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dc.contributor.author
Demongin, Laurent
dc.contributor.author
Poisbleau, Maud
dc.contributor.author
Raya Rey, Andrea Nélida
dc.contributor.author
Schiavini, Adrian Carlos Miguel
dc.contributor.author
Quillfeldt, Petra
dc.contributor.author
Eens, Marcel
dc.contributor.author
Strange, Ian J.
dc.date.available
2021-03-25T18:07:56Z
dc.date.issued
2010-04
dc.identifier.citation
Demongin, Laurent; Poisbleau, Maud; Raya Rey, Andrea Nélida; Schiavini, Adrian Carlos Miguel; Quillfeldt, Petra; et al.; Geographical variation in egg size dimorphism in rockhopper penguins; Springer; Polar Biology; 33; 4; 4-2010; 469-476
dc.identifier.issn
0722-4060
dc.identifier.uri
http://hdl.handle.net/11336/128940
dc.description.abstract
All crested penguins present a unique reversed hatching asynchrony: the larger second-laid egg (B-egg) hatches before the smaller first-laid egg (A-egg). Although both eggs often hatch, the A-chick generally dies of starvation within days after hatching. However, within rockhopper penguins, the population at the Falkland Islands is unique in that some birds manage to raise both chicks. Although it has been suggested that the egg size dimorphism between A- and B-eggs may explain how long both eggs and chicks survive, this hypothesis has never been explicitly tested. We expect that both eggs are retained longer in the less dimorphic clutches than in the more dimorphic ones. In this paper, we have compiled egg measurements for three rockhopper penguin species (Eudyptes chrysocome, E. filholi and E. moseleyi) in order to compare the intra-clutch egg size dimorphism among these species. Furthermore, we have collected new data to compare egg size dimorphism between two populations of E. chrysocome (Falkland Islands versus Staten Island). A-egg volumes are more variable between species and populations than B-egg volumes. E. chrysocome and especially the population from the Falkland Islands produces the largest A-eggs and the least dimorphic eggs. Nevertheless, as differences in A-egg volumes between species and between the populations of Falkland Islands and Staten Island are stronger and more significant than differences in egg dimorphism, we suggest that A-egg volume, more than egg dimorphism, could be one of the factors influencing the prevalence of twins. A large A-egg and/or reduced egg dimorphism is probably necessary to enable rockhopper penguins to raise two chicks, but other reasons may also be involved which enable them to keep both eggs and chicks.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc/2.5/ar/
dc.subject
CHICK SURVIVAL
dc.subject
EGG DIMORPHISM
dc.subject
GEOGRAPHICAL VARIATION
dc.subject
ROCKHOPPER PENGUIN
dc.subject.classification
Ecología
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Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Geographical variation in egg size dimorphism in rockhopper 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
2021-03-12T19:17:33Z
dc.journal.volume
33
dc.journal.number
4
dc.journal.pagination
469-476
dc.journal.pais
Alemania
dc.description.fil
Fil: Demongin, Laurent. Max Planck Institute für Ornithologie; Alemania
dc.description.fil
Fil: Poisbleau, Maud. Max Planck Institute für Ornithologie; Alemania
dc.description.fil
Fil: Raya Rey, Andrea Nélida. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
dc.description.fil
Fil: Schiavini, Adrian Carlos Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
dc.description.fil
Fil: Quillfeldt, Petra. Max Planck Institute für Ornithologie; Alemania
dc.description.fil
Fil: Eens, Marcel. Universiteit Antwerp; Bélgica
dc.description.fil
Fil: Strange, Ian J.. New Island Conservation Trust; Islas Malvinas
dc.journal.title
Polar Biology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1007/s00300-009-0722-2
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00300-009-0722-2
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