days; laying and hatching took place on successive days. An average of 2.63 ± 0.60 (Range = 2-4) opaque paleblue eggs were recorded per nest. Length, width and weight of eggs did not differ between seasons. Double (n =43) and triple (n = 47) broods were recorded. A total of 631 eggs were monitored; no differences were detectedin breeding, hatching, nesting, or fledging success between seasons. The time spent by chicks in the nest was 14.6± 2.16 days, and the average number of chicks per nest was 2.15 ± 0.55. Age-specific mortality rate for eggs was22% and 38% and for chicks 47% and 35% for the first and second seasons, respectively. Sixty-one percent of nestfailures were related to the disappearance of eggs or chicks from the nests, possibly due to predation or climaticfactors.Solanum glaucophyllum) at 0.99 ± 0.27 m above water level. The incubation period was 20-23 (21.71 ±1.57) days; laying and hatching took place on successive days. An average of 2.63 ± 0.60 (Range = 2-4) opaque paleblue eggs were recorded per nest. Length, width and weight of eggs did not differ between seasons. Double (n =43) and triple (n = 47) broods were recorded. A total of 631 eggs were monitored; no differences were detectedin breeding, hatching, nesting, or fledging success between seasons. The time spent by chicks in the nest was 14.6± 2.16 days, and the average number of chicks per nest was 2.15 ± 0.55. Age-specific mortality rate for eggs was22% and 38% and for chicks 47% and 35% for the first and second seasons, respectively. Sixty-one percent of nestfailures were related to the disappearance of eggs or chicks from the nests, possibly due to predation or climaticfactors.n =43) and triple (n = 47) broods were recorded. A total of 631 eggs were monitored; no differences were detectedin breeding, hatching, nesting, or fledging success between seasons. The time spent by chicks in the nest was 14.6± 2.16 days, and the average number of chicks per nest was 2.15 ± 0.55. Age-specific mortality rate for eggs was22% and 38% and for chicks 47% and 35% for the first and second seasons, respectively. Sixty-one percent of nestfailures were related to the disappearance of eggs or chicks from the nests, possibly due to predation or climaticfactors.n = 47) broods were recorded. A total of 631 eggs were monitored; no differences were detectedin breeding, hatching, nesting, or fledging success between seasons. The time spent by chicks in the nest was 14.6± 2.16 days, and the average number of chicks per nest was 2.15 ± 0.55. Age-specific mortality rate for eggs was22% and 38% and for chicks 47% and 35% for the first and second seasons, respectively. Sixty-one percent of nestfailures were related to the disappearance of eggs or chicks from the nests, possibly due to predation or climaticfactors.