Ecological and faunistic analyses of the trematodes of the Little Grebe (Tachybaptus ruficollis (Pallas, 1764)) in Azerbaijan

Keywords: Azerbaijan, waterfowls, parasites, helminthes, Trematodes


The research was conducted from 1998 to 2019 at the nine water bodies of Azerbaijan. During the study, 94 individuals of the Little Grebes (Tachybaptus ruficollis (Pallas, 1764)) were examined by the method of complete helminthological dissection. As a result, 12 trematode species belonging to one order, seven families, and eight genera were found: Patagifer bilobus, Petasiger megacantha, P. skrjabini, Echinochasmus coaxatus, E. dietzevi, E. mordax, Mesorchis pseudoechinatus, Cryptocotyle concavum, Metorchis intermedius, Eucotyle cohni, Strigea falconis, Hysteromorpha triloba. Of these, three species (Petasiger megacantha, Echinochasmus coaxatus and E. dietzevi) are specific grebe parasites, while the others infect various waterfowl. Except for Strigea falconis, whose cercariae penetrate actively into the bird’s body and transform into metacercarie, all the trematode found are ingested by the birds and mature in their intestine. The grebe, as a fish-eating bird, is infected with six trematode species (Patagifer bilobus, Petasiger megacantha, Mesorchis pseudoechinatus, Cryptocotyle concavum, Metorchis intermedius, Hysteromorpha triloba) that parasite in fish at the stage of metacercaria. Other species use aquatic invertebrates as second intermediate hosts. We established that species diversity of the grebe trematodes depended on the reservoir size and the richness of its hydrofauna, increasing with the increase of both factors. The differences between the faunas of grebe trematodes in various water bodies depended on the distance between them and the similarity of their living conditions. Seven grebe trematode species (Petasiger megacantha, P. skrjabini, Echinochasmus coaxatus, E. dietzevi, Cryptocotyle concavum, Metorchis intermedius, Eucotyle cohni) belong to the northern group of helminthes, while the five species (Patagifer bilobus, Echinochasmus mordax, Mesorchis pseudoechinatus, Strigea falconis, Hysteromorpha triloba) are ubiquitous. Southern trematode species were absent from the examined birds. Presumably, this can be explained by the dominance of grebes from northern populations wintering on the water bodies of Azerbaijan.


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Author Biography

Y. Mahmudova, Institute of Zoology, Azerbaijan NAS

A. Abbaszadeh Str., passage 1128, block 504, Baku, AZ1073,


Aliyev Sh.K. (2006). Ecological-faunistic and epizootological characteristics of the parasitic complex of hunting and fishing birds of the North Caucasus. Abstract of the thesis for the Degree of the Candidate of Biological Sciences. М., 52 p. (in Russian)

Belopol’skaya M.M. (1966). Sandpiper trematodes of the Black Sea coast, Proc. Sci. Conf. of the Vavilov Society of Geneticists, pt. 3. p. 35. (in Russian)

Bykhovskaya-Pavlovskaya I.E. (1962). Trematodes of birds of the fauna of the USSR (ecological-geographical survey). M.-L.: Publishing house of the Academy of Sciences of the USSR. 407 p. (in Russian)

Chikhlyayev I.V., Kirillova N.Y., Kirillov А.А. (2012). Life cycle characteristics of trematodes (Trematoda) of terrestrial vertebrates of the Middle Volga. Bulletin of Samara Scientific Center of the Russian Academy of Sciences, 14(5), 132–142. (in Russian)

Czekanowski I. (1913). Zarys metod statystuznych. Vol. 2. Warszawa. 178 s.

Dogel V.A. (1949). Biological features of the parasitic fauna of migratory birds. Bulletin of the Academy of Sciences of USSR, Biological Series, 1, 99–107. (in Russian)

Dorovskikh G.N., Stepanov V.G. (2009). Methods for collecting and processing parasitological materials (textbook). Syktyvkar: Publishing house of Syktyvkar University. 131 p. (in Russian)

Dubinina M.N. (1971). Parasitological study of birds. L. 140 p. (in Russian)

Faltýnková A., Gibson D.I., Kostadinova A.A. (2008). Revision of Patagifer Dietz, 1909 (Digenea: Echinostomatidae) and a key to its species. Systematic Parasitol., 70, 159–183.

