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<p>Tropical stream food webs are largely dependent on allochthonous litter, yet the relative importance of its quantity versus nutritional quality in limiting detritivore biomass remains poorly understood. We investigated the direct and indirect drivers of shredder biomass in an Amazonian stream over 16&#xa0;months, focusing on litter quantity, stoichiometric quality (C:N, C:P), and climate-mediated effects. Biomass of shredders was primarily constrained by litter quantity, with nutrient availability having a secondary negative effect. Although precipitation had no direct influence, higher rainfall decreased litter C:N molar ratio, suggesting enhanced nitrogen availability. We conclude that biomass of shredders in this Amazonian stream is regulated by the interaction between resource availability, nutrient balance, and climate dynamics. Litter storage quantity represents strog control, modulated by changes in litter chemistry linked to rainfall and temperature. Our results highlight the critical role of litter availability, chemistry and climate-driven nutrient dynamics in shaping detritivore communities and organic matter processing in tropical streams.</p>

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Direct and indirect drivers of shredders biomass in an Amazonian stream: the roles of litter quantity, quality, and climate-mediated nutrient stoichiometry

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Guilherme Sena,
  • Alan M. Tonin,
  • Renato T. Martins,
  • Neusa Hamada,
  • Renan de Souza Rezende,
  • José F. Gonçalves Júnior

摘要

Tropical stream food webs are largely dependent on allochthonous litter, yet the relative importance of its quantity versus nutritional quality in limiting detritivore biomass remains poorly understood. We investigated the direct and indirect drivers of shredder biomass in an Amazonian stream over 16 months, focusing on litter quantity, stoichiometric quality (C:N, C:P), and climate-mediated effects. Biomass of shredders was primarily constrained by litter quantity, with nutrient availability having a secondary negative effect. Although precipitation had no direct influence, higher rainfall decreased litter C:N molar ratio, suggesting enhanced nitrogen availability. We conclude that biomass of shredders in this Amazonian stream is regulated by the interaction between resource availability, nutrient balance, and climate dynamics. Litter storage quantity represents strog control, modulated by changes in litter chemistry linked to rainfall and temperature. Our results highlight the critical role of litter availability, chemistry and climate-driven nutrient dynamics in shaping detritivore communities and organic matter processing in tropical streams.