|
|
Vertical migration of benthic cyanobacteria and algae
Mensa, Jakub ; Neustupa, Jiří (advisor) ; Němcová, Yvonne (referee)
Vertical migration has been observed in different taxonomic groups of benthic microalgae and cyanobacteria in both marine and freshwater habitats. It seems to be an advantageous survival strategy of motile photoautotrophic organisms. In general, algae inhabiting tidal environments migrate up to the sediment surface during daytime emersion and then migrate below the surface prior to high tide or dusk. Freshwater microalgae stay on the surface during daytime and migrate below the surface before dusk. The migratory rhythm can be controlled or influenced by light, waves, subsurface nutrient supplies and reducing conditions in the sediment. Sometimes, the rhythm persists even in constant conditions and it seems to be controlled by biological clock system.
|
|
|
Vertical migration of benthic cyanobacteria and algae
Mensa, Jakub ; Neustupa, Jiří (advisor) ; Němcová, Yvonne (referee)
Vertical migration has been observed in different taxonomic groups of benthic microalgae and cyanobacteria in both marine and freshwater habitats. It seems to be an advantageous survival strategy of motile photoautotrophic organisms. In general, algae inhabiting tidal environments migrate up to the sediment surface during daytime emersion and then migrate below the surface prior to high tide or dusk. Freshwater microalgae stay on the surface during daytime and migrate below the surface before dusk. The migratory rhythm can be controlled or influenced by light, waves, subsurface nutrient supplies and reducing conditions in the sediment. Sometimes, the rhythm persists even in constant conditions and it seems to be controlled by biological clock system.
|
|
|
Revitalization and biodiversity recovery of peat bogs: a case study of the Babín pools
Bestová, Helena ; Šťastný, Jan (referee) ; Škaloud, Pavel (advisor)
This work deals with the issue of the revitalization of harvested peat lands. Peat lands dominated by bryophyte Sphagnum do not readily return to their natural stages. In the theoretical part I conclude a) experience with restoring the hydrological regime and b) successes in revegetation by typical peat land vegetation, which is the essential pre-requisite for developing functional peat land ecosystem. The practical part is focused on my own research of diversity and ecology of algaes at cut-away and later restored peat land Babín in the vicinity of Žďár nad Sázavou. These samples of phytobenthos were collected over a tre year span from 2007 to 2009. I have examined the diversity of these samples by optical microscope, using the data I collected about species abundance for multidimensional statistical analysis.
|
|
| |
|
| |
|
| |
|
| |
|
| |
guest ::
