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Changes in the frontal sinuses of the weasel [Mustela nivalis] in Poland possibly caused by Nematodes or Trematodes.

100%
Schmidt K.
Wiadomości Parazytologiczne
|
1993
|
tom 39
|
nr 3
241-245
The presence of parasitic Nematodes was determined by visual assessment of damage to the 271 weasel skulls (154 males and 117 females). The damages were attributed to Skrjabingylus nasicola (LEUCKART, 1842) or Troglotrema acutum (LEUCKART, 1842) (on the basis of it's appearance and relevant papers). The frequency of infestation by both parasites was 38%. It was higher in females and also increased along with age. A significant dependence between skull length of adult specimens and infestation rate was found.
2

Skull variability of Mustela nivalis Linnaeus, 1766 in Poland

100%
Schmidt K.
Acta Theriologica
|
1992
|
tom 37
|
nr 1-2
The skull variability of Mustela nivalis Linnaeus, 1766 was studied with regard to age, sexual dimorphism and geographical distribution. The material consisted of 271 skulls from Poland. Linear dimensions of weasel skulls slightly increased with age. The changes in skull proportions were related to braincase diminution and increase in viscerocranium. In females, there was an obvious age variation in correlation structures which indicated synchronic growth and periods of stabilization. Sexual dimorphism was expressed by larger dimensions and different proportions in male skulls. The values of coefficients of variation were higher in males than females. Adult skull size was reached earlier by females than by male weasels. The correlation structures of male and female skulls were different. The skull dimensions increase from north-east to south-west Poland. It was revealed, that weasels from Poland but Silesia belong to the subspecies Mustela nivalis vulgaris Erxleben, 1777. Weasels from Silesia may probably form a separate subspecies Mustela nivalis trettaui Kleinschmidt, 1937.
3

Movement patterns of a specialist predator, the weasel Mustela nivalis exploiting asynchronous cyclic field vole Microtus agrestis populations

100%
Brandt M. J., Lambin X.
Acta Theriologica
|
2007
|
tom 52
|
nr 1
We investigated habitat selection and movement characteristics of male weaselsMustela nivalis Linnaeus, 1766 during the breeding season through radio-telemetry in Kielder Forest (KF) in order to assess how weasel movement is influenced by prey dynamics, mate searching and predation risk, and whether the scale of weasel movement corresponds to the spatial scale of the asynchronous, multi-annual vole population cycles observed in KF. Weasels used habitats with a high proportion of grass cover to a much larger extend than habitats with less grass cover and moved through the latter habitats faster and / or straighter. Habitats with high amounts of grass cover also had the highest field vole abundance, although total rodent abundance did not differ between habitats. The selection of this habitat by weasels might reflect weasels preferring field voles as prey or avoiding habitats with little grass cover and high intraguild predation risk. Five out of 8 male weasels radio-tracked had low day-to-day site fidelity and moved between different clear cuts. Three other males were resident in a single clear cut. This variation may reflect mate searching by male weasels. The observation that most weasels (5 out of 8) roamed over large areas and the scale of their dispersal potential suggests, that if they regulated vole populations, they should have a greater synchronising effect on the spatial scale of vole population dynamics than what is observed in vole populations in KF.
4

Hunting success of the weasel Mustela nivalis and escape tactics of forest rodents in Bialowieza National Park

100%
Jedrzejewski W., Jedrzejewska B., McNeish E.
Acta Theriologica
|
1992
|
tom 37
|
nr 3
Visual observations of five radiotracked male weasels Mustela nivalis Linnaeus, 1766 hunting rodents are reported. The weasels hunted bank voles Clethrionomys glareolus and yellow-necked mice Apodemus flavicollis in the primeval deciduous forests of the Białowieża National Park, Eastern Poland. Densities of rodents were high as a consequence of mast crop in the year preceding the observations. A total of 60 attacks by weasels were observed from October till December 1990. Weasels encountered voles and mice at a 1:1 ratio, similar to the ratio these rodents were captured in live traps (1:0.8). Only 23% of weasel attacks on voles, against 60% of those on mice, were successful. Out of 30 attacks on bank voles, 22 were on solitary voles and 8 on social groups of 2 - 4 voles. Bank voles were found by weasels in underground dens and on the ground. Out of 30 attacks on mice, 19 were on solitary individuals and 11 on groups of 2 - 6 mice. Mice were encountered by weasels in underground dens and in cavities located 1 - 4 m up old trees. It is suggested that the mechanism of greater susceptibility of mice to weasel predation in autumn and early winter lies in the physiology of mice, i.e. in their daily torpor. When hunting bank voles, the weasels were more successful with solitary voles than with social gToups. By contrast, attacks on groups of mice were more successful than those on solitary mice. In both species, the rodents in groups benefited from the 'dilution effect' in a group and had a higher probability of surviving weasel attacks than did solitary rodents. The antipredatory defence most frequently observed in both species of rodents was running out of a burrow or cavity when a weasel entered it. Mice often escaped by running away and climbing trees.
5

