<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Species diversity and composition of the parasite communities of barbel (<italic>Barbus barbus</italic>) at the infracommunity and component community levels were studied in the Lower Danube River, Bulgaria. During the two-year investigations, five parasite species have been found in 92 host fish: <italic>Bathybothrium rectangulum</italic> (Cestoda), <italic>Acanthocephalus anguillae</italic> and <italic>Pomphorhynchus laevis</italic> (Acanthocephala) and larval stages of <italic>Contracaecum</italic> sp. and <italic>Raphidascaris acus</italic> (Nematoda). <italic>Bathybothrium rectangulum</italic> and <italic>R. acus</italic> found in barbel represented new host records in Bulgaria. Parasite communities of barbel were species-poor and highly unbalanced. <italic>Pomphorhynchus laevis</italic> represented the dominant (core) species (prevalence 98.9 %), the second most frequent component parasite was <italic>Contracaecum</italic> sp. (P = 14.1 %) and remaining three species occurred only accidentally in barbels. Differences in species richness, prevalence, intensity of infection and ecological indices between individual seasons (spring, summer, autumn) were statistically significant, but considerably affected by unequal species structure of communities with highly prevailing <italic>P. laevis</italic>. Low parasite species diversity of barbel and low values of most ecological indices, when compared with previous studies in this area (or other Bulgarian parts of the River Danube) might indicate that environmental conditions are impaired and thus, not favourable for the development of barbel parasites (primarily to their intermediate host survival) in the Lower Danube River of Bulgaria.</p></abstract>

Species diversity and composition of the parasite communities of barbel (Barbus barbus) at the infracommunity and component community levels were studied in the Lower Danube River, Bulgaria. During the two-year investigations, five parasite species have been found in 92 host fish: Bathybothrium rectangulum (Cestoda), Acanthocephalus anguillae and Pomphorhynchus laevis (Acanthocephala) and larval stages of Contracaecum sp. and Raphidascaris acus (Nematoda). Bathybothrium rectangulum and R. acus found in barbel represented new host records in Bulgaria. Parasite communities of barbel were species-poor and highly unbalanced. Pomphorhynchus laevis represented the dominant (core) species (prevalence 98.9 %), the second most frequent component parasite was Contracaecum sp. (P = 14.1 %) and remaining three species occurred only accidentally in barbels. Differences in species richness, prevalence, intensity of infection and ecological indices between individual seasons (spring, summer, autumn) were statistically significant, but considerably affected by unequal species structure of communities with highly prevailing P. laevis. Low parasite species diversity of barbel and low values of most ecological indices, when compared with previous studies in this area (or other Bulgarian parts of the River Danube) might indicate that environmental conditions are impaired and thus, not favourable for the development of barbel parasites (primarily to their intermediate host survival) in the Lower Danube River of Bulgaria.

New data on endohelminth communities of barbel <italic>Barbus barbus</italic> from the Bulgarian part of the River Danube

Department of Ecology and Environmental Protection

Helminthologia

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

New data on endohelminth communities of barbel  from the Bulgarian part of the River Danube

Species diversity and composition of the parasite communities of barbel (Barbus barbus) at the infracommunity and component community levels were studied in...

New data on endohelminth communities of barbel Barbus barbus from the Bulgarian part of the River Danube

Published Online: Jul 28, 2018

Page range: 222 - 229

Received: Dec 11, 2017

Accepted: May 15, 2018

DOI: https://doi.org/10.2478/helm-2018-0016

Keywords
helminths, parasite community structure, seasonality, Danube River, Bulgaria

© 2018 M. Chunchukova et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

New data on endohelminth communities of barbel Barbus barbus from the Bulgarian part of the River Danube

Published Online: Jul 28, 2018

Page range: 222 - 229

Received: Dec 11, 2017

Accepted: May 15, 2018

DOI: https://doi.org/10.2478/helm-2018-0016

Keywordshelminths, parasite community structure, seasonality, Danube River, Bulgaria

© 2018 M. Chunchukova et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
helminths, parasite community structure, seasonality, Danube River, Bulgaria