Description: Niche-based models (NBMs) are increasingly used to predict the geographical extent of invasion of alien species using empirical statistical correlations describing the presence of a species as a function of environmental variables. The classic approach is to calibrate the model in the native species range and to project the model in the new invaded range to predict suitable areas for the establishment of the species, assuming that ecological requirement of the species is conserved. However, recent studies demonstrated that climatic niche shifts can occur in the invaded range enabling some species to invade new and unpredictable habitats. While NBMs are useful tools to predict areas of introduction, they may fail to predict the full extent of species invasions. NBM approaches usually treats invasive species as homogeneous and immutable entities. However, recent studies in evolutionary biology have shown that invasive species in the new range could experience hybridization, evolution of increased competitive ability or new phenotypic adaptations as a result of the absence of natural enemies. It is thus imperative to move beyond treating invasive species as genetic black boxes in mitigation and management strategies. During this post doc, I will analyze the distribution of Spotted Knapweed (Centaurea maculosa) at the genetic lineage level using jointly niche-based models and population phylogeny approaches. 75 native and 37 introduced populations sequenced for 2 cpDNA markers will be investigated to identify sources of introduction and cryptic boundaries, such as breaks in the gene flow across populations, or secondary contact among previously isolated populations. The relationship between genetic architecture and ecological factors which determine the success of invasion processes will ultimately be used to trace back invasion routes of Spotted Knapweed in North America.
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Tags: Gelöster organischer Kohlenstoff ? Biopharmazeutikum ? Genetik ? Ökologie ? Ökologische Nische ? Tracer ? Invasive Arten ? Biologie ? Habitat ? Gebietsfremde Art ? Neophyt ? Architektur ? Geographie ? Management ? Studie ? Phylogenese ? Modellierung ? Amerika ? Bevölkerung ? Ökologischer Faktor ? Umwelt ? Gebiet ? Strategische Aspekte ? Evolution ? Einheimische Art ? VERTEILUNG ? BEWEGLICH ? BEWEGT ? BRUCH ? Bepflanzung ? EINFUEHRUNG ? ERFORDERNIS ? ERGEBNIS ? EVOLUTIONAER ? FUNKTION ? Fluss [Bewegung] ? GRENZE ? Gen ? Hybridisierung ? KLASSISCH ? Kalibrierung ? MOEGLICHKEIT ? NEU ? NOERDLICH ? PROJEKT ? SPAREN ? STATISTISCH ? Sequenzierung ? VERARBEITEN ? Art [Spezies] ? Vermehrung ? Werkzeug ?
License: Creative Commons Namensnennung-keine Bearbeitung-Nichtkommerziell 4.0
Language: Englisch/English
Last harvest: 14.07.2026 00:04
Time ranges: 2008-10-01 - 2009-09-30
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