Prey selection of the least weasel Mustela nivalis in the laboratory

100%
Pekkarinen P., Heikkila J.
Acta Theriologica
|
1997
|
tom 42
|
nr 2
Prey individuals representing the bank vole Clethrionomys glareolus and the field vole Microtus agrestis were presented in pairs to male and female least weasels Mustela nivalis Linnaeus, 1766 in the laboratory. The voles were placed in two randomly selected boxes out of 8 boxes, which were connected to an arena housing the weasel. For each trial we recorded the finding, killing and eating order of the two prey individuals. Mate weasels tended to kill bank voles before field voles, and female weasels preferred to eat the bank vole first. Both sexes selected juvenile bank voles as the first prey to eat.
6

Weasel and stoat [Mustelidae; Mammalia] in the food of birds of prey from Poland

80%
Ruprecht A. L.
Acta Zoologica Cracoviensia
|
1997
|
tom 40
|
nr 2
7

Winter distribution and abundance of mustelids and beavers in the river valleys of Bialowieza Primeval Forest

80%
Sidorovich V. E., Jedrzejewska B., Jedrzejewski W.
Acta Theriologica
|
1996
|
tom 41
|
nr 2
Lutra lutra, Mustela vison, M. putorius, M. erminea, M. nivalis, and the settle­ments of Castor fiber were surveyed along 170 km of rivers in Białowieża Primeval Forest (Poland and Belarus), the best preserved temperate lowland forest in Europe. The censused rivers varied from very small (1-5 m wide, < 1 m deep) to medium-sized (11-15 m wide, up to 3 m deep). Mustelids were counted by tracks left in snow. Mean index of abundance of otters was 2.2 inds/10 km of the river bank (range 0-5) and that of mink 4.6 inds/10 km (range 0-7.5). On average, 1.4 polecats/10 km were recorded (range 0-5). Otters and mink were most abundant on the medium-sized rivers and least numerous on very small ones. Polecats lived predominantly on very small rivers. Species structure of a predator guild varied with river size. On average, 5.1 stoats and 4.0 weasels were counted per 10 km of river bank. Stoats were twice as common along rivers with open marshy flood-plain as along rivers with forested valleys. On average, 2.9 beaver settlements were recorded per 10 km of river bank (range 0-5). Habitat niche overlaps were highest between otter and mink, and stoat and mink. The smallest overlaps were between the polecat and all other predators. Densities of mustelid predators and beavers in Białowieża Primeval Forest were similar to those in other fairly well preserved woodlands in Europe,
8

Zwierzeta naszych lasow

70%
Szukiel E.
Echa Leśne
|
1992
|
tom 17
|
nr 02
16-17
9

Lasica

70%
Wasik S.
Przyroda Polska
|
2010
|
nr 02
20-21
10

Toads Bufo spp. in the diets of mustelid predators in Belarus

61%
Sidorovich V. E., Pikulik M. M.
Acta Theriologica
|
1997
|
tom 42
|
nr 1
Amphibians were important prey to the European mink Mustela lutreola, the American mink M. vison, polecat M. putorius, river otter Lutra lutra, and badger Meles meles, and formed a minor component of the food taken by stoat Mustela erminea, weasel M. nivalis, and pine marten Martes martes. Mink and otter strongly selected for frogs Rana spp. and avoided toads Bufo spp. However, the common toad can be an important prey for semiaquatic mustelids under unfavourable feeding conditions. Toads (mainly Bufo bufo, and rarely B. viridis) also occurred in significant numbers in the diets of polecats and badgers, which seemed to prey on frogs and toads with no clear selection.
11

Zimowe ubarwienie ssakow

60%
Borowski Z.
Poznajmy Las
|
1998
|
nr 1
22-23
12

Lasica - maly, wielki drapiezca

60%
Borowski Z.
Poznajmy Las
|
1998
|
nr 6
21-22
13

Milych snow lasico

60%
Radziwon P.
Przyroda Polska
|
1999
|
nr 07
10
14

Lasica

50%
Graszka-Petrykowski D.
Las Polski
|
2003
|
nr 19
15
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