Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying

Within a population, the sizes of eggs and clutches vary, and the combination of both determines a female's reproductive investment. We investigated females' investment in clutches of the Chilean Swallow (Tachycineta meyeni) at the southern limit of its range, where it breeds in an extreme...

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Autores principales: Liljesthröm, M., Cooper, C., Reboreda, J.C.
Formato: JOUR
Materias:
Clutch size
Egg size
Laying order
Reproductive investment
Tachycineta meyeni
Aves
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00105422_v114_n2_p377_Liljesthrom
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00105422_v114_n2_p377_Liljesthrom
record_format dspace
spelling todo:paper_00105422_v114_n2_p377_Liljesthrom2023-10-03T14:09:23Z Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying Liljesthröm, M. Cooper, C. Reboreda, J.C. Clutch size Egg size Laying order Reproductive investment Tachycineta meyeni Aves Tachycineta meyeni Within a population, the sizes of eggs and clutches vary, and the combination of both determines a female's reproductive investment. We investigated females' investment in clutches of the Chilean Swallow (Tachycineta meyeni) at the southern limit of its range, where it breeds in an extreme climate. We analyzed variation in clutch, egg and yolk size in relation to the female's condition, date of laying, and position in the sequence of laying. As predicted by energy/nutrient constraints, clutch size and yolk size decreased over the breeding season, though egg mass increased. Females' investment strategy differed with clutch size: their investment in eggs increased with each successive egg in clutches of 4 and 5 eggs but decreased with each successive egg in clutches of 3 eggs. Eggs that were heavier for their size were more likely to hatch than eggs light for their size. Females may make a strategic decision, with high investment in eggs laid early resulting in a short sequence (small clutch) and delayed investment resulting in a long sequence (large clutch). Alternatively, the shift in clutch investment may simply be a consequence of physiology. Better estimates of female body condition are needed for these options to be distinguished. © The Cooper Ornithological Society 2012. Fil:Liljesthröm, M. 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_00105422_v114_n2_p377_Liljesthrom
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Clutch size
Egg size
Laying order
Reproductive investment
Tachycineta meyeni
Aves
Tachycineta meyeni
spellingShingle Clutch size
Egg size
Laying order
Reproductive investment
Tachycineta meyeni
Aves
Tachycineta meyeni
Liljesthröm, M.
Cooper, C.
Reboreda, J.C.
Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying
topic_facet Clutch size
Egg size
Laying order
Reproductive investment
Tachycineta meyeni
Aves
Tachycineta meyeni
description Within a population, the sizes of eggs and clutches vary, and the combination of both determines a female's reproductive investment. We investigated females' investment in clutches of the Chilean Swallow (Tachycineta meyeni) at the southern limit of its range, where it breeds in an extreme climate. We analyzed variation in clutch, egg and yolk size in relation to the female's condition, date of laying, and position in the sequence of laying. As predicted by energy/nutrient constraints, clutch size and yolk size decreased over the breeding season, though egg mass increased. Females' investment strategy differed with clutch size: their investment in eggs increased with each successive egg in clutches of 4 and 5 eggs but decreased with each successive egg in clutches of 3 eggs. Eggs that were heavier for their size were more likely to hatch than eggs light for their size. Females may make a strategic decision, with high investment in eggs laid early resulting in a short sequence (small clutch) and delayed investment resulting in a long sequence (large clutch). Alternatively, the shift in clutch investment may simply be a consequence of physiology. Better estimates of female body condition are needed for these options to be distinguished. © The Cooper Ornithological Society 2012.
format JOUR
author Liljesthröm, M.
Cooper, C.
Reboreda, J.C.
author_facet Liljesthröm, M.
Cooper, C.
Reboreda, J.C.
author_sort Liljesthröm, M.
title Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying
title_short Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying
title_full Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying
title_fullStr Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying
title_full_unstemmed Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying
title_sort clutch investment in the chilean swallow (tachycineta meyeni) shifts with time of breeding and position in the sequence of laying
url http://hdl.handle.net/20.500.12110/paper_00105422_v114_n2_p377_Liljesthrom
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AT cooperc clutchinvestmentinthechileanswallowtachycinetameyenishiftswithtimeofbreedingandpositioninthesequenceoflaying
AT reboredajc clutchinvestmentinthechileanswallowtachycinetameyenishiftswithtimeofbreedingandpositioninthesequenceoflaying
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