Positive selection on the killer whale mitogenome

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Positive selection on the killer whale mitogenome.

Mitochondria produce up to 95 per cent of the eukaryotic cell's energy. The coding genes of the mitochondrial DNA may therefore evolve under selection owing to metabolic requirements. The killer whale, Orcinus orca, is polymorphic, has a global distribution and occupies a range of ecological niches. It is therefore a suitable organism for testing this hypothesis. We compared a global dataset of...

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Orcinus orca – Killer Whale

Taxonomic notes: Orcinus orca is currently considered a single, cosmopolitan species, however many populations (including some which occur sympatrically) are ecologically, genetically and morphologically distinct (Rice 1998; Ford 2009). Despite such distinction, the global genetic diversity of the species appears low at both mitochondrial and nuclear DNA markers (Hoelzel et al. 2002; Morin et a...

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Quantifying the effects of prey abundance on killer whale reproduction

1. Management decisions for threatened and endangered species require risks to be identified and prioritized, based on the degree to which they influence population dynamics. The potential for recovery of small populations at risk may be determined by multiple factors, including intrinsic population characteristics (inbreeding, sex ratios) and extrinsic variables (prey availability, disease, hu...

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Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift

The evolution of diversity in the marine ecosystem is poorly understood, given the relatively high potential for connectivity, especially for highly mobile species such as whales and dolphins. The killer whale (Orcinus orca) has a worldwide distribution, and individual social groups travel over a wide geographic range. Even so, regional populations have been shown to be genetically differentiat...

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ژورنال

عنوان ژورنال: Biology Letters

سال: 2010

ISSN: 1744-9561,1744-957X

DOI: 10.1098/rsbl.2010.0638