| [parasitic contacts between large gerbils (rhombomys opimus licht.) and yellow ground squirrels (citellus fulvus licht.) in prichuiskie muiunkumy]. | | 1972 | 4663127 |
| can the circadian system of a diurnal and a nocturnal rodent entrain to ultraviolet light? | spectral measurements of sunlight throughout the day show close correspondence between the timing of above ground activity of the european ground squirrel and the presence of ultraviolet light in the solar spectrum. however, in a standard entrainment experiment ground squirrels show no entrainment to ultraviolet light, while syrian hamsters do entrain under the same protocol. presented transmittance spectra for lenses, corneas, and vitreous bodies may explain the different results of the entrain ... | 2000 | 11016786 |
| [study of hybridization in four species of ground squirrels (spermophilus: rodentia, sciuridae) by molecular genetic methods]. | four species of ground squirrel--yellow (spermophilus fulvus), russet (s. major), small (s. pygmaeus), and spotted (s. suslicus)--occur in the volga region. between s. major and s. pigmaeus, s. major and s. fulvus, and s. major and s. suslicus, sporadic hybridization was reported. using sequencing and restriction analysis, we have examined the mtdna c region in 13 yellow, 60 russet, 61 small, 45 spotted ground squirrels, and 9 phenotypic hybrids between these species. it was shown that 43% of s. ... | 2002 | 12174588 |
| [a search for y-chromosomal species-specific markers and their use for hybridization analysis in ground squirrels]. | in four ground squirrel species from the volga region-yellow (spermophilus fulvus), russet (s. major), little (s. pygmaeus), and speckled (s. suslicus)--four hybridization variants (major/fulvus, major/pygmaeus, major/suslicus, and pygmaeus/suslicus) have been reliably described. earlier we have shown that populations of s. major from the volga region were characterized by wide introgression of mtdna from s. fulvus and s. pygmaeus, which probably, resulted from ancient hybridization. in this stu ... | 2006 | 16756073 |
| the potential to encode sex, age, and individual identity in the alarm calls of three species of marmotinae. | in addition to encoding referential information and information about the sender's motivation, mammalian alarm calls may encode information about other attributes of the sender, providing the potential for recognition among kin, mates, and neighbors. here, we examined 96 speckled ground squirrels (spermophilus suslicus), 100 yellow ground squirrels (spermophilus fulvus) and 85 yellow-bellied marmots (marmota flaviventris) to determine whether their alarm calls differed between species in their a ... | 2011 | 21221515 |
| a shortage of males causes female reproductive failure in yellow ground squirrels. | sexual conflict theory suggests that female breeding success is strongly influenced by individual life history and environmental conditions and is much less affected by mate availability. female mating failure due to a shortage of males remains poorly studied and understood. we present data on the effects of male availability on female breeding success in a wild colony of yellow ground squirrels (spermophilus fulvus). a female's probability of breeding increased with the local density of males a ... | 2015 | 26601284 |
| [biotope principles of sympatry and interspecies hybridization in mammals (by the example of the genus spermophilus)]. | two hybridization zones were taken as an example (the russet ground squirrel (spermophilus major) and the speckled ground squirrel (spermophilus suslicus), the russet ground squirrel and the yellow ground squirrel (s. fulvus) to show that biotope characteristics determine segregation of sympatric species in contact populations. the heterogeneity of biotopes with regard to the requirements of sympatric species promotes their long-term and steady dispersal and, in rare cases, sporadic hybridizatio ... | 2016 | 22567871 |
| [breeding success and direction of animal crossing in the hybrid russet (spermophilus major) and yellow (spermophilus fulvus) ground squirrel population]. | reproductive relations between animals in the hybrid settlement of the russet and yellow ground squirrels are panmictic and are characterized by the absence of assortative crossings and by the presence of multimale pairings in females with evidently heterospermic broods. maximum breeding success was observed for hybrid animals proving the fertility of hybrids. however, the hybrid breeding potential (young animal survival rate) is significantly lower as compared with russet and yellow ground squi ... | 2016 | 22117418 |
| stability of acoustic individuality in the alarm calls of wild yellow ground squirrels spermophilus fulvus and contrasting calls from trapped and free-ranging callers. | the questions of individuality and stability of cues to identity in vocal signals are of considerable importance from theoretical and conservation perspectives. while individuality in alarm calls has been reported for many sciurids, it is not well-documented that the vocal identity encoded in the alarm calls is stable between different encounters with predators. previous studies of two obligate hibernating rodents, speckled ground squirrels spermophilus suslicus, and yellow ground squirrels sper ... | 2010 | 20559613 |
| faunistic study of the rodents of north khorasan province, north east of iran, 2011-2013. | rodents are one of the most important hosts for some zoonotic diseases and also act as a reservoir of some ectoparasites and endoparasites. they cause damage to the farms and inflict public health. the aim of this study was to investigate the faunal composition of rodent in north khorasan province, northeast of iran. | 2018 | 30123806 |
| early predictors of female lifetime reproductive success in a solitary hibernator: evidence for "silver spoon" effect. | fitness consequences of early-life conditions remain unclear and poorly studied in mammals. based on long-term observations of yellow ground squirrels (spermophilus fulvus), we identified early determinants of female fitness by analyzing the effects of early-life individual and environmental characteristics (weaning weight, weight gain rate, date of natal emergence, natal litter size, location of the natal burrow, local density of juveniles, population density and precipitation in the post-weani ... | 2020 | 32318852 |