Gaevskaya A.V., Gusev A.V., Delyamure S.L. et al. (1975). Keys to vertebrate parasites of the Black and Azov seas. Kiev: Naukova Dumka. 552 p. (in Russian)

Ginetsinskaya T.A., Dobrovolsky A.A. (1978). Private parasitology. M.: Higher school. 303 p. (in Russian)

Ginetsinskaya T.A., Kulik T.N. (1952). Deciphering the developmental cycle of the trematode Patagifer bilobus (Rud., 1819). Proceedings of the USSR Academy of Sciences, 85(5), 1189–1192. (in Russian)

Isakova N.P. (2008). Reproduction of parthenitis of the redioid species of trematodes. Abstract of the thesis for the Degree of the Candidate of Biological Sciences. St. Petersburg. 23 p. (in Russian)

Iskova N.I. (1983). Family Echinostomatidae. In: Shigin, A.A. (Ed.). Trematodes of birds of the Black Sea and Caspian Sea regions. М.: Nauka. 1983, 73–96. (in Russian)

Krone O., Streich W.J. (2000). Strigea falconis in Eurasian Buzzards from Germany. J. wildlife diseases, 36(3), 559–561.

Linnik V.Ya. (1984). Helminthic zoonoses in Belarus transmitted from fish (epizootology, pathogenesis, prevention). Abstract of the thesis for the Degree of the Candidate of Biological Sciences. Minsk. 47 p. (in Russian)

Lunaschi L.I., Drago F.B. (2009). Digenean parasites of six species of birds from Formosa Province, Argentina. Rev. Mex. Biodivers., 80, 39–46.

Mahmudova E.A., Ibrahimov Sh.R. (2020). Dependence of trematode fauna of the waterbirds of Azerbaijan on their seasonal migration. Inland Water Biology, 13, 455–462.

McDonald M.E. (1961). Key to Trematodes in waterfowl. Washington: Resource Publication. 157 p.

Musselius V.A., Vanyatinsky V.F., Vikhman A.A. (2008). Laboratory workshop. M.: Light and food industry. 296 p. (in Russian)

Drago F.B., Lunaschı L.I., Draghı R. (2014). Digenean fauna in raptors from northeastern Argentina, with the descripti¬n of a new species of Strigea (Digenea: Strigeidae). Zootaxa, 3785(2), 258–270.

Olinda R.G., de Souza M.C., Dias G.F. et al. (2015). Strigea falconis infection in Buteo magnirostris in Brazil. Acta Scientiae Veterinariae, 43(1–4), 76–95.

Pronina S.V., Pronin N.M. (2007). Methodical handbook on hydroparasitology (Part 1. Technique of parasitological research). Ulan-Ude. 52 p. (in Russian)

Razmashkin D.A. (1978). On the species belonging of metacercariae of the genus Metorchis (Trematoda, Opisthorchidae) from fishes of Western Siberia. Parazitologiya, 12(1), 68–78. (in Russian)

Selbach C., Soldánová M., Georgiyeva S. et al. (2014). Morphological and molecular data for larval stages of species of Petasiger megacantha (Kotlan, 1922) (Digenea: Echinostomatidae) with an updates key to the known cercariae from Palearctic. Syst. Parasitol., 89, 153–166.

Shakarboev E.B., Akramova F.D., Azimov D.A. (2012). Trematodes are parasites of vertebrates in Uzbekistan. Tashkent: Chinor. 192 p. (in Russian)

Smogorjevskaya A.A. (1976). Helminthes of waterfowl and wetland birds of the fauna of Ukraine. Kiev: Naukovaya dumka. 416 p. (in Russian)

Soerensen T.A. (1948). A method of establishing groups of equal amplitude in plant sociology based on similarity of species and its application to analyses of the vegetation on Danish commons. Kgl. Danske vidensk. Selsk., 5(4), 1–34.

Turemuratov A. (1964). Helminths of fish-eating birds of the Aral Sea basin (taxonomy, faunistics, ecology). Abstract of the thesis for the Degree of the Candidate of Biological Sciences. M. 18 p. (in Russian)

Urazbaev A.N., Kurbanova A.I. (2006). The parasite fauna of the Far Eastern fish introduced into the water bodies of the Southern Aral Sea region. Bulletin of zoology, 40(6), 535–540. (in Russian)

Vaidova S.M. (1978). Helminths of birds of Azerbaijan. Baku: Elm. 238 p. (in Russian)

Wootton D.M. (1957). The Life History of Cryptocotyle concavum (Creplin, 1825) Fischoeder, 1903 (Trematoda: Heterophyidae). J. Parasitol., 43(3), 271–279.

How to Cite
Mahmudova, Y. (2022). Ecological and faunistic analyses of the trematodes of the Little Grebe (Tachybaptus ruficollis (Pallas, 1764)) in Azerbaijan. The Journal of V.N.Karazin Kharkiv National University. Series «Biology», 38, 35-41.