Genetic affinities of newly sampled populations of Wandering and Black-browed Albatross

Alderman, R.; Double, Michael C.; Valencia, José María; Gales, Rosemary

doi:10.1071/mu04034

Cited by 25 publications

(41 citation statements)

References 48 publications

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“…A temporally variable environment also could favour phenotypic plasticity, which can reduce local adaptation. In contrast, a stable environment can provide a species with enough time to adapt genetically to local conditions and/or develop reproductive isolation (e.g., Alderman et al 2005). The possibility that a temporally variable environment promotes gene flow needs to be explored further.…”

Section: Environmental Variabilitymentioning

confidence: 90%

Speciation in seabirds: why are there so many species…and why aren’t there more?

Friesen

2015

J Ornithol

143

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Speciation-the multiplication of species through the evolution of barriers to reproduction between populations-plays a central role in evolution since it enables two or more populations to adapt and evolve independently. However, mechanisms of speciation are notoriously difficult to study and poorly understood. Seabirds provide useful models to investigate factors that may promote or inhibit speciation because their ecology and evolutionary genetics are relatively well understood. Here I review population genetic studies of seabirds to test the importance of six factors with the potential to disrupt gene flow enough to result in speciation. Over 200 studies, including over 100 species, have been published to date. Most show evidence of restrictions in gene flow. Physical (geographic) barriers to dispersal are clearly important: conspecific populations that are separated by large expanses of land or ice show evidence of restricted gene flow, and sister species often are separated by physical barriers to gene flow. However, many species of seabirds show evidence of restrictions in gene flow in the absence of physical barriers to dispersal. Study results indicate that differences in ocean regimes, nonbreeding distributions, foraging distributions during the breeding season, and breeding phenology also can disrupt gene flow enough to lead to speciation. Of these, physical isolation and differences in ocean regime appear to be the most important. Philopatry alone may be sufficient to result in reproductive isolation, but usually it acts in combination with other barriers to gene flow. The effects of many other potential influences on gene flow need to be investigated more thoroughly, including colony distribution/location, wind, interspecific interactions, environmental stability/variability, variation in phenotypic traits associated with mate choice (morphology, behaviour, vocalisations) and intrinsic (genomic) incompatabilities. Recent advances in genome sequencing, especially if used in combination with ecological tools such as geolocators and new methods for data interpretation, are opening exiting new avenues to test the importance of various behavioural, ecological, demographic and genomic factors in reducing or promoting gene flow and so affecting speciation.

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Section: Environmental Variabilitymentioning

confidence: 90%

Speciation in seabirds: why are there so many species…and why aren’t there more?

Friesen

2015

J Ornithol

143

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“…Recent studies have shown that reduced genetic variability is common in wild species (Alderman et al, 2005;Milot et al, 2007;Schultz et al, 2009;Fujii and Forstner, 2010;Jian et al, 2010). The D-loop occurs in the main non-coding area of the mitochondrial genome and is the most polymorphic region of the mtDNA (Sbisa et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

The genetic crisis of the Mexican Bolson Tortoise (Gopherus flavomarginatus: Testudinidae)

Ureña-Aranda

2012

Amphib Reptilia

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Gopherus flavomarginatus (Testudinidae) is endemic to a series of discontinuous, isolated basins collectively known as the Bolson de Mapimí in the Chihuahuan Desert. Its numbers declined after catastrophic levels of exploitation during the mid-20th century. However currently, the Bolson Tortoise appears to be on a path to recovery owing to intensive, sustained conservation efforts. We sequenced an 842-bp-long fragment of the D-loop from 76 individuals distributed throughout the species' range. The results revealed only two haplotypes. An AMOVA showed that 95% of the variance occurred among populations, whereas the remaining 5% was explained by genetic differences within populations. Tectonic processes together with ecological transformation during the Pleistocene and Holocene may be responsible for the reduction in this species' genetic variation. A bottleneck during which a significant percentage of the haplotype diversity was lost would result in genetic homogeneity. Although there is demographic growth, the lack of genetic diversity is indicative of the potential crisis that the Bolson Tortoise is facing, and awareness must be brought to this situation.

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“…Recent genetic studies have confirmed the distinctiveness of three species in the wandering albatross complex (Burg and Croxall 2004, Alderman et al 2005, Milot et al 2008). The most comprehensive study found three divergent groups: Diomedea exulans (Marion and Prince Edward, Crozet and South Georgia Islands), D. antipodensis (Campbell, Adams and Antipodes Islands off New Zealand), and D. dabbenena (Tristan da Cunha) (Fig.…”

mentioning

confidence: 86%

“…1, Burg and Croxall 2004). Two subsequent studies found birds breeding on Macquarie and Kerguelen Islands belonged to the D. exulans group (Alderman et al 2005, Bried et al 2007). The genetics of the exulans group is well studied; however little population genetic data are available for breeding pairs on Amsterdam Island (Nunn et al 1996, Milot et al 2007).…”

mentioning

confidence: 97%

“…The high levels of natal philopatry and restricted number of breeding sites have had a profound effect on the levels of gene flow within this family of birds. Reproductive isolation due to natal philopatry, coupled with genetic drift from range expansion in the Pleistocene, has likely caused these taxa to become highly diverged (Burg and Croxall 2001, Abbott and Double 2003, Burg and Croxall 2004, Alderman et al 2005, Bried et al 2007, Milot et al 2007).…”

mentioning

confidence: 99%

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Piecing together the global population puzzle of wandering albatrosses: genetic analysis of the Amsterdam albatross Diomedea amsterdamensis

Rains¹,

Weimerskirch²,

Burg³

2011

Journal of Avian Biology

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Wandering albatrosses have been subjected to numerous taxonomic revisions due to discoveries of new species, analyses of morphological data and, more recently, the inclusion of genetic data. The small population of albatrosses (170 individuals including 26 pairs breeding annually) on Amsterdam Island in the Indian Ocean, Diomedea amsterdamensis, has been given species status based on plumage and morphometrics, but genetic data published to date provide weak support and its specific status remains controversial for some authors. We used mitochondrial control region sequence data to elucidate the relationship of the Amsterdam albatross within the wandering albatross complex (Diomedea amsterdamensis, D. antipodensis, D. dabbenena and D. exulans). Three novel haplotypes were present in 35 individuals from Amsterdam Island, and were highly divergent (3.6–7.3%) from haplotypes found in the other three members of the wandering albatross complex. Low levels of genetic variation in Amsterdam albatross likely resulted, at least in part, from a population bottleneck. Geographic isolation in the wandering albatross complex is maintained by high natal philopatry. As Amsterdam Island is the only breeding ground for this critically endangered species, we strongly urge conservation efforts in the area, especially in relation to long line fisheries and other threats such as disease and introduced predators, and it be listed as a distinct species.

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Genetic affinities of newly sampled populations of Wandering and Black-browed Albatross

Cited by 25 publications

References 48 publications

Speciation in seabirds: why are there so many species…and why aren’t there more?

Speciation in seabirds: why are there so many species…and why aren’t there more?

The genetic crisis of the Mexican Bolson Tortoise (Gopherus flavomarginatus: Testudinidae)

Piecing together the global population puzzle of wandering albatrosses: genetic analysis of the Amsterdam albatross Diomedea amsterdamensis

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