期刊
ECOLOGY LETTERS
卷 16, 期 8, 页码 995-1003出版社
WILEY
DOI: 10.1111/ele.12130
关键词
Coexistence; community structure; frequency dependence; host specialisation; Janzen-Connell; plant-enemy interactions; species richness; tropical forest
类别
资金
- NSF [DEB 1038678, DEB 1010816]
- Smithsonian Predoctoral Fellowship programme
- Rackham Graduate School
- Lewis and Clark Foundation
- Direct For Biological Sciences
- Division Of Environmental Biology [1010816] Funding Source: National Science Foundation
- Emerging Frontiers
- Direct For Biological Sciences [1038678] Funding Source: National Science Foundation
The Janzen-Connell hypothesis proposes that plant interactions with host-specific antagonists can impair the fitness of locally abundant species and thereby facilitate coexistence. However, insects and pathogens that associate with multiple hosts may mediate exclusion rather than coexistence. We employ a simulation model to examine the effect of enemy host breadth on plant species richness and defence community structure, and to assess expected diversity maintenance in example systems. Only models in which plant enemy similarity declines rapidly with defence similarity support greater species richness than models of neutral drift. In contrast, a wide range of enemy host breadths result in spatial dispersion of defence traits, at both landscape and local scales, indicating that enemy-mediated competition may increase defence-trait diversity without enhancing species richness. Nevertheless, insect and pathogen host associations in Panama and Papua New Guinea demonstrate a potential to enhance plant species richness and defence-trait diversity comparable to strictly specialised enemies.
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