| 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 |
| growth and survival of suckling brown lemmings, lemmus trimucronatus. | | 1974 | 4443651 |
| preliminary evidence of periodontal disease in lemmus trimucronatus skulls from northern alaska. | | 1972 | 4504696 |
| 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 |
| natural or hormone-induced sexual and social behaviors in the female brown lemming (lemmus trimucronatus). | | 1982 | 6889568 |
| development of pelodera strongyloides (schneider, 1860) schneider, 1866 (nematoda: rhabditidae) in culture. | dauerlarvae of pelodera strongyloides, recovered from two species of lemmings, dicrostonyx groenlandicus (traill) and lemmus trimucronatus (richardson) trapped at eskimo point, n.w.t, were cultured on agar medium with e. coli. development from egg to adult stage was followed. eggs hatched between 22 and 26 hours at 22 degrees c. the first moult occurred 24 to 28 hours after the eggs hatched, the second at 40 to 48 hours, the third at 60 to 64 hours and the fourth at 84 to 88 hours at 22 degrees ... | 1980 | 7190984 |
| metabolic rate and thermal conductance of lemmings from high-arctic canada and siberia. | the arctic climate places high demands on the energy metabolism of its inhabitants. we measured resting (rmr) and basal metabolic rates (bmr), body temperatures, and dry and wet thermal conductances in summer morphs of the lemmings dicrostonyx groenlandicus and lemmus trimucronatus in arctic canada, and the bmr of d. torquatus, d. groenlandicus, l. sibiricus, l. bungei and l. trimucronatus in siberia. in contrast to previous studies the data were collected on animals that had spent only a limite ... | 2002 | 12122453 |
| 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 |
| significant morphological but little molecular differences between trypanosoma of rodents from alaska. | we examined blood smears of 173 rodents and 33 shrews captured at 4 sites in the gates of the arctic national park, northern alaska, in summer 2002. trypanosoma spp. were detected in the plasma of 5 microtus oeconomus, 4 microtus miurus, and 1 lemmus trimucronatus. the trypomastigote morphology from different individuals of m. oeconomus caught at the same site and of m. miurus from different sites varied significantly. the 4 dna sequences obtained from the blood smear positive samples contained ... | 2005 | 15856904 |
| 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 |
| 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 |
| benefiting from a migratory prey: spatio-temporal patterns in allochthonous subsidization of an arctic predator. | 1. flows of nutrients and energy across ecosystem boundaries have the potential to subsidize consumer populations and modify the dynamics of food webs, but how spatio-temporal variations in autochthonous and allochthonous resources affect consumers' subsidization remains largely unexplored. 2. we studied spatio-temporal patterns in the allochthonous subsidization of a predator living in a relatively simple ecosystem. we worked on bylot island (nunavut, canada), where arctic foxes (vulpes lagopus ... | 2012 | 22268371 |
| 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 |
| 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 |
| landscapes of fear or competition? predation did not alter habitat choice by arctic rodents. | in systems where predation plays a key role in the dynamics of prey populations, such as in arctic rodents, it is reasonable to assume that differential patterns of habitat use by prey species represent adaptive responses to spatial variation in predation. however, habitat selection by collared (dicrostonyx groenlandicus) and brown (lemmus trimucronatus) lemmings depends on intra- and inter-specific densities, and there has been little agreement on the respective influences of food abundance, pr ... | 2014 | 24100757 |
| 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 |
| 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 |
| 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 |