Population dynamics and avian brood parasitism: Persistence and invasions in a three-species system

1. Avian brood parasites include species that are host specialists and others that are generalists. The impact of each kind of parasite on the persistence of the host population is studied by means of a population dynamics model. 2. Our model examines conditions for coexistence and invasions in a co...

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Autores principales: Ney-Nifle, M., Bernstein, C., Reboreda, J.C., Kacelnik, A.
Formato: JOUR
Materias:
Brood parasitism
Cowbirds
Host specialism
Molothrus sp.
Population dynamics
brood parasitism
coexistence
host specificity
population dynamics
South America
Western Hemisphere
World
Aves
Galliformes
Molothrus
Molothrus badius
Molothrus bonariensis
Molothrus rufoaxillaris
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00218790_v74_n2_p274_NeyNifle
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00218790_v74_n2_p274_NeyNifle
record_format dspace
spelling todo:paper_00218790_v74_n2_p274_NeyNifle2023-10-03T14:21:46Z Population dynamics and avian brood parasitism: Persistence and invasions in a three-species system Ney-Nifle, M. Bernstein, C. Reboreda, J.C. Kacelnik, A. Brood parasitism Cowbirds Host specialism Molothrus sp. Population dynamics brood parasitism coexistence host specificity population dynamics South America Western Hemisphere World Aves Galliformes Molothrus Molothrus badius Molothrus bonariensis Molothrus rufoaxillaris 1. Avian brood parasites include species that are host specialists and others that are generalists. The impact of each kind of parasite on the persistence of the host population is studied by means of a population dynamics model. 2. Our model examines conditions for coexistence and invasions in a community of three South American cowbirds, the shiny cowbird Molothrus bonariensis (a generalist parasite), the screaming cowbird M. rufoaxillaris (a specialist parasite), and the baywinged cowbird Agelaiodes badius (a nonparasite that hosts the other two). 3. Three biologically realistic characteristics not previously included in brood parasitism models are explored and shown to be crucial for the stability of the system. These characteristics are: (i) female parasites take at least a day to produce an egg and cannot store eggs for delayed laying - this is modelled by means of a type II functional response; (ii) parasites often remove or puncture (destroy) host eggs when visiting a nest; and (iii) hosts desert nests when the total clutch (host plus parasite) exceeds some threshold. 4. These characteristics have a direct impact on parasite population renewal and reduce dramatically the stable coexistence conditions. 5. Comparing the stability conditions of the host-specialist system with those of the three-species system shows the impact of the arrival of a generalist parasite on the persistence of the host-specialist system when the three characteristics are present. The stability boundaries are restricted when the generalist is absent and change little for a realistic density of generalist. 6. The study of invasion by a specialist into a host-generalist stable community shows that the parameter region for coexistence and invasion coincide. 7. Comparison of our model against its precursors using field data for the parameters when available, shows that the three-species cowbird model system is stable for empirically realized parameter values, unlike a previous model by May & Robinson (1985; American Naturalist, 126, 475-494) where none of the three characteristics were included. © 2005 British Ecological Society. 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_00218790_v74_n2_p274_NeyNifle
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Brood parasitism
Cowbirds
Host specialism
Molothrus sp.
Population dynamics
brood parasitism
coexistence
host specificity
population dynamics
South America
Western Hemisphere
World
Aves
Galliformes
Molothrus
Molothrus badius
Molothrus bonariensis
Molothrus rufoaxillaris
spellingShingle Brood parasitism
Cowbirds
Host specialism
Molothrus sp.
Population dynamics
brood parasitism
coexistence
host specificity
population dynamics
South America
Western Hemisphere
World
Aves
Galliformes
Molothrus
Molothrus badius
Molothrus bonariensis
Molothrus rufoaxillaris
Ney-Nifle, M.
Bernstein, C.
Reboreda, J.C.
Kacelnik, A.
Population dynamics and avian brood parasitism: Persistence and invasions in a three-species system
topic_facet Brood parasitism
Cowbirds
Host specialism
Molothrus sp.
Population dynamics
brood parasitism
coexistence
host specificity
population dynamics
South America
Western Hemisphere
World
Aves
Galliformes
Molothrus
Molothrus badius
Molothrus bonariensis
Molothrus rufoaxillaris
description 1. Avian brood parasites include species that are host specialists and others that are generalists. The impact of each kind of parasite on the persistence of the host population is studied by means of a population dynamics model. 2. Our model examines conditions for coexistence and invasions in a community of three South American cowbirds, the shiny cowbird Molothrus bonariensis (a generalist parasite), the screaming cowbird M. rufoaxillaris (a specialist parasite), and the baywinged cowbird Agelaiodes badius (a nonparasite that hosts the other two). 3. Three biologically realistic characteristics not previously included in brood parasitism models are explored and shown to be crucial for the stability of the system. These characteristics are: (i) female parasites take at least a day to produce an egg and cannot store eggs for delayed laying - this is modelled by means of a type II functional response; (ii) parasites often remove or puncture (destroy) host eggs when visiting a nest; and (iii) hosts desert nests when the total clutch (host plus parasite) exceeds some threshold. 4. These characteristics have a direct impact on parasite population renewal and reduce dramatically the stable coexistence conditions. 5. Comparing the stability conditions of the host-specialist system with those of the three-species system shows the impact of the arrival of a generalist parasite on the persistence of the host-specialist system when the three characteristics are present. The stability boundaries are restricted when the generalist is absent and change little for a realistic density of generalist. 6. The study of invasion by a specialist into a host-generalist stable community shows that the parameter region for coexistence and invasion coincide. 7. Comparison of our model against its precursors using field data for the parameters when available, shows that the three-species cowbird model system is stable for empirically realized parameter values, unlike a previous model by May & Robinson (1985; American Naturalist, 126, 475-494) where none of the three characteristics were included. © 2005 British Ecological Society.
format JOUR
author Ney-Nifle, M.
Bernstein, C.
Reboreda, J.C.
Kacelnik, A.
author_facet Ney-Nifle, M.
Bernstein, C.
Reboreda, J.C.
Kacelnik, A.
author_sort Ney-Nifle, M.
title Population dynamics and avian brood parasitism: Persistence and invasions in a three-species system
title_short Population dynamics and avian brood parasitism: Persistence and invasions in a three-species system
title_full Population dynamics and avian brood parasitism: Persistence and invasions in a three-species system
title_fullStr Population dynamics and avian brood parasitism: Persistence and invasions in a three-species system
title_full_unstemmed Population dynamics and avian brood parasitism: Persistence and invasions in a three-species system
title_sort population dynamics and avian brood parasitism: persistence and invasions in a three-species system
url http://hdl.handle.net/20.500.12110/paper_00218790_v74_n2_p274_NeyNifle
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AT reboredajc populationdynamicsandavianbroodparasitismpersistenceandinvasionsinathreespeciessystem
AT kacelnika populationdynamicsandavianbroodparasitismpersistenceandinvasionsinathreespeciessystem
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