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ŠUMARSKI LIST 5-6/2014 str. 60     <-- 60 -->        PDF

on four localities ticks were sampled (Krčmar 2012). Therefore, the aim of this study was to investigate the tick fauna diversity and differences in abundance of ticks at five different habitats in the surroundings of the city Beli Manastir in Baranja.
Material and methods
Materijal i metode rada
This study was carried out at five localities in the Croatian part of Baranja in the surroundings of the city Beli Manastir. Croatian part of Baranja extends from the Drava and Danube Rivers to the border with Hungary. The Croatian part of Baranja is a part of a wider Baranja region, the larger part of which is in Hungary (Bognar et al. 1975). Surface of Croatian part of Baranja is 1 147 km2 (Bognar et al. 1975). Beli Manastir is the biggest settlement, the single city in the area of Croatian part of Baranja, located in the bottom of Bansko Hill, in lowland area (Bognar et al. 1975). The autochthonous forest flora, which in the past were oak forests, is partially maintained in Haljevo Forest, on southern side of Beli Manastir, while from all other sides the city is surrounded with agricultural land. Hard ticks were sampled using the flag dragging method, in the period from mid-March to mid-October 2013. Ticks were sampled once a month in different habitats, on pond edges and melioration channels near to agricultural land, in Haljevo Forest, on meadow near city pools and in park in the center of the city. Length of each transect, on which ticks were sampled, was 20 m. Some tick specimens were hand picked on home pets. All collected ticks were stored in 96 % ETOH solution, and were identified using standard keys for European ticks (Hillyard 1996) via stereomicroscope. Diversity of the tick fauna in these five different habitats was measured by Sørenson index.
Results
Rezultati
In five different habitats in Croatian part of Baranja, in the surroundings of the city Beli Manastir, 1254 ticks were sampled. All ticks were sampled by the flag dragging method. Additionally 240 ticks were collected on home pets, 65 on dogs and 175 on cats. Five species of hard ticks from family Ixodidae were identified in collected tick fauna and most abundant species among these was Ixodes ricinus (Linnaeus, 1758) (65.93 % of the sampled ticks) followed by Haemaphysalis concinna (Koch, 1844), (31.66 %), Haemaphysalis inermis (Birula, 1895) (1.94%), Dermacentor reticulatus  (Fabricius, 1794) (0.4 %), and  Dermacentor marginatus (Sulzer, 1776) representing 0.07% of the sampled tick individuals (Table 1). The highest number (55.49 %) of sampled ticks were in larval stage, 24.83 % in nymphal stage, and 19.68 % were adults (Table 2). The largest number of ticks (80.45 %) was sampled in forest habitat, that is in Haljevo Forest. These were the following species: D. marginatus, H. concinna, H. inermis and I. ricinus (Table 3). On the rest of the four sampled habitats and pets, only 19.54 % of ticks were found. On habitats near to the pond edges and meadows, only  I. ricinus was sampled, while on vegetation near to melioration channels D. reticulatus was collected (Table 4). Only in park, located in the city center, no ticks were found (Table 4). Concerning the sampling done on pets, only I. ricinus was collected. Analyses of seasonal dynamics of sampled ticks in the forest type of habitat reveals two peaks of abundance, one in March, and other in July (Table 3). On pets, the highest number of ticks (60.83%) was sampled in April, in adult stage (Table 5). Comparison of hard tick fauna on five habitats via the Sørenson index showed that fauna of  pond edges and meadow near to city pools were most similar to each other (100 %). However, between Haljevo Forest and pond edges, Haljevo Forest and meadow, Sørenson index values were smallest (40 %). In Haljevo Forest, in the period from March– July 2013, with the flag dragging method, 26 adults, 1 nymph and 2 larvae of H. inermis were sampled. The collection of H. inermis represents a new record, not only for the area of eastern Croatia, but also for the area of continental part of Croatia (Figure 1).