Wyniki wyszukiwania

1

Size and overlap of home range in a high density population of the Japanese field vole Microtus montebelli

100%

Urayama K.

Acta Theriologica

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1995

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tom 40

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nr 3

Relationships of size and overlap of home range with the population density in a flood plain population of Microtus montebelli (Milne-Edwards, 1872) with high density were examined from April to December 1993 using mark-recapture method. Population density in the study area was reached 280 males/ha and 236 females/ha in summer. Although reproductively active voles were present throughout this study, more than half of females underwent reproductively resting period in summer. Main breeding seasons were spring and autumn when the density was relatively low. While the home range size of adult males did not decrease in summer when the population density was higher than other seasons, that of adult females was significantly smaller in summer than in spring or autumn. In summer, males showed significantly larger degree of home range overlap than in spring or autumn, while home ranges of females overlapped little throughout this study. These results differed from those of the previous studies on this species, possibly due to much higher density in mountainous populations.

2

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

100%

Stubbe A., Janke S.

Polish Ecological Studies

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1994

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tom 20

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nr 3-4

3

A spatially explicit approach to vole population processes

100%

Lidicker W. Z.

Polish Ecological Studies

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1994

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tom 20

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nr 3-4

4

Renewal of burrows by the common vole as the indicator of its numbers

86%

Liro A.

Acta Theriologica

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1974

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tom 19

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nr 14-25

5

Space use and juvenile recruitment in gray-tailed voles in response to intruder pressure and food abundance

86%

Wolff J. O., Schauber E. M.

Acta Theriologica

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1996

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tom 41

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nr 1

We examined space use by female gray-tailed voies Microtus canicaudus (Miller, 1897) and recruitment of juveniles in response to relative abundance of food and increased intruder pressure following experimental removal of habitat. Our experiment indirectly tested the assumptions of the food-defense and pup-defense hypotheses for female territoriality. Following a 70% reduction in habitat, territories of females shrunk from -50 m to < 20 m with no significant difference in pregnancy rates or overall juvenile recruitment compared to controls. Juvenile recruitment was not adversely affected by overall density or the numbers of males sharing a patch, but decreased significantly as the number of unrelated adult females sharing a patch increased. We did not measure infanticide directly, but the decreased rate of juvenile recruitment in the presence of adult females but not males suggests that pup mortality rather than food limitation contributed to reduced juvenile recruitment, We conclude that at high densities, increased intruder pressure from adult females had a greater impact on juvenile recruitment than did food abundance. Thus, our results suggest that patterns of space use, reproductive rates, and juvenile recruitment were more consistent with the pup-defense than the food-defense hypothesis for female territoriality.

6

The effect of Il-1 on basal and hCG-stimulated testosterone secretion by Leydig cells of the bank voles [ Clethrionomys glareolus, S.]

86%

Kmicikiewicz I., Bilinska B.

Folia Histochemica et Cytobiologica

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1997

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tom 35

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nr 2

7

Behavioural variation in two populations of root voles

86%

Kapusta J., Pachinger K., Marchlewska-Koj A.

Acta Theriologica

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1999

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tom 44

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nr 4

Significant morphological and physiological variations between root vole Microtus oeconomus (Pallas, 1776) populations have been found. Behavioural differences between two geographically separated populations were found in this study. Ultrasonic vocalization and behavioural interaction (non-aggressive and aggressive approaches) were monitored during 10-min encounters. Ultrasounds were monitored during encounters involving all possible combinations of males and females of two populations, called here southern (Prague, Czech Republic) and northern (Białowieża, Poland). The northern male-male combination did not produce ultrasounds. In both populations, males exhibited more aggressive behaviour than females did. Since M. oeconomus females are highly territorial and the home ranges of males overlap, the agonistic behaviour of males may enable them to control a larger area with greater numbers of receptive females. We also found significant differences in behavioural activity between the two investigated populations: southern M. oeconomus showed higher activity than northern root voles did. Separate populations which differ morphologically and behaviourally have much to tell us about speciation processes. Behavioural divergence can lead to reproductive isolation and thus create separate gene pools.

8

Airborne and substrate-borne communications of Microtus [Terricola] gerbei and M. [T.] duodecimcostatus

86%

Giannoni S. M., Marquez R., Borghi C. E.

