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Hydrobiologie (Subject) / UBRM (Lesson)
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- What salinity do inland waters have? 0,01 – 1 ‰
- How is the light-flooded layer in lakes called? Euphotic- or trophogenic layer
- The low heat conductance of water favors… Thermal storage in the waterbody and temperature layering
- Which type of plants cannot be found in alpine streams? Plants (macrophytes) with floating leaves, Periphytons (attached algae)
- Which plant-type is typical for oligotophic alpine streams? Fontinalis antipyretica / Common water moss
- How does Zooplankton swim? With vacuoles filled with oil
- On the compensation level are… Assimilation/production and dissimilation/degratation is balanced
- How are lake marl-benches formed? CO2 withdraws and Ca(CO3) accumulation
- Where do chalk banks form? In lake littoral zones through “biogenic decalcificaion“
- Flooded Au-grassland (wetland) resemble… The Potamal (or flat moors)
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- Who practices Parthenogenesis (form of asexual reproduction)? Rotifers (Rotatoria) and Water fleas (Cladocera)
- What is a biofilm? A biofilm is any group of microorganisms (bacterium, algae/seaweeds,…) in which cells stick to each other on a surface
- Which 2 facts are important for critical loading? Retention time and average depth
- How does the O2 content act in the rivers of the Potamal (lower reaches of a river)? In form of an amplitude by day and decrease by night
- What is Pt (phosphorus) based on? Inorganic, dissolved, organic dissolved and organic phophate particles
- How can thermocline be distinguished? Metalimnion , border between epilimnion and Hypolinion , the area of highest Temp.change (decrease) with increasing depth
- Where can you find the most phytoplankton? In natural waterbodies in the Pelagial, in standing waters, in the Potamal, in lakes with few fish
- Which plant is located in the pelagic zone? (Phytoplankton) Plants with floating leaves, Periphyton = attached algae
- What belongs to biodiversity? Habitat diversity, species diversity, genetic diversity
- What is similar to flooded Au-wiesen (wetlands)? The Potamal or flat moors
- What is typical for O2 in running waters/rivers during the day? In the rhithral they are always saturated with oxygen, in the Potamal, there are high values (amplitudes) during the day and low numbers at night
- Which measures protect eutrophication/restoration in a lake? Extraction of the hypolimnion with the so-called Olschewski-pipe. usually causes only mild reoligotrophication or condition stabilization.
- How do you call the region in lakes, where no light can get in? Profundal
- Which components are significantly developed in the metalimnion? temperature and density (greatest temperature change (decrease) occurs with the depth increase (thermocline). the depth of wind circulation effect decreases as the surface temperature increases, along with a surface density gradience increase)
- Which type of plants (photoautotrophic organisms) absorb lots of CO2? Fontinalis type
- What are extreme biotopes? Few species but each has a high density
- Which type of diet do muddenizen have (Schlammbankbewohner)? Filter feeders, predators or detritus? Detritus eater
- The anomalous density of the water leads to…? deep waterbody of 4 degrees
- What are Planctic organisms are distinctive of? Free swimming or floating in the water (depending on temperature and density of the water)
- How high is the load of phosphorus in oligotrophic lakes? smaller than 10 mg Pt/m^3