Seed-dispersal distributions by trumpeter hornbills in fragmented landscapes
Seed-dispersal distributions by trumpeter hornbills in fragmented landscapes
复制标题
DOI：
10.1098/rspb.2010.2383
复制
发表时间：
2011-08-07
影响因子：
4.7
通讯作者：
Boehning-Gaese, Katrin
中科院分区：
文献类型：
--
作者：
Lenz, Johanna;Fiedler, Wolfgang;Boehning-Gaese, Katrin
食果鸟类通过运输肉质果实植物的种子提供重要的生态系统服务。据推测，这些动物产生的种子传播内核一般是leptokurtic，导致栖息地片段之间的分散。然而，鲜为人知的是，种子传播分布所产生的大型食果鸟类在破碎的景观。我们调查了运动和种子传播模式的喇叭犀鸟（Bycanistes bucinator）在南非的一个破碎的景观。新型全球定位系统记录仪提供高质量的位置数据，而不会对记录长距离移动产生偏见。我们发现了一个非常弱的双峰种子扩散分布与潜在的扩散距离可达14.5公里。林内种子扩散呈单峰型分布，平均扩散距离为86 m。在破碎的农业景观中，分布呈强烈的双峰，峰值在18和512米处。我们的研究结果表明，种子传播分布不同的鸟类在不同的栖息地类型。种子分散距离在破碎的景观表明，栖息地补丁之间的运输比以前假设的更频繁，使植物分散在栖息地补丁，并跟踪不断变化的气候条件。
Frugivorous birds provide important ecosystem services by transporting seeds of fleshy fruited plants. It has been assumed that seed-dispersal kernels generated by these animals are generally leptokurtic, resulting in little dispersal among habitat fragments. However, little is known about the seed-dispersal distribution generated by large frugivorous birds in fragmented landscapes. We investigated movement and seed-dispersal patterns of trumpeter hornbills (Bycanistes bucinator) in a fragmented landscape in South Africa. Novel GPS loggers provide high-quality location data without bias against recording long-distance movements. We found a very weakly bimodal seed-dispersal distribution with potential dispersal distances up to 14.5 km. Within forest, the seed-dispersal distribution was unimodal with an expected dispersal distance of 86 m. In the fragmented agricultural landscape, the distribution was strongly bimodal with peaks at 18 and 512 m. Our results demonstrate that seed-dispersal distributions differed when birds moved in different habitat types. Seed-dispersal distances in fragmented landscapes show that transport among habitat patches is more frequent than previously assumed, allowing plants to disperse among habitat patches and to track the changing climatic conditions.