The influence of hydrology and sediment grain-size on the spatial distribution of macroinvertebrate communities in two submerged dunes from the Danube Delta (Romania)

IF 1.2 4区环境科学与生态学 Q4 LIMNOLOGY

Limnetica Pub Date : 2022-01-15 DOI:10.23818/limn.41.07

O. Pacioglu, F. Duţu, A. Pavel, Laura Tiron Duţu

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引用次数: 5

Abstract

The influence of hydrology and sediment grain-size on the spatial distribution of macroinvertebrate communities in two submerged dunes from the Danube Delta (Romania) The present study focused on the ecological preferences of benthic macroinvertebrates regarding water flow and sediment characteristics in two submerged dunes from Danube Delta (Romania). Three hydraulic microhabitats, the stoss, trough and crest areas were sampled, along with measurements of water hydraulics, hydrology, sediment grain-size, and organic content. The results showed that the slope angles between stoss-crest and crest-trough areas are crucial in modulating local flows, sediment structure, organic content, macroinvertebrate communities, and taxonomic richness and density. As such, the stoss microhabitats are considered zones with the highest turbulence, hence driving low taxonomic richness and density compared to crest and trough microhabitats. When local environmental conditions in trough microhabitats allow the accretion of fine and organically enriched sediments, the development of maximum density for certain macroinvertebrates groups is reached. However, the benthic assemblages did not show clear preferences for certain microhabitats, suggesting ubiquitous ecologic traits, crucial for the successful colonisation of dynamic habitats, such as the submerged dunes in large rivers. The results of this study offer a better understanding on the abiotic factors driving the spatial preferences, density, and diversity of benthic macroinvertebrates in these understudied hydrogeomorphological units from large rivers.

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水文和泥沙粒度对罗马尼亚多瑙河三角洲两个淹没沙丘大型无脊椎动物群落空间分布的影响

水文和沉积物粒度对多瑙河三角洲两个淹没沙丘中大型无脊椎动物群落空间分布的影响（罗马尼亚）本研究重点关注了多瑙河三角三角洲（罗马尼亚）两个浸没沙丘中底栖大型无脊椎动物对水流和沉积物特征的生态偏好。对三个水力学微生境，即洼地、槽区和坡顶区进行了采样，并对水力学、水文、沉积物粒度和有机物含量进行了测量。结果表明，沙脊和沙槽区域之间的坡度角对调节局部流量、沉积物结构、有机质含量、大型无脊椎动物群落以及分类学丰富度和密度至关重要。因此，与波峰和波谷微栖息地相比，干燥的微栖息地被认为是湍流最高的区域，因此导致分类丰富度和密度较低。当槽微栖息地的当地环境条件允许精细和有机富集的沉积物堆积时，某些大型无脊椎动物群的密度达到最大。然而，底栖生物群落并没有表现出对某些微栖息地的明确偏好，这表明了普遍存在的生态特征，这对动态栖息地的成功定居至关重要，例如大型河流中的淹没沙丘。这项研究的结果提供了对驱动大型河流中这些研究不足的水文地貌单元中底栖大型无脊椎动物的空间偏好、密度和多样性的非生物因素的更好理解。

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来源期刊

Limnetica LIMNOLOGY-MARINE & FRESHWATER BIOLOGY

CiteScore

3.70

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： Limnetica publishes original research articles on the ecology of inland waters. The scope of Limnetica includes the ecology of rivers, lakes, reservoirs, coastal lagoons and wetlands, as well as biogeochemistry, paleolimnology, development of new methodologies, taxonomy, biogeography and any aspect of theoretical and applied continental aquatic ecology such as management and conservation, impact assessment, ecotoxicology and pollution. Limnetica will accept for its publication scientific articles presenting advances in knowledge or technological development, as well as as papers derived from new practical approaches on the topics covered by the journal.