Data from: Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins
Penguins of the genus Eudyptes are unique among birds in that their first-laid A-egg is 54–85% the mass of their second-laid B-egg. Although the degree of intra-clutch egg-size dimorphism varies greatly among the seven species of the genus, obligate brood reduction is typical of each, with most fled...
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ftdryad:oai:v1.datadryad.org:10255/dryad.106182 2023-05-15T18:07:16+02:00 Data from: Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins Morrison, Kyle W. Campbell Island New Zealand Holocene 2015-12-28T18:06:16Z http://hdl.handle.net/10255/dryad.106182 https://doi.org/10.5061/dryad.d4196 unknown doi:10.5061/dryad.d4196/1 doi:10.1111/jav.00740 doi:10.5061/dryad.d4196 Morrison KW (2016) Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins. Journal of Avian Biology 47(4): 466–475. http://hdl.handle.net/10255/dryad.106182 carry-over effect reproductive investment individual repeatability egg-size dimorphism Eastern Rockhopper Penguin Article 2015 ftdryad https://doi.org/10.5061/dryad.d4196 https://doi.org/10.5061/dryad.d4196/1 https://doi.org/10.1111/jav.00740 2020-01-01T15:29:20Z Penguins of the genus Eudyptes are unique among birds in that their first-laid A-egg is 54–85% the mass of their second-laid B-egg. Although the degree of intra-clutch egg-size dimorphism varies greatly among the seven species of the genus, obligate brood reduction is typical of each, with most fledged chicks resulting from the larger B-egg. Many authors have speculated upon why Eudyptes penguins have evolved and maintained a highly dimorphic 2-egg clutch, and why it is the first-laid egg that is so much smaller than the second, but only recently has a testable, proximate mechanism been proposed. In most species of Eudyptes penguins females appear to initiate egg-formation at sea during return migration to breeding colonies. In macaroni penguins E. chrysolophus, females with a shorter pre-laying interval ashore (and thus presumably greater overlap between migration and egg-formation) lay more dimorphic eggs, suggesting a physiological conflict may constrain growth of the earlier-initiated A-egg. This migratory carry-over effect hypothesis (MCEH) was tested in eastern rockhopper penguins E. chrysocome filholi on Campbell Island, New Zealand, by recording the arrival and lay dates, body sizes, and egg masses of transponder-tagged females over two years. Females with longer pre-laying intervals laid less dimorphic clutches, as predicted by the MCEH. However, repeated measures of individual females revealed that within-individual variation in egg-size dimorphism between years was unrelated to within-individual variation in pre-laying interval. Egg masses, and to a lesser extent egg-size dimorphism, were highly repeatable traits related to body size and body mass. These results and a detailed consideration of the MCEH suggest that egg-size dimorphism in Eudyptes penguins is unlikely to be caused by a migratory carry-over effect. Article in Journal/Newspaper Rockhopper penguin Dryad Digital Repository (Duke University) Campbell Island ENVELOPE(169.500,169.500,-52.500,-52.500) New Zealand |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
carry-over effect reproductive investment individual repeatability egg-size dimorphism Eastern Rockhopper Penguin |
spellingShingle |
carry-over effect reproductive investment individual repeatability egg-size dimorphism Eastern Rockhopper Penguin Morrison, Kyle W. Data from: Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins |
topic_facet |
carry-over effect reproductive investment individual repeatability egg-size dimorphism Eastern Rockhopper Penguin |
description |
Penguins of the genus Eudyptes are unique among birds in that their first-laid A-egg is 54–85% the mass of their second-laid B-egg. Although the degree of intra-clutch egg-size dimorphism varies greatly among the seven species of the genus, obligate brood reduction is typical of each, with most fledged chicks resulting from the larger B-egg. Many authors have speculated upon why Eudyptes penguins have evolved and maintained a highly dimorphic 2-egg clutch, and why it is the first-laid egg that is so much smaller than the second, but only recently has a testable, proximate mechanism been proposed. In most species of Eudyptes penguins females appear to initiate egg-formation at sea during return migration to breeding colonies. In macaroni penguins E. chrysolophus, females with a shorter pre-laying interval ashore (and thus presumably greater overlap between migration and egg-formation) lay more dimorphic eggs, suggesting a physiological conflict may constrain growth of the earlier-initiated A-egg. This migratory carry-over effect hypothesis (MCEH) was tested in eastern rockhopper penguins E. chrysocome filholi on Campbell Island, New Zealand, by recording the arrival and lay dates, body sizes, and egg masses of transponder-tagged females over two years. Females with longer pre-laying intervals laid less dimorphic clutches, as predicted by the MCEH. However, repeated measures of individual females revealed that within-individual variation in egg-size dimorphism between years was unrelated to within-individual variation in pre-laying interval. Egg masses, and to a lesser extent egg-size dimorphism, were highly repeatable traits related to body size and body mass. These results and a detailed consideration of the MCEH suggest that egg-size dimorphism in Eudyptes penguins is unlikely to be caused by a migratory carry-over effect. |
format |
Article in Journal/Newspaper |
author |
Morrison, Kyle W. |
author_facet |
Morrison, Kyle W. |
author_sort |
Morrison, Kyle W. |
title |
Data from: Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins |
title_short |
Data from: Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins |
title_full |
Data from: Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins |
title_fullStr |
Data from: Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins |
title_full_unstemmed |
Data from: Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins |
title_sort |
data from: individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in eudyptes penguins |
publishDate |
2015 |
url |
http://hdl.handle.net/10255/dryad.106182 https://doi.org/10.5061/dryad.d4196 |
op_coverage |
Campbell Island New Zealand Holocene |
long_lat |
ENVELOPE(169.500,169.500,-52.500,-52.500) |
geographic |
Campbell Island New Zealand |
geographic_facet |
Campbell Island New Zealand |
genre |
Rockhopper penguin |
genre_facet |
Rockhopper penguin |
op_relation |
doi:10.5061/dryad.d4196/1 doi:10.1111/jav.00740 doi:10.5061/dryad.d4196 Morrison KW (2016) Individual repeatability in laying behaviour does not support the migratory carry-over effect hypothesis of egg-size dimorphism in Eudyptes penguins. Journal of Avian Biology 47(4): 466–475. http://hdl.handle.net/10255/dryad.106182 |
op_doi |
https://doi.org/10.5061/dryad.d4196 https://doi.org/10.5061/dryad.d4196/1 https://doi.org/10.1111/jav.00740 |
_version_ |
1766179261726588928 |