extinction; Metapopulation genetics; migration; selection; heterogeneity
Vuilleumier S, Buttler A, Perrin N, Yearsley JM (2011), Invasion and eradication of a competitively superior species in heterogeneous landscapes, in ECOLOGICAL MODELLING
, 222(3), 398-406.
Vuilleumier S, Goudet J, Perrin N (2010), Evolution in heterogeneous populations From migration models to fixation probabilities, in THEORETICAL POPULATION BIOLOGY
, 78(4), 250-258.
Vuilleumier S, Bolker BM, Leveque O (2010), Effects of colonization asymmetries on metapopulation persistence, in THEORETICAL POPULATION BIOLOGY
, 78(3), 225-238.
Schwander T, Vuilleumier S, Dubman J, Crespi BJ (2010), Positive feedback in the transition from sexual reproduction to parthenogenesis, in PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
, 277(1686), 1435-1442.
Vuilleumier S, Yearsley JM, Perrin N (2008), The fixation of locally beneficial alleles in a metapopulation, in GENETICS
, 178(1), 467-475.
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.