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Fig. 2: Standardized characteristic downstream succession of plankton communities based on the relative distance model and rounded relative distance positions (RDP) of percentage of bacterial, HNF, ciliates and zooplankton abundances, bacterial biomass and production, total protozoan bacterivory and chlorophyll a concentrations evaluated in eight longitudinal transects. Note that percentage values plotted against 9 RDPs, i.e. 0.1, 0.2 ..... 0.9, give a sum of 100% over the longitudinal transect. The values are means and the grey filled areas show ±1SD. 22
in spring and summer periods, mainly during events of river water overflow when a large proportion of the river was directly mixed into the epilimnion. Thus, the relative input of river water is suggested to be a useful predictor of the amplitude of the development of the epilimnetic microbial food webs in highly nutrient loaded canyon-shape reservoirs [1]. These results may have important implications in the context of global change in Mediterranean regions, where expected reductions in runoff may profoundly affect river water circulation patterns in reservoirs and hence organic carbon cycling in these ecosystems. Cited reference supported by the ongoing project 206/08/0015: [1] Šimek K, Comerma M, García JC, Nedoma J, Marcé R, Armengol J. 2011: The effect of river water circulation on the distribution and functioning of reservoir microbial communities as determined by a relative distance approach. Ecosystems 14: 1–14. 3.5 Horizontal acoustic surveys and fish behaviour in the open water (completed project) Grant Agency of the Czech Republic, 2007–2010 project No. 206/07/1392. Principal investigator: J. Kubečka (kubecka@hbu.cas.cz). Cooperation: H. Balk (University of Oslo, Norway), G. Rakowitz (University of Vienna, Austria), M. Prchalová, J. Frouzová, M. Čech, V. Draštík, T. Jůza, M. Kratochvíl, J. Peterka, M. Říha, M. Tušer, and M. Vašek (Institute of Hydrobiology BC AS CR, České Budějovice). The project was broadly aimed at overcoming the basic problems of quantitative studies of fish in the open water of the reservoirs. Open water represents the largest volume of reservoirs. At the start of the project the scientific community lacked reliable information on quantity, species and age distribution of fish in the open water of European reservoirs. Most data available were from passive gillnet sampling with unknown selectivity or from semiquantitative echosounder results. Methods for studying pelagic fry communities were completed during the project and used in a number of reservoirs. A two-dimensional predictive model of cyprinid and percid fry occurrence in the Římov Reservoir was elaborated with respect to its longitudinal dimension and depth (Jůza et al., 2009). Even greater progress was achieved with larger (mostly adult) fish. The first holistic models of fish occurrence in Želivka and Římov Reservoirs were developed on the basis of gillnet sampling (Prchalová et al., 2008 and 2009). Hydroacoustic and trawling methods were further developed for the sampling of the open water adult fish community and possible shortcomings were critically analysed (Rakowitz et al., submitted). Quality assurance of information on reservoir fish was often missing in the past and this project has contributed substantially to achieving and assuring the quality. In adition to the methodological advances made, the project has facilitated several studies of open water fish behaviour (Jarolím et al. 2010). 11 publications were printed and seven more submitted in journals covered by Thomson’s Web of Knowledge (WOK), three of the latter had been accepted accepted by the report deadline. 5 more publications not covered by WOK were published. Three PhD and three MSc. theses have been completed and four PhD and two MSc. Theses were in progress by the report deadline. Two worldwide conferences summarizing the state-of-the-art in the sampling of lakes and reservoirs, each with over 100 participants from over 30 countries, were organized by the project team (Kubečka et al. 2009). The second one of these, Fish sampling with active methods, was held in September 2010 in České Budějovice (http://fsam2010.wz.cz). 23
Page 1 and 2: ACADEMY OF SCIENCES OF THE CZECH RE
Page 3 and 4: CONTENTS THE INSTITUTE, SCIENTIFIC
Page 5 and 6: Academy of Sciences of the Czech Re
Page 7 and 8: RNDr. Dagmar Sirová (maternity lea
Page 9 and 10: 1 INTRODUCTION 1.1 Directors’ pre
Page 11 and 12: 2008-2012 Reg. code 206/08/0015, Ec
Page 13 and 14: EQUIPPMET Income Reserve for invest
Page 15 and 16: 2 JAROSLAV HRBÁČEK (1921-2010) He
Page 17 and 18: 3 RESERVOIRS 3.1 Regular monitoring
Page 19 and 20: 3.3 Regular monitoring: fish stock
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Page 25 and 26: 3.7 Deep spawning of perch Perca fl
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Page 29 and 30: 4 LAKES 4.1 Microbial loop componen
Page 31 and 32: 5 SPECIAL INVESTIGATIONS 5.1 Effect
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