doc. Ing. Josef Hejzlar, CSc.
Senior scientist
Department of Hydrochemistry and Ecosystem Modelling (HEM)
Institute of Hydrobiology
420387775876
hejzlar@hbu.cas.cz
323NB
Limnology of lakes and reservoirs, mainly cycles of nutrients (carbon, nitrogen, phosphorus, sulphur etc.), eutrophication, material transport from the catchment in surface waters and mathematical modelling of hydrodynamics and water quality in water bodies Education: 1980 – Master of Sciences (Ing.) in the field of Water technology at the Institute of Chemical Technology in Prague (MSc. thesis: Residual organic substances in water after purification bt the activation process) 2003 – Associate Professor (doc.) in the field of Hydrobiology at the University of South Bohemia in České Budějovice (Habilitation: Phosphorus cycling in the reservoir ecosystem) Scientific and professional experience: 1984–1990 – research scientist at the Institute of Landscape Ecology of the Czechoslovak Academy of Sciences, department of hydrobiology 1991–1993 – research scientist at the Institute of Hydrobiology of the Academy of Sciences of the Czech Republic (IHB) 1995–today – initially assistant, after habilitation associate professor at the Faculty of Science of the University of South Bohemia in České Budějovice, always part-time 1998–2015, head of the Department of Hydrochemistry and Ecosystem Modelling of IHB 2006–2019 – senior scientist Biology Centre CAS, IHB 2020–today – senior scientist Biology Centre CAS, IHB, part-time as a working pensioner Projects: 1991–2015 – Principal investigator or co-investigator of 12 national projects (Czech Science Foundation, GAAVCR, MSMT-COST, MZe-NAZV) and participation in 2 EU projects focused on modeling the global and local impacts in aquatic and terrestrial ecosystems (EUROHARP, REFRESH) 2015–2017 – Co-investigator of the project "Do long-term zooplankton data in the Slapy reservoir reflect land use and/or climate changes in the past 50 years?" (Czech Science Foundation, principal investigators Jaroslav Vrba and Josef Hejzlar) 2017–2019 – Team member of the project "Fishponds as models for exploring plankton diversity and dynamics of hypertrophic shallow lakes" (Czech Science Foundation, principal investigators Jaroslav Vrba, Jiří Nedoma and Libor Pechar) 2017–2020 – Co-investigator of the project “Floating green islands, a perspective alternative for improvement of ecological potential and support of littoral habitats in water reservoirs” (Technology Agency CR, principal investigators Jan Kubečka, Josef Hejzlar and Milan Hladík) 2018–2022 – Team member of the project "Biomanipulation as a tool for the improvement of reservoir water quality" (Ministry of Education, Youth and Sport CR from support of EU funds, principal investigators Jan Kubečka and Tomáš Jůza) 2021–2024 – Team member of the project “Drinking WAter Readiness for the Future” (Technology Agency CR, EEA and Norway Grants, principal investigator Petr Porcal) 2022–2024 – Team member of the project “Effects of extreme weather events on seasonal dynamics of planktonic assemblages and reservoir water quality” (Czech Science Foundation, principal investigator Petr Znachor) Publications: Web of Science ResearcherID: F-8526-2014, total WoS publications: 127, H-index: 33, Sum of times cited: 3,263 (without self-citations: 2,935)
1985 – Doctor of Philosophy (CSc.) in the field of Chemistry of water and environment at the Institute of Chemical Technology in Prague (Ph.D. thesis: Residual organic substances in water after purification by the activation process) (Ph.D. thesis: Analysis of the high molecular weight fraction of dissolved organic substances produced by activated sludge microorganisms)
1994–2005 – senior scientist at IHB
Cycles of Elements
University of South Bohemia in České Budějovice
Description:
The course is focused on adverse effects of increasing concentrations of nutrients and other ecologically important elements and substances from anthropogenic and natural sources on aquatic ecosystems. The graduates can gain basic knowledge about major sources of water pollutants, their effects on natural element cycling in waters, and possible measures, how to protect aquatic environments from their effects.
Předmět se zabývá vlivy zvyšování koncentrací živin a dalších ekologicky významných prvků a sloučenin pocházejících z antropogenních a přírodních zdrojů na vodní ekosystémy. Absolventi získají přehled o typech znečištění, jejich významu na ovlivňování přirozených koloběhů živin ve vodách a možnostech ochrany vodních ekosystémů před jejich působením.
Ecological management of reservoirs (KBE/471), Element cycles and processes in the catchment (KBE/469), Special limnology (KBE/465)
University of South Bohemia in České Budějovice, Faculty of Science
Description:
The lecture and exercises provide information about water reservoirs, their water management purposes, specific properties in terms of the water ecosystem and water quality, and the methods of their eco-technological management, whereby eco-technologies mean management methods that are close to nature and sustainable.
