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dc.contributor.author
Gownaris, Natasha J.
dc.contributor.author
Garcia Borboroglu, Jorge Pablo
dc.contributor.author
Boersma, P. Dee
dc.date.available
2021-09-07T18:05:44Z
dc.date.issued
2020-03
dc.identifier.citation
Gownaris, Natasha J.; Garcia Borboroglu, Jorge Pablo; Boersma, P. Dee; Sex ratio is variable and increasingly male biased at two colonies of Magellanic Penguins; Ecological Society of America. John Wiley & Sons Inc; Ecology; 101; 3; 3-2020; 1-11
dc.identifier.issn
0012-9658
dc.identifier.uri
http://hdl.handle.net/11336/139830
dc.description.abstract
Sex ratios are commonly skewed and variable in wild populations, but few studies track temporal trends in this demographic parameter. We examined variation in the operational sex ratio at two protected and declining breeding colonies of Magellanic Penguins (Spheniscus magellanicus) in Chubut, Argentina. Penguins from the two colonies, separated by 105 km, migrate north in the non-breeding season and have overlapping distributions at sea. Conditions during the non-breeding season can impact long-term trends in operational sex ratio (i.e., through sex-specific survival) and interannual variation in operational sex ratio (i.e., through sex-specific breeding decisions). We found an increasingly male-biased operational sex ratio at the two disparate colonies of Magellanic Penguins, which may contribute to continued population decline. We also found that the two colonies showed synchronous interannual variation in operational sex ratio, driven by variation in the number of females present each year. This pattern may be linked to sex-specific overwintering effects that cause females to skip breeding, i.e., to remain at sea rather than returning to the colony to breed, more often than males. Contrary to our predictions, colony-wide reproductive success was not lower in years with a more male-biased operational sex ratio. We did find that males showed more evidence of fighting and were less likely to pair when the operational sex ratio was more male biased. Our results highlight an indirect mechanism through which variation in the operational sex ratio can influence populations, through a higher incidence of fighting among the less abundant sex. Because biased sex ratios can reduce the size of the breeding population and influence rates of conflict, tracking operational sex ratio is critical for conservation.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Ecological Society of America. John Wiley & Sons Inc
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
COLONY MONITORING
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INTERANNUAL VARIATION
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MATE COMPETITION
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SEABIRDS
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SEX RATIO
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SKIPPED BREEDING
dc.subject.classification
Ecología
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Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.subject.classification
Conservación de la Biodiversidad
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Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Sex ratio is variable and increasingly male biased at two colonies of Magellanic Penguins
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-07-20T19:28:54Z
dc.identifier.eissn
1939-9170
dc.journal.volume
101
dc.journal.number
3
dc.journal.pagination
1-11
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Gownaris, Natasha J.. Gettysburg College; Estados Unidos
dc.description.fil
Fil: Garcia Borboroglu, Jorge Pablo. Global Penguin Society; Argentina. University of Washington; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.description.fil
Fil: Boersma, P. Dee. University of Washington; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Global Penguin Society; Argentina
dc.journal.title
Ecology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1002/ecy.2939
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://esajournals.onlinelibrary.wiley.com/toc/19399170/2020/101/3
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