Post-dispersal removal of seeds of pioneer species from five Panamanian forests
Post-dispersal removal of seeds of pioneer species from five Panamanian forests
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DOI：
10.1017/s026646740400197x
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发表时间：
2005-01-01
影响因子：
1.4
通讯作者：
Dalling, JW
中科院分区：
文献类型：
--
作者：
Fornara, DA;Dalling, JW
森林环境和生物条件的变化可能强烈影响种子命运，对植物物种的丰富度和分布产生重要影响。本文研究了6种先锋种（Cecropia peltata, Miconia argentea, Luchea seemannii）的传播后种子去除率。Trenia microntha。在巴拿马不同海拔（0-1100米）和季节（0-4个月旱季）的5个地点的土壤表面发现了青花楹（Apeiba aspera）和紫花楹（jacaranda copaia）。我们比较了1月和6月放置在脊椎动物封闭区、无脊椎动物封闭区和无保护对照区的洗净种子的去除率。总体而言，不同地点未保护种子的去除率相似。几乎所有的种子清除都可归因于两个亚科（金蚁亚科和蓬蚁亚科）的落叶蚁。在低地和山地森林中，无脊椎动物的封育对树木的清除几乎没有影响，而脊椎动物的封育对树木的清除没有影响。4种动物分散种的种子去除率较高（平均45%，在2 d内被清除），而2种风分散种的种子去除率基本不变（平均2%，被清除）。这些结果表明，种子的传播特征，而不是地点特征，可能是先驱者传播后种子命运的最强决定因素。
Variation among forests in environmental and biotic conditions may strongly influence seed fate with important consequences for the abundance and distribution of plant species. Here we examine the post-dispersal seed removal rates of six pioneer species (Cecropia peltata, Miconia argentea, Luchea seemannii. Trenia microntha. Apeiba aspera and jacaranda copaia) from the soil surface at five sites in Panama varying in elevation (0-1100 m) and seasonality (0-4 mo dry season). We compared removal rates of washed seeds placed in vertebrate exclosures, invertebrate exclosures, and unprotected controls in January and June. Overall, removal rates of unprotected seeds were similar among sites. Almost all seed removal could be attributed to litter ants in two subfamilies (Myrmicinae and Ponerinae). Little or no removal was recorded from invertebrate exclosures while vertebrate exclosures had no effect on removal either in lowland and montane forests. Seed removal rates were high for four animal-dispersed species (mean 45%, removed over 2 d), whereas two wind-dispersed species were largely untouched (mean 2%, removed). These results indicate that seed dispersal characteristics, rather than site characteristics, may be the strongest determinant of the post-dispersal seed fate of pioneers.