DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/2003 str. 13     <-- 13 -->        PDF

J. Margaktić, M. Glavaš, K. Pavić: BROJNOST SITNIH GLODAVACA I NJIHOVA ŠTETNOST U GJ "JUŽNA ... Šumarski list br. 3-4, CXXVI1 (2003), 99-107
belong to species from the genus Apodemus, while only 8 % of the catch
belongs to voles (genus Clethrionomys,). The most numerous species was
A. agrarius. In one transect the catch in 20 % of placed traps was recorded.
Most animals were caught in October and November and the least in March.
The higher number of rodents was determined in the forest in comparison to
a nurserry which is explained by a more high-quality habitat conditions.
Acorn was collected in order to establish damages from small rodents on a
bay oak acorn and a durmast oak acorn in the shape of various intensity bites
1—2 mm wide. The acorn was divided into two categories: damaged and
undamaged acorn. The damaged acorn was additionally analysed for the
presence of insects Curculio glandium (L.) and Cydia spp. in order to determine
if small rodents cause damages only on healthy seeds or if they damage
seeds previously damaged by insects. The acorn was collected in the autumn
1999 on five experimental plots, dimensions 10x10 meters. The acorn yield
was poor. The following damages were recorded in the pedunculate oak forest:
from small rodents 22.33 %, from insects 13.49 % and from rodents and
insects together 7.44 % of samples. In a sample of sessile oak damages were


from
small rodents 13.41 %, from insects /3.42 % and from rodents and
insects together 4.88 % of samples.


In conditions of poor acorn yield rodents caused damages on approximately
40 % of samples (damages only from rodents and from rodents and insects
together). Most acorns damaged by rodents were noticed on a sample not previously
damaged by insects. The damage intensity on young plants was determined
on the experimental plot on which the numerousness of small rodents
was also followed. The total of four experimental plots dimensions 3x3 were
set up on places rich with young plants. One analysis included about
257 plants. In the period from October 1999 till March 2000 plants were
examined four times. Damages on young plants were recorded on 7.39 % of
samples. In order to take protection measures on time, the regular determination
of numerousness of small rodent population has been recommended.


Key words: small rodents, damages, forest seeds, forests stand, nursery