Original title:
Populační struktura a evoluční historie středoevropských zvonků z okruhu Campanula rotundifolia agg.
Translated title:
Population structure and evolutionary history of Central European bellflowers from the Campanula rotundifolia agg.
Authors:
Šemberová, Kristýna Document type: Rigorous theses
Year:
2023
Language:
eng Abstract:
[eng][cze] 6 Abstract For understanding extant species diversity, knowledge about processes acting at the population level is crucial. Besides mutations generating de novo genetic variation, three major processes, i.e., polyploidy, hybridization and local adaptation, notably impact population structure and cause evolutionary novelty. Campanula rotundifolia agg. was chosen as a model group for the joint study of these processes because it represents a polyploid complex with three major cytotypes (2x, 4x, 6x), a hitherto unknown ability to hybridize, and a pleiad of putative species that have undergone local adaptation to different conditions. In particular, polyploidization in the complex is acknowledged for generating morphological variation, facilitating long-distance dispersal and shifts in the environmental niche. It also creates a reproductive barrier, thus enabling sympatric speciation. Prerequisites for local adaptation are morphological variation and strong selection pressures leading to adaptive divergence and the rise of many endemic taxa, mainly at the extremes of environmental gradients. On the other hand, for locally adapted or endemic taxa, hybridization with a widespread taxon is one of the main existential threats. Here, I focused on C. rotundifolia agg. populations in Central Europe its hypothetical...7 Abstrakt zace novinky. Campanula rotundifolia agg.) byl vy studium a . polyploidizace zdroj komplexu a a ved k posunu klady pro i jsou k ke v hybridizace s V C. rotundifolia a alopatrii. a o na a tetraploid , a to jak v mi ami, studovala jsem morfologickou v v by variabilita ve velikosti genomu, v gneice a morfoligii. Vysok variabilita, s m vysok C. rotundifolia m ch ch model ne y rekonstruovanou , jsem porovnala genetickou a morfologickou variabilitu a variabilitu ve velikosti genomu u rostlin z C. rotundifolia s. str. Morfologick podobnost a genetick C. bohemica a C. scheuchzeri z Alp byl C. gelida ve v C. rotundifolia subsp. sudetica. Campanula rotundifolia subsp. sudetica C. rotundifolia s. str. Campanula rotundifolia fenotypovou taxonomy : Campanula rotundifolia agg,
Institution: Charles University Faculties (theses)
(web)
Document availability information: Available in the Charles University Digital Repository. Original record: http://hdl.handle.net/20.500.11956/180340