Fukami Tadashi, Morin Peter J
Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee 37996-1610, USA.
Nature. 2003 Jul 24;424(6947):423-6. doi: 10.1038/nature01785.
Identification of the causes of productivity-species diversity relationships remains a central topic of ecological research. Different relations have been attributed to the influence of disturbance, consumers, niche specialization and spatial scale. One unexplored cause is the history of community assembly, the partly stochastic sequential arrival of species from a regional pool of potential community members. The sequence of species arrival can greatly affect community structure. If assembly sequence interacts with productivity to influence diversity, different sequences can contribute to variation in productivity-diversity relationships. Here we report a test of this hypothesis by assembling aquatic microbial communities at five productivity levels using four assembly sequences. About 30 generations after assembly, productivity-diversity relationships took various forms, including a positive, a hump-shaped, a U-shaped and a non-significant pattern, depending on assembly sequence. This variation resulted from idiosyncratic joint effects of assembly sequence, productivity and species identity on species abundances. We suggest that the history of community assembly should be added to the growing list of factors that influence productivity-biodiversity patterns.
确定生产力与物种多样性关系的成因仍然是生态学研究的核心课题。不同的关系被归因于干扰、消费者、生态位专业化和空间尺度的影响。一个未被探索的原因是群落组建的历史，即物种从潜在群落成员的区域库中部分随机地依次到达。物种到达的顺序会极大地影响群落结构。如果组建顺序与生产力相互作用以影响多样性，不同的顺序会导致生产力 - 多样性关系的变化。在这里，我们通过使用四种组建顺序在五个生产力水平上组建水生微生物群落来检验这一假设。组建后约30代，生产力 - 多样性关系呈现出各种形式，包括正相关、驼峰形、U形和无显著关系的模式，这取决于组建顺序。这种变化是由组建顺序、生产力和物种身份对物种丰度的特殊联合效应导致的。我们建议，群落组建的历史应被添加到影响生产力 - 生物多样性模式的不断增加的因素列表中。
