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<p>Salinization threatens biodiversity and functioning of running waters. We assessed the effects of NaCl contamination on the decomposition of oak (<i>Quercus robur</i> Linnaeus, 1753) leaves with distinct conditioning histories. Mass loss and associated descriptors were evaluated on leaves previously immersed in the stream for 7 (pre-conditioned leaves) or 21 (conditioned leaves) days and further subjected to salinization. Both leaf types were offered to the shredder <i>Schizopelex festiva</i> (Rambur, 1842). Mass loss of conditioned leaves was higher but strongly inhibited by increasing salinization. At 1&#xa0;g/l, conditioned leaves presented greater fungal biomass and degradative activity, while pre-conditioned leaves showed enhanced sporulation rates. Despite higher investment in growth and reproduction on pre-conditioned leaves at intermediate salt levels, a similar reduction on mass loss was observed on either leaf type at ≥ 4&#xa0;g/l. Leaf consumption by <i>S. festiva</i> was consistently lower with conditioned leaves. Distinct communities on pre-conditioned leaves may have stimulated feeding activity across salinities, despite salt-toxicity. Results suggest that higher sporulation and biomass of salt-tolerant fungal communities on pre-conditioned leaves may favor conversion of leaf biomass into production by leaf-consumers while contributing to the stream fungal pool. Leaves’ conditioning history should be considered in guidelines for stream protection and management.</p>

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Importance of leaf conditioning status on leaf litter decomposition in salinized streams

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Ricardo Oliveira,
  • Cristina Canhoto

摘要

Salinization threatens biodiversity and functioning of running waters. We assessed the effects of NaCl contamination on the decomposition of oak (Quercus robur Linnaeus, 1753) leaves with distinct conditioning histories. Mass loss and associated descriptors were evaluated on leaves previously immersed in the stream for 7 (pre-conditioned leaves) or 21 (conditioned leaves) days and further subjected to salinization. Both leaf types were offered to the shredder Schizopelex festiva (Rambur, 1842). Mass loss of conditioned leaves was higher but strongly inhibited by increasing salinization. At 1 g/l, conditioned leaves presented greater fungal biomass and degradative activity, while pre-conditioned leaves showed enhanced sporulation rates. Despite higher investment in growth and reproduction on pre-conditioned leaves at intermediate salt levels, a similar reduction on mass loss was observed on either leaf type at ≥ 4 g/l. Leaf consumption by S. festiva was consistently lower with conditioned leaves. Distinct communities on pre-conditioned leaves may have stimulated feeding activity across salinities, despite salt-toxicity. Results suggest that higher sporulation and biomass of salt-tolerant fungal communities on pre-conditioned leaves may favor conversion of leaf biomass into production by leaf-consumers while contributing to the stream fungal pool. Leaves’ conditioning history should be considered in guidelines for stream protection and management.