| estrogen and progesterone interactions influencing sexual and social behavior in the brown lemming, lemmus trimucronatus. | | 1979 | 478445 |
| perianal pouches of male brown lemmings, lemmus trimucronatus, and a technique for determining the reproductive status of live animals. | | 1977 | 881588 |
| the perineal gland of brown lemmings, lemmus trimucronatus. | | 1976 | 986231 |
| [the topography of gomori positive neurosecretory elements of the hypothalamus of the lemmings dicrostonyx torquatus and lemmus sibiricus]. | under study was the structure of the hypothalamo-hypophyseal neurosecretory system in two species of lemmings of the wrangel island: the collared lemming, (dicrostonyx torquatus) and the ob lemming (lemmus sibiricus). inspite of the similarity in the general organization of this system in all rodents, certain species features were found in the topography of neurosecretory elements in the animals studied. in the ob lemming there is a great similarity in the structures of the neurosecretory system ... | 1976 | 1275710 |
| postoncospheral development and cycle of taenia polyacantha leuckart, 1856 (cestoda: taeniidae). first part. | the postoncospheral development and cycle of taenia polyacantha leuckart, 1856, an holarctic species of cestode, were investigated in the laboratory as well as in the tundra of northern alaska. foxes, alopex lapogus (l.) and vulpes vulpes (l.), serve as final host of t. polyacantha; the northern vole, microtus oeconomus (pallas), and the brown lemming, lemmus sibiricus (kerr), are important as the intermediate host. as determined in experimentally infected voles and lemmings, the oncosphere of t ... | 1988 | 3059953 |
| growth and survival of suckling brown lemmings, lemmus trimucronatus. | | 1974 | 4443651 |
| effects of olfactory cues on sexual behavior in the brown lemming, lemmus trimucronatus. | three groups of female lemmings were tested to determine the effects of odor familiarity on measures of reproductive behavior. a familiar odor (fo) group was exposed to the bedding of a particular male for 1 wk, then tested with that male. a second female group (unfamiliar odor; uo) was exposed to the bedding of a male for 1 wk, then tested with a different male. a third group (control; co) was not exposed to male bedding prior to being tested with a male. the fo females engaged in higher freque ... | 1983 | 6347506 |
| social olfaction in male brown lemmings (lemmus sibiricus = trimucronatus) and collared lemmings (dicrostonyx groenlandicus): i. discrimination of species, sex, and estrous condition. | when tested in a y-maze olfactometer, sexually experienced and sexually naive brown and collared lemmings (lemmus sibiricus = trimucronatus and dicrostonyx groenlandicus) preferred the odor of conspecific females to the odor of females of another species. both experienced and naive males also preferred the odor of conspecific females to that of conspecific males. only sexually experienced males showed a significant preference for estrous over nonestrous conspecific females. sexually experienced ... | 1984 | 6368118 |
| natural or hormone-induced sexual and social behaviors in the female brown lemming (lemmus trimucronatus). | | 1982 | 6889568 |
| experimental infections by brucella suis type 4 in alaskan rodents. | the susceptibility of nine species of rodents and one species of lagomorph to brucella suis type 4 was studied experimentally. the rodent species included: guinea pig (cavia porcellus), scandinavian lemming (lemmus lemmus), brown lemming (l. sibiricus), northern red-backed vole (clethrionomys rutilis), varying lemmings (dicrostonyx stevensoni and d. rubricatus), yellow-cheeked vole (microtus xanthognathus), flying squirrel (glaucomys sabrinus) and ground squirrel (citellus parryii). the lagomorp ... | 1980 | 7463596 |
| isolation and characterization of a hantavirus from lemmus sibiricus: evidence for host switch during hantavirus evolution. | a novel hantavirus, first detected in siberian lemmings (lemmus sibiricus) collected near the topografov river in the taymyr peninsula, siberia (a. plyusnin et al., lancet 347:1835-1836, 1996), was isolated in vero e6 cells and in laboratory-bred norwegian lemmings (lemmus lemmus). the virus, named topografov virus (top), was most closely related to khabarovsk virus (kbr) and puumala viruses (puu). in a cross focus reduction neutralization test, anti-top lemmus antisera showed titers at least fo ... | 1999 | 10364307 |
