Patterns of host use in two African mistletoes: the importance of mistletoe–host compatibility and avian disperser behaviour
Patterns of host use in two African mistletoes: the importance of mistletoe–host compatibility and avian disperser behaviour
复制标题
两种非洲槲寄生的寄主利用模式：槲寄生与寄主相容性和鸟类传播行为的重要性
DOI：
10.1111/j.1365-2435.2005.01036.x
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发表时间：
2005
影响因子：
5.2
通讯作者：
S. Nicolson
中科院分区：
文献类型：
--
作者：
L. Roxburgh;S. Nicolson
总结
1槲寄生感染流行率在宿主树种之间通常不同。宿主之间感染流行率的差异可能是槲寄生-宿主相容性和传播者在该宿主上的种子沉积频率的产物。
2我们记录了两种槲寄生，Phragmanthera dschallensis Engl.和卡拉恰里褶萼（PlicosepaluskalachariensisSchinz）在不同寄主上的差异。然后，我们测试的重要性，槲寄生宿主相容性机制和分散剂的喜好，在确定不同的宿主物种之间的感染流行模式。
3槲寄生与寄主的亲和性通过槲寄生种子在不同寄主上的种植，并在种植后1年内记录种子的萌发和定植情况。不同寄主间种子萌发率差异不显著，但幼苗存活率差异显著。然而，幼苗存活率与宿主之间的感染率不相关。
4通过观察鸟类对槲寄生果实的传播，计算了传播者的偏好。传播者访问树木的持续时间和频率更大的寄生树。传播者没有访问unparasitized树木的比例，他们的丰富，但表现出对某些树种的偏好。传播者对树木的偏好与感染率相关。
5槲寄生-宿主相容性机制不能解释本研究中宿主间的流行模式。与此相反，传播者的喜好有关的流行槲寄生感染不同的宿主树种。
Summary
1Mistletoe infection prevalence typically differs between host tree species. Differences in infection prevalence between hosts are probably the product of mistletoe–host compatibility and frequency of seed deposition on that host by dispersers.
2We recorded patterns of infection prevalence of two mistletoes, Phragmanthera dschallensis Engl. and Plicosepalus kalachariensis Schinz (Loranthaceae), on different host species. We then tested the importance of mistletoe–host compatibility mechanisms and disperser preferences in determining infection prevalence patterns among different host species.
3Mistletoe–host compatibility was tested by planting mistletoe seeds on different hosts and recording germination and establishment up to 1 year after planting. There were no significant differences in seed germination, but seedling survival was significantly different among hosts. However, seedling survival was not correlated with infection prevalence among hosts.
4Disperser preferences were calculated from observations of birds that disperse mistletoe fruits. Both the duration and frequency of disperser visits to trees were greater among parasitized trees. Dispersers did not visit unparasitized trees in proportion to their abundance, but showed preferences for certain tree species. Disperser preferences for trees were correlated with infection prevalence.
5Mistletoe–host compatibility mechanisms could not explain patterns of prevalence among hosts in this study. In contrast, disperser preferences were related to prevalence of mistletoe infections among different host tree species.