Spatial and temporal patterns of seed dispersal: An important determinant of grassland invasion
Spatial and temporal patterns of seed dispersal: An important determinant of grassland invasion
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DOI：
10.1890/06-0610
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发表时间：
2007-03-01
影响因子：
5
通讯作者：
D'Antonio, Carla M.
中科院分区：
文献类型：
--
作者：
DiVittorio, Christopher T.;Corbin, Jeffrey D.;D'Antonio, Carla M.
我们测量了空间和时间格局的种子传播和幼苗补充的58种在草原社区，以测试种子传播是否可以预测模式的入侵后，干扰。对于12个最丰富的草，本地物种的招聘是依赖于本地和外来物种的繁殖体供应。小的空间（1 - 10米）和时间（季节内）尺度上的种子雨的变异导致干扰殖民化的结果，如本地物种占主导地位的干扰时，外来种子供应低，但未能建立时，外来种子供应高的质的差异。物种组成的局部分散和空间异质性通过在本地主导的斑块内建立高外来种子供应的避难所，促进了本地和外来物种的共存。尽管如此，丰富的外来种子生产强烈限制招聘本地物种在外来占主导地位的补丁。目前，加州大部分草原以外来物种为主，这表明幼苗期的竞争是本土物种恢复的主要障碍。
We measured spatial and temporal patterns of seed dispersal and seedling recruitment for 58 species in a grassland community to test whether seed dispersal could predict patterns of invasion after disturbance. For the 12 most abundant grasses, recruitment of native species was dependent on the propagule supply of both native and exotic species. Variability in seed rain on small spatial ( 1 - 10 m) and temporal ( within season) scales led to qualitative differences in the outcome of disturbance colonization such that native species dominated disturbances when exotic seed supply was low but failed to establish when exotic seed supply was high. Local dispersal and spatial heterogeneity in species composition promoted coexistence of native and exotic species by creating refuges from high exotic seed supply within native dominated patches. Despite this, copious exotic seed production strongly limited recruitment of native species in exotic dominated patches. Most grasslands in California are presently dominated by exotic species, suggesting that competition at the seedling stage is a major barrier to native species restoration.