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ŠUMARSKI LIST 11-12/2004 str. 13     <-- 13 -->        PDF

J. Margalctić: DINAMIKA POPULACIJA ŠUMSKIH GLODAVACA U HRVATSKOJ Šumarski list br. II- 12, CXXVIII (2004), 599-607
SUMMARY: Mouse and vole species, due to the population numewusness
and width of the ecological valence, have been an important part of any forest
ecosystem. By a continuous following of dynamics of their population it is
possible to prevent their harmful activities on natural progeny, seeds, plants
and spreading of certain zoonoses (trichinosis, leptospirosis, tick encephalitis,
Lyme disease, haemorrhagic fever with kidney syndrome, etc.)


Following the numewusness and population dynamics of small rodents on
the terrain, analysing the population structure of certain species and determining
the intensity of damages on seeds and young plants, conclusions are
brought and protection measures are recommended in order to decrease their
harmfulness in forest ecosystems. Regular following of small rodent populations
on the terrain results in the timely prediction of period in which their
excessive number can occur. Since small rodents have extremely high biological
potential, in favourable years they appear in a huge number of populations
when they do big damages. Then, a forest operative carries out protection
measures which are most frequently done by chemical agents.


In the period from September 1999 till June 2003, the number of small
rodents was followed on 17 sites in Croatia. Animals were sampled in 10 forest
communities with "Y" method, standard minimum method and the linear
transect method. 2151 individuals were caught. By all the methods there were
27 598 traps/night. At most of the sites, the following species were most present:
Clethrionomys glareolus Schr, Apodemus agrarius Pall and A. flavicollis
Melch. In a forest community Carpino betuli-Quercetum roboris typicum


R. the smallest number of small rodents was calculated by a linear regression
method (p = 0.05) in April, 2003 (N/ha = 11.63), and the greatest in March
2001 (N/ha = 82.03). On the same site, the number of the small rodent population
was calculated by "Y" method in spring 2001 of 101.34 individual/ha.
It was established that the number of small rodent population significantly
depends on the forest seed crop.
The average values of mice and voles catch were established by a method
of linear transect in pedunculate oak forests fQuercus robur L.) in 44.70 %
traps of set transects (October, 2000, site Velika Gorica) and in common
beech forests (Tagus sylvatica L.) in 58,70 % traps (March 2002, site Nova
Gradiška).


Key wo rds: small rodents, population dynamics, forest