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Dynamique des gènes en métapopulations hétérogènes

Titel Englisch Gene dynamics in heterogeneous metapopulations
Gesuchsteller/in Vuilleumier Séverine
Nummer 121702
Förderungsinstrument Ambizione
Forschungseinrichtung Département d'Ecologie et d'Evolution Faculté de Biologie et de Médecine Université de Lausanne
Hochschule Universität Lausanne - LA
Hauptdisziplin Oekologie
Beginn/Ende 01.01.2009 - 31.12.2011
Bewilligter Betrag 376'697.00
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Alle Disziplinen (2)


Keywords (5)

extinction; Metapopulation genetics; migration; selection; heterogeneity

Lay Summary (Englisch)

Lay summary
Within a metapopulation, environmental heterogeneity induces variations in habitat quality from population to population, leading to variations in factors such as population size, selection pressure gene flow and genetic drift. These effects are expected to affect the theoretical predictions of the dynamic of genes in a metapopulation. In this context, this research, we will extend the theoretical description of the dynamics of neutral and adaptive genes (time and probability of fixation) and relax assumptions in currently used models.
Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende



Invasion and eradication of a competitively superior species in heterogeneous landscapes
(2011), Invasion and eradication of a competitively superior species in heterogeneous landscapes, in ECOLOGICAL MODELLING, 222(3), 398-406.
Evolution in heterogeneous populations From migration models to fixation probabilities
(2010), Evolution in heterogeneous populations From migration models to fixation probabilities, in THEORETICAL POPULATION BIOLOGY, 78(4), 250-258.
Effects of colonization asymmetries on metapopulation persistence
(2010), Effects of colonization asymmetries on metapopulation persistence, in THEORETICAL POPULATION BIOLOGY, 78(3), 225-238.
Positive feedback in the transition from sexual reproduction to parthenogenesis
(2010), Positive feedback in the transition from sexual reproduction to parthenogenesis, in PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, 277(1686), 1435-1442.
The fixation of locally beneficial alleles in a metapopulation
(2008), The fixation of locally beneficial alleles in a metapopulation, in GENETICS, 178(1), 467-475.

Wissenschaftliche Veranstaltungen

Aktiver Beitrag

Titel Art des Beitrags Titel des Artikels oder Beitrages Datum Ort Beteiligte Personen
Séminaire de l'ESE, Laboratoire Ecologie, Systématique et Evolution (ESE) 15.12.2011 Université Paris-Sud
ESEB 13th Congress of the European Society for Evolutionary Biology 20.08.2011 Tübingen
Mathematical Models in Ecology and Evolution conference 17.08.2011 Groningen
Evolution in metapopulations 30.08.2009 La Fouly (VS) Switzerland
ESEB 12th Congress Turin Italy 24.08.2009 Turin Italy
Evolution of sex-determination mechanisms 17.06.2009 La Sage (VS) Switzerland

Verbundene Projekte

Nummer Titel Start Förderungsinstrument
108100 Demogenetics in metapopulations 01.08.2005 Projektförderung (Abt. I-III)
139421 Gene dynamics in heterogeneous metapopulations 01.01.2012 Ambizione


Natural populations generally inhabit heterogeneous and dynamic environments. This heterogeneity impacts upon their ecology, genetics and evolution. In nature, disturbance events such as floods, fire or harvesting, can cause local population extinction which can have their own spatial and temporal structure. Environmental gradients, as can be found in river flow, ocean currents or wind, generate asymmetric migration pattern. In metapopulation of genetic systems, spatial structure is increasingly being considered but theoretical investigations frequently assuming a homogenous and stable environment and neglect the importance of many ecological processes .The spatial structure and heterogeneities in a metapopulation modifies its migration and recolonization patterns and induces variations in extinction risk and selective pressure. All directly affect the genetic forces within a metapopulation and thus the genetic diversity and the evolutionary potential of populations. Understanding the effect of environmental variability upon genetic variation is also important for systems such as genetically modified organism management or avoidance of drug resistance.Accounting for variation in space and time of extinction rate, migration rate and selection pressure considerably complicates the theoretical, population genetic description of a metapopulation and has received little attention. With simulations, this research will extend the theoretical description of the evolution of a gene in neutral and adaptive conditions by considering (i) spatial and temporal variation in extinction risk and (ii) asymmetric migration. The proposed research will our ability to predict the effect of variation in extinction and recolonization upon genetic variance. To do that a model of a haploid species in a metapopulation in which a locally neutral and adapted beneficial allele is introduced will extended. Then this model will be used to study the effect of spatial patterns of local adaption, migration and extinction upon the fixation probability of neutral and beneficial alleles.Results are expected to make a crucial contribution in the estimation of genetic variance in heterogeneous and dynamic environments. Implications will cover the probability of gene invasiveness, effectiveness of eradication measures, potential impact of the change in disturbance regime from climate change, and guidelines for the management of natural populations.