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We evaluated the effect of leaves of native and exotic tree species on the feeding activity and performance of the larvae of  Triplectides gracilis , a typical caddisfly shredder in Atlantic Forest streams. Leaves of four native species that differ in chemistry and toughness ( Hoffmannia dusenii ,  Miconia chartacea ,  Myrcia lineata  and  Styrax pohlii ) and the exotic  Eucalyptus globulus  were used to determine food preferences and rates of consumption, production of fine particulate organic matter (FPOM), growth and survival of shredders. We hypothesized that the consumption rates of leaves of  Eucalyptus  and their effects on the growth and survival of shredders could be predicted by leaf chemistry and toughness. The larvae preferred to feed on soft leaves ( H .  dusenii  and  M .  chartacea ) independently of the content of nutrients (N and P) and secondary compounds (total phenolics). When such leaves were absent, they preferred  E .  globulus  and did not consume the tough leaves ( M .  lineata  and  S .  pohlii ). In monodietary experiments, leaf consumption and FPOM production differed among the studied leaves, and the values observed for the  E .  globulus  treatments were intermediate between the soft and tough leaves. The larvae that fed on  H .  dusenii  and  M .  chartacea  grew constantly over five weeks, while those that fed on  E .  globulus  lost biomass. Larval survival was higher on leaves of  H .  dusenii ,  M .  chartacea  and  S .  pohlii  than on  E .  globulus  and  M .  lineata  leaves. Although  E .  globulus  was preferred over tougher leaves, long-term consumption of leaves of the exotic species may affect the abundance of  T .  gracilis  in the studied stream. Additionally, our results suggest that leaf toughness can be a determining factor for the behavior of shredders where low-quality leaves are abundant, as in several tropical streams.

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Exotic Eucalyptus leaves are preferred over tougher native species but affect the growth and survival of shredders in an Atlantic Forest stream (Brazil)