Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests

Brood-parasitic cowbirds are hypothesized to search for and locate host nests within a relatively constant area, as this is presumed to facilitate the monitoring of nests over time and the synchronization of parasitism with host laying. We tested this hypothesis in Shiny Cowbirds (Molothrus bonarien...

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Autores principales: Scardamaglia, R.C., Reboreda, J.C.
Formato: JOUR
Materias:
Brood parasitism
Molothrus bonariensis
Molothrus rufoaxillaris
Nest searching
Radio telemetry
Social monogamy
breeding season
brood parasitism
nesting behavior
passerine
range size
territoriality
Molothrus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00048038_v131_n4_p610_Scardamaglia
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00048038_v131_n4_p610_Scardamaglia
record_format dspace
spelling todo:paper_00048038_v131_n4_p610_Scardamaglia2023-10-03T14:03:06Z Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests Scardamaglia, R.C. Reboreda, J.C. Brood parasitism Molothrus bonariensis Molothrus rufoaxillaris Nest searching Radio telemetry Social monogamy breeding season brood parasitism nesting behavior passerine range size territoriality Molothrus Molothrus bonariensis Molothrus rufoaxillaris Brood-parasitic cowbirds are hypothesized to search for and locate host nests within a relatively constant area, as this is presumed to facilitate the monitoring of nests over time and the synchronization of parasitism with host laying. We tested this hypothesis in Shiny Cowbirds (Molothrus bonariensis) and Screaming Cowbirds (M. rufoaxillaris), two cowbird species that differ in host specificity and, apparently, in social mating system, by radio-tracking females and males for 3-6 consecutive days and determining individual daily morning ranges and cumulative morning ranges. In Shiny Cowbirds, the mean size of morning daily ranges and cumulative morning ranges was larger for males than for females, but we did not find a difference between the sexes in range size for Screaming Cowbirds. In both species, there was extensive overlap in the morning ranges of individual females between consecutive days, and the addition of new area to their ranges decreased over time. For both Shiny and Screaming cowbirds, morning ranges of conspecific females radio-tracked the same day overlapped, indicating lack of territoriality. Male and female Screaming Cowbirds that were trapped together were also spatially associated during radio-tracking, indicating social monogamy. Most radio-tracked Shiny and Screaming cowbirds used mainly one roost, relatively close to their morning ranges, which was maintained throughout the breeding season. Our results show that Shiny and Screaming cowbird females use relatively constant areas for nest searching and that Screaming Cowbirds are socially monogamous. Copyright © 2014 American Ornithologists' Union. Fil:Scardamaglia, R.C. 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_v131_n4_p610_Scardamaglia
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
Molothrus bonariensis
Molothrus rufoaxillaris
Nest searching
Radio telemetry
Social monogamy
breeding season
brood parasitism
nesting behavior
passerine
range size
territoriality
Molothrus
Molothrus bonariensis
Molothrus rufoaxillaris
spellingShingle Brood parasitism
Molothrus bonariensis
Molothrus rufoaxillaris
Nest searching
Radio telemetry
Social monogamy
breeding season
brood parasitism
nesting behavior
passerine
range size
territoriality
Molothrus
Molothrus bonariensis
Molothrus rufoaxillaris
Scardamaglia, R.C.
Reboreda, J.C.
Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests
topic_facet Brood parasitism
Molothrus bonariensis
Molothrus rufoaxillaris
Nest searching
Radio telemetry
Social monogamy
breeding season
brood parasitism
nesting behavior
passerine
range size
territoriality
Molothrus
Molothrus bonariensis
Molothrus rufoaxillaris
description Brood-parasitic cowbirds are hypothesized to search for and locate host nests within a relatively constant area, as this is presumed to facilitate the monitoring of nests over time and the synchronization of parasitism with host laying. We tested this hypothesis in Shiny Cowbirds (Molothrus bonariensis) and Screaming Cowbirds (M. rufoaxillaris), two cowbird species that differ in host specificity and, apparently, in social mating system, by radio-tracking females and males for 3-6 consecutive days and determining individual daily morning ranges and cumulative morning ranges. In Shiny Cowbirds, the mean size of morning daily ranges and cumulative morning ranges was larger for males than for females, but we did not find a difference between the sexes in range size for Screaming Cowbirds. In both species, there was extensive overlap in the morning ranges of individual females between consecutive days, and the addition of new area to their ranges decreased over time. For both Shiny and Screaming cowbirds, morning ranges of conspecific females radio-tracked the same day overlapped, indicating lack of territoriality. Male and female Screaming Cowbirds that were trapped together were also spatially associated during radio-tracking, indicating social monogamy. Most radio-tracked Shiny and Screaming cowbirds used mainly one roost, relatively close to their morning ranges, which was maintained throughout the breeding season. Our results show that Shiny and Screaming cowbird females use relatively constant areas for nest searching and that Screaming Cowbirds are socially monogamous. Copyright © 2014 American Ornithologists' Union.
format JOUR
author Scardamaglia, R.C.
Reboreda, J.C.
author_facet Scardamaglia, R.C.
Reboreda, J.C.
author_sort Scardamaglia, R.C.
title Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests
title_short Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests
title_full Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests
title_fullStr Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests
title_full_unstemmed Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests
title_sort ranging behavior of female and male shiny cowbirds and screaming cowbirds while searching for host nests
url http://hdl.handle.net/20.500.12110/paper_00048038_v131_n4_p610_Scardamaglia
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AT reboredajc rangingbehavioroffemaleandmaleshinycowbirdsandscreamingcowbirdswhilesearchingforhostnests
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