Systematic Implications of Geographic Patterns of Genetic Variation in the Genus Dicamptodon

Daugherty, Charles H.; Allendorf, Fred W.; Dunlap, William W.; Knudsen, Kathy L.

doi:10.2307/1444332

Cited by 21 publications

(19 citation statements)

References 16 publications

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“…-, ., o groups, while internally relatively homogeneous, remained extremely electrophoretically distinct despite close geographic proximity. My analysis agreed with that of Daugherty et al (1983) in recognizing the existence offour distinct groups ofpopulations, which, for reasons discussed below, I consider to be distinct species (D. copei, D. aterrimus, D. tenebrosus, and D. ensatus ; Fig. 1).…”

Section: Geographicsupporting

confidence: 73%

“…Nussbaum also noted minor morphological subdivision in each of these groups. Daugherty et al (1983) analyzed 34 allozyme loci in 23 populations of Dicamptodon in order to examine the systematic implications ofgenetic differentiation in the genus, particularly with respect to the patterns discussed by Nussbaum (1976). The deep division they found among certain subsets of populations (Fig.…”

mentioning

confidence: 99%

“…Dark hatching = D. ensatus, light hatching = D. copei, and stippling = D. tenebrosus on the coast and D. aterrimus inland. the analysis of overall geographic variation in Dicamptodon were considered to be adequate because this part of the study was intended primarily as a check ofthe patterns observed by Daugherty et al, (1983), who used larger samples.…”

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confidence: 99%

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HYBRIDIZATION AND CRYPTIC SPECIES IN DICAMPTODON (CAUDATA: DICAMPTODONTIDAE)

Good

1989

Evolution

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The salamander genus Dicamptodon consists of at least four genetically divergent groups of populations with 10-19 fixed allelic differences (out of 31 loci scored) between populations in alternative groups. One of these groups corresponds to D. copei; the other three until now usually have been considered to belong to the single morphologically homogeneous species D. ensatus. Two instances of geographic contact between genetic units occur in the genus, one between D. copei and "D. ensatus" in northern Oregon and the other between two highly divergent types of "D. ensatus" in coastal northern Calfornia. In the former case no hybridization occurs, while in the latter a narrow hybrid zone has been observed. There appears to be selection against hybrids within this hybrid zone, and introgression beyond the zone is apparently nonexistent. The population groups therefore appear to be genetically independent units, and Dicamptodon is best considered to consist of four species: D. copei, D. ensatus, D. tenebrosus, and D. aterrimus.

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Section: Geographicsupporting

confidence: 73%

mentioning

confidence: 99%

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HYBRIDIZATION AND CRYPTIC SPECIES IN DICAMPTODON (CAUDATA: DICAMPTODONTIDAE)

Good

1989

Evolution

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“…The taxonomic status of the lineages also differs; the amphibian lineages contain two to four species and Microtus and the plant lineages contain a single species. While the taxonomy would seem to predict the results presented here, each of the amphibian lineages were described as a single species until genetic studies demonstrated cryptic diversity (Daugherty et al 1983;Howard et al 1993;Nielson et al 2001). The fact that our restricted examination of only six mesic forest lineages supports different underlying biogeographic hypotheses is not necessarily surprising, given the numerous climatic and geologic fluctuations the PNW has experienced over the past 2.5 million years.…”

Section: Evolution Of the Northern Rocky Mountain Mesic Forest Ecosystemmentioning

confidence: 67%

Investigating the Evolutionary History of the Pacific Northwest Mesic Forest Ecosystem: Hypothesis Testing Within a Comparative Phylogeographic Framework

Carstens

Brunsfeld

Demboski

et al. 2005

Evol

190

226

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We examine the evolution of mesic forest ecosystems in the Pacific Northwest of North America using a statistical phylogeography approach in four animal and two plant lineages. Three a priori hypotheses, which explain the disjunction in the mesic forest ecosystem with either recent dispersal or ancient vicariance, are tested with phylogenetic and coalescent methods. We find strong support in three amphibian lineages (Ascaphus spp., and Dicampton spp., and Plethodon vandykei and P. idahoensis) for deep divergence between coastal and inland populations, as predicted by the ancient vicariance hypothesis. Unlike the amphibians, the disjunction in other Pacific Northwest lineages is likely due to recent dispersal along a northern route. Topological and population divergence tests support the northern dispersal hypothesis in the water vole (Microtus richardsoni) and northern dispersal has some support in both the dusky willow (Salix melanopsis) and whitebark pine (Pinus albicaulis). These analyses demonstrate that genetic data sampled from across an ecosystem can provide insight into the evolution of ecological communities and suggest that the advantages of a statistical phylogeographic approach are most pronounced in comparisons across multiple taxa in a particular ecosystem. Genetic patterns in organisms as diverse as willows and salamanders can be used to test general regional hypotheses, providing a consistent metric for comparison among members of an ecosystem with disparate life-history traits.

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“…Divergence among minor groups further from the coast (between the NW-northern and NW-middle Rocky Mountains) echoes variation found in diverse organisms, including amphibians, mammals and trees (Carstens et al, 2005a,b). However, the vicariance between western and inland populations of tailed frogs (Ascaphus; Nielson et al, 2001Nielson et al, , 2006, giant salamanders (Dicamptodon; Daugherty et al, 1983), and lungless salamanders (Plethodon; Howard et al, 1993) resulted from drying of the Columbia Plateau after the rise of the Cascade Mountains during the Pliocene. These amphibians are all associated with streams or seeps in forest habitats and inland and western species are distinctly allopatric.…”

Section: Mtdna Phylogeography and Biogeographic Historymentioning

confidence: 99%