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首页> 外文期刊>Global ecology and biogeography >Deconstructing the native-exotic richness relationship in plantsTI Deconstructing the native-exotic richness relationship in plants
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Deconstructing the native-exotic richness relationship in plantsTI Deconstructing the native-exotic richness relationship in plants

机译：解构植物中的自然-外来丰富度关系TI解构植物中的自然-外来丰富度关系

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Aim Classic theory suggests that species-rich communities should be more resistant to the establishment of exotic species than species-poor communities. Although this theory predicts that exotic species should be less diverse in regions that contain more native species, macroecological analyses often find that the correlation between exotic and native species richness is positive rather than negative. To reconcile results with theory, we explore to what extent climatic conditions, landscape heterogeneity and anthropogenic disturbance may explain the positive relationship between native and exotic plant richness. Location Catalonia (western Mediterranean region). Methods We integrated floristic records and GIS-based environmental measures to make spatially explicit 10-km grid cells. We asked whether the observed positive relationship between native and exotic plant richness (R-2 = 0.11) resulted from the addition of several negative correlations corresponding to different environmental conditions identified with cluster analysis. Moreover, we directly quantified the importance of common causal effects with a structural equation modelling framework. Results We found no evidence that the relationship between native and exotic plant richness was negative when the comparison was made within environmentally homogeneous groups. Although there were common factors explaining both native and exotic richness, mainly associated with landscape heterogeneity and human pressure, these factors only explained 17.2% of the total correlation. Nevertheless, when the comparison was restricted to native plants associated with human-disturbed (i.e. ruderal) ecosystems, the relationship was stronger (R-2 = 0.52) and the fraction explained by common factors increased substantially (58.3%). Main conclusions While our results confirm that the positive correlation between exotic and native plant richness is in part explained by common extrinsic factors, they also highlight the great importance of anthropic factors that - by reducing biotic resistance - facilitate the establishment and spread of both exotic and native plants that tolerate disturbed environments.
机译：经典目标理论认为，物种丰富的社区应该比物种匮乏的社区更抵制外来物种的建立。尽管该理论预测外来物种在包含更多本地物种的区域中应具有较少的多样性，但是宏观生态学分析通常发现外来物种和本地物种丰富度之间的相关性是正的而不是负的。为了使结果与理论相符，我们探讨了气候条件，景观异质性和人为干扰在多大程度上可以解释本地和外来植物丰富度之间的正相关关系。位置加泰罗尼亚（地中海西部地区）。方法我们将植物学记录和基于GIS的环境措施相结合，以形成空间明确的10公里网格单元。我们问是否观察到的本地和外来植物丰富度之间的正相关关系（R-2 = 0.11）是否是由于添加了与通过聚类分析确定的不同环境条件相对应的几个负相关关系而导致的。此外，我们使用结构方程建模框架直接量化了常见因果效应的重要性。结果我们发现没有证据表明，当在环境均质组中进行比较时，本地和外来植物丰富度之间的关系为负。尽管存在解释本地和外来丰富度的共同因素，主要与景观异质性和人类压力有关，但这些因素仅解释了总相关度的17.2％。但是，当比较仅限于与人为干扰（即ruderal）生​​态系统相关的本地植物时，这种关系更强（R-2 = 0.52），而由公因子解释的分数显着增加（58.3％）。主要结论尽管我们的结果证实，外来植物和本地植物丰富度之间存在正相关，部分原因是常见的外部因素，但它们也凸显了人类因素的重要意义-通过降低生物抗性-促进外来植物和外来植物的建立和传播耐受干扰环境的本地植物。

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