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High genetic diversity in French invasive populations of common ragweed, Ambrosia artemisiifolia, as a result of multiple sources of introduction
TLDR
Results suggest that the French invasive populations include plants from a mixture of sources, and reduced diversity in populations distant from the original area of introduction indicated that ragweed range expansion probably occurred through sequential bottlenecks from theOriginal populations, and not from subsequent new introductions.
Local adaptation in host–parasite systems
TLDR
It is concluded that local adaptation is an average phenomenon that requires adequate replication at the appropriate level, that at which the local processes occur, and variable selection pressure and stochasticity may obscure local processes or change the level at which local adaptation occurs.
Effects of male sterility on reproductive traits in gynodioecious plants: a meta-analysis
TLDR
Overall, females compared to hermaphrodites produced more but smaller flowers, had higher fruit set, higher total seed production, and produced heavier seeds that germinated better, suggesting either that the protective role of the perianth constrains the evolution of sexual size dimorphism in species with many ovules or that selection for adequate pollinated species impedes the reduction in flower size of females.
MAINTENANCE OF GYNODIOECY IN SILENE ACAULIS (CARYOPHYLLACEAE): STAGE‐SPECIFIC FECUNDITY AND VIABILITY SELECTION
TLDR
Through a combination of field and greenhouse experiments, I examined the factors contributing to the maintenance of female individuals in natural populations of the gynodioecious alpine plant Silene acaulis, finding that females can achieve equilibrium frequencies even in the absence of seed set differences.
Incidence and effects of four parasites in natural populations of bumble bees in Switzerland
TLDR
Workers parasitized by C bombi were significantly less likely to forage for pollen and had developed ovaries in significantly more cases than did uninfested workers.
LOCAL MALADAPTATION IN THE ANTHER‐SMUT FUNGUS MICROBOTRYUM VIOLACEUM TO ITS HOST PLANT SILENE LATIFOLIA: EVIDENCE FROM A CROSS‐INOCULATION EXPERIMENT
TLDR
Local adaptation in the insect‐transmitted fungal pathogen Microbotryum violaceum and its host plant Silene latifolia is studied and it is found that migration among partly isolated populations may introduce novel host plant resistance variants more often than novel parasite virulence variants.
Nuclear and Chloroplast Microsatellites Show Multiple Introductions in the Worldwide Invasion History of Common Ragweed, Ambrosia artemisiifolia
TLDR
The results indicate that the expansion in Europe mostly occurred through long-distance dispersal, explaining the absence of isolation by distance and the weak influence of geography on the genetic structure in this area in contrast to the native range.
Cophylogeny of the anther smut fungi and their caryophyllaceous hosts: Prevalence of host shifts and importance of delimiting parasite species for inferring cospeciation
TLDR
Genetic similarity underlying the host-parasite interactions appeared to have the most important influence on specialization and host-shifts: generalist multi-host parasite species were found on closely related plant species, and related species in the Microbotryum phylogeny were associated with members of the same host clade.
Enemy release but no evolutionary loss of defence in a plant invasion: an inter-continental reciprocal transplant experiment
TLDR
It was found that native genotypes were as damaged as invading ones in all experimental sites, suggesting no evolutionary loss of defence against herbivores, and the evolution of increased competitive ability in the North American native ragweed was tested.
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