Variation in resource consumption across a gradient of increasing intra- and interspecific richness.
Variation in resource consumption across a gradient of increasing intra- and interspecific richness.
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DOI：
10.1890/09-1948.1
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发表时间：
2011-06
期刊：
影响因子：
4.8
通讯作者：
C. Hargrave;K. Hambright;L. Weider
中科院分区：
文献类型：
--
作者：
C. Hargrave;K. Hambright;L. Weider
基于拥有更多物种的生态系统将以更高的效率发挥作用的前提，生物多样性的下降预计将改变地球仪的重要生态系统功能、商品和服务。然而，这一一般假设的遗传或克隆丰富度组成的几个物种的组合的适用性研究不足。这说明有必要将生物多样性生态系统功能实验的重点扩大到所有生物多样性层面（包括遗传层面）。为了探索这种普遍性，我们操纵种内（克隆）和种间（物种）丰富的主要消费者，水蚤，并测量组合摄食率和总资源消耗。我们的研究结果表明，更大的克隆丰富度对水蚤摄食没有影响，更大的物种丰富度降低了水蚤的摄食相关效应。这表明，多克隆水蚤组合可能不会更有效地消耗资源比单一的，单一的水蚤可能会消耗资源更有效地比物种丰富的组合。在这项研究中观察到的增加丰富的抑制作用，导致化学和机械干扰之间的一些水蚤类群。这表明，消费者介导的生态系统功能可能会减少组合时，包括类群配备干扰竞争的适应。
Based on the premise that ecosystems with more species will function at more efficient rates, declining biodiversity is expected to alter important ecosystem functions, goods, and services across the globe. However, applicability of this general hypothesis to genetic or clonal richness in assemblages composed of few species is understudied. This illustrates the need to expand the focus of biodiversity-ecosystem-function experiments across all levels of biological diversity (including genetic). To explore this generality, we manipulated intraspecific (clonal) and interspecific (species) richness of a primary consumer, Daphnia, and measured assemblage feeding rate and total resource consumption. Our results showed that greater clonal richness had no effect on Daphnia feeding, and greater species richness decreased feeding-related effects of Daphnia. This suggests that multiclonal Daphnia assemblages may be no more efficient at consuming resources than monocultures, and that monocultures of Daphnia may consume resources more efficiently than more species-rich assemblages. The inhibitory effect of increasing richness observed in this study resulted from chemical and mechanical interference among some of the Daphnia taxa. This suggests that consumer-mediated ecosystem functions could be reduced when assemblages include taxa equipped with adaptations for interference competition.