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The role of roadsides in plant invasions: a demographic approach

机译：路边在植物入侵中的作用：人口统计学方法

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摘要

Non-native plant species are common along roadsides, but presence does not necessarily indicate spread along the road axis. Roadsides may serve merely as habitat for a species spreading independently of roads. The potential conduit function of roads depends on the habitat specificity of the spreading species, its dispersal range relative to the spacing of roads in the landscape, and the relative importance of long- and short-range dispersal. We describe a demographic model of the roadxspecies interaction and suggest methods of assessing conduit function in the field based on the model results. A species limited to roadside habitat will be constrained to spread along the road axis unless its long-range dispersal is sufficient to carry it across the intervening unfavorable area to another road. It will propagate along a road corridor at a rate determined by the scale of short-range dispersal. Effective management of an invasion requires distinguishing between the habitat and conduit functions, a distinction difficult to make with only snapshot data. Invasions can be reconstructed by several methods, but none is totally satisfactory. We suggest comparing stem distributions on transects parallel and perpendicular to the road axis, and beside the road, and away from it, with an idealized Gaussian curve. Such comparisons would allow discrimination between pattern determined by habitat suitability and pattern reflecting random and facilitated dispersal.
机译：非本地植物物种在路边很常见，但存在并不一定表示沿路轴传播。路边仅可作为独立于道路传播的物种的栖息地。道路的潜在管道功能取决于所传播物种的栖息地特异性，其相对于景观道路间距的扩散范围以及远距离和近距离扩散的相对重要性。我们描述了Roadxspecies相互作用的人口统计学模型，并根据模型结果提出了评估野外管道功能的方法。限制在路边栖息地的物种将被限制沿道路轴线传播，除非其远距离分散足以使其穿过居间不利区域到达另一条道路。它会沿着道路走廊以短距离扩散的规模决定的速率传播。有效地管理入侵需要区分栖息地和管道功能，仅凭快照数据很难区分。入侵可以通过几种方法来重建，但没有一个是完全令人满意的。我们建议使用理想化的高斯曲线比较平行于和垂直于道路轴线，与道路轴线并远离道路的横断面上的茎分布。这样的比较将能够区分由栖息地适宜性确定的模式与反映随机的和促进的分散的模式。

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