Trios of Brown Skuas at Bird Island, South Georgia: Incidence and Composition
Abstract Cooperative breeding is unusual in seabirds, but recorded in varying proportions in Brown Skuas (Stercorarius [= Catharacta] lonnbergi). With no evidence for kin selection or delayed dispersal, nor for any reproductive advantage, the reason for its occurrence in skuas is uncertain. This stu...
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Oxford University Press (OUP)
2002
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Online Access: | http://dx.doi.org/10.1093/condor/104.3.694 http://academic.oup.com/condor/article-pdf/104/3/694/29712940/condor0694.pdf |
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croxfordunivpr:10.1093/condor/104.3.694 2023-05-15T15:44:39+02:00 Trios of Brown Skuas at Bird Island, South Georgia: Incidence and Composition Phillips, Richard A. 2002 http://dx.doi.org/10.1093/condor/104.3.694 http://academic.oup.com/condor/article-pdf/104/3/694/29712940/condor0694.pdf en eng Oxford University Press (OUP) The Condor volume 104, issue 3, page 694-697 ISSN 0010-5422 1938-5129 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2002 croxfordunivpr https://doi.org/10.1093/condor/104.3.694 2022-04-15T06:16:30Z Abstract Cooperative breeding is unusual in seabirds, but recorded in varying proportions in Brown Skuas (Stercorarius [= Catharacta] lonnbergi). With no evidence for kin selection or delayed dispersal, nor for any reproductive advantage, the reason for its occurrence in skuas is uncertain. This study describes the incidence, composition, and breeding characteristics of trios of Brown Skuas at Bird Island, South Georgia. Trios were recorded in nine seasons, including a polygynous and a polyandrous trio found in both 2000–2001 and 2001–2002. In some years, birds hatched three chicks from supranormal clutches, which is exceptional in skuas and jaegers, yet their overall performance was no better than monogamous pairs. I suggest that compared with closely related taxa, Brown Skuas have a slight behavioral or genetic predisposition that facilitates cooperative breeding. Cooperation conveys a minor advantage in territory acquisition, but none in terms of reproductive success (particularly for polygynous groups), and consequently has not proliferated at most colonies. Tríos de Stercorarius [= Catharacta] lonnbergi en Bird Island, Georgia del Sur: Incidencia y Composición Resumen. La crianza cooperativa es inusual en aves marinas pero se ha reportado en diversa medida en Stercorarius [= Catharacta] lonnbergi. Sin ninguna evidencia sobre selección de parentesco o dispersión retrasada, ni ninguna ventaja reproductiva, se desconoce por qué sucede en los págalos. Este estudio describe la incidencia, composición y características de cría de tríos de S. lonnbergi en Bird Island, Georgia del Sur. Varios tríos fueron monitoreados durante nueve estaciones, incluyendo un trío poligínico y otro poliándrico encontrados en 2000–2001 y 2001–2002, respectivamente. En algunos años las aves lograron la eclosión de tres polluelos de nidadas más grandes de lo normal, lo cual es excepcional en págalos, pero su éxito no fue mayor que el de parejas monógamas. Se sugiere que en comparación con taxa estrechamente relacionados, S. lonnbergi tiene una ligera predisposición de tipo comportamental o genética que facilita la cría cooperativa. La cooperación conlleva una cierta ventaja en la adquisición de territorios, pero ninguna ventaja en términos de éxito reproductivo (en particular para grupos poligínicos), y en consecuencia no ha proliferado en la mayoría de las colonias. Article in Journal/Newspaper Bird Island Oxford University Press (via Crossref) Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Consecuencia ENVELOPE(-60.783,-60.783,-63.717,-63.717) Trío ENVELOPE(-62.898,-62.898,-64.294,-64.294) The Condor 104 3 694 697 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Phillips, Richard A. Trios of Brown Skuas at Bird Island, South