Molecular Genetic Relationships of the Extinct Dusky Seaside Sparrow

Avise, John C.; Nelson, W. John

doi:10.1126/science.243.4891.646

Cited by 224 publications

(172 citation statements)

References 16 publications

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“…Molecular methods have previously revealed cryptic speciation in birds, but it has typically been associated with geographical variation (e.g. Avise & Nelson 1989;Omland et al 2000). Habitat choice has been implicated in speciation of other organisms, for instance, in insects that specialize on different hosts (Via 1999).…”

Section: Discussionmentioning

confidence: 99%

Habitat selection and ecological speciation in Galápagos warbler finches ( Certhidea olivacea and Certhidea fusca )

Tonnis

Grant

et al. 2005

Proc. R. Soc. B.

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We investigated phylogeographic divergence among populations of Galápagos warbler finches. Their broad distribution, lack of phenotypic differentiation and low levels of genetic divergence make warbler finches an appropriate model to study speciation in allopatry. A positive relationship between genetic and geographical distances is expected for island taxa. Warbler finches actually showed a negative isolation by distance relationship, causing us to reject the hypothesis of distance-limited dispersal. An alternative hypothesis, that dispersal is limited by habitat similarity, was supported. We found a positive correlation between genetic distances and differences in maximum elevation among islands, which is an indicator of ecological similarity. MtDNA sequence variation revealed monophyletic support for two distinct species. Certhidea olivacea have recently dispersed among larger central islands, while some Certhidea fusca have recently dispersed to small islands at opposite ends of the archipelago. We conclude that females have chosen to breed on islands with habitats similar to their natal environment. Habitat selection is implicated as an important component of speciation of warbler finches, which is the earliest known divergence of the adaptive radiation of Darwin's finches. These results suggest that small populations can harbour cryptic but biologically meaningful variation that may affect longer term evolutionary processes.

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Section: Discussionmentioning

confidence: 99%

Habitat selection and ecological speciation in Galápagos warbler finches ( Certhidea olivacea and Certhidea fusca )

Tonnis

Grant

et al. 2005

Proc. R. Soc. B.

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“…Misunderstanding systematic relationships, besides embarrassing germplasm managers and/or bureaucrats (O'Brien and Mayr 1991), can leave endangered germplasm such as Cucurbita okeechobeensis (Small) L. H. Bailey unprotected (Walters and Decker-Walters 1993), may engender faulty germplasm management practices (Avise and Nelson 1989;Avise 1989), or may complicate the choice of germplasm for basic research or crop improvement programs, as with the "nomenclatural mess" attending systematic relationships among potatoes and their wild relatives (Spooner and van den Berg 1992;Spooner et al 1993). …”

Section: Plant Genetic Resource Management a Genetic Markers Anmentioning

confidence: 99%

Genetic Markers and Plant Genetic Resource Management

Bretting

Widrlechner

1995

Plant Breeding Reviews

137

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“…Endangered Species Act has stimulated greater interest in these topics. To date, most of these cases have involved non-avian taxa (e.g., Allendorf and Leary 1988;Bernatchez 1995;Firestone et al 1999;Parker et al 1999;Roman et al 1999; although see Avise and Nelson 1989;Young and Allard 1997;Nelson et al 2000;Zink et al 2000). In this study, we examine population structure as well as relationships within and among geographically-defined subspecies for a threatened avian species with little morphological variation yet historical divergence among subspecies.…”

Section: Introductionmentioning

confidence: 99%

Subspecific relationships and genetic structure in the spotted owl

Haig¹,

Mullins²,

Forsman³

2004

Conservation Genetics

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Hierarchical genetic structure was examined in the three geographically-defined subspecies of spotted owl (Strix occidentalis) to define relationships among subspecies and quantify variation within and among regional and local populations. Sequences (522 bp) from domains I and II of the mitochondrial control region were analyzed for 213 individuals from 30 local breeding areas. Results confirmed significant differences between northern spotted owls and the other traditional geographically defined subspecies but did not provide support for subspecific level differences between California and Mexican spotted owls. Divergence times among subspecies estimated with a 936 bp portion of the cytochrome b gene dated Northern and California/Mexican spotted owl divergence time to 115,000-125,000 years ago, whereas California/Mexican spotted owl divergence was estimated at 15,000 years ago. Nested clade analyses indicated an association between California spotted owl and Mexican spotted owl haplotypes, implying historical contact between the two groups. Results also identified a number of individuals geographically classified as northern spotted owls (S. o. caurina) that contained haplotypes identified as California spotted owls (S. o. occidentalis). Among all northern spotted owls sampled (n ¼ 131), 12.9% contained California spotted owl haplotypes. In the Klamath region, which is the contact zone between the two subspecies, 20.3% (n ¼ 59) of owls were classified as California spotted owls. The Klamath region is a zone of hybridization and speciation for many other taxa as well. Analyses of population structure indicated gene flow among regions within geographically defined subspecies although there was significant differentiation among northern and southern regions of Mexican spotted owls. Among all areas examined, genetic diversity was not significantly reduced except in California spotted owls where the southern region consists of one haplotype. Our results indicate a stable contact zone between northern and California spotted owls, maintaining distinct subspecific haplotypes within their traditional ranges. This supports recovery efforts based on the traditional subspecies designation for the northern spotted owl. Further, although little variation was found between California and Mexican spotted owls, we suggest they should be managed separately because of current isolation between groups.

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Molecular Genetic Relationships of the Extinct Dusky Seaside Sparrow

Cited by 224 publications

References 16 publications

Habitat selection and ecological speciation in Galápagos warbler finches ( Certhidea olivacea and Certhidea fusca )

Habitat selection and ecological speciation in Galápagos warbler finches ( Certhidea olivacea and Certhidea fusca )

Genetic Markers and Plant Genetic Resource Management

Subspecific relationships and genetic structure in the spotted owl

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