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首页> 外文期刊>Marine ecology progress series >Response of benthic assemblages to multiple stressors: comparative effects of nutrient enrichment and physical disturbance
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Response of benthic assemblages to multiple stressors: comparative effects of nutrient enrichment and physical disturbance

机译：底栖组合对多种胁迫的响应：营养富集和身体干扰的比较作用

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摘要

Stressors to ecological communities often overlap in time and space and may have additive, synergistic or antagonistic effects. Nutrient enrichment and physical disturbance are 2 commonly co-occurring stressors to estuarine ecosystems, but their combined effects have mainly been investigated in mesocosm experiments of unknown relevance to field scenarios. Here, the interacting effects of these 2 stressors were examined at 2 field locations (Botany Bay and Lane Cove, New South Wales, Australia) using a fully orthogonal manipulative experiment. All possible combinations of zero, low and high intensities of nutrient enrichment and physical disturbance on macrofaunal and microphytobenthic communities were examined. Effects of stressors were generally site-specific and additive, differing in terms of magnitude of effects, although some idiosyncratic interactive effects were demonstrated for selected species. Where effects of stressors were observed, nutrient enrichment generally increased microphytobenthic biomass and altered the macrofaunal community structure while physical disturbance produced limited impacts. The divergent results of this and previous mesocosm experiments, which found primarily interactive effects of the stressors, highlights the importance of undertaking field experiments that offer a greater element of realism. Furthermore, this study, in finding differing responses to stressors at the 2 sites, highlights the importance of environmental context in mediating effects.
机译：生态社区的压力源经常在时间和空间上重叠，并且可能具有累加，协同或拮抗作用。营养丰富和物理干扰是河口生态系统中两个常见的共同压力源，但主要是在与田间情况不相关的中观试验中研究了它们的综合作用。在这里，使用完全正交的操纵实验，在2个现场位置（Botany Bay和Lane Cove，新南威尔士州，澳大利亚）检查了这2个压力源的相互作用。检验了大型，底栖动物群落中养分富集强度的零，低和高强度的所有可能组合以及物理扰动。应激源的影响通常是针对特定地点的，并且是累加的，尽管影响程度不同，但对于选定的物种却表现出一些特有的交互作用。在观察到压力源影响的地方，养分富集通常会增加微底栖生物量并改变大型动物群落结构，而物理干扰产生的影响则有限。本次和以前的介观实验的结果不一致，主要发现了压力源的交互作用，突出了进行现场实验的重要性，该实验提供了更大的真实感。此外，本研究在两个地点发现对压力源的不同反应时，强调了环境背景在介导作用中的重要性。

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