Limited contributions of plant pathogens to density‐dependent seedling mortality of mast fruiting Bornean trees,Ecology and Evolution

当前位置： X-MOL 学术 › Ecol. Evol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Limited contributions of plant pathogens to density‐dependent seedling mortality of mast fruiting Bornean trees
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-10-25 , DOI: 10.1002/ece3.6906
Patrick G Cannon ₁ , Michael J O'Brien _{2,

3} , Kalsum M Yusah ₄ , David P Edwards ₁ , Robert P Freckleton ₁

Affiliation

Fungal pathogens are implicated in driving tropical plant diversity by facilitating strong, negative density‐dependent mortality of conspecific seedlings (C‐NDD). Assessment of the role of fungal pathogens in mediating coexistence derives from relatively few tree species and predominantly the Neotropics, limiting our understanding of their role in maintaining hyper‐diversity in many tropical forests. A key question is whether fungal pathogen‐mediated C‐NDD seedling mortality is ubiquitous across diverse plant communities. Using a manipulative shadehouse experiment, we tested the role of fungal pathogens in mediating C‐NDD seedling mortality of eight mast fruiting Bornean trees, typical of the species‐rich forests of South East Asia. We demonstrate species‐specific responses of seedlings to fungicide and density treatments, generating weak negative density‐dependent mortality. Overall seedling mortality was low and likely insufficient to promote overall community diversity. Although conducted in the same way as previous studies, we find little evidence that fungal pathogens play a substantial role in determining patterns of seedling mortality in a SE Asian mast fruiting forest, questioning our understanding of how Janzen‐Connell mechanisms structure the plant communities of this globally important forest type.

中文翻译：

植物病原体对肥大结果婆罗洲树密度依赖性幼苗死亡率的贡献有限

真菌病原体通过促进同种幼苗（C-NDD）的强负密度依赖性死亡率来驱动热带植物多样性。对真菌病原体在介导共存中的作用的评估来自于相对较少的树种，并且主要是新热带树种，这限制了我们对其在维持许多热带森林过度多样性方面的作用的理解。一个关键问题是真菌病原体介导的 C-NDD 幼苗死亡是否在不同的植物群落中普遍存在。通过操作性遮荫室实验，我们测试了真菌病原体在介导八棵肥大结果婆罗洲树（东南亚物种丰富的森林的典型）的 C-NDD 幼苗死亡率中的作用。我们证明了幼苗对杀菌剂和密度处理的物种特异性反应，产生弱负密度依赖性死亡率。总体幼苗死亡率较低，可能不足以促进整体群落多样性。尽管采用与之前研究相同的方式进行，但我们几乎没有发现证据表明真菌病原体在决定东南亚肥大果林幼苗死亡率方面发挥着重要作用，这对我们对 Janzen-Connell 机制如何构建该地区植物群落的理解提出了质疑。全球重要的森林类型。

更新日期：2020-12-03

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11