Effects of riparian forest and annual variation in stream environmental conditions on leaf litter breakdown and invertebrate communities in highland grassland streams

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Emanuel Rampanelli Cararo, Renan de Souza Rezende
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Abstract

Leaf litter breakdown is a critical process in streams, as it plays a significant role in influencing food webs and biogeochemical cycles. Highland grasslands are often understudied landscapes, yet they are an excellent model system for evaluating how natural differences in riparian forest cover can influence litter breakdown in streams. We experimentally examined the effects of the presence and absence of riparian forest on temporal leaf litter breakdown and the associated biota in highland grassland streams. The 3-year experiment examined leaf litter breakdown in three stream reaches with riparian forest and three without. The results indicate that temperature could potentially mediate the temporal dynamics of leaf litter breakdown (mainly fine mesh) and the associated biota in highland grassland streams. No differences were found in leaf breakdown between stream reach types, but there was evidence of an increase in invertebrate density. Finally, leaf litter breakdown in the highland grasslands was more affected by annual variation than riparian forest presence, suggesting a context-dependent relationship.

Abstract Image

河岸林和溪流环境条件的年度变化对高原草原溪流落叶分解和无脊椎动物群落的影响
落叶分解是溪流中的一个关键过程,因为它在影响食物网和生物地球化学循环方面发挥着重要作用。高原草地通常是未被充分研究的景观,但它们却是评估河岸森林覆盖率的自然差异如何影响溪流中的落叶分解的极佳模型系统。我们通过实验研究了河岸林的存在与否对高原草地溪流中的落叶分解及相关生物群的影响。这项为期 3 年的实验考察了 3 条有河岸林和 3 条没有河岸林的溪流的落叶分解情况。结果表明,温度有可能对高原草原溪流落叶(主要是细网状落叶)分解的时间动态和相关生物群系起到潜在的调节作用。不同类型溪流之间的落叶分解没有差异,但有证据表明无脊椎动物密度有所增加。最后,与河岸森林的存在相比,高原草地的落叶分解受年度变化的影响更大,这表明两者之间存在着一种依赖关系。
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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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