Factors affecting the probability of double brooding by Southern House Wrens

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Seasonal fecundity of birds is influenced by clutch sizes and the number of successful breeding attempts during a breeding season. As such, understanding the factors that determine the decision to initiate multiple broods within a season and the consequences of this reproductive tactic is important....

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Autores principales: Carro, M.E., Mermoz, M.E., Fernández, G.J.
Formato: JOUR
Materias:
Environmental factors
Fecundity
Lifetime productivity
Nesting success
Reproductive effort
Troglodytes aedon musculus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02738570_v85_n3_p227_Carro
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02738570_v85_n3_p227_Carro
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spelling todo:paper_02738570_v85_n3_p227_Carro2023-10-03T15:15:53Z Factors affecting the probability of double brooding by Southern House Wrens Carro, M.E. Mermoz, M.E. Fernández, G.J. Environmental factors Fecundity Lifetime productivity Nesting success Reproductive effort Troglodytes aedon musculus Seasonal fecundity of birds is influenced by clutch sizes and the number of successful breeding attempts during a breeding season. As such, understanding the factors that determine the decision to initiate multiple broods within a season and the consequences of this reproductive tactic is important. We examined the frequency of double brooding by Southern House Wrens (Troglodytes aedon musculus) in eastern Argentina. We analyzed inter- and intraseasonal variation in double brooding and evaluated the effect of weather conditions and laying date on the frequency and occurrence of this behavior. Finally, we assessed the effect of double brooding on the seasonal and lifetime productivity of female Southern House Wrens. During our 8-year study, we found that ∼43% (range = 17-83% each year) of breeding pairs attempted a second brood after successfully raising a first brood. The probability of females having a second brood was affected by the laying date of the first nesting attempt, but was independent of the number of young fledged. About 65% of females that started laying eggs before the first quarter of each breeding season produced a second brood, and this percentage decreased to ∼40% after this period. In addition, variation in double-brooding frequency among years was related to weather conditions, with the proportion of pairs double brooding increasing with increased precipitation early in the breeding season. More precipitation likely contributed to an increase in insect abundance. Although double brooding increased the seasonal and lifetime productivity of female Southern House Wrens, additional study of the survival and fate of fledglings from first and second broods is needed to assess the importance of multi-brooding in the reproductive success of these wrens. © 2014 Association of Field Ornithologists. Fil:Carro, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mermoz, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fernández, G.J. 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_02738570_v85_n3_p227_Carro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Environmental factors
Fecundity
Lifetime productivity
Nesting success
Reproductive effort
Troglodytes aedon musculus
spellingShingle Environmental factors
Fecundity
Lifetime productivity
Nesting success
Reproductive effort
Troglodytes aedon musculus
Carro, M.E.
Mermoz, M.E.
Fernández, G.J.
Factors affecting the probability of double brooding by Southern House Wrens
topic_facet Environmental factors
Fecundity
Lifetime productivity
Nesting success
Reproductive effort
Troglodytes aedon musculus
description Seasonal fecundity of birds is influenced by clutch sizes and the number of successful breeding attempts during a breeding season. As such, understanding the factors that determine the decision to initiate multiple broods within a season and the consequences of this reproductive tactic is important. We examined the frequency of double brooding by Southern House Wrens (Troglodytes aedon musculus) in eastern Argentina. We analyzed inter- and intraseasonal variation in double brooding and evaluated the effect of weather conditions and laying date on the frequency and occurrence of this behavior. Finally, we assessed the effect of double brooding on the seasonal and lifetime productivity of female Southern House Wrens. During our 8-year study, we found that ∼43% (range = 17-83% each year) of breeding pairs attempted a second brood after successfully raising a first brood. The probability of females having a second brood was affected by the laying date of the first nesting attempt, but was independent of the number of young fledged. About 65% of females that started laying eggs before the first quarter of each breeding season produced a second brood, and this percentage decreased to ∼40% after this period. In addition, variation in double-brooding frequency among years was related to weather conditions, with the proportion of pairs double brooding increasing with increased precipitation early in the breeding season. More precipitation likely contributed to an increase in insect abundance. Although double brooding increased the seasonal and lifetime productivity of female Southern House Wrens, additional study of the survival and fate of fledglings from first and second broods is needed to assess the importance of multi-brooding in the reproductive success of these wrens. © 2014 Association of Field Ornithologists.
format JOUR
author Carro, M.E.
Mermoz, M.E.
Fernández, G.J.
author_facet Carro, M.E.
Mermoz, M.E.
Fernández, G.J.
author_sort Carro, M.E.
title Factors affecting the probability of double brooding by Southern House Wrens
title_short Factors affecting the probability of double brooding by Southern House Wrens
title_full Factors affecting the probability of double brooding by Southern House Wrens
title_fullStr Factors affecting the probability of double brooding by Southern House Wrens
title_full_unstemmed Factors affecting the probability of double brooding by Southern House Wrens
title_sort factors affecting the probability of double brooding by southern house wrens
url http://hdl.handle.net/20.500.12110/paper_02738570_v85_n3_p227_Carro
work_keys_str_mv AT carrome factorsaffectingtheprobabilityofdoublebroodingbysouthernhousewrens
AT mermozme factorsaffectingtheprobabilityofdoublebroodingbysouthernhousewrens
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