Topic
Megadyptes
About: Megadyptes is a research topic. Over the lifetime, 7 publications have been published within this topic receiving 166 citations.
Papers
TL;DR: A phylogeny of extant penguins (18 forms) was estimated on the basis of 70 integumentary and breeding characters, which recovered monophyly of Sphenisciformes and all the traditional genera.
Abstract: A phylogeny of extant penguins (18 forms) was estimated on the basis of 70 integumentary and breeding characters. Integumentary characters included structure and color of bill and legs, and plumage of adult, immature, and downy chick. Breeding characters included eggs, nesting, and sociability of immatures. Gavia was placed at the root, and 11 species of representative procellariiform groups completed the outgroup. A heuristic parsimony analysis under implied character weights was performed. Ingroup resolution was complete. The analysis recovered monophyly of Sphenisciformes and all the traditional genera. The ingroup topology was ((Eudyptula + Spheniscus) (Aptenodytes (Pygoscelis (Megadyptes + Eudyptes)))). Two suprageneric groups, (Eudyptula + Spheniscus) and (Megadyptes + Eudyptes), were well supported. Additional analyses under equal weights resulted in a consensus topology that differed only in the internal resolution of Spheniscus. Integumentary and breeding characters performed optimally a...
55 citations
TL;DR: Reduction of predation of native species like yellow-eyed penguins by decreasing or increasing staple mammal prey numbers of the introduced predators may provide lasting conservation benefits, but could also trigger diet changes that increase risk to endangered wildlife.
Abstract: Spring and summer diets of feral house cats (Felis catus), ferrets (Mustela furo) and stoats (M. erminea) were studied in grassland surrounding breeding areas of yellow-eyed penguins (Megadyptes antipodes), a regionally threatened native species. All three predator species ate large numbers of young rabbits (Oryctolagus cuniculus) and birds. Stoats also relied heavily on mice (Mus musculus). Use of rabbits increased in rank order of increasing predator size, and male stoats ate more lagomorphs than female stoats. Diet differences may reflect character displacement as a result of exploitation competition, but interference competition or predation may force the smaller species to exploit micro-habitats with increased ground cover and consequent increased availability of smaller prey. Reduction of predation of native species like yellow-eyed penguins by decreasing or increasing staple mammal prey numbers of the introduced predators may provide lasting conservation benefits, but could also trigger diet changes that increase risk to endangered wildlife.
47 citations
TL;DR: The biochemical differentiation of four geographic populations of the Little Blue Penguin, Eudyptula minor from Onawe Peninsula, Motunau Island, Maud Island (South Island of New Zealand) and Poor Knights Island (North Island) was determined.
Abstract: The biochemical differentiation of four geographic populations of the Little Blue Penguin, Eudyptula minor from Onawe Peninsula, Motunau Island, Maud Island (South Island of New Zealand) and Poor Knights Island (North Island) was determined. Ten isozymes, with a total of 24 loci were analysed. Seven of these loci were polymorphic. A south-north cline was detected in the allelic frequencies of all the polymorphic loci. Population specific loci were detected. The Yellow-eyed Penguin, Megadyptes antipodes offered a comparison between genera. In Megadyptes only two loci were polymorphic, and it had a lower mean heterozygosity than E. minor. Loci specific for this genus were detected. The two genera shared the same alleles at seventeen of twenty loci.
19 citations
1 Jan 1997
15 citations
TL;DR: A new species of chewing louse from the yellow‐eyed penguin in New Zealand is described and illustrated and the key to the species of the genus Austrogoniodes is amended to incorporate this new species.
Abstract: We describe and illustrate Austrogoniodes vanalphenae, a new species of chewing louse from the yellow‐eyed penguin (Megadyptes antipodes) in New Zealand We amend the key to the species of the genus Austrogoniodes published in 1967 by Clay to incorporate this new species We also report the following new host records: Austrogoniodes bifasciatus (Piaget, 1885) from Spheniscus humboldti, and A demersus Keler, 1952 from Spheniscus mendiculus
12 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 1 |
| 2015 | 1 |
| 2004 | 1 |
| 2003 | 1 |
| 1997 | 2 |
| 1988 | 1 |