Shift in the synchronisation of leaf decay processes in fragmented streams

气候变化将增加干旱期和干旱，导致过早落叶和小溪流暂时分裂成一系列水池。这种低流量或现在的情况与垃圾输入的匹配可能会改变流中的垃圾腐烂。我们假设不匹配和物理浸出，微生物降解和大型无脊椎动物切碎之间的特殊相互作用。我们想通过暴露凋落物包（Alnus droughosa（L.）Gaertn.）评估环境参数的变化，叶片质量损失率，以及微生物（真菌）和切碎的大型无脊椎动物在叶片上的定植。将碎纸机从垃圾袋中排除将提供有关其相对重要性的信息。在实验室中进行微观实验，以隔离在现场发现的酶活性和微生物腐烂率的因素组合（温度，渗滤液，氧气）的影响。用钩虾进行饲养实验，测试次生叶化合物、临界氧浓度和温度对切碎的影响。结果将结合在一个描述性的模型叶腐烂和潜在的转变，在破碎流叶腐烂过程的同步。

Climate change will increase dry periods and droughts, which cause both, premature leaf fall and temporary fragmentation of small streams into a series of pools. This match of low or now flow situations with litter input is likely to alter litter decay in streams. We hypothesise mismatch and special interaction between physical leaching, microbial degradation and macroinvertebrate shredding. We want to manipulate pools of summer-dry streams by exposing litter packs (Alnus glutinosa (L.) Gaertn.) to assess the shift of environmental parameters, leaf mass loss rates, and leaf colonisation by microbes (fungi) and shredding macroinvertebrates. Exclusion of shredders from litterbags will give information on their relative importance. Microcosm experiments in the laboratory are conducted to isolate the effect of factor combinations (temperature, leachate, oxygen) found in the field on enzymatic activities and microbial decay rates. Feeding experiments with Gammarus pulex shall test the effect of secondary leaf compounds, critical oxygen concentration and temperature on shredding. The results will be combined in a descriptive model of leaf decay and the potential shift in the synchronisation of leaf decay processes in fragmented streams.