Temporal effects of fine sediment deposition on benthic macroinvertebrate community structure, function and biodiversity likely reflects landscape setting.
Temporal effects of fine sediment deposition on benthic macroinvertebrate community structure, function and biodiversity likely reflects landscape setting.
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细沉积物沉积对底栖大型无脊椎动物群落结构、功能和生物多样性的时间影响可能反映了景观环境。
DOI：
10.1016/j.scitotenv.2022.154612
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Mathers KL
中科院分区：
文献类型：
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作者：
Mathers KL
在全球范围内，超细沉积物(颗粒2毫米)的沉积被认为对水生生物多样性具有有害影响。然而，影响往往是模棱两可的，可能反映了景观环境，尽管这一点很少被考虑。为了解决这个问题，我们研究了在前高山(意大利)和低地(英国)环境中，大型无脊椎动物分类学和功能多样性对实验细沉积物堵塞的时间响应。在基质清洁或堵塞的情况下安装定植装置，并对短(7-14天)、中(21-28天)和长(56-63天)时间尺度进行检查。堵塞改变了低地和前高山河流的分类群落组成，改变了前高山河流的功能群落组成。在前高山环境中，嵌套性一直被发现是导致清洁和堵塞的基质之间分类组成差异的主要过程，堵塞的基质形成了一个嵌套的群落。没有优势成分构成的低地分类群落。功能群落组成是由两种环境的嵌套性驱动的，但在前高山河流中占主导地位，可能反映了较低的功能冗余度。被广泛使用的群落丰富度指标(EPT、分类群和功能丰富度)仅在高山前环境中对细颗粒沉积物负荷表现出响应，但对细颗粒沉积物敏感的类群以及一些功能性摄食类群在这两种环境中确实表现出差异。在高山前环境中，随着时间的推移，细微沉积物对几个群落指标的影响增强。虽然需要进一步的研究来证实我们的发现，并将我们的观察扩展到更多的河流和类型，但过度的细微沉积物是影响高山前和低地环境中的大型无脊椎动物群落的普遍应激源。然而，对堵塞作出反应的生物多样性方面在两种景观环境中有所不同，可能反映了更广泛的环境过滤。监测和管理细微沉积物负荷可能需要具体情况的方法，以最大限度地提高生态效益。
Globally, excessive fine sediment (particles <2 mm) deposition is acknowledged to have deleterious effects on aquatic biodiversity. However, the impacts are often equivocal possibly reflecting landscape context, although this is rarely considered. To address this, we examined the temporal response of macroinvertebrate taxonomic and functional diversity to experimental fine sediment clogging in a prealpine (Italy) and lowland setting (UK). Colonisation devices were installedinsituwith either clean or clogged substrates and examined for short (7–14 days), medium (21–28 days) and long (56–63 days) timescales. Clogging resulted in altered taxonomic community composition in both the lowland and prealpine rivers and modified functional community composition in the prealpine river. Nestedness was consistently found to be the dominant process driving differences in taxonomic composition between the clean and clogged substrates in the prealpine environment, with clogged substrates forming a nested community. No dominant component structured lowland taxonomic communities. Functional community composition was driven by nestedness in both environments but was heavily dominant in the case of the prealpine river, possibly reflecting low functional redundancy. Widely employed community richness metrics (EPT, taxa and functional richness) only displayed a response to fine sediment loading in the prealpine environment but taxa characterized as sensitive to fine sediment as well as some functional feeding groups did exhibit differences in both settings. In the prealpine environment, the effects of fine sediment intensified over time for several community metrics. Although further research is required to corroborate our findings and extend our observations across more rivers and typologies, excessive fine sediment is a pervasive stressor affecting macroinvertebrate communities in prealpine and lowland environments. However, the biodiversity facets that responded to clogging differed between the two landscape settings probably reflecting wider environmental filtering. Monitoring and managing fine sediment loading likely requires context specific approaches to maximise ecological benefits.