Variation in life-history traits among Urtica dioica populations with different history in parasitism by the holoparasitic plant Cuscuta europaea
Tóm tắt
Several studies demonstrate that natural enemies (e.g. parasites) have profound negative effects on the life-history traits of their hosts. If the host can compensate for the negative effects of parasitic infection by altering its life history, these modifications may partly form the basis of resistance or tolerance against parasites. Thus, parasites may be of considerable importance in shaping the evolution of life-history traits of their hosts. To examine if previous parasitism is associated with differences in life-history traits of the host, I conducted a common garden experiment with Urtica dioica plants originating from eight populations of which four were unparasitized, and four parasitized by the holoparasitic plant, Cuscuta europaea. A field survey indicated no differences between unparasitized and parasitized populations in, for example, the number of plant species and nutrient levels in the soil. Thus, it seems reasonable to assume that differences in life-history traits between the two population types in the common garden would reflect the effects of previous selection by the parasite. In the common garden, plants from parasitized populations started to flower later and allocated less biomass to asexual reproduction (measured as the production of stolons, i.e. clonal propagation) compared to plants from unparasitized populations. These results thus indicate that selection by the parasite may have favoured later onset of flowering, and may have selected against asexual reproduction.
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