Spatial Organization of Cyclic Clethrionomys Females: Occupancy of All Available Space at Peak Densities?

Löfgren, Ola

doi:10.2307/3546034

Cited by 34 publications

(28 citation statements)

References 31 publications

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“…Loss rate and dispersal of adults were unaffected by the extra food. This result is in line with other studies on Clethrionomys voles, and it suggests a high degree of residency among individuals already settled as breeders (eg Bondrup-Nielsen 1984, Gliwicz 1990, 1992, Lofgren 1995a). …”

Section: Loss Rates Dispersal and Immigrationsupporting

confidence: 81%

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Effect of supplemental food on a cyclic Clethrionomys glareolus population at peak density

Löfgren¹,

Hörnfeldt²,

Eklund³

1996

Acta Theriol.

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Lofgren O., Hornfeldt B. and Eklund U. 1996. Effect of supplemental food on a cyclic Clethrionomys glareolus population at peak density. Acta Theriologica 41: 383-394.The impact of supplemental food on a cyclic bank vole Clethrionomys glareolus (Schreber, 1780) population was studied at peak density. We provided high energy food (sunflower seeds) to a 3.15 ha live-trapping grid and used a 5.06 ha unfed grid as a control. Density of adult females and immatures increased 3-fold in response to the extra food. In contrast, density of adult males did not change significantly. The rise in density of adult females, but not of adult males, altered the functional sex ratio. Loss rate of fed adults remained the same as for controls, whereas immature loss rate was reduced by the extra food. Dispersal of immatures from the control into the food supplemented grid was higher than the reverse. Growth and body mass of fed immatures were lower than of controls. Reduced dispersal and increased immigration of immatures both contributed significantly to the overall rise in density when food was added.

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Section: Loss Rates Dispersal and Immigrationsupporting

confidence: 81%

“…1; see also Hornfeldt 1994). The present control grid was used in a long term vole trapping programme in 1980-1984(Lofgren 1989, 1995a. During the food supplementation period each trapping session (2-3 days) comprised 6-9 complete trap checks at 6-12 h intervals (morning, noon and evening).…”

Section: Vole Trapping and Food Manipulationmentioning

confidence: 99%

Effect of supplemental food on a cyclic Clethrionomys glareolus population at peak density

Löfgren¹,

Hörnfeldt²,

Eklund³

1996

Acta Theriol.

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“…This follows predator-prey theory suggesting that predators capture prey with decreasing efficiency, thus leveling out spatial dissimilarities in prey numbers (Ims and Steen, 1990;Hansen et al, 1999). The greater rate of population increase at case sites compared to control sites during the reproductive period could be a function of either higher reproductive output per area unit; increased survivorship; greater immigration; or a combination of the above (Hansson, 1994;Lö fgren, 1995).…”

Section: Discussionmentioning

confidence: 99%

“…This pattern was significant in the peak year of 1995 when the three NE case sites were identified (Ahlm et al, 1997) and also during 1998, and was consistent but not significant for the remaining fall samples. These site-specific differences in bank vole dynamics probably reflect crucial attributes of the case sites (Hansson, 1990(Hansson, , 1999Lö fgren, 1995;). The population dynamics of bank voles and occurrence of PUU virus have previously been shown to be spatially heterogeneous at regional and local scales (Verhagen et al, 1986;Escutenaire et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Hantavirus Antibody Occurrence in Bank Voles (Clethrionomys Glareolus) During a Vole Population Cycle

Olsson

Ahlm

Elgh

et al. 2003

Journal of Wildlife Diseases

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Puumala virus, genus Hantavirus, is the etiologic agent of nephropathia epidemica, a mild form of hemorrhagic fever with renal syndrome. The bank vole (Clethrionomys glareolus) is the natural reservoir species of this hantavirus. We initiated sampling of bank voles at sites of recently identified human nephropathia epidemica cases and paired control sites in the fall of 1995 in coastal areas of northern Sweden. Sites were trapped annually in spring and fall until 1999. Prevalence of antibody to Puumala virus was similar among local bank vole populations in the two types of sites over time. During peak years, however, the absolute number of bank voles was higher in case sites than control sites. Consequently, the likelihood of Puumala virus exposure was increased at case sites during population highs. This would imply that the risk of Puumala virus exposure to conspecifics and humans is habitat and site dependent with a temporal component.

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“…The duration of the breeding season markedly varies depending on food availability, but usually starts in April and ends Septemberearly October (Corbet and Harris 1991;authors, unpublished work). Females are territorial and philopatric (Bujalska 1985;Ostfeld 1985Ostfeld , 1990Löfgren 1995). Natal dispersal of females is often limited to the areas adjacent or very close to their mother's territory (Kawata 1987;Ylönen et al 1988).…”

Section: The Study Organismmentioning

confidence: 99%

Reproduction and population density affect humoral immunity in bank voles under field experimental conditions

Saino¹,

Canova

Fasola

et al. 2000

Oecologia

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Density dependence is a common feature in the dynamics of animal populations. Availability of food resources critical to immunity is likely to be one of the mechanisms mediating the effect of population density on individual fitness. The ability to mount an immune response to an antigen is also affected by levels of immunosuppressive hormones associated with reproduction or mediating the response to ecological and social stress. We assessed variation in condition and intensity of humoral immune response to a T-cell-dependent antigen in bank voles (Clethrionomys glareolus) by experimentally altering population density before immunisation. Consistent with our prediction, males had lower humoral immunocompetence in the breeding than in the non-breeding season. Contrary to our expectation, males did not show enhanced immunocompetence and females showed depressed humoral immune response under experimentally lowered population density. Variation of immune response in relation to population density depended on sex, with females but not males showing lower immune response under experimentally reduced density. We conclude that humoral immunity of bank voles was affected by reproduction and social environment rather than by population density.

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Spatial Organization of Cyclic Clethrionomys Females: Occupancy of All Available Space at Peak Densities?

Cited by 34 publications

References 31 publications

Effect of supplemental food on a cyclic Clethrionomys glareolus population at peak density

Effect of supplemental food on a cyclic Clethrionomys glareolus population at peak density

Hantavirus Antibody Occurrence in Bank Voles (Clethrionomys Glareolus) During a Vole Population Cycle

Reproduction and population density affect humoral immunity in bank voles under field experimental conditions

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