Habitat fragmentation alters the distance of abiotic seed dispersal through edge effects and direction of dispersal
Habitat fragmentation alters the distance of abiotic seed dispersal through edge effects and direction of dispersal
复制标题
栖息地破碎化通过边缘效应和传播方向改变非生物种子传播的距离
DOI：
10.1002/ecy.3586
复制
发表时间：
2021
期刊：
影响因子：
4.8
通讯作者：
Brudvig, Lars A.
中科院分区：
文献类型：
--
作者：
Warneke, Christopher R.;Caughlin, T. Trevor;Damschen, Ellen I.;Haddad, Nick M.;Levey, Douglas J.;Brudvig, Lars A.
栖息地丧失和破碎化是物种减少的主要原因，部分原因是扩散减少。然而，要将分散化对扩散的影响孤立出来是令人生畏的，因为分散化的后果通常是相互交织的，例如连接性降低和边缘效应的普遍性增加。我们使用了一个大规模的景观实验来分离破碎化对种子传播的影响，同时考虑了局部传播的距离和方向。我们评估了五种风或重力分散的草本植物物种的种子传播，这些植物种植在距离栖息地边缘不同距离的片段内，这些片段的连接性和形状（边缘面积比）不同。扩散距离的影响，相对于最近的边缘的接近和方向。对于五个物种中的四个，扩散距离更大，从栖息地的边缘，当种子分散在最近的边缘的方向。连通性和斑块边缘面积比对局部扩散的影响最小。我们的研究结果说明了一些，但不是全部，景观变化与破碎化可以影响种子传播的关键人口过程。
Habitat loss and fragmentation are leading causes of species declines, driven in part by reduced dispersal. Isolating the effects of fragmentation on dispersal, however, is daunting because the consequences of fragmentation are typically intertwined, such as reduced connectivity and increased prevalence of edge effects. We used a large‐scale landscape experiment to separate consequences of fragmentation on seed dispersal, considering both distance and direction of local dispersal. We evaluated seed dispersal for five wind‐ or gravity‐dispersed, herbaceous plant species that were planted at different distances from habitat edges, within fragments that varied in their connectivity and shape (edge‐to‐area ratio). Dispersal distance was affected by proximity and direction relative to the nearest edge. For four of five species, dispersal distances were greater further from habitat edges and when seeds dispersed in the direction of the nearest edge. Connectivity and patch edge‐to‐area ratio had minimal effects on local dispersal. Our findings illustrate how some, but not all, landscape changes associated with fragmentation can affect the key population process of seed dispersal.