Acta Theriologica

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1997

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tom 42

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nr 2

The repertoire of airborne and substrate-borne communications is described for two species of mote-voles: Microtus (Terrícola) gerbei {de Séiys-Longchamps, 1847) and M. (T.) duodecimcostatus (de Sélys-Longchamps, 1839). The behavioural significance of the different types of sounds emitted was analysed from observations of intraspecific interactions in captive environments. Substrate-borne signals were used more often by dominant individuals, and were predominantly recorded in the more aggressive species, M. duodecimcostatus. The use of substrate-borne signals is much more prevalent in the more aggressive M. duodecimcostatus, while the less aggressive M. gerbei has a larger acoustical repertoire.

9

Adrenocortical variability in the life history of bank voles

86%

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

Polish Ecological Studies

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1994

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tom 20

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nr 3-4

10

Homing and space activity in bank voles Clethrionomys glareolus

86%

Andrzejewski R., Babinska-Werka J., Liro A., Owadowska E., Szacki J.

Acta Theriologica

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2000

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tom 45

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nr 2

Spatial activity and homing of bank voles Clethrionomys glareolus (Schreber, 1V801 have been studied in the 100 years old alder wood (Carici elongatae-Alnelum Koch, 1926) in the Kampinos National Park near Warsaw. Six parallel trap lines of 600 m each were set. Each of external lines consisted of 100 live-traps. Between the two lines, <1 lines of 200 snap-traps in each were set at 100 m intervals. Individuals caught m live-traps were individually marked and released in the centre of the study area. During the study 613 bank voles were marked and 424 recaptures were recorded. Considerable mobility of animals was found (a high proportion of animals moved more than 600 m). Distribution of animals retrapped made it possible to determine hypothetical spatial patterns of homing. It is suggested that familiarity with the given area acquired during long distance movements help small mammals to find their way when homing regard" less of the nature of homing. Catholic University of Lublin, Al. Racławickie 14, 20-950 Lublin, Poland (RA); Department of Game Management, Agriculture University of Warsaw, Rakowiecka 26/30, 02-528 Warsaw, Poland (JB-W); Kampinos National Forest, Tetmajera 38, 05-080 Izabelin, Poland (EO); National Foundation for Environment Protection, Krzywickiego 9, 0U-078 Warsaw, Poland (AL, JS)

11

Influence of operational sex ratio and density on the copulatory behaviour and mating system of Brandt's vole Microtus brandti

86%

Zhang J., Zhang Z.

Acta Theriologica

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2003

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tom 48

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nr 3

The pattern of copulatory behaviour of Brandt's vole Microtus brandti (Radde, 1861) is similar to patterns 11 and 12 as described by Dewsbury and Dixson: no lock, single intromission, thrusting after intromission and multiple ejaculations. Under constant density, when the operational sex ratio (OSR, male to female) was skewed to the males, the mating opportunity of males decreased due to mating interference, while the mating input of female remained the same; when the OSR was skewed to the females, male voles tended to increase mating input while females did not. Under the same OSR (1:1), when density increased, the mating opportunity of both sexes dramatically decreased due to mating interference between same sex individuals; the thrusting frequency of males increased, probably due to compensation for the decreased mating opportunity. There was a considerable probability of the voles forming monogamous and polygynous mating relationships. Our results did not support the prediction that when OSR is skewed to male, the mating interval of males will shorten. We suggest that the most predominant mating system and mating interference should be taken into account when investigating an OSR effect. Our study suggested that the Brandt's vole is prone predominantly to monogamy and polygyny. However, due to limitation of observation in the laboratory, further work should be combined with studies in the field.

12

Immunolocalization of aromatase and estrogen receptors in bank vole Leydig cells

86%

Schmalz B., Koziel E., Bilinska B.

Folia Histochemica et Cytobiologica

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1999

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tom 37

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nr 2

13

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

86%

Hansson L.

Polish Ecological Studies

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1994

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tom 20

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nr 3-4

14

Intersexual attraction in natal dispersing root voles Microtus oeconomus

86%

Gundersen G., Moe J. A., Andreassen H. P., Carlsen R. G., Gundersen H.

Acta Theriologica

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1999

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tom 44

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nr 3

By an enclosure experiment we tested whether natal dispersing root voles Microtus oeconomus (Pallas, 1776) were prevented from colonising already occupied habitat patches or if they were attracted to habitat patches by potential mates. The treatment consisted of manipulating the presence of animals in immigration patches, either with the presence of a solitary sexually mature male or female, whereas empty patches were used as a control. Immigration patches were separated from a patch used for release of a matriline (mother with her newly weaned titter) by a semipermeable fence allowing only interpatch movements of young animals. We predicted that either a social fence would prevent immigration to treatment patches, or that potential mates would attract dispersing individuals. In particular we expected fewer dispersing males to colonise male occupied patches, and fewer dispersing females to colonise female occupied patches due to intrasexual competition, ie an intrasexual social fence. We found that a higher proportion of females settled in male treatment patches than in female patches, whereas male dispersal was unaffected by treatment. Thus, the observed female immigration pattern appeared to be an attraction to patches occupied by the opposite sex We found no sign that immigration was prevented by a social fence.

