Nest Survival and Predation in Blue-Fronted Parrots Amazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics

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In this study we analyse factors affecting nest survival in Blue-fronted Parrots Amazona aestiva 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...

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Detalles Bibliográficos
Autores principales: Berkunsky, I., Segura, L.N., Aramburú, R.M., Ruggera, R.A., Svagelj, W.S., Reboreda, J.C.
Formato: JOUR
Materias:
Amazona aestiva
breeding
MARK
nest survival
parrot
predation
bird
breeding season
nesting behavior
nesting success
reproductive behavior
survival
Argentina
Chaco [Argentina]
Psittacidae
Serpentes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03732266_v104_n2_p143_Berkunsky
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03732266_v104_n2_p143_Berkunsky
record_format dspace
spelling todo:paper_03732266_v104_n2_p143_Berkunsky2023-10-03T15:30:14Z Nest Survival and Predation in Blue-Fronted Parrots Amazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics Berkunsky, I. Segura, L.N. Aramburú, R.M. Ruggera, R.A. Svagelj, W.S. Reboreda, J.C. Amazona aestiva breeding MARK nest survival parrot predation bird breeding season nesting behavior nesting success predation reproductive behavior survival Argentina Chaco [Argentina] Amazona aestiva Psittacidae Serpentes In this study we analyse factors affecting nest survival in Blue-fronted Parrots Amazona aestiva 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, DSRp). 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. DSRp 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 DSRp, 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. Fil:Segura, L.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Svagelj, W.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Reboreda, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03732266_v104_n2_p143_Berkunsky
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Amazona aestiva
breeding
MARK
nest survival
parrot
predation
bird
breeding season
nesting behavior
nesting success
predation
reproductive behavior
survival
Argentina
Chaco [Argentina]
Amazona aestiva
Psittacidae
Serpentes
spellingShingle Amazona aestiva
breeding
MARK
nest survival
parrot
predation
bird
breeding season
nesting behavior
nesting success
predation
reproductive behavior
survival
Argentina
Chaco [Argentina]
Amazona aestiva
Psittacidae
Serpentes
Berkunsky, I.
Segura, L.N.
Aramburú, R.M.
Ruggera, R.A.
Svagelj, W.S.
Reboreda, J.C.
Nest Survival and Predation in Blue-Fronted Parrots Amazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics
topic_facet Amazona aestiva
breeding
MARK
nest survival
parrot
predation
bird
breeding season
nesting behavior
nesting success
predation
reproductive behavior
survival
Argentina
Chaco [Argentina]
Amazona aestiva
Psittacidae
Serpentes
description In this study we analyse factors affecting nest survival in Blue-fronted Parrots Amazona aestiva 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, DSRp). 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. DSRp 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 DSRp, 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 JOUR
author Berkunsky, I.
Segura, L.N.
Aramburú, R.M.
Ruggera, R.A.
Svagelj, W.S.
Reboreda, J.C.
author_facet Berkunsky, I.
Segura, L.N.
Aramburú, R.M.
Ruggera, R.A.
Svagelj, W.S.
Reboreda, J.C.
author_sort Berkunsky, I.
title Nest Survival and Predation in Blue-Fronted Parrots Amazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics
title_short Nest Survival and Predation in Blue-Fronted Parrots Amazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics
title_full Nest Survival and Predation in Blue-Fronted Parrots Amazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics
title_fullStr Nest Survival and Predation in Blue-Fronted Parrots Amazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics
title_full_unstemmed Nest Survival and Predation in Blue-Fronted Parrots Amazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics
title_sort nest survival and predation in blue-fronted parrots amazona aestiva: effects of nesting behaviour and cavity characteristics
url http://hdl.handle.net/20.500.12110/paper_03732266_v104_n2_p143_Berkunsky
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