Effects of total resources, resource ratios, and species richness on algal productivity and evenness at both metacommunity and local scales.
Effects of total resources, resource ratios, and species richness on algal productivity and evenness at both metacommunity and local scales.
复制标题
DOI：
10.1371/journal.pone.0021972
复制
发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Hillebrand H
中科院分区：
文献类型：
--
作者：
Gamfeldt L;Hillebrand H
生产力与生物多样性之间相互关系的研究是生态学的一个主要研究领域。理论预测，如果重要资源在元群落中异质分布，则单一物种可能会主导各个元群落斑块的生产力，但物种的混合将使整个元群落的生产力最大化。它还预测，当地斑块内资源的平衡供应应有利于物种共存，而资源不平衡则有利于某一物种的优势。我们对五种淡水藻类进行了实验，以研究资源总供应、其比例和物种丰富度对局部斑块和元群落规模的生物量生产和均匀度的影响。一般来说，藻类生物量增加，而藻类资源利用效率（RUE）和均匀度随着包含所有五个物种的混合群落的资源总供应量的增加而下降。与生物量生产的预测相反，在元群落规模上，物种混合物的表现并未优于所有单一栽培。换句话说，我们没有观察到普遍的海侵过度屈服。然而，混合栽培的 RUE 始终高于单一栽培的预测，并且分析表明，混合栽培中的资源分配或便利化导致在高资源供应的情况下生产率高于预期。与我们对当地规模的预测相比，资源的平衡供应通常不利于较高的当地均匀度，但最低的均匀度仅限于供应最不平衡的斑块。因此，我们的研究为理解生物多样性与生产力关系的最新理论进展提供了混合支持。
The study of the interrelationship between productivity and biodiversity is a major research field in ecology. Theory predicts that if essential resources are heterogeneously distributed across a metacommunity, single species may dominate productivity in individual metacommunity patches, but a mixture of species will maximize productivity across the whole metacommunity. It also predicts that a balanced supply of resources within local patches should favor species coexistence, whereas resource imbalance would favor the dominance of one species. We performed an experiment with five freshwater algal species to study the effects of total supply of resources, their ratios, and species richness on biovolume production and evenness at the scale of both local patches and metacommunities. Generally, algal biovolume increased, whereas algal resource use efficiency (RUE) and evenness decreased with increasing total supply of resources in mixed communities containing all five species. In contrast to predictions for biovolume production, the species mixtures did not outperform all monocultures at the scale of metacommunities. In other words, we observed no general transgressive overyielding. However, RUE was always higher in mixtures than predicted from monocultures, and analyses indicate that resource partitioning or facilitation in mixtures resulted in higher-than-expected productivity at high resource supply. Contrasting our predictions for the local scale, balanced supply of resources did not generally favor higher local evenness, however lowest evenness was confined to patches with the most imbalanced supply. Thus, our study provides mixed support for recent theoretical advancements to understand biodiversity-productivity relationships.
登录
查看更多内容
影响因子：
4.8
作者：
ABRAMS, PA
通讯作者：
ABRAMS, PA
影响因子：
8.8
作者：
Bruno, JF;Boyer, KE;Kertesz, JS
通讯作者：
Kertesz, JS
影响因子：
3.7
作者：
Langenheder S;Bulling MT;Solan M;Prosser JI
通讯作者：
Prosser JI
影响因子：
3.4
作者：
Griffin, John N.;Jenkins, Stuart R.;Thompson, Richard C.
通讯作者：
Thompson, Richard C.
DOI：
10.1073/pnas.0701918104
发表时间：
2007-06-26
影响因子：
11.1
作者：
Hillebrand, Helmut;Gruner, Daniel S.;Smith, Jennifer E.
通讯作者：
Smith, Jennifer E.