|
| |
|
| |
|
|
Biogeography and phenotypic plasticity in silica-scaled chrysophytes (Synurophyceae)
Škaloudová, Magda ; Němcová, Yvonne (advisor) ; Komárková, Jaroslava (referee) ; Kamenik, Christian (referee)
CONLUSIONS Results of the Papers 1 and 2 summarizing Mallomonas distribution rather support the"moderate endemicity model" of Foissner. The most of Mallomonas species were cosmopolitan or widely distributed, but we also found several species with geographically restricted occurrence contradicting the "ubiquity model". Besides two Asian endemics there are three Mallomonas species (M. multiunca, M. oviformis, and M. punctifera var. punctifera) not conforming to ubiquity model due to their highly nonrandom distribution in subtropic to subarctic zones of the Northern Hemisphere. Several others examples of Mallomonas species with restricted distribution are given in literature. Mallomonas kalinae was isolated and described from a peaty pool in North Bohemia (Paper 3). This strain together with the Synura curtispina strain was used for investigation of scale and bristle plasticity under different temperatures (Paper 4). Changes in morphology of silicate structures in relation to temperature were significant, although the large part of variability was caused by different position on the cell. Bristles become significantly shorter with increasing temperature. An inverse relationship between size of scales and temperature corresponding to the temperature-size rule was found. The main scale characters were stable...
|
|
|
Chrysophycean cysts and scales in paleolimnological studies
Bartošová, Kateřina ; Němcová, Yvonne (advisor) ; Škaloudová, Magda (referee)
This thesis deals with chrysophyte scales and stomatocysts as useful tool of paleoecological reconstructions in lake ecosystems. In the first part the geological physical and biological aspects of lake reconstructions are described. The second part contents information about chrysophyte taxa and their utilisation as paleoekological indicators. Chrysophyte microphosils include two major groups of siliceous indicator: stomatocysts and sculptured and ornamented species-specific scales. Using surface-sediment training sets, quantitative inference models have been constructed for eutrophication, acidification, air-born pollution, salinification, climatic change, and other environmental changes. This thesis represents a literature review.
|
|
| |
guest ::
