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首页> 外文期刊>Ecological Applications >Human impacts, plant invasion, and imperiled, plant species in California
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Human impacts, plant invasion, and imperiled, plant species in California

机译：加利福尼亚的人类影响，植物入侵和受威胁的植物物种

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摘要

Invasive species are one of the fastest growing conservation problems. These species homogenize the world's flora and fauna, threaten rare and endemic species, and impose large economic costs. Here, we examine the distribution of 834 of the more than 1000 exotic plant taxa that have become established in Califoriiia, USA. Total species richness increases with net primary productivity; however, the exotic flora is richest in low-lying coastal sites that harbor large numbers of imperiled species; while native diversity is highest in areas with high mean elevation. Weedy and invasive exotics are more tightly linked to the distribution of imperiled species than the overall pool of exotic species. Structural equation modeling suggests that while human activities, such as urbanization and agriculture, facilitate the initial invasion by exotic plants, exotics spread ahead of the front of human development into areas with high numbers of threatened native plants. The range sizes of exotic taxa are an order of magnitude smaller than for comparable native taxa. The current small range size of exotic species implies that California has a significant "invasion debt" that will be paid as exotic plants expand their range and spread throughout the state.
机译：入侵物种是发展最快的保护问题之一。这些物种使世界动植物同质化，威胁到稀有和特有物种，并带来巨大的经济损失。在这里，我们研究了在美国加利福尼亚州建立的1000多种外来植物分类中的834种的分布。总物种丰富度随着净初级生产力的增加而增加;但是，外来植物区系最丰富，位于低洼的沿海地区，那里藏有大量濒危物种。而平均海拔高的地区，本地生物多样性最高。杂草和外来入侵物种与受威胁物种的分布更紧密地联系在一起，而不是外来物种的总库。结构方程模型表明，尽管人类活动（如城市化和农业活动）促进了外来植物的最初入侵，但外来物种在人类发展之前就扩散到了濒危本地植物数量众多的地区。外来分类单元的范围大小比可比较的本地分类单元小一个数量级。当前外来物种的范围很小，这意味着加利福尼亚州将承担重大的“入侵债务”，随着外来植物扩大范围并在全州范围内蔓延，这将得到偿付。

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