Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs?

Obligate brood parasites should synchronize parasitism with host laying to maximize egg hatchability and chick survival. While the generalist Shiny (Molothrus bonariensis), Brown-headed (M. ater), and Bronzed (M. aeneus) Cowbirds frequently synchronize parasitism with host laying, specialist Screami...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autor principal:	Reboreda, Juan Carlos
Publicado:	2008
Materias:	Agelaioides badius Bay-winged Cowbird Brood parasitism Egg laying Molothrus rufoaxillaris Screaming cowbird Molothrus Molothrus bonariensis
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v110_n1_p143_DeMariso http://hdl.handle.net/20.500.12110/paper_00105422_v110_n1_p143_DeMariso
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00105422_v110_n1_p143_DeMariso
record_format	dspace
spelling	paper:paper_00105422_v110_n1_p143_DeMariso2023-06-08T14:34:33Z Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs? Reboreda, Juan Carlos Agelaioides badius Bay-winged Cowbird Brood parasitism Egg laying Molothrus rufoaxillaris Screaming cowbird Molothrus Molothrus bonariensis Molothrus rufoaxillaris Obligate brood parasites should synchronize parasitism with host laying to maximize egg hatchability and chick survival. While the generalist Shiny (Molothrus bonariensis), Brown-headed (M. ater), and Bronzed (M. aeneus) Cowbirds frequently synchronize parasitism with host laying, specialist Screaming Cowbirds (M. rufoaxillaris) very often fail to do so in nests of their main host, the Bay-winged Cowbird (Agelaioides badius). The poor synchronization of Screaming Cowbird parasitism may be the result of low availability of host nests at the time of laying, higher nest attentiveness by the host during laying, or unpredictable host laying behavior. We used a large set of observational data to test these hypotheses. The rate of Screaming Cowbird parasitism occurring during host prelaying was 31%, while during laying and incubation, it was 50% and 19%, respectively. Synchronization of parasitism was not associated with availability of host nests at laying or with changes in host nest attentiveness through the nesting cycle. The length of the prelaying period varied from one to 19 days and was not associated with latency of parasitism after nest completion. Nests with prelaying periods of 4-6 days received fewer eggs than nests with shorter or longer periods. Shiny Cowbirds also parasitized Bay-winged Cowbirds during prelaying more frequently (48%) than in other studied hosts (1%-8%). Our results indicate that Bay-winged Cowbird prelaying behavior precludes synchronization between parasitism and host laying and therefore may act as an antiparasitic defense, as it decreases the incidence of successful parasitism. © The Cooper Ornithological Society 2008. Fil:Reboreda, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v110_n1_p143_DeMariso http://hdl.handle.net/20.500.12110/paper_00105422_v110_n1_p143_DeMariso
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Agelaioides badius Bay-winged Cowbird Brood parasitism Egg laying Molothrus rufoaxillaris Screaming cowbird Molothrus Molothrus bonariensis Molothrus rufoaxillaris
spellingShingle	Agelaioides badius Bay-winged Cowbird Brood parasitism Egg laying Molothrus rufoaxillaris Screaming cowbird Molothrus Molothrus bonariensis Molothrus rufoaxillaris Reboreda, Juan Carlos Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs?
topic_facet	Agelaioides badius Bay-winged Cowbird Brood parasitism Egg laying Molothrus rufoaxillaris Screaming cowbird Molothrus Molothrus bonariensis Molothrus rufoaxillaris
description	Obligate brood parasites should synchronize parasitism with host laying to maximize egg hatchability and chick survival. While the generalist Shiny (Molothrus bonariensis), Brown-headed (M. ater), and Bronzed (M. aeneus) Cowbirds frequently synchronize parasitism with host laying, specialist Screaming Cowbirds (M. rufoaxillaris) very often fail to do so in nests of their main host, the Bay-winged Cowbird (Agelaioides badius). The poor synchronization of Screaming Cowbird parasitism may be the result of low availability of host nests at the time of laying, higher nest attentiveness by the host during laying, or unpredictable host laying behavior. We used a large set of observational data to test these hypotheses. The rate of Screaming Cowbird parasitism occurring during host prelaying was 31%, while during laying and incubation, it was 50% and 19%, respectively. Synchronization of parasitism was not associated with availability of host nests at laying or with changes in host nest attentiveness through the nesting cycle. The length of the prelaying period varied from one to 19 days and was not associated with latency of parasitism after nest completion. Nests with prelaying periods of 4-6 days received fewer eggs than nests with shorter or longer periods. Shiny Cowbirds also parasitized Bay-winged Cowbirds during prelaying more frequently (48%) than in other studied hosts (1%-8%). Our results indicate that Bay-winged Cowbird prelaying behavior precludes synchronization between parasitism and host laying and therefore may act as an antiparasitic defense, as it decreases the incidence of successful parasitism. © The Cooper Ornithological Society 2008.
author	Reboreda, Juan Carlos
author_facet	Reboreda, Juan Carlos
author_sort	Reboreda, Juan Carlos
title	Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs?
title_short	Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs?
title_full	Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs?
title_fullStr	Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs?
title_full_unstemmed	Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs?
title_sort	egg-laying behavior in screaming cowbirds: why does a specialist brood parasite waste so many eggs?
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v110_n1_p143_DeMariso http://hdl.handle.net/20.500.12110/paper_00105422_v110_n1_p143_DeMariso
work_keys_str_mv	AT reboredajuancarlos egglayingbehaviorinscreamingcowbirdswhydoesaspecialistbroodparasitewastesomanyeggs
_version_	1768545077952512000

Egg-laying behavior in screaming cowbirds: Why does a specialist brood parasite waste so many eggs?

Ejemplares similares