| glacial survival of the norwegian lemming (lemmus lemmus) in scandinavia: inference from mitochondrial dna variation. | in order to evaluate the biogeographical hypothesis that the norwegian lemming (lemmus lemmus) survived the last glacial period in some scandinavian refugia, we examined variation in the nucleotide sequence of the mitochondrial control region (402 base pairs (bp)) and the cytochrome b (cyt b) region (633 bp) in norwegian and siberian (lemmus sibiricus) lemmings. the phylogenetic distinction and cyt b divergence estimate of 1.8% between the norwegian and siberian lemmings suggest that their separ ... | 2001 | 11345325 |
| rodent host specificity of european hantaviruses: evidence of puumala virus interspecific spillover. | in order to investigate rodent host specificity of european hantaviruses, experimental infection of colonized and wild-trapped rodents was performed. in addition to the natural rodent reservoir, clethrionomys glareolus, puumala hantavirus (puuv) could infect colonized microtus agrestis and lemmus sibiricus, but not syrian hamsters or balb/c mice. neither c. glareolus, nor m. agrestis, could be readily infected by tula hantavirus (tulv). wild-trapped apodemus flavicollis and a. agrarius, the natu ... | 2002 | 12376967 |
| new distribution records of echinococcus multilocularis in the brown lemming from barrow, alaska, usa. | we identified echinococcus multilocularis for the first time in brown lemmings (lemmus trimucronatus) from barrow, alaska, usa. of 467 brown lemmings trapped between 1995 and 2000, two males and two females (0.9%; 95% confidence interval=0.9+/-0.9%) were found to be infected with metacestodes of e. multilocularis. no metacestodes were found in 17 collared lemmings (dicrostonyx rubricatus) also trapped at barrow. in humans, e. multilocularis causes alveolar echinococcosis, which is potentially fa ... | 2005 | 15827234 |
| seasonal glucocorticoid responses to capture in wild free-living mammals. | we determined baseline and capture-induced glucocorticoid concentrations during two different seasons in three species of wild free-living rodents: brown lemmings (lemmus trimucronatus), golden-mantled ground squirrels (spermophilus saturatus), and yellow-pine chipmunks (tamias amoenus). initial blood samples were obtained within 3 min of capture, so that initial glucocorticoid levels reflect baseline titers of undisturbed animals. animals were held for an additional 30 min, when a second blood ... | 2008 | 18094060 |
| isolation and genetic characterization of hantaviruses carried by microtus voles in china. | to gain more insights into hantavirus distribution in china, microtus fortis were caught in jilin province and m. maximowiczii in the inner mongolia autonomous region. hantavirus specific rna was detected by rt-pcr in 3 out of 26 m. fortis and 5 out of 64 m. maximowiczii. two hantaviruses (fusong-mf-682 and yakeshi-mm-59) were isolated successfully in cell culture and their s and m segment nucleotide sequences were determined. phylogenetic analysis of the s and m segment sequences revealed that ... | 2008 | 18297708 |
| habitat selection, reproduction and predation of wintering lemmings in the arctic. | snow cover has dramatic effects on the structure and functioning of arctic ecosystems in winter. in the tundra, the subnivean space is the primary habitat of wintering small mammals and may be critical for their survival and reproduction. we have investigated the effects of snow cover and habitat features on the distributions of collared lemming (dicrostonyx groenlandicus) and brown lemming (lemmus trimucronatus) winter nests, as well as on their probabilities of reproduction and predation by st ... | 2011 | 21701915 |
| a redescription of arostrilepis beringiensis (kontrimavichus et smirnova, 1991) and descriptions of two new species from palaearctic microtine rodents, arostrilepis intermedia sp. n. and a. janickii sp. n. (cestoda: hymenolepididae). | arostrilepis beringiensis (kontrimavichus et smirnova, 1991) is redescribed on the basis of its type specimens from lemmus trimucronatus (richardson) and material from the collections of the institute of systematics and ecology of animals, novosibirsk from the lemmings myopus schisticolor (lilljeborg) and lemmus sibiricus (kerr) from the asian part of russia. specimens previously identified as arostrilepis horrida (linstow, 1901) from voles are revised and newly collected materials are addressed ... | 2011 | 22263310 |
| a new intermediate host for echinococcus multilocularis: the southern red-backed vole (myodes gapperi) in urban landscape in calgary, canada. | human alveolar echinococcosis (hae) is a potentially fatal parasitic disease caused by echinococcus multilocularis, a cestode characterized by a sylvatic life-cycle involving several species of rodents and lagomorphs as intermediate hosts and canids as definitive hosts. despite the wide distribution of the parasite in north america, the number of competent intermediate host species identified to date is still relatively small, and mainly includes the northern vole (microtus oeconomus), brown lem ... | 2013 | 23608104 |
