Role of dispersal in the recruitment limitation of neotropical pioneer species
Role of dispersal in the recruitment limitation of neotropical pioneer species
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DOI：
10.1046/j.1365-2745.2002.00706.x
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发表时间：
2002-08-01
影响因子：
5.5
通讯作者：
Hubbell, SP
中科院分区：
文献类型：
--
作者：
Dalling, JW;Muller-Landau, HC;Hubbell, SP
1我们研究了种子传播在预测巴拿马巴罗科罗拉多岛(BCI)一块林地最近林隙中先锋苗木组成的重要性。我们从13年来收集的200个网状捕捉器的种子雨数据中描述了13个分类群的种子传播，并从一年中收集的土壤样本中描述了另一个物种的萌发。我们描述了这14个分类群在36个树隙中所有苗木的完整普查的苗木分布模式。2最大似然模型考虑了到成年树的距离和树的大小，对所有类群的种子雨与诱捕器进行了很好的拟合。3预测每个树隙的苗木招募数量的能力在不同的类群中差异很大。对于14个分类群中的8个，包含预测种子雨的回归模型比假设所有地点的更新概率恒定的模型显著地更好地预测苗木更新。4为了了解局部扩散格局的变化是否决定了林隙的群落组成，我们检查了这14个先锋分类群在36个林隙中的相对丰富度。我们发现，在36个林隙中，有27个林隙的分类群丰度与种子传播模型和种子-幼苗回归预测的丰度显著正相关。5总体而言，我们发现有证据表明，有限的种子传播是影响林隙中苗木分布格局的一个重要因素，以及影响扩散后招募成功的因素。
1 We examined the importance of seed dispersal in predicting the pioneer seedling composition in recent gaps in a forest plot on Barro Colorado Island (BCI), Panama. We characterize seed dispersal for 13 taxa from seed rain data collected over 13 years in 200 mesh traps, and for an additional species from germination from soil samples collected in one year. We describe seedling distribution patterns from a complete census of all seedlings of these 14 taxa present in 36 treefall gaps.2 A maximum likelihood model, incorporating both distance to adult trees and tree size, fitted observed seed rain to traps quite well for all taxa.3 The ability to predict seedling recruit number per gap varied greatly among taxa. For 8 of 14 taxa, regression models incorporating predicted seed rain were significantly better predictors of seedling recruitment than models in which recruitment probability was assumed constant in all sites.4 To see if variation in local dispersal patterns determined the community composition of gaps, we examined the relative abundances of these 14 pioneer taxa in the 36 gaps. We found that taxon abundances were significantly positively correlated with abundances predicted from seed dispersal models and seed-seedling regressions for 27 out of 36 gaps.5 Overall, we find evidence that limited seed dispersal is an important factor contributing, together with factors affecting post-dispersal recruitment success, to seedling distribution patterns in gaps.