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Type of publication: Diploma Thesis
Type of document:

Year: 2010

Authors: Brandstetter, Petra

Title: Parasitologische Untersuchung einer geschlossenen Fledermauspopulation der Art Nyctalus Noctula (Großer Abendsegler) aus Wien.

Other title: Parasitological examination of a closed population of bats (Nyctalus Noctula) from Vienna

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 49.


Advisor(s):

Löwenstein Michael

Reviewer(s):
Kübber-Heiss Anna

Vetmed Research Units:
Institute of Parasitology


Graduation date: 10.01.11


Abstract:
This diploma thesis deals with the examination of a closed population of bats in Austria. The genus examined is identified as Nyctalus noctula. Overall 100 bats with 67 of them being females and 33 males are examined by dissection and analyses of the contents of the intestine. All animals are shown to host diverse developmental stages of helminths in their gastrointestine. The parasites are identified as nematodes named Molinostrongylus skrijabini as well as trematodes, which are not classified in detail. Interestingly, males are generally stronger infected with parasites than females. The genus examined was identified as Nyctalus noctula. Overall 100 bats, 67 females and 33 males were examined by dissection and analyses of the contents of the intestine. The content of the intestine was processed via the flotation method and the intestine washed out. These methods allowed detection of diverse developmental stages of helminths and further analyses via conventional microscopy and stereomicroscopy. The parasites were preserved and also stored in glycerine-alcohol. Some of the nematods were embedded in glycerine-alcohol and some of the well preserved specimens of the trematods were stained in boraxcarmin and embedded in canadabalsam and investigated via microscopy under 200 – 400fold magnification. In examination of gastrointestine of 100 animals, nematodes, larvae of nematodes and trematodes, but no cestodes and protozoan were found. Adult nematode stadia were identified as Molinostrongylus skrijabini. In flotation technique only 3 nematode eggs could be found. The mean load of nematodes was 27 helminths per host. Male bats were stronger infected with nematodes (average of 36 Nematodes per bat) than females (average of 22 Nematodes per bat). Additionally, trematodes of different sizes as well as eggs were found. The trematodes were divided into 4 groups (small, medium, large and very large). The percentage of bats infected with trematodes was 22 percent of the population. Males had a higher prevalence of parasites (average of 26 trematodes per bat) than females (average of 20 trematodes per bat).


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