Effect of leaf litter characteristics on leaf conditioning and on consumption by Gammarus pulex

摘要: Summary Terrestrial leaf litter inputs provide an essential energy source for many freshwater organisms. Processing of involves several physicochemical and biological factors but always starts with the colonisation leaves by aquatic hyphomycetes. Here, we document changes occurring on tissues three tree species, alder, hornbeam oak, contrasted properties. Changes in mechanical properties fungal growth were followed at 10, 25, 35, 45 55 days immersion natural winter conditions. We hypothesised that will be faster characteristics decrease more rapidly softer, nutrient-rich, than tougher leaves. In addition, tested whether consumption rate conditioned amphipod shredder Gammarus pulex was correlated their ergosterol content (as a proxy biomass). Leaf toughness decreased (with different rates 3 species), whereas thickness remained stable. The alder changed similarly, contrast to oak Ergosterol contents increased over time which delayed. content, G. pulex significantly correlated. Leaf higher soft tough leaves. Our results suggest types may delayed according required acquire conditioning sufficient consumption. presence riparian vegetation constitute reservoir trophic resources available organisms end winter, when have been entirely consumed. diversity hence contribute sustaining availability food adjacent ecosystems.