Nest survival and predation in Blue-fronted Parrots <i>Amazona aestiva</i>: effects of nesting behaviour and cavity characteristics

In this study we analyse factors affecting nest survival in Blue-fronted Parrots <i>Amazona aestiva</i> breeding in the Chaco region of northern Argentina. We combined temporal and environmental variables in order to determine which best explain variation in overall nest survival and in...

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Autores principales: Berkunsky, Igor, Segura, Luciano Noel, Aramburú, Rosana Mariel, Ruggera, Román Alberto, Svagelj, Walter Sergio, Reboreda, Juan Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Naturales
Zoología
Amazona aestiva
Breeding
MARK
Nest survival
Parrot
Predation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/98092
https://ri.conicet.gov.ar/11336/55222
http://www.bioone.org/doi/10.5253/arde.v104i2.a6
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-98092
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Zoología
Amazona aestiva
Breeding
MARK
Nest survival
Parrot
Predation
spellingShingle Ciencias Naturales
Zoología
Amazona aestiva
Breeding
MARK
Nest survival
Parrot
Predation
Berkunsky, Igor
Segura, Luciano Noel
Aramburú, Rosana Mariel
Ruggera, Román Alberto
Svagelj, Walter Sergio
Reboreda, Juan Carlos
Nest survival and predation in Blue-fronted Parrots <i>Amazona aestiva</i>: effects of nesting behaviour and cavity characteristics
topic_facet Ciencias Naturales
Zoología
Amazona aestiva
Breeding
MARK
Nest survival
Parrot
Predation
description In this study we analyse factors affecting nest survival in Blue-fronted Parrots <i>Amazona aestiva</i> breeding in the Chaco region of northern Argentina. We combined temporal and environmental variables in order to determine which best explain variation in overall nest survival and in predation dependent nest survival. We predicted that high and deep cavities, that are inaccessible to snakes and other predators, would have high daily survival rates. We compared the relative effects on nest survival of time of the breeding season, stage of the nesting cycle, and characteristics of the nest cavity. We modelled daily survival rate (DSR) for all observed nests, and daily survival rate for nests that had been predated (daily survival rate in relation to predation exclusively, DSR<sub>p</sub>). Nest predation accounted for 50% of nest failures. DSR was on average 0.989, translating into an apparent hatching success of 0.39. DSR decreased with time of breeding and increased with nest age. DSR<sub>p</sub> decreased with time of breeding and inclination of the nest cavity entrance hole and increased with height from the ground of the entrance hole. There was a quadratic effect of nest age on DSR<sub>p</sub>, such that daily survival was highest during incubation, lowest at hatching and the early nestling stage, but increasing throughout the remainder of the nestling stage. This effect became more pronounced as the breeding season advanced. Year and observer effects did not affect the probability of survival. Temporal patterns and characteristics of the nest cavity explained most of the variation in nest survival in Blue-fronted Parrots, which highlights the relevance of including these covariates in future studies of nest survival in parrots, and has important management and conservation implications.
format Articulo
Articulo
author Berkunsky, Igor
Segura, Luciano Noel
Aramburú, Rosana Mariel
Ruggera, Román Alberto
Svagelj, Walter Sergio
Reboreda, Juan Carlos
author_facet Berkunsky, Igor
Segura, Luciano Noel
Aramburú, Rosana Mariel
Ruggera, Román Alberto
Svagelj, Walter Sergio
Reboreda, Juan Carlos
author_sort Berkunsky, Igor
title Nest survival and predation in Blue-fronted Parrots <i>Amazona aestiva</i>: effects of nesting behaviour and cavity characteristics
title_short Nest survival and predation in Blue-fronted Parrots <i>Amazona aestiva</i>: effects of nesting behaviour and cavity characteristics
title_full Nest survival and predation in Blue-fronted Parrots <i>Amazona aestiva</i>: effects of nesting behaviour and cavity characteristics
title_fullStr Nest survival and predation in Blue-fronted Parrots <i>Amazona aestiva</i>: effects of nesting behaviour and cavity characteristics
title_full_unstemmed Nest survival and predation in Blue-fronted Parrots <i>Amazona aestiva</i>: effects of nesting behaviour and cavity characteristics
title_sort nest survival and predation in blue-fronted parrots <i>amazona aestiva</i>: effects of nesting behaviour and cavity characteristics
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/98092
https://ri.conicet.gov.ar/11336/55222
http://www.bioone.org/doi/10.5253/arde.v104i2.a6
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