Morphometric variation in the Nearctic collared lemming (<i>Dicrostonyx</i>)

Eger, Judith L.

doi:10.1111/j.1469-7998.1995.tb05134.x

Cited by 13 publications

(11 citation statements)

References 26 publications

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“…The main phylogenetic division between the Eurasian D. torquatus and the North American group of species had resulted from isolation by intermittent inundation of the Bering Strait during the interglacial periods (FEDOROV et al 1999a). In North America the following glacial vicariant separation in three refugial areas probably generated the extant species diversity, D. groenlundicus evolved in ice-free areas to the north west of the Laurentide ice sheet, whereas D. hudsonius and D. richardsoni likely derived from the southeastern and southwestern periglacial areas, respectively (MACPHERSON 1965;CHALINE 1987;ENGSTROM et al 1993;EGER 1995). However, the estimate of divergence among the three North America species suggests that the vicariant events predated the last glaciation (Wisconsin; 10-1 1 5 kyr; ANDERSEN and BORNS 1997).…”

Section: Pattern and Timing Of Speciationmentioning

confidence: 99%

The Importance of Ice Ages in Diversification of Arctic Collared Lemmings (Dicrostonyx): Evidence from the Mitochondrial Cytochrome B Region

Fedorov

Goropashnaya

2004

Hereditas

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Variation in the nucleotide sequence of the mitochondrial cytochrome b region (804 bp) was examined for 24 individuals of collared lemmings Dicrostonyx sampled over the circumpolar distribution range of this genus. The mtDNA phylogeny supports the division of Dicrostonyx into four species suggested on the basis of karyotypes and hybridisation experiments, the Eurasian D. torquatus and the North American D. groenlandicus, D. hudsonius and D. richardsoni. The interspecific divergence estimates (mean 4.89%) suggest that radiation took place during the Pleistocene and gives support for the importance of vicariant events generated by the glacial-interglacial periods for speciation in the chromosomally variable Dicrostonyx. The monophyly of the North America species group indicates one dispersion event across the Bering Land Bridge and does not support the hypothesis that the morphologically primitive D. hudsonius is a relict of an earlier invasion from Eurasia while D. groenlandicus represents a later dispersion event. The division of the North America D. groenlandicus in the two phylogeographic groups with limited divergence (0.63%) across the Mackenzie river is consistent with separation of this species in more than one refugial area located to the north west of the Laurentide ice sheet during the last glaciation. Within the Eurasian D. torquatus, the group of haplotypes from the area to the east of the Kolyma river has the basal position. This gives support for the importance of the Asian Beringia as a refugial area for the tundra specialist, D. torquatus, during one of the warm interglacials in the late Pleistocene.

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Section: Pattern and Timing Of Speciationmentioning

confidence: 99%

The Importance of Ice Ages in Diversification of Arctic Collared Lemmings (Dicrostonyx): Evidence from the Mitochondrial Cytochrome B Region

Fedorov

Goropashnaya

2004

Hereditas

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“…The amount of divergence among the three North American species suggests that the vicariant events predated the latest glaciation (Weichsel; 10-115 kyr; Andersen & Borns, 1997). D. gmnlandicus evolved in ice free areas t o the north of the main ice sheet, whereas the D. hudsonius and D. richardsoni likely derived from the southeastern and southwestern periglacial areas, respectively (Chaline, 1987;Engstrom et al, 1993;Eger, 1995).…”

Section: Phylogeography Of Collared Lemmingsmentioning

confidence: 99%

“…Assuming that the host and parasite colonized Greenland postglacially from the ice-free areas of the Canadian Arctic islands (Fedorov & Goropashnaya, 1999), the genetic divergence of the Greenland population of A. arctica (host D. gmenlandicus) can be explained by the founder effect (migration of a small number of individuals). It is also possible that collared lemmings 'overwintered in the coastal part of North Greenland (Macpherson, 1965;Eger, 1995); in this case the parasite divergence would reflect genetic drift in a small refugial lemming population.…”

Section: Phylogeography Of Collared Lemmingsmentioning

confidence: 99%

Genetic and morphometric variation in the Holarctic helminth parasite Andrya arctica (Cestoda, Anoplocephalidae) in relation to the divergence of its lemming hosts (Dicrostonyx spp.)

