Native macrophyte density and richness affect the invasiveness of a tropical poaceae species.
Native macrophyte density and richness affect the invasiveness of a tropical poaceae species.
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DOI：
10.1371/journal.pone.0060004
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Bini LM
中科院分区：
文献类型：
--
作者：
Michelan TS;Thomaz SM;Bini LM
当地物种丰富度和密度在生态系统入侵中的作用是生态学家和管理者共同关注的问题。我们验证了这样的假设，即淡水生态系统中本地水生植物的物种丰富度和丰度对新热带地区非本地水生植物的入侵能力有负面影响。我们首先在温室中创建了四个水平的大型植物丰富度(丰富度实验)，然后在第二个实验(密度实验)中操纵了相同本地物种的密度。当本地大型植物为成体时，加入节节植物片段，并对它们的生长进行评估。丰富度实验的结果证实了当地物种丰富度与黑麦草生长呈负相关关系的假说，以芽长和根生物量来衡量。然而，对入侵的抵抗力并不是由于存在具有更强竞争能力的特定本土物种。在密度实验中，随着5个本地树种密度的增加，黑刺松材线虫的生长显著下降。密度以一种负面的方式强烈地影响了禾本科植物的表现，这表明那些被本地大型植物密集定植且较少受到干扰的斑块将比那些定殖度较差且更容易受到干扰的斑块更能抵抗入侵。我们的密度实验还表明，一些物种表现出比其他物种更高的竞争能力(采样效应)。虽然当地的丰富性和丰富性明显限制了大麦的定居和建立，但这些因素并不能完全阻止这种禾本科物种对水生生态系统的入侵。
The role of the native species richness and density in ecosystem invasibility is a matter of concern for both ecologists and managers. We tested the hypothesis that the invasiveness of Urochloa arrecta (non-native in the Neotropics) is negatively affected by the species richness and abundance of native aquatic macrophytes in freshwater ecosystems. We first created four levels of macrophyte richness in a greenhouse (richness experiment), and we then manipulated the densities of the same native species in a second experiment (density experiment). When the native macrophytes were adults, fragments of U. arrecta were added, and their growth was assessed. Our results from the richness experiment corroborated the hypothesis of a negative relationship between the native species richness and the growth of U. arrecta, as measured by sprout length and root biomass. However, the resistance to invasion was not attributed to the presence of a particular native species with a greater competitive ability. In the density experiment, U. arrecta growth decreased significantly with an increased density of all five of the native species. Density strongly affected the performance of the Poaceae in a negative manner, suggesting that patches that are densely colonized by native macrophytes and less subject to disturbances will be more resistant to invasion than those that are poorly colonized and more commonly subjected to disturbances. Our density experiment also showed that some species exhibit a higher competitive ability than others (sampling effect). Although native richness and abundance clearly limit the colonization and establishment of U. arrecta, these factors cannot completely prevent the invasion of aquatic ecosystems by this Poaceae species.
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影响因子：
2.6
作者：
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发表时间：
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影响因子：
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