| [the population aspects of thyroid development in the siberian (lemmus sibiricus) and arctic (dicrostonyx torquatus) lemmings of wrangel island]. | rate of thyroid gland development differ significantly on the stages of growth, highest value and recession of quantity in lemmus sibiricus fetuses. rate of embryogenic thyroid gland development in the highest value of population quantity reduces compared to that observed during the quantity growth. however, this reduction is displayed in smaller extent than in embryos of dicrostonyx torquatus of the same population cycle stage. in newborns organ achieves definitive structure in highest value, w ... | 1996 | 8768570 |
| [seasonal changes in the energy metabolism of subarctic rodents]. | in widespread species, northern taiga voles, most significant differences in the intensity of energy metabolism (m), maximum (mmax) and reserve (mres) metabolism were observed at winter temperatures (-5-20 degrees c): clethrionomys rutilus greater than c. rufocanus greater than microtus oeconomus; differences in seasonal increase of mmax and mres exhibit an inverse proportion. seasonal changes in m and mmax in autochthonous tundra rodents indicate that lemmus sibiricus belongs to a more eurybion ... | 2006 | 2596207 |
| social olfaction in male brown lemmings (lemmus sibiricus = trimucronatus) and collared lemmings (dicrostonyx groenlandicus): ii. discrimination of mated and unmated females. | when tested in a y-maze olfactometer, male brown and collared lemmings (lemmus sibiricus = trimucronatus and dicrostonyx groenlandicus) preferred the odor of unmated receptive females to the odor of females with which they had just copulated. similarly, sexually satiated males preferred the odor of an unmated receptive female to that of a strange female that had recently copulated with another male. sexually experienced males without recent copulatory experience also demonstrated this preference ... | 1984 | 6368119 |
| highly overlapping winter diet in two sympatric lemming species revealed by dna metabarcoding. | sympatric species are expected to minimize competition by partitioning resources, especially when these are limited. herbivores inhabiting the high arctic in winter are a prime example of a situation where food availability is anticipated to be low, and thus reduced diet overlap is expected. we present here the first assessment of diet overlap of high arctic lemmings during winter based on dna metabarcoding of feces. in contrast to previous analyses based on microhistology, we found that the die ... | 2015 | 25635852 |
| predation pressure by avian predators suggests summer limitation of small-mammal populations in the canadian arctic. | predation has been suggested to be especially important in simple food webs and less productive ecosystems such as the arctic tundra, but very few data are available to evaluate this hypothesis. we examined the hypothesis that avian predators could drive the population dynamics of two cyclic lemming species in the canadian arctic. a dense and diverse suite of predatory birds, including the snowy owl (bubo scandiacus), the rough-legged hawk (buteo lagopus), and the long-tailed jaeger (stercorariu ... | 2014 | 24649646 |
| myocoptid mites (acariformes: myocoptidae) of the fauna of the former ussr. | mites of the family myocoptidae (acariformes: sarcoptoidea) of the former ussr are revised based on the collection of the zoological institute ras (st. petersburg, russia). seventeen described species are recorded. four species are described as new for science: trichoecius dubininae sp. nov. from lasiopodomys gregalis (pallas) (rodentia: cricetidae) from russia (chelyabinsk prov., type locality), kazakhstan and kirghizia, t. lemmus sp. nov. from lemmus sibiricus (kerr) (rodentia: cricetidae) fro ... | 2016 | 27988689 |
| assessing stress in arctic lemmings: fecal metabolite levels reflect plasma free corticosterone levels. | interest in the ecology of stress in wild populations has triggered the development of noninvasive methods for quantifying stress hormones. measurement of fecal corticosteroid metabolites (fcms) is one such method, but it is still unclear whether fcms can be a reliable proxy of free plasma glucocorticoids. to assess the validity of this assumption, we carried out a robust assessment on brown lemmings (lemmus trimucronatus) from bylot island, nunavut, canada, that were hand captured and anestheti ... | 2017 | 28384423 |
