Invasive alien shredders clear up invasive alien leaf litter.
Invasive alien shredders clear up invasive alien leaf litter.
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DOI：
10.1002/ece3.4430
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发表时间：
2018-10
影响因子：
2.6
通讯作者：
Brown LE
中科院分区：
文献类型：
--
作者：
Doherty-Bone TM;Dunn AM;Brittain J;Brown LE
生物入侵具有深刻改变生态系统进程的潜力，但入侵者很少单独出现。不同外来入侵物种之间的相互作用，以及它们对生态系统功能的累积影响，导致了入侵崩溃的假设，由此影响变得累加，导致进一步的生态系统压力。入侵的河岸植物（如蓬杜鹃）在淡水中沉积凋落叶，这些凋落叶可能不会被本地物种消耗，从而潜在地影响栖息地的异质性和食物网的能量流动。然而，外来入侵十足甲壳类动物是凋落叶的有效消费者，并且假设它们也会消耗入侵河岸凋落叶的输入。本研究表明，外来信号螯虾（Pacifastacus leniusculus）和中华绒螯蟹（Eriocheir sinensis）对不同类型凋落叶的分解效率均高于本地白爪螯虾（white -螯龙虾）。次生产物多样性更强，较难消化的外来凋落叶产生的细颗粒物有机质更多。不同叶种对十足动物体质量的影响不同，但不同叶种对十足动物体质量的影响是不均匀的：大叶松柏在食用红叶松柏时体质量损失较小，而黄叶松柏在食用黄叶松柏时体质量损失较小。因此，入侵的外来十足类动物可能会缓冲河岸入侵对淡水中碎屑积累的影响，这表明需要更详细地考虑生物入侵期间的正、负种间反馈。
Biological invasions have the potential to alter ecosystem processes profoundly, but invaders are rarely found alone. Interactions between different invasive alien species, and their cumulative impact on ecosystem functioning, have led to hypotheses of invasion meltdown whereby effects become additive leading to further ecosystem stress. Invasive riparian plants (e.g., Rhododendron ponticum) deposit leaf litter in freshwaters, which may be unconsumed by indigenous species, potentially affecting habitat heterogeneity and flow of energy to the food web. However, invasive alien decapod crustaceans are effective consumers of leaf litter, and it was hypothesized that they would also consume inputs of invasive riparian leaf litter. This study shows that invasive alien signal crayfish (Pacifastacus leniusculus) and Chinese mitten crab (Eriocheir sinensis) effectively break down different types of leaf litter, including invasive alien R. ponticum, at higher rates than indigenous white‐clawed crayfish. Secondary products were more varied, with more fine particulate organic matter generated for the less palatable alien leaf litter species. Leaf species caused different changes in body mass of decapods but effects were heterogeneous by leaf and decapod: P. leniusculus showed lower mass loss when consuming R. ponticum while E. sinensis lost mass when consuming A. pseudoplatanus. Impacts of riparian invasions on detritus accumulation in freshwaters are thus potentially buffered by invasive alien decapods, illustrating a need for a more detailed consideration of both positive and negative interspecific feedbacks during biological invasions.
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影响因子：
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