Effects of clutch size and timing of breeding on reproductive success of Greater Rheas
Greater Rheas (Rhea americana) have an unusual breeding system that combines harem-defense polygyny, communal egg laying, and exclusive male parental care. We studied survivorship of eggs and nests in relation to clutch size and timing of breeding and estimated the reproductive success of males and...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00048038_v115_n2_p340_Fernandez |
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todo:paper_00048038_v115_n2_p340_Fernandez2023-10-03T14:03:03Z Effects of clutch size and timing of breeding on reproductive success of Greater Rheas Fernández, G.J. Reboreda, J.C. breeding season clutch size greater rhea reproductive success Rhea americana Rhea americana Greater Rheas (Rhea americana) have an unusual breeding system that combines harem-defense polygyny, communal egg laying, and exclusive male parental care. We studied survivorship of eggs and nests in relation to clutch size and timing of breeding and estimated the reproductive success of males and females. The number of eggs in a nest varied from 8 to 56, although in most cases it was between 20 and 30. Nests with more than 30 to 35 eggs had longer laying periods, lost more eggs during incubation, and had lower hatchability. As a result, the number of chicks hatched per nest increased with clutch size up to 30 to 35 eggs but decreased for larger clutches. More than 65% of the nests were deserted during incubation, and only 5 to 6% of the male population bred successfully each year. Nesting success was inversely correlated with rainfall during the breeding season and positively correlated with time of the breeding season. Chick survival during the first months after hatching averaged 60%. We suggest that the proportion of males that are able to attempt breeding is limited by energetic constraints. 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_00048038_v115_n2_p340_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 |
breeding season clutch size greater rhea reproductive success Rhea americana Rhea americana |
| spellingShingle |
breeding season clutch size greater rhea reproductive success Rhea americana Rhea americana Fernández, G.J. Reboreda, J.C. Effects of clutch size and timing of breeding on reproductive success of Greater Rheas |
| topic_facet |
breeding season clutch size greater rhea reproductive success Rhea americana Rhea americana |
| description |
Greater Rheas (Rhea americana) have an unusual breeding system that combines harem-defense polygyny, communal egg laying, and exclusive male parental care. We studied survivorship of eggs and nests in relation to clutch size and timing of breeding and estimated the reproductive success of males and females. The number of eggs in a nest varied from 8 to 56, although in most cases it was between 20 and 30. Nests with more than 30 to 35 eggs had longer laying periods, lost more eggs during incubation, and had lower hatchability. As a result, the number of chicks hatched per nest increased with clutch size up to 30 to 35 eggs but decreased for larger clutches. More than 65% of the nests were deserted during incubation, and only 5 to 6% of the male population bred successfully each year. Nesting success was inversely correlated with rainfall during the breeding season and positively correlated with time of the breeding season. Chick survival during the first months after hatching averaged 60%. We suggest that the proportion of males that are able to attempt breeding is limited by energetic constraints. |
| format |
JOUR |
| author |
Fernández, G.J. Reboreda, J.C. |
| author_facet |
Fernández, G.J. Reboreda, J.C. |
| author_sort |
Fernández, G.J. |
| title |
Effects of clutch size and timing of breeding on reproductive success of Greater Rheas |
| title_short |
Effects of clutch size and timing of breeding on reproductive success of Greater Rheas |
| title_full |
Effects of clutch size and timing of breeding on reproductive success of Greater Rheas |
| title_fullStr |
Effects of clutch size and timing of breeding on reproductive success of Greater Rheas |
| title_full_unstemmed |
Effects of clutch size and timing of breeding on reproductive success of Greater Rheas |
| title_sort |
effects of clutch size and timing of breeding on reproductive success of greater rheas |
| url |
http://hdl.handle.net/20.500.12110/paper_00048038_v115_n2_p340_Fernandez |
| work_keys_str_mv |
AT fernandezgj effectsofclutchsizeandtimingofbreedingonreproductivesuccessofgreaterrheas AT reboredajc effectsofclutchsizeandtimingofbreedingonreproductivesuccessofgreaterrheas |
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