Understanding the low breeding success in Greater Rheas populations through an energy budget model

We propose an individual-based energy budget model of the Greater Rhea (Rhea americana) with the purpose of analyzing the population's recruitment. One remarkable characteristic of this species is that female rheas lay eggs communally and males incubate the eggs and care for the chicks without...

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Autores principales:	Simoy, M.V., Canziani, G.A., Fernández, G.J., Marinelli, C.B.
Formato:	JOUR
Materias:	Body weight dynamics Daily energetic cost Energy balance Quantitative modeling Rhea americana Aves Rhea Rheiformes
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_1476945X_v18_n_p10_Simoy
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_1476945X_v18_n_p10_Simoy
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spelling	todo:paper_1476945X_v18_n_p10_Simoy2023-10-03T16:19:00Z Understanding the low breeding success in Greater Rheas populations through an energy budget model Simoy, M.V. Canziani, G.A. Fernández, G.J. Marinelli, C.B. Body weight dynamics Daily energetic cost Energy balance Quantitative modeling Rhea americana Aves Rhea Rhea americana Rheiformes We propose an individual-based energy budget model of the Greater Rhea (Rhea americana) with the purpose of analyzing the population's recruitment. One remarkable characteristic of this species is that female rheas lay eggs communally and males incubate the eggs and care for the chicks without the assistance of females. The model is based on a system of equations daily updating the weight of each bird as a function of its ingestion rate and the energetic cost of its activity pattern. Ingestion rate is calculated from field experiments. Daily energetic costs are estimated from activity patterns observed in the field, taking into account gender and factors that influence behavior (e.g., photoperiod, season). Concatenating daily model outputs, the weight dynamics of an individual can be calculated over any given period of time. The possible factors that affect the successful breeding of the Greater Rhea and therefore population growth are analyzed using the model. Different reproductive strategies for each gender are analyzed and the minimal body weight, and thus energy reserves, that an individual needs to achieve for ensuring reproductive success is determined. Model outputs show that the reproductive success of males depends strongly on their body weight while females exhibit low nutritional requirements for producing eggs. An analysis of model outputs allows inferring that males in wild populations might not be able to breed in consecutive years but could successfully breed every other year. They also allow estimating the incidence that food availability has on population growth. Management strategies that are easy to implement in extensive and semi-extensive farms may allow obtaining male individuals capable of breeding every year. © 2014 Elsevier B.V. Fil:Simoy, M.V. 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_1476945X_v18_n_p10_Simoy
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Body weight dynamics Daily energetic cost Energy balance Quantitative modeling Rhea americana Aves Rhea Rhea americana Rheiformes
spellingShingle	Body weight dynamics Daily energetic cost Energy balance Quantitative modeling Rhea americana Aves Rhea Rhea americana Rheiformes Simoy, M.V. Canziani, G.A. Fernández, G.J. Marinelli, C.B. Understanding the low breeding success in Greater Rheas populations through an energy budget model
topic_facet	Body weight dynamics Daily energetic cost Energy balance Quantitative modeling Rhea americana Aves Rhea Rhea americana Rheiformes
description	We propose an individual-based energy budget model of the Greater Rhea (Rhea americana) with the purpose of analyzing the population's recruitment. One remarkable characteristic of this species is that female rheas lay eggs communally and males incubate the eggs and care for the chicks without the assistance of females. The model is based on a system of equations daily updating the weight of each bird as a function of its ingestion rate and the energetic cost of its activity pattern. Ingestion rate is calculated from field experiments. Daily energetic costs are estimated from activity patterns observed in the field, taking into account gender and factors that influence behavior (e.g., photoperiod, season). Concatenating daily model outputs, the weight dynamics of an individual can be calculated over any given period of time. The possible factors that affect the successful breeding of the Greater Rhea and therefore population growth are analyzed using the model. Different reproductive strategies for each gender are analyzed and the minimal body weight, and thus energy reserves, that an individual needs to achieve for ensuring reproductive success is determined. Model outputs show that the reproductive success of males depends strongly on their body weight while females exhibit low nutritional requirements for producing eggs. An analysis of model outputs allows inferring that males in wild populations might not be able to breed in consecutive years but could successfully breed every other year. They also allow estimating the incidence that food availability has on population growth. Management strategies that are easy to implement in extensive and semi-extensive farms may allow obtaining male individuals capable of breeding every year. © 2014 Elsevier B.V.
format	JOUR
author	Simoy, M.V. Canziani, G.A. Fernández, G.J. Marinelli, C.B.
author_facet	Simoy, M.V. Canziani, G.A. Fernández, G.J. Marinelli, C.B.
author_sort	Simoy, M.V.
title	Understanding the low breeding success in Greater Rheas populations through an energy budget model
title_short	Understanding the low breeding success in Greater Rheas populations through an energy budget model
title_full	Understanding the low breeding success in Greater Rheas populations through an energy budget model
title_fullStr	Understanding the low breeding success in Greater Rheas populations through an energy budget model
title_full_unstemmed	Understanding the low breeding success in Greater Rheas populations through an energy budget model
title_sort	understanding the low breeding success in greater rheas populations through an energy budget model
url	http://hdl.handle.net/20.500.12110/paper_1476945X_v18_n_p10_Simoy
work_keys_str_mv	AT simoymv understandingthelowbreedingsuccessingreaterrheaspopulationsthroughanenergybudgetmodel AT canzianiga understandingthelowbreedingsuccessingreaterrheaspopulationsthroughanenergybudgetmodel AT fernandezgj understandingthelowbreedingsuccessingreaterrheaspopulationsthroughanenergybudgetmodel AT marinellicb understandingthelowbreedingsuccessingreaterrheaspopulationsthroughanenergybudgetmodel
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Understanding the low breeding success in Greater Rheas populations through an energy budget model

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