Search results for "Microtus"
showing 10 items of 59 documents
Nouvelles données sur la localité type et la morphométrie dentaire du campagnol de Gerbe Microtus pyrenaicus gerbei (Gerbe, 1879) (Cricetidae, Rodent…
2015
New data on type locality and dental morphometry of the Gerbe’s vole Microtus pyrenaicus gerbei (Gerbe, 1879) (Cricetidae, Rodentia). The synthesis of the historical research done on Arthur de L’Isle du Dréneuf’s life, the discoverer of the Gerbe’s vole Microtus pyrenaicus gerbei (Gerbe, 1879), and the circumstances connected with this discovery, allow to say that its type locality is the municipality of La Haie-Fouassière (Loire-Atlantique, France). The analysis of teeth found in pellets of barn owl from Pornic (Loire-Atlantique, France) has confirmed the odontometrical differentiation previously observed in M. pyrenaicus gerbei.
Odontometrical divergence in the Gerbe's vole Microtus (Terricola) pyrenaicus gerbei (GERBE, 1879) in comparison to the Pyrenean vole M. (Terricola) …
2010
This study confi rms the odontometrical divergence of the fi rst lower molar in the Gerbe’s vole Microtus (Terricola) pyrenaicus gerbei in comparison with the Pyrenean vole M. pyreneaicus pyrenaicus as well as the interest of genetic analyses to resolve its systematic position with regard to Microtus (Terricola) pyrenaicus.
A propos de l'observation de cas de campagnols des champs Microtus arvalis (Pallas, 1778) (Rodentia, Arvicolinae) caractérisés par une première molai…
2008
About some cases of common voles Microtus arvalis (Pallas, 1778) (Rodentia, Arvicolinae) characterised by a first lower molar with a pitymyan rhombus. This note describes and comments on some cases of common voles Microtus arvalis (Pallas, 1778) characterised by a first lower molar with a pitymyan rhombus.
Ecology of host-parasite relationships in boreal Europe : voles, food and infectious diseases
2014
Behavioural responses of voles to simulated risk of predation by a native and an alien mustelid: an odour manipulation experiment
2010
Context. Potential mammalian prey commonly use the odours of their co-evolved predators to manage their risks of predation. But when the risk comes from an unknown source of predation, odours might not be perceived as dangerous, and anti-predator responses may fail, except possibly if the alien predator is of the same archetype as a native predator. Aims. In the present study we examined anti-predator behavioural responses of voles from the outer archipelagos of the Baltic Sea, south-western Finland, where they have had no resident mammalian predators in recent history. Methods. We investigated responses of field voles (Microtus agrestis) to odours of native least weasels (Mustela nivalis)…
WEASELS’ (MUSTELA NIVALIS NIVALIS) PREFERENCE FOR OLFACTORY CUES OF THE VOLE (CLETHRIONOMYS GLAREOLUS)
2003
Many studies on life history strategies of small mammals under predation risk are based on assumptions that mammalian predators use scent marking from prey in searching and hunting. This is especially true for small mustelids hunting in the tunnels and cavities of their prey. It is assumed that weasels use the estrous signs of female voles as hunting cues, which exposes such females to a more pronounced risk of predation. We studied the preferences of 57 least weasels (Mustela nivalis nivalis) toward odor cues from four different reproductive categories of the bank vole (Clethrionomys glareolus). In the first experiment, weasels selected clearly for vole odors over clean bedding in a Y-maze…
UV reflecting vole scent marks attract a passerine, the great grey shrike Lanius excubitor
2002
Diurnal raptors have been shown to use ultraviolet vision and UV-reflecting vole scent marks to find suitable hunting areas. We studied if a passerine species, the great grey shrike Lanius excubitor that uses voles as its primary food, may also detect prey-patches in the same way. We conducted a laboratory experiment with ten shrikes. Each individual shrike had four options to choose from: (1) scent marks with UV light, (2) scent marks without UV light, (3) clean arena with UV light, and (4) clean arena without UV light. The birds preferred the scent-marked arena with UV light as measured by the number of scans and the time spent above it. Therefore, we suggest that great grey shrike probab…
Determining Behavioural Syndromes in Voles - The Effects of Social Environment
2010
Animal personality and behavioural syndromes have experienced rapid increase in interest in the last few years because of their possible role in the evolution of life histories. However, there is still a scarcity of studies concerning the mechanisms maintaining variation in behaviour as well as addressing their relationships to each other. In this paper, we tested the main assumptions of personality, focusing on the individual variability and repeatability of behaviour, and the identification of behavioural syndromes using the common vole (Microtus arvalis) as the species being studied. We also studied the effects of family group characters (group size, sex ratio and affinity to family) on …
WHO BEARS THE COSTS OF INTERSPECIFIC COMPETITION IN AN AGE-STRUCTURED POPULATION?
2003
Social and density-dependent life history processes may differ according to age and the reproductive history of individuals. Arvicoline rodents have a typical, season-dependent, bimodal, age distribution of breeding individuals within a population. This distribution may influence population fluctuations. In this study, we measured effects of interspecific competition from field voles (Microtus agrestis) on various fitness components of female bank voles (Clethrionomys glareolus) in an age-structured breeding population in large (0.25 ha) outdoor enclosures. We monitored survival, reproduction, and space use of experimental bank vole populations with females from two different age groups. Wi…
Food resources and intestinal parasites as limiting factors for boreal vole populations during winter
2014
Processes limiting the growth of cyclic vole populations have stimulated considerable research and debate over several decades. In Fennoscandia, the peak density of cyclic vole populations occurs in fall, and is followed by a severe winter decline. Food availability and intestinal parasites have been demonstrated to independently and synergistically limit wildlife populations. The purpose of this study was to directly compare competing food and parasite hypotheses on the limitation of overwintering high-density vole populations. Moreover, we evaluated the ability of food limitation and nematode infection to interact and thereby intensify population declines. A two-factor experiment with foo…