Přednáška a cvičení podávají informace o vodních nádržích, jejich vodohospodářských účelech, specifických vlastnostech z hlediska vodního ekosystému a jakosti vody a o metodách jejich ekotechnologického řízení, přičemž ekotechnologiemi jsou míněny způsoby řízení přírodě blízké a trvale udržitelné.
Element cycles and processes in the catchment
University of South Bohemia in České Budějovice
Description:
The aim of the lecture is to provide an overview of the basic processes of the cycle of nutrients (C, N, P, S), organic matter (primary production, humic substances) and other elements (Si, Fe, Mn, Al) in the "watershed - reservoir/lake" ecosystem and gain skills in evaluating them.
Cílem přednášky je poskytnout přehled o základních procesech koloběhu živin (C, N, P, S), organické hmoty (primární produkce, humusové látky) a dalších prvků (Si, Fe, Mn, Al) v ekosystému "povodí - nádrž/jezero" a získat dovednosti v jejich hodnocení.
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Total found: 268 records
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Hejzlar J., Potužák J., Míček M.,
Jarošík J.,
Paule-Mercado M.,
Znachor P.,
Porcal P. (2025) Vliv způsobu vypouštění z nádrže Římov za povodně v září 2024 na následnou jakost vodárenského odběru. [The influence of the type of discharge from the Římov reservoir during the flood in September 2024 on the subsequent quality of the water withdrawal.] Sborník konference Vodní nádrže
41–48.
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Haaland S., Hejzlar J., Eikebrokk B., Orderud G.,
Paule-Mercado M.,
Porcal P., Sláma J., Vogt R.D. (2024) Predicting the dissolved natural organic matter (DNOM) concentration and the specific ultraviolet absorption (sUVa) index in a browning central European stream. Ecological Indicators
165 : 112200.
DOI: 10.1016/j.ecolind.2024.112200 |
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Hejzlar J.,
Porcal P.,
Jarošík J.,
Paule-Mercado M., Voght R.D., Haaland S. (2024) Řízení kvality vody v nádržích režimem vypouštění, zkratováním přítoku a selektivním odtokem z různých hloubek. [Control of water quality in reservoirs through discharge mode, short-circuiting of inflow and selective outflow from different depths.] Schválená metodika
1-50.
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Kopáček J., Bače R., Grill S., Hejzlar J.,
Kaňa J.,
Porcal P.,
Turek J. (2024) Dynamics and variability of microclimate in an unmanaged mountain forest after a bark beetle outbreak. Agricultural and Forest Meteorology
344: 109824.
DOI: 10.1016/j.agrformet.2023.109824 |
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Kopáček J., Grill S., Hejzlar J.,
Porcal P.,
Turek J. (2024) Tree dieback and subsequent changes in water quality accelerated the climate-related warming of a central European forest lake. Journal of Water and Climate Change
15: 127.
DOI: 10.2166/wcc.2023.581 |
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Macek M.,
Vrba J., Hejzlar J.,
Řeháková K.,
Jarošík J., Šorf M.,
Šimek K. (2024) Two-decade changes in the ciliate assemblage feeding pattern reflect the reservoir nutrient load. Diversity
16: 534.
DOI: 10.3390/d16090534 |
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Tesfaye M.,
Jůza T.,
Šmejkal M., Hejzlar J.,
Čech M.,
Prchalová M.,
Muška M.,
Tušer M.,
Kočvara L.,
Sajdlová Z.,
Draštík V.,
Říha M.,
Vašek M.,
Blabolil P.,
Symonová R., Brabec M.,
Kubečka J., Souza A.T. (2024) The impact of climatic conditions and food availability on bimodality size structure and density of YOY pikeperch (Sander lucioperca). Hydrobiologia
851: 3665–3681.
DOI: 10.1007/s10750-024-05527-0 |
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Weyhenmeyer G., Chukwuka A.V., Anneville O., Brookes J., Carvalho C.R., Cotner J.B., Grossart H., Hamilton D.P., Hanson P.C., Hejzlar J., Hilt S., Hipsey M., Ibelings B.W., Jacquet S., Kangur K., Kragh T., Lehner B., Lepori F. , Lukubye B., Marce R., McElarney Y.,
Paule-Mercado M., North R., Rojas‐Jimenez K., Rusak J., Sharma S., Scordo F., de Senerpont Domis L.N., Sø J.S., Wood S.A., Xenopoulos M., Zhou Y. (2024) Global lake health in the Anthropocene: Societal implications and treatment strategies. Earth's Future
12: e2023EF004387.
