Community assembly and invasion: An experimental test of neutral versus niche processes
Community assembly and invasion: An experimental test of neutral versus niche processes
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DOI：
10.1073/pnas.1033107100
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发表时间：
2003-07-22
影响因子：
11.1
通讯作者：
Tilman, D
中科院分区：
文献类型：
--
作者：
Fargione, J;Brown, CS;Tilman, D
一个物种陷入困境的实验表明，草原草原具有一个结构化的非中性装配过程，在该过程中，居民物种通过资源消耗抑制具有相似资源使用模式的物种的建立和增长，其中入侵者的成功随着多样性的增加而降低。在我们的实验中，将四个功能性公会的每个物种（作为种子）引入了147个草原 - 格拉斯兰地块，这些土地以前已被建立和维持为具有不同的组成和多样性。建立的物种最强烈抑制了自己的功能公会引入的物种。当功能相似的物种丰富并且确定物种留下较低水平的资源时，引入的物种获得了较低的丰度，这是在较低的物种丰富度处发生的。 C4草官能公会的居民是附近本地草原的主要行会，将主要的限制资源（土壤硝酸盐）降低到仲夏的最低水平，并对引入的物种表现出最大的抑制作用。从理论上讲，这种与已建立的丰富物种相似的竞争性抑制的简单机制可以解释植物群落中观察到的许多模式。
A species-addition experiment showed that prairie grasslands have a structured, nonneutral assembly process in which resident species inhibit, via resource consumption, the establishment and growth of species with similar resource use patterns and in which the success of invaders decreases as diversity increases. In our experiment, species in each of four functional guilds were introduced, as seed, into 147 prairie-grassland plots that previously had been established and maintained to have different compositions and diversities. Established species most strongly inhibited introduced species from their own functional guild. introduced species attained lower abundances when functionally similar species were abundant and when established species left lower levels of resources unconsumed, which occurred at lower species richness. Residents of the C4 grass functional guild, the dominant guild in nearby native grasslands, reduced the major limiting resource, soil nitrate, to the lowest levels in midsummer and exhibited the greatest inhibitory effect on introduced species. This simple mechanism of greater competitive inhibition of invaders that are similar to established abundant species could, in theory, explain many of the patterns observed in plant communities.