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ŠUMARSKI LIST 3-4/2011 str. 52     <-- 52 -->        PDF

Z. Sedlar, V. Hršak, R. Šoštarić: NUMERICALAND PHYTOSOCIOLOGICALANALYSIS OF ... Šumarski list br. 3–4, CXXXV (2011), 1-3


Figure 1.Geographical position of the study area. Islands of Brač (1), Hvar (2), Korčula (3), the Pelješac Peninsula (4) and
Biokovo Mountain (5).


Slika 1. Zemljopisni položaj proučavanih područja. Otoci Brač (1), Hvar (2), Korčula (3), poluotok Pelješac (4) Biokovo (5).


ranean we used data from Dalmatia, Eastern, Central
and West Mediterranean taken from Bergmeier 1990
and 2002,Brullo &al. 2001Sánchez-Gómez &


Data processing –


The relevé table based on the Braun-Blanquet scale
was transformed into a data matrix using theVan der
Maarel 1979 ordinal transformation for further statistical
analysis.The table was purified before transformation
by removing species with only one and two
appearances, thus reducing the total number of species
from 239 to 193 species.A cluster analysis was performed
on this data matrix using the Bray-Curtis distance
(Bray & Curtis 1957) as a resemblance
measure, and the UPGMA(group average) linkage as
clustering method. Indicator species analysis (Dufrene
&Legendre 1997) was then performed on the
groups defined by the clustering results to obtain the
optimal number of clusters. Relevés were clustered
into a different number of clusters (3, 5, 6, 7, 9, 12 and
15) using a cluster dendrogram.The optimal number of


Results –


According to the ISA analysis and its method of
dendrogram pruning, the obtained optimal number of
clusters was 7. Figure 2 represents the group average
clustering dendrogram divided according to this result.


In our research, on these newly formed clusters we
can distinguish different syntaxa, determined by the
relevé authors and grouped in clusters based on the
cluster analysis and ISA.


Inspection of this dendrogram shows a clear separation
of the cluster marked as number 7, which includes
relevés of the higher (1150–1400 m) parts of Biokovo,
Alcaraz 1992.As in all mentioned areas, from which
data was taken, there is a different taxon of Pinus nigra
complex.All were treated as one taxonPinus nigras.l.


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clusters in the cluster analysis was obtained using the
lowest average probability value, computed in separate
indicator species analyses for each number of clusters
(McCune & Grace 2002). The probability value
was computed using the Monte Carlo permutation test
with 4999 random permutations. Species with indicator
values over 50.0 (IV> 50) and a probability level under


0.05 (p<0.05) were then marked as indicator species
(McCune & Grace 2002). Synoptic table with
combined data from Dalmatia and other parts of
Mediterranean was used to make data matrix on which
Nonmetric multidimensional scaling (NMS) using the
Bray-Curtis distance (Bray &Curtis 1957) as a resemblance
measure was performed. Numerical analyses
were done using PCOrd 5.0 software (McCune &
Mefford1999).


Rezultati


taken by Domac 1965 and phytosociologically defined
as theJunipero sibiricae -Pinetum dalmaticae association.
This cluster is separated at the beginning of clustering
and is completely distinguished from all other
relevé groups. The syntaxonomical classification of
relevés from cluster 7 is the object of this research.


Clusters 1-6 are separated on the other side and are
composed of relevés from the coastal part of the Dalmatian
pine distribution area and of three relevés from
the lower part of Biokovo Mountain.Cluster 1 comprises
relevés taken by Domac 1965 on the islands of