Wills C, Condit R, Foster R B, Hubbell S P
Department of Biology and Center for Molecular Genetics, University of California, San Diego, CA 92093, USA.
Proc Natl Acad Sci U S A. 1997 Feb 18;94(4):1252-7. doi: 10.1073/pnas.94.4.1252.
Intraspecific density-dependent effects in the Barro Colorado Island (Panama) study area are far stronger, and involve far more species, than previously had been suspected. Significant effects on recruitment, many extremely strong, are seen for 67 out of the 84 most common species in the plot, including the 10 most common. Significant effects on the intrinsic rate of increase are seen in 54 of the 84 species. These effects are far more common than interspecific effects, and are predominantly of the type that should maintain tree diversity. As a result, the more diverse an area in the forest is, the higher is the overall rate of increase of the trees in that area, although sheer crowding has by itself a negative effect. These findings are consistent with, but do not prove, an important role for host-pathogen interactions (defined broadly) in the maintenance of diversity. Ways are suggested by which to test host-pathogen models and competing models.
在巴拿马的巴罗科罗拉多岛研究区域内，种内密度依赖效应比之前所怀疑的要强烈得多，且涉及的物种也多得多。在该样地中84种最常见的物种里，有67种（包括最常见的10种）在补充率方面受到显著影响，其中许多影响极为强烈。在84种物种中有54种在内在增长率方面受到显著影响。这些效应比种间效应更为常见，并且主要是那种应该能维持树木多样性的类型。因此，森林中一个区域的多样性越高，该区域树木的总体增长率就越高，尽管单纯的拥挤本身会产生负面影响。这些发现与宿主 - 病原体相互作用（广义定义）在维持多样性方面的重要作用相符，但并未证明这一点。文中还提出了检验宿主 - 病原体模型和竞争模型的方法。
