...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Forest fragmentation severs mutualism between seed dispersers and an endemic African tree
【24h】

Forest fragmentation severs mutualism between seed dispersers and an endemic African tree

机译：森林破碎化分裂了种子分散器和非洲特有树种之间的共生关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Because bird species are lost when forests are fragmented into small parcels, trees that depend on fruit-eating birds for seed dispersal may fail to recruit seedlings if dispersal agents disappear. We tested this prediction in rainforest in the East Usambara Mountains of Tanzania, by using the endemic tree Leptonychia usambarensis (Sterculiaceae) and birds that disperse its seeds. We investigated bird abundance and Leptonychia dispersal ecology in fragments isolated for >70 yr, as compared with 3,500 ha of continuous forest. Birds that dispersed Leptonychia seeds in continuous forest were rare or absent in small fragments, where fewer seeds were removed from each tree, far fewer seedlings occurred >10 m from parent trees, and far more seedlings occurred in dense aggregations under parental crowns. Overall, our samples showed that fewer juvenile Leptonychia recruited in fragments than in continuous forest. We provide solid evidence that deficient dispersal due to habitat fragmentation seriously impacts the reproductive cycle of a tropical bird-dispersed tree.
机译：因为当森林被分割成小块时，鸟类的物种会流失，如果散播剂消失，依靠吃水果的鸟进行种子传播的树木可能无法招募幼苗。我们通过使用特有树Leptonychia usambarensis（Sterculiaceae）和散布其种子的鸟类在坦桑尼亚东部Usambara山区的雨林中测试了这一预测。我们调查了隔离期大于70年的鸟类的鸟类丰度和鸭嘴兽的扩散生态，而连续森林为3500公顷。在连续森林中散布有细支气管甲虫种子的鸟类很少或没有小碎片，每棵树上除去的种子较少，离亲本树> 10 m的幼苗少得多，而在亲本冠下的密集聚集体中出现的树苗也更多。总体而言，我们的样本显示，碎片中招募的少年Leptonychia比连续森林中招募的少。我们提供有力的证据表明，由于栖息地破碎而造成的分散不足严重影响了热带鸟类分散树的繁殖周期。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号