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article/chapitre/communication
R. Bommarco ; B. Ekbom | 19961. Seasonal population growth rates for the pea aphid, Acyrthosiphon pisum Harris, were determined in three different host plant habitats; alfalfa, Medicago sativa (L.), clover, Trifolium pratense (L.), and peas, Pisum sativum (L.); over four ye[...]article/chapitre/communication
The existence of a continuous array of sympatric biotypes-from polymorphisms, through ecological or host races with increasing reproductive isolation, to good species-can provide strong evidence for a continuous route to sympatric speciation via[...]article/chapitre/communication
W. Jeschke ; P. Baumel ; N. Rath ; F. Czygan ; P. Proksch | 1994A recently developed empirically based modelling technique was used to quantify uptake, flow and utilization of C and N in Lupinus albus L., uninfected and parasitized by Cuscuta reflexa Roxb. plants over a 12 d period during flowering and early[...]article/chapitre/communication
W. Jeschke ; A. Baig ; A. Hilpert | 1997