Between and within clutch variation of egg size in greater rheas

We describe egg characteristics, and analyze between and within clutch variation in egg size and mass in a natural population of Greater Rheas (Rhea americana). We assess the effect of this variation on nesting success and egg success. Yolk represented 29.5% of egg mass whereas albumen was 63.9%. Yo...

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Detalles Bibliográficos
Autores principales: Fernández, G.J., Reboreda, J.C.
Formato: JOUR
Materias:
bird
breeding season
clutch size
egg size
fitness
nesting success
parental investment
protein
Rhea
Rhea americana
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15594491_v120_n4_p674_Fernandez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15594491_v120_n4_p674_Fernandez
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spelling todo:paper_15594491_v120_n4_p674_Fernandez2023-10-03T16:26:15Z Between and within clutch variation of egg size in greater rheas Fernández, G.J. Reboreda, J.C. bird breeding season clutch size egg size fitness nesting success parental investment protein Rhea Rhea americana We describe egg characteristics, and analyze between and within clutch variation in egg size and mass in a natural population of Greater Rheas (Rhea americana). We assess the effect of this variation on nesting success and egg success. Yolk represented 29.5% of egg mass whereas albumen was 63.9%. Yolk mass increased with egg width but not with egg length, while mass of albumen increased mainly with egg length. The largest and smallest eggs were 10.3% larger and 25.3% smaller, respectively than mean intra-clutch values. The widest egg was 11.9% wider while the narrowest egg was 20.5% narrower than mean intra-clutch values. There was a significant decrease in egg size between clutches during the breeding season as a result of a decrease in egg length. There was no effect of laying order on intra-clutch variation in egg size, but we detected an increase in the variation of egg length within clutches with clutch size. We did not detect a relationship between egg size and nesting success, and between egg size and egg success. The relatively low intra-clutch variation in egg size and lack of effect of egg size on hatching success do not support the hypothesis that females invest in eggs according to expected chick fitness. Fil:Fernández, G.J. 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_15594491_v120_n4_p674_Fernandez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic bird
breeding season
clutch size
egg size
fitness
nesting success
parental investment
protein
Rhea
Rhea americana
spellingShingle bird
breeding season
clutch size
egg size
fitness
nesting success
parental investment
protein
Rhea
Rhea americana
Fernández, G.J.
Reboreda, J.C.
Between and within clutch variation of egg size in greater rheas
topic_facet bird
breeding season
clutch size
egg size
fitness
nesting success
parental investment
protein
Rhea
Rhea americana
description We describe egg characteristics, and analyze between and within clutch variation in egg size and mass in a natural population of Greater Rheas (Rhea americana). We assess the effect of this variation on nesting success and egg success. Yolk represented 29.5% of egg mass whereas albumen was 63.9%. Yolk mass increased with egg width but not with egg length, while mass of albumen increased mainly with egg length. The largest and smallest eggs were 10.3% larger and 25.3% smaller, respectively than mean intra-clutch values. The widest egg was 11.9% wider while the narrowest egg was 20.5% narrower than mean intra-clutch values. There was a significant decrease in egg size between clutches during the breeding season as a result of a decrease in egg length. There was no effect of laying order on intra-clutch variation in egg size, but we detected an increase in the variation of egg length within clutches with clutch size. We did not detect a relationship between egg size and nesting success, and between egg size and egg success. The relatively low intra-clutch variation in egg size and lack of effect of egg size on hatching success do not support the hypothesis that females invest in eggs according to expected chick fitness.
format JOUR
author Fernández, G.J.
Reboreda, J.C.
author_facet Fernández, G.J.
Reboreda, J.C.
author_sort Fernández, G.J.
title Between and within clutch variation of egg size in greater rheas
title_short Between and within clutch variation of egg size in greater rheas
title_full Between and within clutch variation of egg size in greater rheas
title_fullStr Between and within clutch variation of egg size in greater rheas
title_full_unstemmed Between and within clutch variation of egg size in greater rheas
title_sort between and within clutch variation of egg size in greater rheas
url http://hdl.handle.net/20.500.12110/paper_15594491_v120_n4_p674_Fernandez
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