Impact of biodiversity-climate futures on primary production and metabolism in a model benthic estuarine system
Impact of biodiversity-climate futures on primary production and metabolism in a model benthic estuarine system
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DOI：
10.1186/1472-6785-11-7
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发表时间：
2011-02-14
期刊：
影响因子：
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通讯作者：
Paterson, David M.
中科院分区：
文献类型：
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作者：
Hicks, Natalie;Bulling, Mark T.;Paterson, David M.
背景：了解人为驱动的全球温度、大气二氧化碳和生物多样性变化对海洋生态系统功能的影响，对于预测和管理相关影响至关重要。沿海生态系统是陆架水域碳（初级生产）的重要来源，在全球养分循环中起着至关重要的作用。这些系统特别容易受到人类活动的影响，并将成为受海平面上升影响的首批地区。在这些沿海生态系统中，微藻组合（微底栖植物：MPB）对本地碳固定至关重要。MPB的原位生产水平调节了净异养或自养代谢之间过渡生态系统的净碳循环。在本研究中，我们研究了实验系统中大气CO2浓度升高（337,600和1000 ppmv），温度（6℃，12℃和18℃）和无脊椎动物生物多样性对MPB生物量的交互影响。我们将三种常见的放牧无脊椎动物（Hydrobia ulvae， Corophium volutator和Hediste diversicolor）的群落在单一栽培和所有可能的多物种组合中进行了组合。该实验设计专门研究了选定的气候变化变量与物种组成或丰富度变化引起的任何生态后果之间的相互作用。结果：CO2浓度升高、温度升高和无脊椎动物多样性升高对MPB生物量的影响不是相加的，而是相互作用的，总体上是负的。多样性效应的基础是强大的物种组成效应，说明了物种个体身份的重要性。结论：总体而言，我们的研究结果表明，在自然系统中，变化的环境条件和无脊椎动物组合结构的任何相关变化之间的复杂相互作用可能会减少MPB生物量。此外，这些影响将足以影响沿海生态系统的净代谢平衡，对系统生态学和可持续开发具有重要意义。
Background: Understanding the effects of anthropogenically-driven changes in global temperature, atmospheric carbon dioxide and biodiversity on the functionality of marine ecosystems is crucial for predicting and managing the associated impacts. Coastal ecosystems are important sources of carbon (primary production) to shelf waters and play a vital role in global nutrient cycling. These systems are especially vulnerable to the effects of human activities and will be the first areas impacted by rising sea levels. Within these coastal ecosystems, microalgal assemblages (microphytobenthos: MPB) are vital for autochthonous carbon fixation. The level of in situ production by MPB mediates the net carbon cycling of transitional ecosystems between net heterotrophic or autotrophic metabolism. In this study, we examine the interactive effects of elevated atmospheric CO2 concentrations (370, 600, and 1000 ppmv), temperature (6 degrees C, 12 degrees C, and 18 degrees C) and invertebrate biodiversity on MPB biomass in experimental systems. We assembled communities of three common grazing invertebrates (Hydrobia ulvae, Corophium volutator and Hediste diversicolor) in monoculture and in all possible multispecies combinations. This experimental design specifically addresses interactions between the selected climate change variables and any ecological consequences caused by changes in species composition or richness.Results: The effects of elevated CO2 concentration, temperature and invertebrate diversity were not additive, rather they interacted to determine MPB biomass, and overall this effect was negative. Diversity effects were underpinned by strong species composition effects, illustrating the importance of individual species identity.Conclusions: Overall, our findings suggest that in natural systems, the complex interactions between changing environmental conditions and any associated changes in invertebrate assemblage structure are likely to reduce MPB biomass. Furthermore, these effects would be sufficient to affect the net metabolic balance of the coastal ecosystem, with important implications for system ecology and sustainable exploitation.