Data from: Extreme intraclutch egg-size dimorphism in Eudyptes penguins, an evolutionary response to clutch-size maladaptation ...

Eudyptes penguins (six species) are uniquely characterized by a two-egg clutch with extreme intraclutch egg-size dimorphism (ESD): the first-laid A-egg is 17.5%–56.9% smaller than the B-egg. Although A-eggs are viable, they almost never produce fledged chicks (genus average <1%). Using classical...

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Bibliographic Details
Main Authors: Stein, Robert William, Williams, Tony D.
Format: Dataset
Language:English
Published: Dryad 2013
Subjects:
Ecology evolutionary
Aptenodytes forsteri
Phylogenetics comparative
Eudyptes chrysolophus
Eudyptes robustus
Spheniscidae
Spheniscus Magellanicus
Pygoscelis antarctica
Eudyptes sclateri
Pygoscelis adeliae
Eudyptes moseleyi
Reproduction costs
Megadyptes antipodes
Life history evolution
Eudyptes schlegeli
Eudyptes pachyrhynchus
Pygoscelis papua
Spheniscus humboldti
Eudyptula albosignata
Spheniscus demersus
Eudyptula minor
Spheniscus mendiculus
Antarc*
Antarctica
Online Access:https://dx.doi.org/10.5061/dryad.cd233
https://datadryad.org/stash/dataset/doi:10.5061/dryad.cd233
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Summary:Eudyptes penguins (six species) are uniquely characterized by a two-egg clutch with extreme intraclutch egg-size dimorphism (ESD): the first-laid A-egg is 17.5%–56.9% smaller than the B-egg. Although A-eggs are viable, they almost never produce fledged chicks (genus average <1%). Using classical life-history theory and phylogenetic comparative methods, we demonstrate a marked slowdown in the life history of Eudyptes: age of first reproduction is 52% later and annual fecundity 48% lower compared with other two-egg clutch penguin species. All six Eudyptes species have retained a two-egg clutch, despite this pronounced life-history slowdown; this suggests evolutionary mismatch between clutch size and chicks fledged per clutch. Consistent with this, we show that Eudyptes fledge 43% fewer chicks per clutch than other two-egg clutch penguin species. Extreme intraclutch ESD in Eudyptes is associated primarily with a uniform (5%) increase in relative B-egg size, and B-egg size has evolved in accord with life ... : Life history characteristics of penguin speciesStein and Williams AmNat 53502 Table 1 data.csv ...

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