Mandak, Bohumil , Hadincova, Veroslava , Mahelka, Vaclav , Wildova, Radka .
How does genetic variation change during biological invasion? A study of Pinus strobus.
Many alien species show a substantial time lag between initial establishment and the appearance of strong ecological impacts. Time lags can exist for both ecological and evolutionary reasons. Basically two scenarios could be taken into account. Firstly, a time lag can result simply from the fact that a new alien species requires time to disperse into favourable habitat patches throughout the region and to build up populations capable of producing abundant offspring. Secondly, an initial population may lack evolutionary adaptations that permit explosive population growth. After some period, through genetic reorganization within a population, an evolutionary breakthrough may occur, enabling the alien to become an invasive species. We have tested abovementioned hypothesis using North American tree Pinus strobus invasive in the Czech Republic. We have tested the differences in population genetic composition between native and introduced populations and compared genetic diversity among invasive and non-invasive populations within the Czech Republic. The European populations of Pinus strobus are more likely to be derived from several regions in the native range. Further analysis of population structure indicate that intraspecific hybridization among genotypes from geographically distinct regions of the native distribution range occurred following colonization in the Czech Republic.
Our research is focused on biology of invasive species, specifically we are interested in evolution of invasive species outside of their native range.
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1 - Institute of Botany, Zamek 1, Pruhonice, CZ-25243, Czech Republic
Presentation Type: Oral Paper:Papers for Topics
Location: 556A/Convention Center
Date: Tuesday, August 3rd, 2010
Time: 8:15 AM