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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
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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

Kazimierz Kowalski: A biographical sketch

84%
Pucek Z.
Acta Zoologica Cracoviensia
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1996
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tom 39
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nr 1
3

Chemical information, scent trails and spatial behaviour of small forest rodents. A review

84%
Kozakiewicz M., Kozakiewicz A.
Electronic Journal of Polish Agricultural Universities. Series Biology
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2004
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tom 07
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nr 2
Numerous authors indicate a significant role of chemical information (scent) left in the environment in communication between individuals in natural mammal populations. The basic functions of olfactory signals in small forest rodents are believed to include information related to reproduction: identification of sex, age, sexual status and social position of prospective sexual partners. It seems that scent-marking of movement routes thus creating a network of scent trails in the environment, channelling animal movements and making finding the way easier (particularly in case of long-distance movements) is another very important function of scent marking. Some examples of field experiments that confirmed the concept of scent trails are presented and discussed. However, some experiments suggest that besides the use of olfactory information animals have also other possibilities of finding the way in unknown space.
4

Nests and nesting sites of Brazilian forest rodents [Nectomys aquamipes and Oryzomys intermedius as revealed by a spool-and-line device

84%
Briani D. C., Vieira E. M., Vieira M. V.
Acta Theriologica
|
2001
|
tom 46
|
nr 3
Patterns of nest construction and nest site selection of two murid rodents of the Brazilian Atlantic rainforest were described. The animals were captured in an area of about 1.5 ha of primary forest, marked, equipped with a spool-and-line device and released at the capture point. The next day we followed the thread to find their nests. In total 11 nests of Nectomys squamipes (Brants, 1827) and 13 of Oryzomys intermedius (Leche, 1886) were found. They were all egg-shaped, about 15 cm long and 10 cm wide, without any apparent entrance and consisted of dry leaves and grass. The two species differed in the selection of nest sites. The nests of N. squamipes were close to streams and built inside decomposed fallen logs or using natural entrances between the soil and tangled roots or rocky crevices. Nests of O. intermedius were built under or inside fallen logs and inside aerial root systems of palms. The spool-and-line technique used here is useful to provide detailed information on several aspects of the ecology and natural history of small mammals.
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