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

• Autorzy: Lofgren O. , Hornfeldt B. , Eklund U.
• Języki publikacji: EN

Abstrakty

EN

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 mates did not change significantly. The rise in density of adult females, but not of adult mates, 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.

Słowa kluczowe

EN

Clethrionomys glareolus; food supplementation; food; vole; body mass; growth; density

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 1996
• Tom: 41
• Numer: 4
• Opis fizyczny: p.383-394,fig.

Twórcy

autor

Lofgren O.

• Umea University, S-901 87 Umea, Sweden

autor

Hornfeldt B.

autor

Eklund U.

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