How important is long‐distance seed dispersal for the regional survival of plant species?
How important is long‐distance seed dispersal for the regional survival of plant species?
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DOI：
10.1111/j.1366-9516.2005.00148.x
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发表时间：
2005-03
影响因子：
4.6
通讯作者：
M. Soons;W. Ozinga
中科院分区：
文献类型：
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作者：
M. Soons;W. Ozinga
长距离种子传播通常被认为对植物物种的区域生存很重要。在这项研究中，我们以风传播为例，量化了长距离种子传播对植物物种区域生存的重要性。我们使用了一种新的方法，首先将植物物种的传播特征与种子传播内核联系起来，然后将内核与物种的区域生存联系起来。我们使用了最近开发和测试的机械种子传播模型来计算扩散内核的传播性状。我们使用了190种植物的数据，并以两种方式计算了它们的区域生存率，使用了世纪大部分时间内覆盖荷兰的36,800个1平方公里网格单元和10,754个小地块的物种分布数据。我们进行了相关性和逐步多元回归分析，以量化远距离传播的重要性，表示为分散内核的99百分位分散距离，相对于中位距离传播和其他可能有助于解释区域生存的植物性状的重要性：植物寿命（一年生，两年生，多年生），种子寿命和植物营养需求。结果表明，长距离扩散在决定区域生存方面发挥着作用，比中距离扩散和植物寿命更重要。然而，风的远距离传播只能解释物种间区域生存差异的1-3%，与种子寿命同等重要，远不如营养需求重要。在不断变化的景观中，例如在荷兰，世纪发生了大规模的富营养化和栖息地破坏，植物性状表明在变化的、日益丰富的营养条件下生长的能力，对区域生存比种子传播更重要。
Long‐distance seed dispersal is generally assumed to be important for the regional survival of plant species. In this study, we quantified the importance of long‐distance seed dispersal for regional survival of plant species using wind dispersal as an example. We did this using a new approach, by first relating plant species’ dispersal traits to seed dispersal kernels and then relating the kernels to regional survival of the species. We used a recently developed and tested mechanistic seed dispersal model to calculate dispersal kernels from dispersal traits. We used data on 190 plant species and calculated their regional survival in two ways, using species distribution data from 36,800 1 km2‐grid cells and 10,754 small plots covering the Netherlands during the largest part of the 20th century. We carried out correlation and stepwise multiple regression analyses to quantify the importance of long‐distance dispersal, expressed as the 99‐percentile dispersal distance of the dispersal kernels, relative to the importance of median‐distance dispersal and other plant traits that are likely to contribute to the explanation of regional survival: plant longevity (annual, biennial, perennial), seed longevity, and plant nutrient requirement. Results show that long‐distance dispersal plays a role in determining regional survival, and is more important than median‐distance dispersal and plant longevity. However, long‐distance dispersal by wind explains only 1–3% of the variation in regional survival between species and is equally important as seed longevity and much less important than nutrient requirement. In changing landscapes such as in the Netherlands, where large‐scale eutrophication and habitat destruction took place in the 20th century, plant traits indicating ability to grow under the changed, increasingly nutrient‐rich conditions turn out to be much more important for regional survival than seed dispersal.