Functional trait-based potential invasiveness of exotic submerged macrophytes and their effects on sediment bacterial community
Functional trait-based potential invasiveness of exotic submerged macrophytes and their effects on sediment bacterial community
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DOI：
10.1007/s10750-022-04914-9
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发表时间：
2022-06
期刊：
影响因子：
2.6
通讯作者：
Xiaowei Li;Qingshuai Chu;Na Tang;Hirpa Abduro Ogo;W. Xing
中科院分区：
文献类型：
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作者：
Xiaowei Li;Qingshuai Chu;Na Tang;Hirpa Abduro Ogo;W. Xing
外来物种的功能性状在其入侵过程中发挥着重要作用，通过增强其性能，促进其成为潜在的恶性入侵物种。然而，外来水生物种的功能性状与入侵能力之间的相互关系尚不清楚。在这里，我们选择了两种外来水生物种-和水狐尾藻Myriophyllum aquaticum（Vell.）Verdc。和两个近缘种黑藻Hydrilaverticillata（L.）f.）Royle和狐尾藻Myriophyllum spicatum L.从功能特征及其对沉积物细菌群落的影响来揭示外来沉水植物的潜在入侵性。结果表明，外来种与本地种之间没有明显的竞争关系。相关的本地物种的许多功能性状H。verticillata表现显著优于外来种E.密叶侧叶面积近缘原生种M.穗花针茅在相对生长速率、营养盐浓度等重要功能性状上也具有明显优势。两种外来物种的地下部分对沉积物细菌群落结构有显著影响。由于发达的根和它们的径向氧损失的外来物种E。densaandM.水生生物中，底泥细菌群落多样性与外来种比例呈正相关。链霉菌等优势细菌可能通过反馈作用加速外来物种的入侵。总体而言，外来植物的竞争能力和功能性状与相关的本地物种相比，没有表现出明显的入侵能力。然而，与沉积物细菌的正相互作用和适度的种间关系可能会促进外来沉水植物物种的入侵。研究结果为外来水生植物的风险评估和有效管理提供了理论依据。
Functional traits of exotic species play an important role in their invasive process by enhancing their performance and promoting them as a potentially malignant invasive species. However, the interrelationship between functional traits and invasion capacity of exotic aquatic species is still not clear. Here, we selected two exotic aquatic speciesEgeria densaPlanch. andMyriophyllum aquaticum(Vell.) Verdc. and two related native speciesHydrilla verticillata(L. f.) Royle andMyriophyllum spicatumL. in China to reveal the potential invasiveness of exotic submerged macrophytes based on functional traits and their effects on sediment bacterial community. Our results showed that there was no significant competition between exotic species and related native species. Many functional traits of related native speciesH. verticillataperformed significantly better than exotic speciesE. densabeside leaf area. Related native speciesM. spicatumalso had obvious advantages in important functional traits such as relative growth rate and nutrient concentrations. The belowground part of two exotic species had significant effects on sediment bacterial community. Due to developed roots and their radial oxygen loss of exotic speciesE. densaandM. aquaticum, the diversity of sediment bacterial community positively correlated with exotic species ratio in treatment. Some dominant sediment bacteria, such asStreptomyces, might accelerate the invasion of exotic species through feedback effects. In general, compared with related native species, the competitive ability and functional traits of exotic plants did not show significant invasion ability. However, positive interaction with sediment bacteria and moderate interspecific relationships may promote the invasion of exotic submerged macrophyte species. Our results provide a theoretical basis for risk assessment and effective management of exotic aquatic plants.