He Feng, Sun Jianfan, Wan Justin S H, Nawaz Mohsin, Javed Qaiser, Pan Linxuan, Khattak Wajid Ali, Bo Yanwen, Xiang Yan, Ren Guangqian, Lin Xin, Du Daolin
School of Emergency Management, Jiangsu University, Zhenjiang 212013, China; Institute of Environment and Ecology, School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
School of Emergency Management, Jiangsu University, Zhenjiang 212013, China; Institute of Environment and Ecology, School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China; Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, China.
Sci Total Environ. 2024 Apr 15;921:171135. doi: 10.1016/j.scitotenv.2024.171135. Epub 2024 Feb 23.
The diversity-invasibility hypothesis predicts that native plant communities with high biodiversity should be more resistant to invasion than low biodiversity communities. However, observational studies have found that there is often a positive relationship between native community diversity and invasibility. Pollutants were not tested for their potential to cause this positive relationship. Here, we established native communities with three levels of diversity (1, 2 and 4 species) and introduced an invasive plant [Symphyotrichum subulatum (Michx.) G. L. Nesom] to test the effects of different pollutant treatments (i.e., unpolluted control, microplastics (MPs) alone, cadmium (Cd) alone, and their combination) on the relationship between native community diversity and community invasibility. Our results indicate that different MPs and Cd treatments altered the invasibility of native communities, but this effect may depend on the type of pollutant. MPs single treatment reduced invasion success, and the degree of reduction increased with increasing native community diversity (Diversity 2: - 14.1 %; Diversity 4: - 63.1 %). Cd single treatment increased the aboveground biomass of invasive plants (+ 40.2 %) and invasion success. The presence of MPs inhibited the contribution of Cd to invasion success. Furthermore, we found that the complementarity and selection effects of the native community were negatively correlated with invasion success, and their relative contributions to invasion success also depended on the pollutant type. We found new evidence of how pollutants affect the relationship between native community diversity and habitat invasibility, which provides new perspectives for understanding and managing biological invasions in the context of environmental pollution. This may contribute to promoting the conservation of biodiversity, especially in ecologically sensitive and polluted areas.
多样性-入侵性假说预测，具有高生物多样性的本地植物群落应比低生物多样性群落更能抵抗入侵。然而，观察性研究发现，本地群落多样性与入侵性之间往往存在正相关关系。尚未测试污染物导致这种正相关关系的可能性。在此，我们建立了具有三种多样性水平（1、2和4个物种）的本地群落，并引入一种入侵植物[针叶一枝香（Symphyotrichum subulatum (Michx.) G. L. Nesom）]，以测试不同污染物处理（即未受污染对照、单独的微塑料（MPs）、单独的镉（Cd）及其组合）对本地群落多样性与群落入侵性之间关系的影响。我们的结果表明，不同的MPs和Cd处理改变了本地群落的入侵性，但这种影响可能取决于污染物的类型。MPs单一处理降低了入侵成功率，且降低程度随着本地群落多样性的增加而增加（多样性2：-14.1%；多样性4：-63.1%）。Cd单一处理增加了入侵植物的地上生物量（+40.2%）和入侵成功率。MPs的存在抑制了Cd对入侵成功的贡献。此外，我们发现本地群落的互补效应和选择效应与入侵成功呈负相关，它们对入侵成功的相对贡献也取决于污染物类型。我们发现了污染物如何影响本地群落多样性与栖息地入侵性之间关系的新证据，这为在环境污染背景下理解和管理生物入侵提供了新的视角。这可能有助于促进生物多样性保护，特别是在生态敏感和受污染地区。
