Factors controlling leaf litter breakdown in Amazonian streams
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Abstract
Our objective was to assess the relative importance of leaf litter quality, and the microbial and aquatic invertebrate communities involved in leaf litter breakdown in Amazonian streams. We test the hypothesis that leaf litter quality is the driving force of leaf breakdown rates, rather than the microbial or invertebrate community, independent of stream characteristics. We incubated 3 g of Eucalyptus camaldulensis (EC), Baccharis platypoda, Symphonia globulifera, Mabea speciosa (MS), and Eperua duckeana (ED) leaves in five streams for 75, 56, 46, 26, 14, or 7 days. In all of the streams, leaf litter breakdown was higher for EC and lower in ED. This result may be related to different chemical characteristics among the five studied species. We observed higher frequency of shredders in MS and stream 4, and scrapers in streams 1 and 2. The concentration of ergosterol was higher in MS and lower in EC when adenosine triphosphate differed significantly among streams. Our data indicated that leaf litter quality (chemical and structural components) is a main factor affecting leaf breakdown in Amazonian streams.
Keywords
Chemical composition Decomposition Riparian vegetation Microbial biomass InvertebratesNotes
Acknowledgements
JFG and NH received research fellowships (procs. 307479/2011-0, 302957/2014-6, and 306328/2010-0 from the National Council for Scientific and Technological Development (CNPq). RSR received a fellowship from CNPq (proc. 151375/2014-3). RTM received a fellowship from the Programa de Apoio à Fixação de Doutores no Amazonas—FIXAM/AM (FAPEAM). RSR Program in Ecology and Conservation of the UFERSA. We are grateful to FAPEAM and CNPq for financing this study through their support of the DCR project “Effects of the input of anthropogenic sediments on the decomposition of leaves in central Amazonian streams” and the CT-Amazonia project “Anthropogenic sediments in Amazonian streams: impacts on aquatic macroinvertebrates and ecological functioning” (process 575875 2008-9). The CT-Amazônia/CNPq (Proc. 575875/2008-9), Pronex/CNPq/Fapeam—Aquatic insects, CT-Hidro/Climatic Changes/Water Resources/CNPq (Proc. 403949/2013-0), INCT ADAPTA (CNPq/FAPEAM), PROCAD/CAPES 21/2009, and National Program for Support and Development of Botany (Nº: AUX-PE-PNADB 1098/2010) projects supported the invertebrate sampling and laboratory analysis experiments.
Supplementary material
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