Disease patterns in field and bank vole populations during a cyclic decline in central Finland
| Autor: | Heikki Henttonen, R. Tanskanen, Antti Sukura, Juha Laakkonen, R. Schildt, J. Husu-Kallio, E. Rudbäck, Voitto Haukisalmi, Timo Soveri |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
0106 biological sciences
Male Veterinary medicine Aerobic bacteria Field vole Immunology Kidney 010603 evolutionary biology 01 natural sciences Microbiology Communicable Diseases 03 medical and health sciences Prevalence Immunology and Allergy Animals Frenkelia Microtus Muscle Skeletal Lung Finland 030304 developmental biology Muridae 0303 health sciences Bordetella bronchiseptica General Veterinary biology Arvicolinae Myocardium Brain General Medicine Organ Size biology.organism_classification Bank vole Intestines Infectious Diseases Liver Vole Female |
| Zdroj: | Comparative immunology, microbiology and infectious diseases. 23(2) |
| ISSN: | 0147-9571 |
| Popis: | Declining field vole ( Microtus agrestis ) and bank vole ( Clethrionomys glareolus ) populations were sampled (117 field voles and 34 bank voles) in south-central Finland during the winter of 1988–89. The last surviving field voles were caught in April and bank voles in February. A subsample (16) of the April field voles were taken live to the laboratory for immunosuppression. The histopathology of the main internal organs and the presence of aerobic bacteria and certain parasites were studied. In the lungs, an increase in lymphoid tissue, probably caused by infections, was the most common finding (52% of all individuals). The prevalences in the voles, in the whole material, of Chrysosporium sp. and Pneumocystis carinii in lungs were 13 and 10% in field voles, and 9 and 0% in bank voles, respectively. Cysts of Taenia mustelae (9 and 27%) were the most common pathological changes in the liver. Enteritis was also rather common (14 and 34%). In field voles the prevalences of Frenkelia sp. in the brain and Sarcocystis sp. in leg muscles were low (both 6%). Bordetella bronchiseptica was commonly (31%) isolated from field vole lungs and Listeria monocytogenes from the intestines (34%). Salmonella spp. could not be found. The dynamics and abundance of inflammations in the lungs and intestines, as well as B. bronchiseptica isolations from the lungs, indicate that obvious epidemics took place in declining vole populations. Of the Luhanka subsample of 16 field voles brought to the laboratory in April, one died of listeriosis, two of Bordetella , and five died for unknown reasons. Even if small mustelids are the driving force in microtine cycles, it is possible that diseases also contribute to the decline. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect