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dc.contributor.author
Martínez Curci, Natalia Soledad
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dc.contributor.author
Isacch, Juan Pablo
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dc.contributor.author
D'amico, Veronica Laura
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dc.contributor.author
Rojas, Pablo
dc.contributor.author
Castresana, Gabriel J.
dc.date.available
2021-03-08T15:21:59Z
dc.date.issued
2020-10
dc.identifier.citation
Martínez Curci, Natalia Soledad; Isacch, Juan Pablo; D'amico, Veronica Laura; Rojas, Pablo; Castresana, Gabriel J.; To migrate or not: drivers of over-summering in a long-distance migratory shorebird; Wiley Blackwell Publishing, Inc; Journal Of Avian Biology; 51; 10; 10-2020; 1-11
dc.identifier.issn
0908-8857
dc.identifier.uri
http://hdl.handle.net/11336/127752
dc.description.abstract
The phenomenon of over-summering in southern non-breeding areas by boreal-breeding birds is particularly prevalent among shorebirds. Despite its frequency, it is understudied compared with most other aspects of shorebird ecology. Our aim was to expand knowledge of this subject through a study of red knots Calidris canutus rufa over-summering at a site in Argentina during the austral winter. We measured the proportion of one-year-old and adult over-summerers and evaluated the roles of flight-feather condition and physiological status (through leukocite profile, physiological stress index and presence of blood parasites) as triggers for over-summering. We also explore sex-ratio, the evolution of body mass and extent of breeding plumage within each age-class. Over-summerers were 57% yearlings and 43% adults, 46% females and 54% males. Almost all yearlings exhibited incomplete molt of primary feathers and some were in active primary molt. This suggests that the condition of flight-feathers and the timing of molt are likely to be important factors selecting for deferred migration during the first year of life. Other factors, not associated with flight-feather molt, seem to trigger over-summering in adults, which had completed flight feather molt but had low fat loads and/or incomplete alternate plumage. We found no evidence of a weakened immune system, high loads of blood parasites or high stress levels that can explain this poor migratory conditioning and therefore over-summering. Our data indicates that our adult age-class comprises both young individuals postponing first breeding until they are at least two years old and sexually mature individuals with prior reproductive experience skipping a breeding opportunity. Breeding propensity and age at first breeding are both poorly known, but key demographic parameters that determine population growth. This study suggests that potentially they can be estimated from mark–recapture at non-breeding areas and this warrants further study.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ARGENTINA
dc.subject
BODY CONDITION
dc.subject
CALIDRIS CANUTUS
dc.subject
LIFE-HISTORY STRATEGIES
dc.subject
MOLT
dc.subject
PHYSIOLOGICAL PARAMETERS
dc.subject
SOUTH AMERICA
dc.subject.classification
Conservación de la Biodiversidad
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
To migrate or not: drivers of over-summering in a long-distance migratory shorebird
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-12-04T14:46:53Z
dc.journal.volume
51
dc.journal.number
10
dc.journal.pagination
1-11
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Martínez Curci, Natalia Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina
dc.description.fil
Fil: Isacch, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina
dc.description.fil
Fil: D'amico, Veronica Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
dc.description.fil
Fil: Rojas, Pablo. Gobierno de la Provincia de Buenos Aires. Organismo Provincial Para El Desarrollo Sostenible; Argentina
dc.description.fil
Fil: Castresana, Gabriel J.. Gobierno de la Provincia de Buenos Aires. Organismo Provincial Para El Desarrollo Sostenible; Argentina
dc.journal.title
Journal Of Avian Biology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/jav.02401
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1111/jav.02401
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