Wickstrom

Hantula

Haukisalmi

et al. 2001

Zoological Journal of the Linnean Society

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A ndrya arctica is a cestode parasite of the family Anoplocephalidae (Cyclophyllidea), parasitizing lemmings of the genus Dicmstonyx throughout the Holarctic region. The population structure of this intestinal parasite was studied from eight different regions, six of which represented different genetic entities of lemming hosts. Molecular sequence tagged site markers and minisatellite fingerprints as well as morphology and morphometrics were used to reveal the population structure of A. arctica in the Holarctic region. The results suggest that the evolutionary history of this cestode species has included different processes acting on different geographical regions. On the Siberian mainland (host D. torquatus), the division of the parasites into different genetic entities agreed perfectly with the chromosomal races of the lemming hosts that points towards a shared evolutionary history between the host and the parasite ('cospeciation'). The main phylogenetic split of Dicmstonyx between Eurasia and North America was not, however, observed in A. arctica. This suggests that in the Nearctic (host D. gmenlandicus) the parasite has remained relatively unmodified because of the large cohesive populations ('coadaptation'). The uniqueness of the Greenland population, and possibly also that of the Wrangel Island, can be explained by peripheral isolation, refugial effects or founder effects.

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“…Currently, eight valid species are recognized in the genus Dicrostonyx based on morphological, caryological, hybridological and genetic data (Rausch & Rausch ; Tchernyavskiy & Kozlovskiy ; Krohne ; Gileva ; van Wynsberghe & Engstrom ; Borowik & Engstrom ; Engstrom et al . ; Eger ; Fedorov et al . ; Ehrich et al .…”

mentioning

confidence: 99%

“…Currently, eight valid species are recognized in the genus Dicrostonyx based on morphological, caryological, hybridological and genetic data (Rausch & Rausch 1972;Tchernyavskiy & Kozlovskiy 1980;Krohne 1982;Gileva 1983; van Wynsberghe & Engstrom 1992;Borowik & Engstrom 1993;Engstrom et al 1993;Eger 1995;Fedorov et al 1999;Ehrich et al 2000;Abramson & Tikhonova 2002;Musser & Carleton 2005). Only two species inhabit Eurasia: D. torquatus (Pallas, 1779) on the continent and D. vinogradovi (Ognev, 1948) on Wrangel Island; the six other species live in North America.…”

mentioning

confidence: 99%

Evolution of occlusal shape of the first and second upper molars of Middle–Late Pleistocene collared lemmings (Dicrostonyx, Arvicolinae, Rodentia) in northeast European Russia

Пономарев

Puzachenko

2015

Boreas

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An approach combining traditional morphotypical methods, multivariate analysis and informational‐statistical methods was used to study evolutionary changes in the occlusal shape of the first and second upper molars of Recent and Middle–Late Pleistocene Dicrostonyx (32 samples) from localities in northeast European Russia (northeastern Russian Plain, the Timan Ridge and the northern part of the Urals). The evolutionary history is described in terms of morphological evolutionary levels of teeth suggested by Smirnov et al. (1997, Materialy Po Istorii I Sovremennomu Sostojaniju Fauny Severa Zapadnoj Sibiri: Sbornik Nauchnyh Trudov, Chelyabinsk, slightly modified). Based on 14C‐dated samples, levels of molar evolution did not always successively replace each other in time, but rather there were often synchronous populations at any given level. This finding supports the notion of a mosaic pattern of morphotypical diversity and relatively independent, parallel evolution of lemming teeth amongst different populations. Six relatively distinct stages in the evolutionary history of Dicrostonyx from the Pechora (Dnieper) to Recent time have been described, but estimations of their relative ages are often debatable. The rates of change in the M1 and M2 morphotypes and morphological diversity in collared lemmings varied over the entire time interval. The fastest replacement of morphotypes and the highest level of morphological diversity in the study area occurred approximately during the Lateglacial (16–10 cal. ka BP). In the present study, we suggest a new version of evolutionary history of collared lemmings in northeast European Russia, taking into consideration the morphological variability of molars, radiocarbon dates and geological data. Our results provide a more detailed pattern of species evolution in the studied region and specific ages of some localities.

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Morphometric variation in the Nearctic collared lemming (Dicrostonyx)

Cited by 13 publications

References 26 publications

The Importance of Ice Ages in Diversification of Arctic Collared Lemmings (Dicrostonyx): Evidence from the Mitochondrial Cytochrome B Region

The Importance of Ice Ages in Diversification of Arctic Collared Lemmings (Dicrostonyx): Evidence from the Mitochondrial Cytochrome B Region

Genetic and morphometric variation in the Holarctic helminth parasite Andrya arctica (Cestoda, Anoplocephalidae) in relation to the divergence of its lemming hosts (Dicrostonyx spp.)

Evolution of occlusal shape of the first and second upper molars of Middle–Late Pleistocene collared lemmings (Dicrostonyx, Arvicolinae, Rodentia) in northeast European Russia

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