15

Spatial structure of Microtus rossiaemeridionalis during population growth

86%

Muntyanu A., Sitnik V.

Polish Ecological Studies

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1994

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tom 20

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nr 3-4

16

Spatial organization in a small population of the root vole Microtus oeconomus in a linear habitat

86%

Fauske J., Andreassen H. P., Ims R. A.

Acta Theriologica

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1997

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tom 42

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nr 1

We studied demography and spatial organization in a population of root voles Microtus oeconomus (Pallas, 1776) inhabiting a fenced, linear habitat (560 x 1.5 m) during the breeding season, using live trapping and radiotelemetry. There were no establishments of new reproductive individuals. Compared to root voles in non-linear habitats, home ranges were extremely small and no male home ranges overlapped. A short term removal and reintroduction experiment (2 days removal of every second individual on the study area) produced no changes in home range size, indicating that home range borders were not defended by daily contact between neighbours.

17

Preliminary observations of the cytological structure of the hypothalamo-neurohypophyseal magnocellular neuroendocrine system in field voles after acute thermal stress

86%

Sawicki B., Borowska H., Arciszewska E.

Folia Histochemica et Cytobiologica

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1999

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tom 37

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nr 2

18

Abundance and seasonal dynamics of bank voles in a patchy agricultural landscape

86%

Kozakiewicz M., Gortat T.

Polish Ecological Studies

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1994

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tom 20

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nr 3-4

19

Validation of two new total body electrical conductivity (TOBEC) instruments for estimating body composition of live northern red-backed voles Clethrionomys rutilus

86%

Zuercher G. L., Roby D. D., Rexstad E. A.

Acta Theriologica

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1997

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tom 42

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nr 4

Total body electrical conductivity (TOBEC) is a method for non-destructively estimating body composition. We sought to monitor seasonal changes in total body fat in northern red-backed voles Clethrionomys rutilus (Pallas, 1779), a microtine (10-45 g). We validated two new TOBEC instruments: the SA-3000 by EM-SCAN Inc. and the ACAN-2 by Jagmar Inc. Both instruments explained 94% of the variation in lean body mass and total body water. However, accuracy of fat estimates generated from lean mass predictions was poor for both instruments (± > 100%). Two instrument-specific multiple regression models and a TOBEC-free multiple regression model were used to estimate total body fat. All three improved the ability to predict total body fat in C, rutilus. These two TOBEC instruments can not be used to measure changes in total body fat of individual C. rutilus due to the small amount of fat reserves and lack of seasonal variation.

20

Spacing behaviour of breeding female bank voles

86%

Rozenfeld F.

Polish Ecological Studies

|

1994

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tom 20

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nr 3-4

Ograniczanie wyników

Size and overlap of home range in a high density population of the Japanese field vole Microtus montebelli

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

A spatially explicit approach to vole population processes

Renewal of burrows by the common vole as the indicator of its numbers

Space use and juvenile recruitment in gray-tailed voles in response to intruder pressure and food abundance

The effect of Il-1 on basal and hCG-stimulated testosterone secretion by Leydig cells of the bank voles [ Clethrionomys glareolus, S.]

Behavioural variation in two populations of root voles

Airborne and substrate-borne communications of Microtus [Terricola] gerbei and M. [T.] duodecimcostatus

Adrenocortical variability in the life history of bank voles

Homing and space activity in bank voles Clethrionomys glareolus

Influence of operational sex ratio and density on the copulatory behaviour and mating system of Brandt's vole Microtus brandti

Immunolocalization of aromatase and estrogen receptors in bank vole Leydig cells

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

Intersexual attraction in natal dispersing root voles Microtus oeconomus

Spatial structure of Microtus rossiaemeridionalis during population growth

Spatial organization in a small population of the root vole Microtus oeconomus in a linear habitat

Preliminary observations of the cytological structure of the hypothalamo-neurohypophyseal magnocellular neuroendocrine system in field voles after acute thermal stress