DIGITALNA ARHIVA ŠUMARSKOG LISTA
prilagođeno pretraživanje po punom tekstu



ŠUMARSKI LIST 9-10/2011 str. 53     <-- 53 -->        PDF

IZVORNI ZNANSTVENI ČLANCI – ORIGINAL SCIENTIFIC PAPERSŠumarski list br. 9–10, CXXXV (2011), 467-475
UDK 630* 152 + 907 (001)


HABITAT SELECTIONAND SIMILARITY OFTHE FOREST SONGBIRD
COMMUNITIES IN MEDVEDNICAAND ŽUMBERAK –
SAMOBORSKO GORJE NATURE PARKS


IZBOR STANIŠTAI SLIČNOSTI ZAJEDNICAPTICAPJEVICAU ŠUMAMA PARKOVA
PRIRODE MEDVEDNICAI ŽUMBERAK – SAMOBORSKO GORJE


1223


Tamara KIRIN, Jelena KRALJ, Davor ĆIKOVIĆ, Zdravko DOLENEC


ABSREACT: The effect of floristic and structural characteristics of vegetation
on the forest songbird communities in two Nature Parks: Medvednica andŽumberak – Samoborsko gorje was studied. The point-count method was used
for analyzing songbird communities and circular plot method for habitat mapping,
on 101 points at both sites. Non-parametric test were used (Kruskal–
Wallis and Kendal Tau). The tree basal area was used to classify studied
points into five forest types (beech, oak, mixed deciduous, coniferous and
mixed coniferous forests) and as indication of the stand maturity. The total of27 and 32 songbird species were recorded on Medvednica and Žumberak –
Samoborsko gorje respectively. Diversity was higher on Žumberak – Samoborsko
gorje due to greater habitat fragmentation, while population density of
songbirds was greater on Medvednica. Among structural characteristics,
those related to forest age (average tree basal area and number of the small
trees) had the most pronounced effect to the total songbird density and densities
of different ecological groups of birds. Sorensen index showed that in spite
of the differences in floristic composition between particular forest types in
two studied areas (0.475 ± 0.120), songbird communities showed high similarity
(0.872 ± 0.070). The highest similarity of songbird communities between
Parks was recorded in beech and oak stands. Oak stands showed the lowest similarity
in tree species composition and no significant difference in structural
characteristics, while beech stands had many different structural features and
several differences in densities of ecological groups of birds. The greatest difference
of bird densities in the particular forest type between two Parks was
found in beech and mixed coniferous stands. High structural differences between
these two forests were the result of the forest age; bird populations had
higher densities in older stands.


Key words:songbird communities, forest habitat, vegetation structure,
Nature Parks


INTRODUCTION – Uvod


Habitat choice in birds is affected by two groups ofcompetition (Pielou1978). Birds have greater potenfactors:
species requirementsand inter- and intraspecifictial for habitat selection than other taxonomic groups,


1


due to their extreme mobility and diversity of ranges.


Tamara Kirin, dipl. ing., Dipartimento di tecnologie, ingegneria e
scienze dell’Ambiente e delle Foreste (D.A.F.), Universita degli
Great seasonal changes in forest habitats force forest
Studi dellaTuscia, 01100 Viterbo, Italy,


birds, especially migratory insectivores, to re-establish


e-mail: tamara.kirin@unitus.it


their residence annually and quickly in appropriate habi


2


Dr. sc. Jelena Kralj, dr. sc. Davor Ćiković – Institute of Ornithology,
Croatian Academy of Sciences andArts, Gundulićeva 24,
tats.This has probably resulted in strong selective pres-
Zagreb, Croatia, e-mail: zzo@hazu.hr


sures on their patterns on habitat choice (Cody1985,


3


Prof. dr. sc. Zdravko Dolenec, Department of Zoology, Faculty of


SherryandHolmes1985).


Science, University of Zagreb, Rooseveltov trg 6, Zagreb, Croatia