The evolution of competition among herbivores
The spider mites Tetranychus urticae and T. evansi co-occur on tomato. This plant can accumulate different amounts of cadmium in its aerial parts, creating a heterogeneous environment for the mites. We are investigating the consequences of this heterogeneity for the outcome of competition and how it interacts with other ecological factors such as plant defences. This information will allow testing how evolution in different environments affects intra- and interspecific competition in spider mites. |
Intraspecific variation, genetic correlations and species coexistence
Intraspecific trait variation and their correlation may affect the ecology and evolution of species coexistence. We are addressing (a) the potential correlation between variation in growth rates and carrying capacity, among reproductive traits and between behavioural and life-history traits (in spiders); (b) how individual variation in reproductive interference, niche width and in defence manipulation affects species coexistence. |
Reproductive isolation
Spider mite species/populations exhibit different degrees of reproductive isolation. We are testing how different factors, such as endosymbionts, ecological specialization (i.e. host plant use), reproductive interference and competition affect isolation patterns. Conversely, we are addressing how reproductive isolation affects the outcome of competition and the likelihood of coexistence. |