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We compared quality parameters of 8 tree species from Portugal and 8 from Venezuela. The tropical leaves were tougher, but did not differ from temperate leaves in terms of N, C: N, and polyphenols. In multiple\u2010choice experiments, shredders from Portugal (<jats:italic>Sericostoma vittatum<\/jats:italic> and <jats:italic>Chaetopteryx lusitanica<\/jats:italic>) and from Venezuela (<jats:italic>Nectopsyche argentata<\/jats:italic> and <jats:italic>Phylloicus priapulus<\/jats:italic>) discriminated among conditioned leaves, preferentially consuming softer leaves. In another set of experiments, all shredders preferentially fed on conditioned rather than unconditioned leaves, grew faster when fed conditioned than unconditioned leaves and fed more on temperate than tropical leaves. We conclude that leaf litter from the tropics is a low\u2010quality resource compared to leaves in temperate systems, because of differences in toughness, and that tropical shredders benefit from microbial colonization, as previously demonstrated for temperate systems. We suggest that leaf toughness could be one explanation for the reported paucity of shredders in some tropical streams. (\u00a9 2010 WILEY\u2010VCH Verlag GmbH &amp; Co. KGaA, Weinheim)<\/jats:p>","DOI":"10.1002\/iroh.200911173","type":"journal-article","created":{"date-parts":[[2010,2,12]],"date-time":"2010-02-12T17:59:39Z","timestamp":1265997579000},"page":"27-41","source":"Crossref","is-referenced-by-count":94,"title":["Leaf Quality of Some Tropical and Temperate Tree Species as Food Resource for Stream Shredders"],"prefix":"10.1002","volume":"95","author":[{"given":"Manuel A. 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