Ábrahám Levente (szerk.): Válogatott tanulmányok VII. - Natura Somogyiensis 22. (Kaposvár, 2012)
Winkler D. - Erdő Á.: A comparative study of breeding bird communities in representative habitats of the Sárosfő Nature Reserve area
220 Natura Somogyiensis cies. The community dominance index was the lowest in the riverine ash-alder forest, thus also indicating an optimal bird community structure consisting of species with no extreme dominance. The comparison of bird community diversities of the different habitats using Hutcheson's method yielded significant differences in 11 cases (Table 3). To rank the bird communities of the studied habitats the Rényi's diversity profiles were used (Fig. 3). The result shows that there was no single case of diversity profiles crossing each other, thus the bird communities can be ranked also confirming the results of the Hutcheson's modified t-test indicating significant differences between diversities of certain communities. The diversity profile of the bird community found in the ash-alder forest runs above the curves of other habitat's communities, ft can also be observed that two pairs of diversity profiles, namely the curves of bird communities in the two oak forests (both of the afforestation and of the low pole stand) and also the curves of the two open habitats (reedbed and meadow) run very close to each other. Results of comparison of breeding bird communities in different habitats carried out using cluster analysis based on the Morisita-Hom similarity index is shown on Fig. 4. The dendrogram well emphasises the differences and similarities between bird communities in different habitat types. The reedbed shows a total separation, which means that no common species occurred between this edge habitat and the other studied habitats. The second main group is further subdivided into two subgroups, where a complete separation can be observed between the 'open' habitats (meadow and young pedunculate oak afforestation) and the 'forest' habitats. Inside the 'forest' subgroup, communities of the ash-alder forest and the low pole oak forest were grouped under the same cluster showing at the same time the highest similarity between paired communities, while the bird community of the only coniferous forest habitat, the Scots pine plantation, discretely separated from the two mentioned deciduous forest's communities. W < Urn U. ffi ... S 0.9 0 8- _______________ 0 .7- 0 6- 0.5- 04- 0 3- 0.2- 0 1E J2 = '7 § = h I i Fig. 4: Dendrogram based on cluster analysis using Morosita-Horn index of similarity on the breeding bird communities of different habitats (RB - reedbed, ME - meadow, OA oak afforestation, OF - oak forest, AF ash-alder forest, PF - pine forest)
