Many marine colonial invertebrates host bacterial symbionts. They were also described in several bryozoan species, but details of their interaction with host tissues studied very fragmentarily. Ultrastructural research on two closely related cheilostome bryozoans – Aquiloniella scabra and Paralicornia sinuosa have revealed the presence of symbiotic bacteria inside so-called ‘funicular bodies’, that are swollen parts of funicular strands providing transport function within and between zooids. Funicular bodies are morphologically similar in both species. The size of the bodies correlates with the number of symbionts inside of them. Presence of the electron dense matrix in the gaps between symbionts and cytoplasmic processes of the host cells, as well as an increase of the funicular bodies in size, may indicate trophic relationships between the bryozoan tissues and bacteria. Thus, funicular bodies can serve as a reservoir for the maintenance of the vital activity of bacteria and their multiplication. Viral particles were detected in the cytoplasm of bacterial symbionts of P. sinuosa. Presence of viruses in bryozoans has not yet been detected. Amount of bacteriophages differs in the bacteria from different funicular bodies. We found intact bacterial cells, cells with virions in the cytoplasm and disrupted bacteria containing virions. Differences can be associated with the asynchronous occurrence of the lytic cycle in bacteria from different funicular bodies. Interestingly, viral particles possess a larger and more complex capsid then those of most bacteriophages known.
Translated title of the contributionБактериофаги как часть симбиотической системы мшанок и их бактериальных симбионтов
Original languageEnglish
Title of host publication18th International Bryozoology Association conference
Subtitle of host publicationAbstract volume
PublisherInternational Bryozoology Association
Publication statusPublished - Jun 2019
Event18th International Bryozoology Association conference - The Technical University of Liberec (TUL) in Czech Republic, Либерец
Duration: 16 Jun 201922 Jun 2019


Conference18th International Bryozoology Association conference
Abbreviated titleThe 18th IBA Conference
CountryCzech Republic
Internet address

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