|
|
The food of pikeperch (Sander lucioperca) fry in ponds with different kinds of management
URBÁNEK, Marek
The aim of this study was a comphensive assessment of the food of pikeperch fry in the monoculture rearing from the stage of summer fry to the stage of autumn fry in ponds with three different types of management and assessment of the influence of individual treatments for pikeperch production. The experiment was performed in small ponds in experimental facility of FFPW in Vodňany. The variants of pond treatment were: a) ponds with additional prey fish (fry of common carp (C. carpio) and grass carp (C. idella)), b) ponds with installed substrate from heather, c) control variant without any support of natural food of pikeperch. All treatments had four repetitions. Rearing of pikeperch fry lasted 97 days. In all treatments, the opportunistic food strategy of pikeperch fry was recorded during the whole period of rearing and the main recorded food was macrozoobenthos, especially insect larvae. Bigger species of zooplankton had also been often found in the stomachs of pikeperch. Considerable development of macrozoobenthos in all experimental ponds was probably caused by the presence of submerged macrophytes. Thus, this factor made harder to estimate influence of installed substrates from heather for production of pikeperch fry and composition of its food. In the treatment with prey fish, the total length (F (9. 450) = 91.1; p < 10-3) and weight (F (9. 450) = 61.9; p < 10-3) of pikeperch fry were for the whole period of rearing significantly higher in comparison to the other treatments. In addition, the survival of pikeperch in the treatment with prey fish reached to 56 - 92,4 % at the end of rearing. In the treatment with substrate from heather, the total length and weight of pikeperch was significantly higher in comparison to the control treatment only in the first term of sampling. In the rest of pikeperch fry rearing period were the values comparable or higher in control treatment. Thus, for the rearing of pikeperch from the stage of summer fry to the stage of autumn fry is appropriate to stock prey fish in ponds. In comparison to installation of artificial substrate, the diversity of water environment, which is subsequently able to provide sufficiently wide natural food for reared pikeperch, seems to be more decisive.
|
|
|
Bioaccumulation of heavy metals in macroinvertebrates: relationship between concentrations and organism size
Hanzlíková, Lenka ; Dočkalová, Kateřina (advisor) ; Hořická, Zuzana (referee)
The size of benthic organisms is one of many possible factors affecting resultant concentrations of metals accumulated in organisms from surrounding water environment. Partial information is presented in research publications which state this dependency with different conclusions. So far the dependence was not unequivocally interpreted. Relationship between concentration and body size may differ among various metals and also between individual species of macroinvertebrates. This bachelor thesis is a research of professional literature and its result is analysis of existing knowledge of types of this dependancy and comparison of individual representatives of aquatic invertebrates and individual metals. Significance of the trend of dependence as a factor having the influence on the final interpretation of data on the concentrations of monitored substances, especially heavy metals is to be assessed. Result of this work should facilitate the interpretation of data for future analysis of heavymetals in aquatic invertebrate organisms. Keywords: bioaccumulation, heavy metals, macroinvertebrates
|
|
|
Vliv kořenové čistírny na makrozoobentos recipientu
Sokolová roz. Jeřábková, Helena
This diploma thesis elaborates on the influence of constructed wetlands on macrozoobenthos of the respective recipients. Constructed wetlands near the town of Hostětín were chosen for this research project, as well as its recipient Kolelač river delta where cleaned water is drained into. The report also contains analysis of Kolelač's stream area which took place during April 2013 under the auspices of the TA02020128 project by T.G.Masaryk Water Research Institute Brno. Investigation was performed in five sites labeled L1-L5. Of these, L3 was placed in the vicinity below the outfall of constructed wetlands. The research involved a one-time collection of quantitative and qualitative samples of macrozoobenthos by the so called PERLA method. Different characteristics for each facility were analyzed in order to carry out a comprehensive survey. This included for example: abundance, amount of taxons; diversity; taxonomic composition of microzoobenthos; as well as other ecological factors of Kolelač stream quality affected by the constructed wetlands. Macrozoobenthos' studied using abiotic factors demonstrate that the L3 drainage area in closest proximity to constructed wetlands is more polluted than other locations. Analysis by a multi-metric index ranked L3 into the 3rd group, indicating that a medium ecological water quality was present, whereas other locations are ranked into the 5th group with the highest ecological quality of water.
|
|
|
Species diverzity of macroinvertebrates of selected streams on the right bank of Lipno.
VLÁŠEK, Ondřej
In my diploma thesis I reviewed the results of the collection of makrozoobentos and water chemistry on three streams, which are located on the right bank of the Lipno dam. This is a Bukový, Horský and Mlýnský stream. On these streams I watch a chemical properties of conductivity, pH and alkalinity. Of the biological i wathc diversity of each group of makrozoobentos and their abundance. I then compared the results with the values from the previous years, and assessed the gradual development of these aquatic communities.
|
|
|
Rychlost kolonizace nově vybudovaných rybníků makrozoobentosem
Petrovajová, Veronika
Presented diploma thesis deals with the topic of colonisation of newly build fishponds by macrozoobenthos organisms. Most of the authors devote to colonisation of running or periodic waters but colonisation of standing waters is more likely neglected topic. Observed locality is placed in the Northern Moravia. Three fishponds in the newly created pond system were sampled from spring till autumn during the first year after building. Qualitative samples of aquatic biota were taken by hand-net. Macrozoobenthos of fishponds was evaluated from the taxonomic structure and abundance point of view. Due to the high proportional representation of Chironomids and a lack of autecological demands of particular taxa, distribution of organism into particular functional groups was not realized. The influence of fish stock as well as short time period from the pond creation were assessed as the main factors of low taxonomic composition and low abundance of macrozoobenthos. Simultaneously, the physicochemical parameters (temperature, dissolved oxygen, pH and conductivity) of water of fish ponds were monitored. Those were assessed as suitable for stated fishponds types and should not eliminate neither the rearing of fish nor the presence of aquatic invertebrates.
