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- W2892271615 abstract "Abstract How variations in the strength of bottom-up and top-down forces are mediated by life-history trait differences of insect herbivores is an important but underexplored topic in ecology. Here, we implemented a factorial experiment manipulating plant quality by nitrogen fertilization and attack rates of parasitoids and spiders, respectively. We used sticky traps and mesh barriers in a salt marsh system to examine bottom-up and top-down effects on populations of three hemipteran sap-feeding monophagous species of Phragmites australis with different seasonality. The species included Chloriona alaica and Stenocranus matsumurai most abundant in spring and autumn, respectively, and Dimorphopterus pallipes abundant in both summer and autumn. Fertilization increased the density of S. matsumurai but had no effect on C. alaica and D. pallipes. Its negative effects on densities of the latter two species were even observed in earlier months. On the other hand, parasitoid removal not only increased abundance of all three herbivores, but also reduced the culm diameter, shoot height and biomass of P. australis, suggesting a trophic cascade. The main effects of parasitoid removal were greatest in months when those herbivores had their peak densities. In contrast, spider removal only affected the abundance of S. matsumurai with the greatest effect in September. Our results indicate that parasitoids have strong top-down effects on populations of insect herbivores in P. australis-dominated salt marshes and the strength of their effects is positively correlated with the host density. Furthermore, effects of plant quality and spider predation are more varied among herbivores with different seasonality." @default.
- W2892271615 created "2018-09-27" @default.
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- W2892271615 date "2018-12-01" @default.
- W2892271615 modified "2023-09-24" @default.
- W2892271615 title "Temporal variation in bottom-up and top-down effects differ among herbivores with different seasonality" @default.
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- W2892271615 doi "https://doi.org/10.1016/j.baae.2018.08.007" @default.
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