01498nas a2200133   4500008004100000245019200041210006900233300001000302490000800312520096500320653001401285100001801299856004701317       1995                        eng d00aTrophic links, nutrient fluxes, and natural history in the <i>Allium ursinum</i> food web, with particular reference to life history traits of two hoverfly herbivores (Diptera: Syrphidae)0 aTrophic links nutrient fluxes and natural history in the iAllium  a86-940 v1023 aThe food web centering on Allium ursinum (Liliaceae) in a beech forest (Germany) is described, and temporal variation of active trophic links is related to species’ life cycles. The most important insect herbivores are Cheilosia fasciata (a larval leaf miner) and Portevinia maculata (a larval bulb miner) (Diptera: Syrphidae). Energy, carbon and nitrogen flow in the food chain (Allium-Cheilosia-Phygadeuon ursini) are investigated and analysed with respect to differences in resource allocation by the leaf miner and its hymenoptereous parasitoid. In C. fasciata nitrogen is likely to be the limiting resource, while growth in Phygadeuon ursini appears energy-limited. Larval feeding habits of C. fasciata and Portevinia maculata determined the timing of the species’ life cycles and, as a consequence, appeared to preclude the existence of a pupal parasitoid in Portevinia maculata. Further details of life history traits are demonstrated and discussed.10aSyrphidae1 aHovemeyer, K.  uhttps://syrphidae.myspecies.info/node/9493