IRD researcher based at MIVEGEC lab in Montpellier, I work on the evolution of life history traits. For this, I use quantitative genetics to estimate the variance due to genetic. I run experiments on several biological models such as locusts, bacteria, nematodes (plant and insect parasitic) and freshwater snails. I did uni- and multi-traits approaches of the FST/QST comparison in order to study the selection and evolution of life history traits in heterogeneous environments. Then, I explored the consequences on life history traits of a native species in relation to a biological invasion. I am now looking at vectorial capacity and trait variation. More particularly, I am interested in the pair Lymnaea (freshwater snail)-trematodes. Indeed, those snails are vectors, among others, of Fasciola hepatica, a trematode, responsible of fasciolosis (an infectious disease causing major problems in human and animal health). But they are also "great invaders". Thus, I choose to investigate the potential consequences of a vector invasion in the spread of diseases. Pandemics and the expansion of pathogens can be linked to biological invasions. Invasive non-pathogenic species, and infectious diseases may directly or indirectly impact human health, agriculture and wildlife conservation. To understand invasion and its consequences for the (re)emergence of infectious diseases which is essential for human health, we need to disentangle the multiple mechanisms by which introduced vector species may change parasite ecology and transmission. I study life history traits and the mating system of vectors and their consequences on (re)emerging infectious diseases. By this way, it could provide further insights into their prediction, control and management.