Karel Horňák, PhD.
Born: 12. 6. 1979 in Městec Králové Contact: Biology Centre of the Academy of Sciences of the Czech Republic, v.v.i., Institute of Hydrobiology, Na Sádkách 7, CZ–370 05 České Budějovice, Czech Republic. Phone: +420 387 775 834 Fax: +420 385 310 248 E-mail: khornak@seznam.cz, hornak@hbu.cas.cz

Education:
PhD studies in Hydrobiology (2006), University of South Bohemia, České Budějovice,
PhD. Thesis: Diversity and functioning of bacterioplankton assemblages in the Římov reservoir, in English.

Master studies in Limnology (2002), University of South Bohemia, České Budějovice,
MSc. Thesis, Influence of protozoan grazing on bacterioplankton community composition, in Czech.

Bachelor studies in Biology (2000), University of South Bohemia, České Budějovice,
Bc. Thesis, Impacts of different size-fractions of plankton on the bacterial community structure studied by fluorescence in situ hybridization, in Czech.

Areas of competence:
fluorescence in situ hybridization, microautoradiography, flow cytometry

International experience in the scope of international projects:
University of Blaise Pascal, Clermont-Ferrand, France.
Royal Netherlands Institute for Sea Research, Den Burg (Texel), The Netherlands.
Max Planck Institute for Marine Microbiology, Bremen, Germany.
Institute of Marine Sciences, Barcelona, Spain.
Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Neuglobsow, Stechlin, Germany.

Relevant publications:
Horňák, K., Mašín, M., Jezbera, J., Bettarel, Y., Nedoma, J., Sime–Ngando, T., Šimek, K. (2005): Effects of decreased resource availability, protozoan grazing and viral impact on a structure of bacterioplankton assemblage in a canyon-shaped reservoir. FEMS Microbiol. Ecol. 52:315–327.

Horňák, K., Jezbera, J., Nedoma, J., Gasol, J. M., Šimek, K. Bacterial leucine incorporation under different levels of resource availability and bacterivory in a freshwater reservoir. (submitted).

Horňák, K., Jezbera, J., Nedoma, J., Šimek, K. Decreased activity of reservoir bacterioplankton during summer cyanobacterial bloom. (under construction).

Šimek, K., Horňák, K., Jezbera, J., Nedoma, J., Vrba, J., Straškrabová, V., Macek, M., Dolan, J. R., Hahn, M. W. (2006) Maximum growth rates and possible life strategies of different bacterioolankton groups in relation to phosphorus availability in a freshwater reservoir. Environ. Microbiol. (in press).

Jezbera, J., Horňák, K., Šimek, K. (2006) Prey selectivity of bacterivorous protists in different size fractions of reservoir water amended with nutrients. Environ. Microbiol. (in press).

Šimek, K., Horňák, K., Jezbera, J., Mašín, M., Nedoma, J., Gasol, J. M., Schauer, M. (2005) Influence of top-down and bottom-up manipulations on the R-BT065 subcluster of -Proteobacteria, an abundant group in bacterioplankton of a freshwater reservoir. Appl. Environ. Microbiol. 71:2381-2390.

Jezbera, J., Horňák, K., Šimek, K. (2005) Food selection by bacterivorous protists: insight from the analysis of the food vacuole content by means of fluorescence in situ hybridization. FEMS Microbiol. Ecol. 52:351-363.

Šimek, K., Jezbera, J., Horňák, K., Vrba, J., Seďa, J. (2004) Role of diatom-attached choanoflagellates of the genus Salpingoeca as pelagic bacterivores. Aquat. Microb. Ecol. 36:257-269.

Šimek, K., Horňák, K., Mašín, M., Christaki, U., Weinbauer, M. G., Dolan, J. R. (2003) Comparing
the effects of resource enrichment and grazing on a bacterioplankton community of a meso-eutrophic reservoir. Aquat. Microb. Ecol. 31:123-135.

Bettarel, Y., Dolan, J. R., Horňák, K., Lemeé, R., Mašín, M., Pedrotti, M. L., Rochelle-Newall, E., Šimek, K., Sime-Ngando, T. (2002) Strong, weak, and missing links in a microbial community of the N.W. Mediterranean Sea. FEMS Microbiol. Ecol. 42:451-462.

Šimek, K., Pernthaler, J., Weinbauer, M. G., Horňák, K., Dolan, J. R., Nedoma, J., Mašín, M., Amann, R. (2001) Changes in bacterial community composition, dynamics, and viral mortality rates associated with enhanced flagellate grazing in a mesoeutrophic reservoir. Appl. Environ. Microb. 67:2723-2733.

International conferences:
XXIX. SIL Congress, August 8 – 14, 2004, Lahti, Finland: Impacts of resource availability and predation on the community composition and proportion of active bacteria in a canyon-shaped reservoir, Horňák, K., Jezbera, J., Mašín, M., Nedoma, J., Šimek, K. (poster).

ASLO Summer Meeting, June 19 – 24, 2005, Santiago de Compostela, Spain: Uptake of leucine by major phylogenetic groups of bacteria under different levels of resource availability and bacterivory in a canyon-shaped reservoir, Horňák, K., Jezbera, J., Nedoma, J., Šimek, K. (lecture).

Czech conferences:
18th Seminar on Topical Issues of Water Supply Biology, February 6 – 7, 2002, Praha, Czech Republic: Využití genetických sond při studiu bakterioplanktonu vodárenské nádrže Římov, Horňák, K., Mašín, M., Nedoma, J., Šimek, K. (lecture).

13th Conference of Slovak Limnological Society and Czech Limnological Society, June 23 – 27, 2003, Banská Štiavnica, Slovakia: Effects of nutrients and protozoan grazing on community composition of bacteria transferred from a nutrient-rich to nutrient-poor area of a dam reservoir, Horňák, K., Mašín, M., Jezbera, J., Nedoma, J., Šimek, K. (lecture).

Grant:
Horňák, K.: Composition of bacterioplankton assemblage studied by means of fluorescence in situ hybridization and microautoradiography (2004), funded by the Ministry of Education, Youth and Sport of the Czech Republic, (FRVŠ 1062/2004).

Hobbies:
Piano, MTB