Wyniki wyszukiwania - Biblioteka Nauki

1

Some aspects of social behaviour in the vole Microtus brandti [Radde, 1861]

100%

Stubbe A. , Janke S.

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nr 3-4

2

Spatial dynamics in relation to density variations of rodents in a forest landscape

86%

Hansson L.

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nr 3-4

3

Behavioural development of conspecific odour preferences in Brandt's vole Microtus brandti

86%

Zhang L. , Fang J. , Sun R.

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nr 1

EN

The behavioural development of conspecific odour preferences in Brandt's vole Microtus brandti (Radde, 1861) was evaluated in laboratory tests. During the weaning period (15th-30th day after the birth), the preference of pups to individual odours of their parents, novel adult males and females were examined. Pups investigated odours of unfamiliar adults significantly more than those of their parents and they displayed significantly more jumping and upward visual investigating behaviours on the bedding soiled by unfamiliar adults than they did on the bedding of their parents. However, the frequency of crossing the parent's bedding was significantly higher than the frequency of crossing the bedding of alien adults. It is suggested that odour discrimination ability was associated with the age of pups. The Brandt's vole pups might keep themselves away from unfamiliar environments by keeping away from the novel conspecific odours.

4

Adrenocortical variability in the life history of bank voles

86%

Bujalska G. , Evsikov V. , Gerlinskaya L. , Grika L. , Grum L. , Moshkin M.

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nr 3-4

5

Variability of stress-reactivity in a natural population of water vole, Arvicola terrestris

72%

Moshkin M. , Gerlinskaya L. , Evsikov V.

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nr 3-4

6

Immunocytochemical localization of interleukin-1 [Il-1] in testicular macrophages and Leydig cells of the bank vole [ Clethrionomys glareolus, S.]

72%

Kmicikiewicz I. , Bilinska B.

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nr 2

7

Reactions of female bank voles Clethrionomys glareolus to male chemosignals

72%

Kruczek M.

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tom 39

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nr 3

EN

The behavioural reactions of 110 female bank voles Clethrionomys glareolus (Schreber, 1780) to male chemosignals were studied in a 10 min two-choice preference test. Females spent more time investigating odours from the anogenital region of intact males and these contacts were much more frequent than in the case of castrated male. Male urine and homogenate of the salivary glands, kidney and preputial glands were very attractive to females. The extract of the liver, testes and seminal vesicles and coagulating glands had no effect on female behaviour. These findings indicate that the male chemosignals which attract females have a multiple source.

8

Conditions controlling the colonization of an orange orchard by Microtus duodecimcostatus [Rodentia, Arvicolidae]

72%

Mira A. , Luz Mathias M.

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nr 3-4

9

Trypanosoma [Herpetosoma] sp. in the social vole [Microtus socialis] for first time in Ukraine

72%

Karbowiak G. , Wita I. , Czaplinska U. , Polishchuk I. K.

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nr 3

10

Community responses of voles to patchy habitats

72%

Batzli G. O.

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nr 3-4

11

Factorial analysis of population dynamics in rodents

58%

Zhigalski O. A.

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tom 18

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nr 1-2

12

Density-dependent variation in body mass of voles

58%

Johannesen E. , Andreassen H. P.

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nr 2

EN

We studied inter-annual, spatial and sexual variation in the body mass of bank volesMyodes glareolus Schreber, 1780 and grey-sided volesMyodes rufocanus Sundevall, 1846 using live trappings from two grids on the southand north-facing slopes of a mountain valley in Southern Norway. Variation in spring density of the four populations was consistent with cyclic dynamics (n=7,s-values >0.5). Individuals caught on the south-facing slope were larger than those caught on the north-facing slope. Reproductively mature bank vole males were smaller than females, whereas reproductively mature grey-sided vole males were larger than females. Body mass was related to density in both species. In bank voles, we found a direct positive density dependence caused by a higher rate of survival at higher densities resulting from individual allocation of resources from reproduction to survival and growth. In grey-sided voles, we found a negative delayed density dependence resulting from grazing on preferred plants that determined the resource available for individual vole growth the following year.

13

Habitat selection and home range size of field voles Microtus agrestis in Slowinski National Park, Poland

58%

Borowski Z.

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nr 3

EN

Habitat preference, home range size and intra-specific overlap were investigated in summer 1998 among field voles Microtus agrestis (Linnaeus, 1761) in Słowiński National Park (N Poland). Eight individuals (2 females, 6 males) were radio-tracked for one week in August. Field voles were shown to exhibit a marked preference for meadow and the ecotone between grassland and habitats with common reed, while avoiding alder forest and proper reedbeds. No significant differences between night and day in habitat-use of voles were noted. The results suggest that, at the end of the breeding season, it was food resources, rather than the risk of predation, played an important role in the voles' utilisation of space. The home ranges of males were larger and more diverse than those of females; their sizes being correlated with body mass, such that heavier males had larger home ranges. This further suggests that intra-sexual competition exists between males for females. The low number of females influenced their spatial behaviour, as females had completely exclusive home ranges. Four males (out of six) had overlapping home ranges with other males; three of the overlaps were of less than 20%. Attributes of promiscuity (such as a 3.5:1 operational sex ratio of males to females, intra-sexual competition between males and the territorial exclusivity of females) influenced the social system. However, the period of radio-tracking during this study was too short to define accurately the social system in the field vole population.