|
|
|
Makrozoobentos řeky Svratky -- změny složení společenstva makrozoobentosu v podélném profilu
Kadeřábek, Petr
This thesis deals with the observation of a change of macroinvertebrate in the longitudinal profile of the river Svratka. The monitoring of macroinvertebrate was accomplished at se-ven locations of the Svratka river during the july of 2012. Samples were collected from various locations by the workers of Mendel university and subsequently processed and determined in the university laboratory by the author of the thesis. The diversity of species and thein abundance were evaluated. On these seven sites were found a total of eleven groups of macroinvertebrate, with the largest groups of Ephemeroptera, Coleoptera, Dipte-ra and Trichoptera The taxonomic composition and abundance were evaluated from the obtained data. Both factors were changing towards the flow of the river. Taxonomic com-position got richer and abundance got slightly increased. The taxonomic composition of macroinvertebrates was changing in the longitudinal profile of the river. The examined stretch of the river Svratka is relatively stable, no significant changes were noted.
|
|
|
Effect of ponds and pond systems on the composition of the benthos in horní Lužnice
SVAČINA, Petr
The work is focused on monitoring changes in benthic communities in the longitudinal gradient of the river Lužnice. The river flows through to the pond area Třeboňsko and the largest pond of the Czech Republic - Rožmberk. It is examine affect of pond on benthic communities. The work involves collecting benthos according to the PERLA method on four profile in four seasons, the analysis of chemical parameters and data processing. The values of SI (saprobiological index) in the longitudinal gradient were from SI 1.8 to SI 2.6. SI values were at the outflow of Rožmberk higher than at inflow. The lowest values were in the first profile Suchdol (SI 1,8 ? SI 2,1) and higher values were in the last profile Vlkov (SI 2,4 ? 2,6). The chemical parameters at outflow were observed increased values of BOD5, TOC, NL105, NL505, chlorophyll and total P but lower values of nitrogen forms (Ntotal,NH4, N-NO3-). On the each profile was the significant change in the incidence or absence of certain groups. Profiles Suchdol and Hlína were diferent than Lužnice and Vlkov especially in the presence of stoneflies, dragonflies, beetles, and individuals generally indicates good water quality. Profiles at outflows from Rožmberk (Lužnice and Vlkov) showed a continued presence of bloodsuckers and more species indicating high organic pollution. NMDS method confirmed impact of sites in communities rather than period (R2 = 0.6 at significance level of p = 0.001).
|
|
|
Evaluation of quality and the renewal of surface water in the area affected by surface coal mining.
VLÁŠEK, Ondřej
The aim of the study was to evaluate the parameters of quality and renewal of surface water in the area affected by surface brown-coal mining. Selected streams were monitored on the Great pokrusnohorska dump, and streams unaffected by dumps. Values of pH, conductivity, alkalinity, oxygen saturation and temperature were measured, and quantitative and qualitative samples of macrozoobethos were taken too. The dump?s water are characterized by high concentrations of dissolved solids and alkalinity. Species diverzity of these waters is lower and is affected not only by chemical compositon of the water, but also by the character of the bottom substrate.
|
|
|
Seasonal changes in macrozoobenthos of the Brno reservoir during water level manipulation
OPATŘIL, Jan
There is a number of measures, which have been currently performed on the Brno Reservoir, with the aim at the recovery of the environment health and at the reduction of incidence of cyanobacterial water blooms. The main intervention in this efforts was the desrease of water level in 2009-2010, when the level was reduced by up to 9 m. This intervention resulted in drying of the uncovered area of the littoral bottom and in completely changed oxygen conditions in the remaining lake. The objective of my work is to evaluate changes in benthic macroinvertebrate assemblage in response to these interventions and measures. On the sites of the reservoir, selected with respect to water levels and in-depth ratios, macroinvertebrates were seasonally sampled by the Ekman grab and kick-off approach in deep muddy sites and in the littoral zone, resepctively. Samples were collected at the ?Hráz?, ?Střed?, ?Litorál?, ?Rakovec?, ?Zouvalka?, ?Rokle? and ?Horní vzdutí?. In parallel with sampling selected environmental parameters (temperature, O2) in epilimnium hypolimnium were measured. The samples were washed and conserved for later determination and quantification in the laboratory. All macroinvertebrate samples were divided into three groups: Chironomidae, Oligochaeta and Others. The result are presented in a graphical form as the biomass and density on different sites according to the years preceding the reservoir draining, during the water level decline and afterwards and discussed in association with certain abiotic factors.
|
|
|
Species variability of bentic organisms in Dračice river classicifed by PERLA system
KOUTNIK, Dalibor
Examination ecological size selected part of river (from village Františkov to border with Austria) on the basis of field watching. Observed results are analysed by system PERLA. Method is based on analysing biodiversity makrozoobenthos sample from fordables running water. Sampling can be apply in running water, where water column not exceed 1 m and speed of water stream to 1 m/s. Taking is made by normal or low water stage.
|
guest ::
