Discrimination de la morphologie dentaire de Lemmus lemmus et Myopus schisticolor (Arvicolidae, Rodentia) par l’analyse multivariée

Mammalia ◽  
1988 ◽  
Vol 52 (2) ◽  
Author(s):  
J. CHALINE ◽  
P. BRUNET-LECOMTE ◽  
A. KAIKUSALO ◽  
F. MARTIN ◽  
G. BROCHET
Keyword(s):  
Myopus Schisticolor ◽  
Lemmus Lemmus

Pneumocystis cariniiin arvicoline rodents: seasonal, interspecific, and geographic differences

1995 ◽  
Vol 73 (5) ◽  
pp. 961-966 ◽  
Author(s):  
J. Laakkonen ◽  
T. Soveri ◽  
H. Henttonen ◽  
J. Niemimaa
Keyword(s):  
Pneumocystis Carinii ◽  
Clethrionomys Glareolus ◽  
Microtus Agrestis ◽  
Northern Norway ◽  
Finnish Lapland ◽  
Low Protein ◽  
Geographic Differences ◽  
Myopus Schisticolor ◽  
Protein Diets ◽  
Lemmus Lemmus

We studied the seasonal prevalence of Pneumocystis carinii in Microtus agrestis (n = 289, two locations), Clethrionomys glareolus (n = 37), and Myopus schisticolor (n = 31) in southern and central Finland, in C. glareolus (n = 406) and Microtus oeconomus (n = 167) in Finnish Lapland, and in Lemmus lemmus (n = 35) in a fall sample in northern Norway. All material came from populations at peak and declining densities. The highest prevalence of P. carinii in M. agrestis in both locations in southern and central Finland was observed in November (30 and 10%). Two M. oeconomus were infected with P. carinii. No individual of the other species examined was positive for P. carinii. The prevalence and intensity of P. carinii infection in M. agrestis fed experimental low-protein diets were similar to those found in the field material.

Mortality of lemmings,Lemmus lemmus, at peak density in a mountainous area of Norway

1997 ◽  
Vol 243 (4) ◽  
pp. 831-835 ◽  
Author(s):  
H. Steen ◽  
J. C. Holst ◽  
T. Solhøy ◽  
M. Bjerga ◽  
E. Klaussen ◽  
...  
Keyword(s):  
Mountainous Area ◽  
Peak Density ◽  
Lemmus Lemmus

Evidence for pregnancy failure in young female Lemmus lemmus and Microtus oeconomus

1984 ◽  
Vol 62 (12) ◽  
pp. 2568-2570 ◽  
Author(s):  
Per Magne Jensen ◽  
Torgny O. Gustafsson
Keyword(s):  
Young Female ◽  
Microtus Oeconomus ◽  
Pregnancy Failure ◽  
Copulatory Plugs ◽  
Lemmus Lemmus

Pregnancy success in wild Norwegian lemming, Lemmus lemmus, and root voles, Microtus oeconomus, was monitored by recording the occurrence and condition of copulatory plugs, embryos, and mammae in ear-tagged females, which were recaptured several times throughout the summer of 1981 at Finse, Norway. Both populations increased and peaked in density during this period and evidence of pregnancy failure was found in several young, nulliparous females of both species. Similar observations have been reported in several other microtine species and the results are discussed in relation to (i) infertility of immature females, (ii) pregnancy block caused by unfamiliar males, and (iii) other stress related phenomena.

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