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1

Can demographic parameters be estimated from capture-recapture data on small grids? A test with forest rodents

100%
Schlesser M., Le Boulenge E., Schtickzelle N.
Acta Theriologica
|
2002
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tom 47
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nr 3
This preliminary study proposes small trapping grids as an alternative to traditional large grids for the simultaneous monitoring of several rodent populations by capture­-recapture. Monthly trapping sessions of wood mouse Apodemus sylvaticus (Linnaeus, 1758) and bank vole Clethrionomys glareolus (Schreber, 1780) were carried on over a small area (0.015 ha, 21 traps). The coherence of demographic parameter estimates on such small grids with those obtained on classical large grids was checked by performing two trapping sessions on a larger grid (0.9 ha, 110 traps, 10 m mesh) surrounding the small grid. We compared the two grid designs on the basis of sex ratio upon first capture, trap saturation rate, minimum number alive (MNA), monthly survival, and trappability. These demographic parameters proved to be non-biased by the trapped area, even though the precision was lower on the small grid. Small grids seem therefore to give the same picture of population dynamics as classical large grids except for parameters sensitive to an edge effect (eg density). By decreasing significantly the trapping effort, small grids will be of particular interest whenever the simultaneous operation of several trapping grids is needed (eg to compare different environmental conditions).
2
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Abundance of wild rodents, ticks and environmental risk of Lyme borreliosis: a longitudinal study in an area of Mazury Lakes District of Poland

100%
Sinski E., Pawelczyk A., Bajer A., Behnke J. M.
Annals of Agricultural and Environmental Medicine
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2006
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tom 13
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nr 2
The results of a longitudinal epidemiological survey in two contrasting habitats in an area of the Mazury Lakes district of Poland indicate that both host and vector (Ixodes ricinus) densities, may be the most important risk factors for the tick-transmitted spirochetes of Borrelia burgdirferi s.l. However, the results also highlight that even related host species, such as the wild rodents Apodemus flavicollis and Clethrionomys glareolus that share the same habitat, can show quite different dynamics of tick infestation. We provide evidence that the woodland populations of A. flavicollis and C. glareolus are more frequently infested with larvae than nymphs, and more frequently with both stages than M. arvalis in the neighbouring open fallow lands. The prevalence of infestation with larvae varied from 92% for A. flavicollis, and 76% for C. glareolus to 37% for M. arvalis. Other factors, such as population age structure and sex, were also shown to impact on tick densities on hosts at particular times of the year and hence on the zoonotic risk. Moreover, particular species of rodents from different habitats, A. flavicollis (woodlands) and Microtus arvalis (fallow lands) carry infected immature I. ricinus ticks more frequently than C. glareolus voles (woodlands). Thus, the relative contribution of each species to the cumulative reservoir competence differs among species living in the woodland habitats and in relation to voles living in the fallow lands. It follows, therefore, that any factor which reduces the relative density of A. flavicollis in comparison to other hosts in the wild rodent community, will reduce also the risk of human exposure to Lyme borreliosis spirochetes.
3

Of mice and men: space, resources, and population

84%
Fuller W. A.
Polish Ecological Studies
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1994
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tom 20
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nr 3-4
4

Assessment of Akodon cursor (Rodentia, Sigmodontinae) as permissive host to Schistosoma mansoni infection: morphology of adult worms

67%
Machado-Silva J. R., Heisler Neves R., Rodrigues-Silva R., Figueiredo de Oliveira R. M., Maldonado Junior A.
Acta Parasitologica
|
2011
|
tom 56
|
nr 2
The natural infection with parasitic helminths is common in wild rodent populations. Once such interactions are better understood in the laboratory, it will be more feasible to extend the findings to infected hosts in nature. The flukes recovered from laboratory-infected Akodon cursor at 63 days post-infection were stained with hydrochloric carmine and individually mounted on glass slide as whole-mounts. Light and laser scanning confocal microscopy studies of adult male and female Schistosoma mansoni are reported. The parasites were examined morphologically and biometrically, which was obtained in a digital system for image analysis. Parameters used were: tegument thickness, digestive, excretory and reproductive systems. The overall conclusion of this experiment is that the morphological features of adult worm were similar to laboratory mice. It has been confirmed that the grass mouse is a permissive host to S. mansoni infection.
5

Trappability of Clethrionomys glareolus and Apodemus flavicollis do rodents learn to avoid traps or get used to them?

67%
Cybulska A.
Polish Ecological Studies
|
1996
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tom 22
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nr 3-4
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