| the effect of snow cover on lemming population cycles in the canadian high arctic. | rising temperatures and changes in the precipitation regime will have a strong impact on the quality of the snow cover in the arctic. a snow cover of good quality protecting lemmings from cold temperatures and predators is thought to be an important factor for maintaining the cyclic dynamic of their populations in the tundra. we examined if the characteristics of annual fluctuations (amplitude and shape of phases) in brown lemming (lemmus trimucronatus) density could be determined by snow depth, ... | 2013 | 23232938 |
| disentangling trophic relationships in a high arctic tundra ecosystem through food web modeling. | determining the manner in which food webs will respond to environmental changes is difficult because the relative importance of top-down vs. bottom-up forces in controlling ecosystems is still debated. this is especially true in the arctic tundra where, despite relatively simple food webs, it is still unclear which forces dominate in this ecosystem. our primary goal was to assess the extent to which a tundra food web was dominated by plant-herbivore or predator-prey interactions. based on a 17-y ... | 2012 | 22919916 |
| genetic structure of siberian lemmings (lemmus sibiricus) in a continuous habitat: large patches rather than isolation by distance. | in a continuous habitat, restricted dispersal and local genetic drift are likely to create a pattern of increasing genetic differentiation with distance. here, we describe the genetic structure of siberian lemming (lemmus sibiricus) populations in a continuous tundra habitat on the western coast of the taimyr peninsula, in order to determine the spatial scale at which genetic differentiation and isolation by distance occur. sampling was carried out at three different geographical scales: (1) a c ... | 2001 | 11595052 |
| reproductive behaviour of female siberian lemmings during the increase and peak phase of the lemming cycle. | the reproduction of female siberian lemmings in the increase and peak phases of the lemming cycle was investigated in connection with a ship-borne expedition along the siberian arctic tundra. the cycle phase of each studied lemming population was determined using demographic analyses, i.e. current density indices (captured lemmings per 100 traps per 24 h), information on previous density (frequency of old lemming faeces and runways), and information from dendrochronological analyses revealing th ... | 2000 | 28308724 |
| asynchronous population dynamics of siberian lemmings across the palaearctic tundra. | the synchrony of siberian lemming (lemmus sibiricus l.) population dynamics was investigated during a ship-borne expedition along the palaearctic tundra coast in the summer of 1994. on 12 sites along the coast from the kola peninsula to wrangel island, relative densities of lemmings were recorded using a standardised snap-trapping programme. the phase position of the lemming cycle in each of the studied populations was determined based on current density estimates, signs of previous density and ... | 1999 | 28307707 |
| effects of pre- and postpubertal social experience on sexual and social behavior in male and female brown lemmings (lemmus sibiricus). | the effects of prepubertal social contact and postpubertal mating experience on sexual behavior were examined in male and female brown lemmings (lemmus sibiricus). subjects of both sexes were either isolated at weaning (18 days) or then housed with siblings for another 10 days before being isolated. before testing for sexual behavior at the age of 75 days, half of each group of males received a series of exposures to estrous females and half of each group of females was housed with a stud male. ... | 1986 | 3542362 |
| nest insulation: energy savings to brown lemmings using a winter nest. | energy metabolism of brown lemmings in summer pelage was measured over long periods at several air temperatures, with and without a real nest or artificial nest material. resting metabolism of lemmings at t a=-16°c was 43% higher than that of lemmings in nests. as t a increased, the difference between resting metabolism of animals with and without nests decreased and was similar at t a=20°c. the energy saved at rest is equivalent to a reduction of approximately 40% in the thermal conductance. in ... | 1981 | 28311088 |
| the brown lemming, lemmus sibiricus (rodentia, arvicolidae), in the late pleistocene of alberta and its postglacial dispersal. | | 1980 | 7000329 |
| gastric candidiasis in laboratory-reared brown lemmings. | | 1979 | 521390 |
| postnatal changes in body composition of laboratory maintained brown lemmings, lemmus sibiricus. | postnatal changes in the body composition components, namely, body water, fat-free dry solids, and fat, were determined for laboratory-maintained brown lemmings, lemmus sibiricus. the proportion of body water decreased while the proportion of fat-free dry solids and fat increased from birth to approximately 15 weeks of age. from 20 through 80 weeks of age, the proportions of all body composition components as well as total body weight remained relatively constant. body composition components wer ... | 1978 | 723215 |
| comparative solubilities and electrophoresis of microtine hemoglobins. | 1. the electrophoretic mobilities of the hemoglobins of 7 taxa of microtines were compared. microtus oeconomus, m. pennsylvanicus pullatus and m. xanthognatus showed identical 2-band patterns on electrophoresis of their hemoglobins while m. pennsylvanicus tananaensis showed only a single hemoglobin corresponding to the major band of the others. dicrostonyx rubricatus and d. stevensoni exhibited identical patterns different from the microtus species. lemmus sibiricus had a slow hemoglobin compone ... | 1977 | 400948 |
| further obervations on the adrenal secretory rhythm of the brown lemming. | | 1968 | 5755722 |
| comparative phylogeography highlights the double-edged sword of climate change faced by arctic- and alpine-adapted mammals. | recent studies suggest that alpine and arctic organisms may have distinctly different phylogeographic histories from temperate or tropical taxa, with recent range contraction into interglacial refugia as opposed to post-glacial expansion out of refugia. we use a combination of phylogeographic inference, demographic reconstructions, and hierarchical approximate bayesian computation to test for phylodemographic concordance among five species of alpine-adapted small mammals in eastern beringia. the ... | 2015 | 25734275 |
| top-down limitation of lemmings revealed by experimental reduction of predators. | it is generally recognized that delayed density-dependence is responsible for cyclic population dynamics. however, it is still uncertain whether a single factor can explain why some rodent populations fluctuate according to a 3-4 yr periodicity. there is increasing evidence that predation may play a role in lemming population cycles, although this effect may vary seasonally. to address this issue, we conducted an experiment where we built a large exclosure (9 ha) to protect brown lemmings (lemmu ... | 2016 | 27870031 |
| seasonal demography of a cyclic lemming population in the canadian arctic. | 1. the causes of cyclical fluctuations in animal populations remain a controversial topic in ecology. food limitation and predation are two leading hypotheses to explain small mammal population dynamics in northern environments. we documented the seasonal timing of the decline phases and demographic parameters (survival and reproduction) associated with population changes in lemmings, allowing us to evaluate some predictions from these two hypotheses. 2. we studied the demography of brown lemmin ... | 2015 | 25939755 |
| high arctic lemmings remain reproductively active under predator-induced elevated stress. | non-consumptive effects of predation have rarely been assessed in wildlife populations even though their impact could be as important as lethal effects. reproduction of individuals is one of the most important demographic parameters that could be affected by predator-induced stress, which in turn can have important consequences on population dynamics. we studied non-consumptive effects of predation on the reproductive activity (i.e., mating and fertilization) of a cyclic population of brown lemm ... | 2018 | 29651661 |
| resource partitioning among avian predators of the arctic tundra. | interspecific competition can play a key role in structuring ecological communities. the arctic tundra is a low productivity ecosystem supporting simple food webs, but several predators often feed on the same prey species, lemmings, known for their large-amplitude population fluctuations. we examined mechanisms involved in reducing intra-guild competition and allowing coexistence of four avian predators (snowy owls, glaucous gulls, rough-legged hawks and long-tailed jaegers) feeding on a pulsed ... | 2020 | 32965060 |
| the structure and function of the cheek pads of the brown lemming, lemmus sibiricus (trimucronatus) (kerr). | | 1965 | 5827478 |
| a finding of a frozen mummy of a lemming (rodentia, cricetidae, lemmus) in the upper pleistocene of yakutia. | the external morphological, x-ray, and tomographic study of a frozen rodent mummy from the upper pleistocene yedoma deposits on the tirekhtyakh river (a semyuelyakh river tributary, abyi ulus, republic of sakha (yakutia), russia) showed its belonging to lemmus sp. the radiocarbon age of the finding is 41 305-41 885 cal b.p. this is the first pleistocene discovery of a frozen mummy of a genus lemmus representative. in terms of the body and skull sizes, coat color, the lower incisor length, and th ... | 2019 | 32130584 |