|
|
Limit factors for survival of Unionoidea in the freshwater hyporeal with a focus on Margaritifera margaritifera
Macháček, Vojtěch ; Horáčková, Jitka (advisor) ; Barák, Vojtěch (referee)
This bachelor thesis deals with physical, mechanical, chemical and biological factors that limit the occurrence, survival and reproduction of large bivalve molluscs of the Unionoidea superfamily. Accent is placed on freshwater pearl mussel (Margaritifera margaritifera) for which a rescue action plan is being implemented in the Czech Republic, as it is one of the most endangered bivalve mollusc in our country and in Europe. In addition to the already thoroughly explored factors as - water temperature, conductivity, river dynamics, river bed structure, pH, concentration of various forms of nitrogen, phosphorus and oxygen, and the interaction of large bivalve molluscs with other animals, I deal with relatively new issues of pesticides and pharmaceuticals. These are appearing in the streams due to human (in)activity, and we know almost nothing about their impact on large freshwater bivalve molluscs. I also deal in more detail with the issue of calcium, which is essential for bivalve molluscs, because they make their shells out of it, although it is not yet clear which form they accept.
|
|
|
Limit factors for survival of Unionoidea in the freshwater hyporeal with a focus on Margaritifera margaritifera
Macháček, Vojtěch ; Horáčková, Jitka (advisor) ; Barák, Vojtěch (referee)
This bachelor thesis deals with physical, mechanical, chemical and biological factors that limit the occurrence, survival and reproduction of large bivalve molluscs of the Unionoidea superfamily. Accent is placed on freshwater pearl mussel (Margaritifera margaritifera) for which a rescue action plan is being implemented in the Czech Republic, as it is one of the most endangered bivalve mollusc in our country and in Europe. In addition to the already thoroughly explored factors as - water temperature, conductivity, river dynamics, river bed structure, pH, concentration of various forms of nitrogen, phosphorus and oxygen, and the interaction of large bivalve molluscs with other animals, I deal with relatively new issues of pesticides and pharmaceuticals. These are appearing in the streams due to human (in)activity, and we know almost nothing about their impact on large freshwater bivalve molluscs. I also deal in more detail with the issue of calcium, which is essential for bivalve molluscs, because they make their shells out of it, although it is not yet clear which form they accept.
|
guest ::
