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Impacts of brood parasitism by shiny cowbird Molothrus bonariensis on the breeding success of a small host, the black-backed water tyrant Fluvicola albiventer.
Vanesa Sovrano, Lorena; Jesica León, Evelina; Ezequiel Lorenzón, Rodrigo; Fernanda Olguín, Pamela; Héctor Beltzer, Adolfo; Raúl Giraudo, Alejandro.
Afiliação
  • Vanesa Sovrano L; Laboratorio de Biodiversidad y Conservación de Tetrápodos, Instituto Nacional de Limnología (INALI; CONICET-UNL), Paraje El Pozo s/n, Santa Fe (3000), Argentina.
  • Jesica León E; Departamento de Biología, Universidad Autónoma de Entre Ríos, Km 10.5 RP 11, Oro Verde (3100), Entre Ríos, Argentina.
  • Ezequiel Lorenzón R; Laboratorio de Biodiversidad y Conservación de Tetrápodos, Instituto Nacional de Limnología (INALI; CONICET-UNL), Paraje El Pozo s/n, Santa Fe (3000), Argentina.
  • Fernanda Olguín P; Departamento de Biología, Universidad Autónoma de Entre Ríos, Km 10.5 RP 11, Oro Verde (3100), Entre Ríos, Argentina.
  • Héctor Beltzer A; Laboratorio de Biodiversidad y Conservación de Tetrápodos, Instituto Nacional de Limnología (INALI; CONICET-UNL), Paraje El Pozo s/n, Santa Fe (3000), Argentina.
  • Raúl Giraudo A; Laboratorio de Biodiversidad y Conservación de Tetrápodos, Instituto Nacional de Limnología (INALI; CONICET-UNL), Paraje El Pozo s/n, Santa Fe (3000), Argentina.
Curr Zool ; 70(4): 539-547, 2024 Aug.
Article em En | MEDLINE | ID: mdl-39176069
ABSTRACT
The shiny cowbird Molothrus bonariensis parasitizes many species with different life-history traits and has a detrimental effect on the survival of the progeny of the hosts. In response, hosts have developed numerous antiparasitic defenses. Here, we examined the effects of brood parasitism by shiny cowbird on the clutch and brood sizes (83 nests) in a small host, the black-backed water tyrant Fluvicola albiventer. We also studied whether the death of parasite nestlings was related to the care of the foster parents and whether the host had any antiparasitic defense against the shiny cowbird. Our results indicate that brood parasitism significantly decreased the host hatching and fledging successes. The majority of nest failures (57%) were caused by brood parasitism. Shiny cowbird parasitism occurred in 52% of nests and the intensity of parasitism was 1.23 ± 0.53 eggs per parasitized nest. Of the total host eggs, 54% were damaged. During the incubation stage, 20 nests (47%) were abandoned because of egg punctures by shiny cowbirds females. Only two parasitic fledglings were recorded, while the remaining nestlings either died from starvation (n = 12) or predation (n = 3). Foster parents abandoned parasitic nestlings between 5 and 10 days old. Our findings demonstrate that the shiny cowbird has very low rates of fledging success when parasitizing black-backed water tyrant. Also, parasitism had a high reproductive cost in the black-backed water tyrant because a very low proportion (7%) of the parasitized nests (n = 43) were successful.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Curr Zool Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Argentina País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Curr Zool Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Argentina País de publicação: Reino Unido