Aphid Gall Interactions with Forest Tree Genotypes Influence Leaf Litter Decomposition in Streams

摘要: Genetic variation within a dominant riparian forest tree affects susceptibility to leaf-galling aphid (Pemphigus betae), which induces phytochemical and structural changes in leaf tissue. Research Highlights: We show here that these tissue alter adjacent in-stream litter decomposition rates the aquatic macroinvertebrate community associated with stream for some Populus genotypes. Background Objectives: Naturally occurring hybrid cottonwoods (Populus fremontii × angustifolia) are differentially susceptible attack vary induced phytochemistry following attack. When leaves galled by aphids, foliar is altered structurally (through formation of pea-sized gall structures) phytochemically an increase condensed tannin concentrations). Materials Methods: To examine effect aphid-galled on processes, we collected both un-galled from five clones three cottonwood genotypes experimental forest. measured rates, fungal biomass composition. Results: Decomposition differed among treatments, 27% acceleration rate one genotype compared its own no differences between litters other two Genotype status interactions also occurred measures phytochemistry, indicating prevalence complex interactions. Similarly, found variable responses community, where demonstrated litter. Conclusions: These data suggest plant genetics terrestrial herbivory may be important linking processes examination at finer scales (e.g., species, hybrids individuals) reveals ecosystem patterns.