Viruses are the most abundant biological entities on Earth and can be found in a variety of environments. A high prevalence of viruses in marine and freshwater systems was initially reported by Spencer in 1955, but the ecological significance of viruses is insufficiently known even until the present day. Viruses are known to play a key role in the biology of freshwater bacteria: controlling the bacterial abundance, composition of species, and acting as intermediaries in the transfer of genes between bacterial populations. In our study a variety of viromes of the Ile-Balkhash water basin were identified. It was found that the composition of viruses of the Ile-Balkhash region is made up not only of a wide variety of autochthonous viruses typical for phytoplankton hydro ecosystems, but also of representatives of allochthonous viruses—such families as Coronaviridae, Reoviridae and Herpesviridae—indicating anthropogenic pollution of the basin. The research designed to investigate the viral abundance, spread, infectious cycle, seasonal dynamics, composition of the viral community, and the influence of viruses on the bacteria, phytoplankton and recycling of nutrients, as well as the impact of environmental factors on the viral ecology in a variety of marine and freshwater systems is very relevant nowadays.
Bacteriophage Metagenomics Viromes Biodiversity Water ecosystems
This is a preview of subscription content, log in to check access.
This work was supported by Grant 0115PK01095 from the Ministry of Education and Science of the Republic of Kazakhstan. The authors thank the “Genotek” company’s employees for help with the sequencing of the obtained samples.
Noble RT, Middelboe M, Fuhrman JA. The effects of viral enrichment on the mortality and growth of heterotrophic bacterioplankton. Aquat Microb Ecol. 1999;18:1–13.CrossRefGoogle Scholar
Bratbak G, Heldal M. Viruses rule the waves—the smallest and most abundant members of marine ecosystems. Microbiol Today. 2000;27:171–3.Google Scholar
Frede T. Thingstad elements of a theory for the mechanisms controlling abundance, diversity, and biogeochemical role of lytic bacterial viruses in aquatic systems. Limnol Oceanogr. 2000;45(6):1320–8.CrossRefGoogle Scholar
Hewson I, Barbosa JG, Brown JM. Temporal dynamics and decay of putatively allochthonous and autochthonous viral genotypes in contrasting freshwater lakes. Appl Environ Microbiol. 2012;78(18):6583–91.CrossRefPubMedPubMedCentralGoogle Scholar
Montanié H, et al. Potential effect of freshwater virus on the structure and activity of bacterial communities in the Marennes-Oléron Bay (France). Microb Ecol Febr. 2009;57(2):295–306.CrossRefGoogle Scholar
Promoting IWRM and fostering transboundary dialogue in central asia. Report. 2010.Google Scholar