Partitioning the effects of algal species identity and richness on benthic marine primary production
Partitioning the effects of algal species identity and richness on benthic marine primary production
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DOI：
10.1111/j.2006.0030-1299.14927.x
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发表时间：
2006-10-01
期刊：
影响因子：
3.4
通讯作者：
Duffy, J. Emmett
中科院分区：
文献类型：
--
作者：
Bruno, John F.;Lee, Sarah C.;Duffy, J. Emmett
在陆地生境中有影响力的研究表明，一些生态系统过程与植物生物多样性有关，但这些联系在海洋生态系统中的研究仍然很少。我们进行了一个领域和一个围隔实验，以量化的相对影响，大型藻类物种的身份和丰富度的珊瑚礁大型藻类群落的牙买加北海岸的初级生产。我们测量生产的藻类生物量的净积累，在没有消费者和光合速率使用氧探头在密封的水族箱。我们使用了两个最近开发的技术，属性偏差预期相对产量与物种身份或多样性的组件，然后进一步分区多样性的基础上的优势，性状依赖的互补性和性状独立的互补性的机械组件的影响。我们的研究结果表明，藻类身份有更大的影响绝对净增长和光合作用比丰富度。最多样化的混合物的大型藻类并没有超过最富有成效的单一或平均单一的初级生产措施（即我们没有发现证据，无论是海侵或非海侵丰产）。性状独立互补效应为正，显性互补效应和性状依赖互补效应均为负，且随丰富度的增加而增强。因此，物种间的相互作用和生态位划分对生产的潜在积极影响被显性和其他负面选择效应所否定。这些结果表明，组分效应的抵消作用可以减小净丰度对产量的影响。这可以解释在其他水生和陆地系统中经常观察到的弱净丰富度效应，并表明生活史权衡大大降低了生态相关植物生物多样性对生态系统特性的潜在影响。
Influential research in terrestrial habitats indicates that several ecosystem processes are related to plant biodiversity, yet these links remain poorly studied in marine ecosystems. We conducted one field and one mesocosm experiment to quantify the relative effects of macroalgal species identity and richness on primary production in coral reef macroalgal communities off the north coast of Jamaica. We measured production as the net accumulation of algal biomass in the absence of consumers and as photosynthetic rate using oxygen probes in sealed aquaria. We used two recently developed techniques to attribute deviations in expected relative yield to components associated with species identity or diversity and then to further partition diversity effects into mechanistic components based on dominance, trait-dependent complementarity, and trait-independent complementarity. Our results indicate that algal identity had far greater effects on absolute net growth and photosynthesis than richness. The most diverse mixture of macroalgae did not outperform the most productive monoculture or the average monoculture in either measure of primary production (i.e. we did not find evidence of either transgressive or non-transgressive overyielding). Trait-independent complementarity effects were positive but dominance and trait-dependent complementarity were both negative and became stronger when richness was increased. Thus the potentially positive influence of species interactions and niche partitioning on production were negated by dominance and other negative selection effects. These results demonstrate that the counteracting influence of component effects can diminish the net richness effects on production. This could explain frequently observed weak net richness effects in other aquatic and terrestrial systems and suggests that life history tradeoffs greatly reduce the potential for ecologically relevant plant biodiversity effects on ecosystem properties.