Georgia: Incidence and Composition |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract Cooperative breeding is unusual in seabirds, but recorded in varying proportions in Brown Skuas (Stercorarius [= Catharacta] lonnbergi). With no evidence for kin selection or delayed dispersal, nor for any reproductive advantage, the reason for its occurrence in skuas is uncertain. This study describes the incidence, composition, and breeding characteristics of trios of Brown Skuas at Bird Island, South Georgia. Trios were recorded in nine seasons, including a polygynous and a polyandrous trio found in both 2000–2001 and 2001–2002. In some years, birds hatched three chicks from supranormal clutches, which is exceptional in skuas and jaegers, yet their overall performance was no better than monogamous pairs. I suggest that compared with closely related taxa, Brown Skuas have a slight behavioral or genetic predisposition that facilitates cooperative breeding. Cooperation conveys a minor advantage in territory acquisition, but none in terms of reproductive success (particularly for polygynous groups), and consequently has not proliferated at most colonies. Tríos de Stercorarius [= Catharacta] lonnbergi en Bird Island, Georgia del Sur: Incidencia y Composición Resumen. La crianza cooperativa es inusual en aves marinas pero se ha reportado en diversa medida en Stercorarius [= Catharacta] lonnbergi. Sin ninguna evidencia sobre selección de parentesco o dispersión retrasada, ni ninguna ventaja reproductiva, se desconoce por qué sucede en los págalos. Este estudio describe la incidencia, composición y características de cría de tríos de S. lonnbergi en Bird Island, Georgia del Sur. Varios tríos fueron monitoreados durante nueve estaciones, incluyendo un trío poligínico y otro poliándrico encontrados en 2000–2001 y 2001–2002, respectivamente. En algunos años las aves lograron la eclosión de tres polluelos de nidadas más grandes de lo normal, lo cual es excepcional en págalos, pero su éxito no fue mayor que el de parejas monógamas. Se sugiere que en comparación con taxa estrechamente relacionados, S. lonnbergi tiene una ligera predisposición de tipo comportamental o genética que facilita la cría cooperativa. La cooperación conlleva una cierta ventaja en la adquisición de territorios, pero ninguna ventaja en términos de éxito reproductivo (en particular para grupos poligínicos), y en consecuencia no ha proliferado en la mayoría de las colonias. |
format |
Article in Journal/Newspaper |
author |
Phillips, Richard A. |
author_facet |
Phillips, Richard A. |
author_sort |
Phillips, Richard A. |
title |
Trios of Brown Skuas at Bird Island, South Georgia: Incidence and Composition |
title_short |
Trios of Brown Skuas at Bird Island, South Georgia: Incidence and Composition |
title_full |
Trios of Brown Skuas at Bird Island, South Georgia: Incidence and Composition |
title_fullStr |
Trios of Brown Skuas at Bird Island, South Georgia: Incidence and Composition |
title_full_unstemmed |
Trios of Brown Skuas at Bird Island, South Georgia: Incidence and Composition |
title_sort |
trios of brown skuas at bird island, south georgia: incidence and composition |
publisher |
Oxford University Press (OUP) |
publishDate |
2002 |
url |
http://dx.doi.org/10.1093/condor/104.3.694 http://academic.oup.com/condor/article-pdf/104/3/694/29712940/condor0694.pdf |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(-60.783,-60.783,-63.717,-63.717) ENVELOPE(-62.898,-62.898,-64.294,-64.294) |
geographic |
Bird Island Consecuencia Trío |
geographic_facet |
Bird Island Consecuencia Trío |
genre |
Bird Island |
genre_facet |
Bird Island |
op_source |
The Condor volume 104, issue 3, page 694-697 ISSN 0010-5422 1938-5129 |
op_doi |
https://doi.org/10.1093/condor/104.3.694 |
container_title |
The Condor |
container_volume |
104 |
container_issue |
3 |
container_start_page |
694 |
op_container_end_page |
697 |
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1766379032307302400 |