Hybrid Rockhopper-Macaroni Penguins, Interbreeding and Mixed Species Pairs at Heard and Marion Islands

Woehler, Eric J.; Gilbert, Charles A.

doi:10.1071/mu9900198

Cited by 4 publications

(2 citation statements)

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“…between other penguin sister lineages that are accepted as distinct species, such as the Humboldt (Spheniscus humboldti) and Magellanic (S. magellanicus) penguins (Simeone et al, 2009), and among several species of Eudyptes penguins (Hull & Wilthshire, 1999;Napier, 1968;White & Clausen, 2002), including hybridization between E. filholi and E. chrysolophus (Woehler & Gilbert, 1990) and E. chrysocome and E. chrysolophus (White & Clausen, 2002). Further, high levels (up to 25%) of ancestral introgression were detected among several…”

Section: Gene Flow Among Rockhopper Taxamentioning

confidence: 99%

Taxonomy based on limited genomic markers may underestimate species diversity of rockhopper penguins and threaten their conservation

Frugone

Cole

López

et al. 2021

Diversity and Distributions

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Section: Gene Flow Among Rockhopper Taxamentioning

confidence: 99%

Taxonomy based on limited genomic markers may underestimate species diversity of rockhopper penguins and threaten their conservation

Frugone

Cole

López

et al. 2021

Diversity and Distributions

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“…Recently, Woehler et a/. 11 found that at Shirley Island, near Australia's Casey station, the Adelie penguin population had increased by 209 per cent everywhere but in the vicinity of the base, where numbers were stagnating.…”

Section: Honest Blundersmentioning

confidence: 99%

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Hadley

1991

Nature

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Geographical variation in egg size dimorphism in rockhopper penguins

et al. 2009

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All crested penguins present a unique reversed hatching asynchrony: the larger second-laid egg (B-egg) hatches before the smaller Wrst-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. Wlholi 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 diVerences in A-egg volumes between species and between the populations of Falkland Islands and Staten Island are stronger and more signiWcant than diVerences in egg dimorphism, we suggest that A-egg volume, more than egg dimorphism, could be one of the factors inXuencing 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.

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Hybrid Rockhopper-Macaroni Penguins, Interbreeding and Mixed Species Pairs at Heard and Marion Islands

Cited by 4 publications

References 1 publication

Taxonomy based on limited genomic markers may underestimate species diversity of rockhopper penguins and threaten their conservation

Taxonomy based on limited genomic markers may underestimate species diversity of rockhopper penguins and threaten their conservation

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Geographical variation in egg size dimorphism in rockhopper penguins

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