DOI: 10.1029/2023EF004387 |
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Hejzlar J.,
Porcal P.,
Kopáček J.,
Jarošík J.,
Paule-Mercado M. (2023) Předpovědní model DOC v přítoku do VN Římov a ve vodárenském odběru z nádrže. [Forecast model of DOC in the inflow to the Římov water reservoir and in the withdrawal of water from the reservoir.] Sborník konference Vodárenská biologie
45–50.
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Jůza T.,
Blabolil P.,
Čech M.,
Draštík V., Hejzlar J.,
Kočvara L.,
Muška M.,
Peterka J.,
Sajdlová Z.,
Tušer M.,
Vašek M.,
Kubečka J. (2023) Distribution patterns, annual density changes, growth and mortality of pikeperch [Sander lucioperca (L. 1758)] fry following oligotrophication of a reservoir. Ecology of Freshwater Fish
32: 724-734.
DOI: 10.1111/eff.12718 |
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Kopáček J., Bače R., Choma M., Hejzlar J.,
Kaňa J., Oulehle F.,
Porcal P., Svoboda M., Tahovská K. (2023) Carbon and nutrient pools and fluxes in unmanaged mountain Norway spruce forests, and losses after natural tree dieback. Science of the Total Environment
903: 166233.
DOI: 10.1016/j.scitotenv.2023.166233 |
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Orderud G.,
Porcal P., Eikebrokk B., Sláma J., Vogt R.D., Hejzlar J., Haaland S. (2023) The technological development of drinking water treatment plants in the Czech Republic. Water Policy
25: 889.
DOI: 10.2166/wp.2023.102 |
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Tesfaye M., Souza, A.T.,
Soukalová K.,
Šmejkal M., Hejzlar J.,
Prchalová M.,
Říha M.,
Muška M.,
Vašek M.,
Frouzová J.,
Blabolil P.,
Boukal D.,
Kubečka J. (2023) Somatic growth of pikeperch (Stizostedion lucioperca) in relation to variation in temperature and eutrophication in a Central Europe Lake. Fisheries Research
267: 106824.
DOI: 10.1016/j.fishres.2023.106824 |
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Vašek M., Brabec M.,
Blabolil P.,
Čech M.,
Draštík V.,
Jůza T.,
Kubečka J.,
Muška M.,
Peterka J.,
Prchalová M.,
Říha M., Hejzlar J. (2023) Fish scale stable isotopes as potential indicators of nutrient pollution: Exploring the response of roach (Rutilus rutilus) scale δ15N and δ13C to a gradient of land use disturbance. Science of the Total Environment
865: 161198.
DOI: 10.1016/j.scitotenv.2022.161198 |
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Vogt R.D.,
Porcal P., Hejzlar J.,
Paule-Mercado M., Haaland S., Gundersen C.B., Orderud G., Eikebrokk B. (2023) Distinguishing between sources of natural dissolved organic matter (DOM) based on its characteristics. Water
15: 3006.
DOI: 10.3390/w15163006 |
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Vystavna Y.,
Paule-Mercado M.,
Schmidt S., Hejzlar J.,
Porcal P., Matiatos I. (2023) Nutrient dynamics in temperate European catchments of different land use under changing climate. Journal of Hydrology: Regional Studies
45: 101288.
DOI: 10.1016/j.ejrh.2022.101288 |
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Zingel P., Jeppesen E. , Nõges T., Hejzlar J., Tavşanoğlu Ü.N., Papastergiadou E., Scharfenberger U., Agasild H. (2023) Changes in nutrient concentration and water level affect the microbial loop: a 6-month mesocosm experiment. Aquatic Ecology
57: 369-381.
DOI: 10.1007/s10452-023-10015-z |
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Brouček M., Hejzlar J., Říha J., Satrapa L. (2022) Použití vícekriteriálního hodnocení při výběru varianty vodního díla Skalička. [The use of multiple-criteria decision-making analysis when choosing a variant of the Skalička dam.] Sborník konference Vodní nádrže
65–69.
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Fott J., Nedbalová L., Brabec M., Kozáková R.,
Řeháková K., Hejzlar J., Šorf M.,
Vrba J. (2022) Light as a controlling factor of winter phytoplankton in a monomictic reservoir. Limnologica
95: 125995.
DOI: 10.1016/j.limno.2022.125995 |
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Golub M., Thiery W., Marcé R., Pierson D., Vanderkelen I. ......, Hejzlar J. (2022) A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector. Geoscientific Model Development
15: 4597–4623.
DOI: 10.5194/gmd-15-4597-2022 |
