Seed predation and patterns of fruit production in Asclepias syriaca L.
Seed predation and patterns of fruit production in Asclepias syriaca L.
复制标题
马利筋 (Asclepias syriaca L.) 的种子捕食和果实生产模式。
作者：
S. Franson;M. Willson
种子捕食与豆荚（和种子）分布模式的关系进行了研究，在五个样本的普通马利筋（马利筋syriaca L.），在植物内部和植物之间的“资源集中”效应的测试中。豆荚的比例在一个集群中的攻击，特别是象鼻虫Rackomatus lineticollis，是不一致的集群中包含的豆荚的数量，在人口中的集群大小的频率，或在干集群大小的方差。在一个样品中，每茎被攻击的豆荚比例与茎密度无关，在任何样品中与茎高无关。大集群的豆荚产生更多的未损坏的豆荚，并通过这种措施，比小集群更成功，但没有任何趋势，在任何人口的茎更频繁地产生更成功的集群大小。茎产生更多的豆荚簇也产生更多的未受损的豆荚。我们没有发现任何证据表明，象鼻虫捕食的豆荚之间的集群在一个干的分配的调节。
Seed predation in relation to patterns of pod (and seed) distribution was examined in five samples of the common milkweed (Asclepias syriaca L.), in tests of the “resource-concentration” effect both within- and beween-plants. The proportion of pods in a cluster that were attacked, particularly by the weevil Rhyssomatus lineaticollis, was not consistently related to the number of pods contained in a cluster, the frequency of cluster sizes in a population, or the variance of cluster sizes on a stem. Proportions of pods attacked per stem were not correlated with stem density in one sample and were not associated with stem height in any sample. Large clusters of pods produced more undamaged pods and, by this measure, were more successful than smaller clusters, but there was no tendency in any population for stems to produce the more successful cluster sizes more frequently. Stems producing more clusters of pods also produced more undamaged pods. We found no evidence that weevil predation contributed to the regulation of the distribution of pods among clusters on a stem.