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:	Liljesthrom, Marcela, Reboreda, Juan Carlos
Publicado:	2012
Materias:	Clutch size Egg size Laying order Reproductive investment Tachycineta meyeni Aves
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v114_n2_p377_Liljesthrom 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	paper:paper_00105422_v114_n2_p377_Liljesthrom
record_format	dspace
spelling	paper:paper_00105422_v114_n2_p377_Liljesthrom2023-06-08T14:34:36Z Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying Liljesthrom, Marcela Reboreda, Juan Carlos 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v114_n2_p377_Liljesthrom 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 Liljesthrom, Marcela Reboreda, Juan Carlos 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.
author	Liljesthrom, Marcela Reboreda, Juan Carlos
author_facet	Liljesthrom, Marcela Reboreda, Juan Carlos
author_sort	Liljesthrom, Marcela
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
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v114_n2_p377_Liljesthrom http://hdl.handle.net/20.500.12110/paper_00105422_v114_n2_p377_Liljesthrom
work_keys_str_mv	AT liljesthrommarcela clutchinvestmentinthechileanswallowtachycinetameyenishiftswithtimeofbreedingandpositioninthesequenceoflaying AT reboredajuancarlos clutchinvestmentinthechileanswallowtachycinetameyenishiftswithtimeofbreedingandpositioninthesequenceoflaying
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Clutch investment in the Chilean swallow (Tachycineta meyeni) shifts with time of breeding and position in the sequence of Laying

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