Arctic meiofauna and nematodes were examined at 12 stations in the East Siberian Sea, covering a depth range of 13-59 m and an estuarine-shelf system from the Indigirka and Kolyma rivers to the adjacent shelf. Our data reveal the low diversity of the meiofauna at the East Siberian Sea shelf. The meiobenthos abundance was influenced by river run-off and the sea bottom landscape. The samples comprised a total of 28 families and 72 genera, and the number of genera per station ranged from 15 to 32. The Comesomatidae was the dominant family with genus Sabatieria. Among all factors, depth, water temperature and the total organic carbon appeared to be important variables explaining spatial variations in meiofauna and nematodes abundance. Depth and river run-off were defining in controlling the density of nematodes in the study area.
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http://dx.doi.org/10.1038/s41598-021-98641-1 | DOI Listing |
Chemosphere
February 2025
ID-Gene Ecodiagnostics, Chemin Du Pont-du-Centenaire 109, 1228, Plan-les-Ouates, Switzerland; Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712, Sopot, Poland. Electronic address:
Nematodes are the most diverse and dominant group of marine meiofauna with high potential as bioindicators of the ecological quality status (EcoQS). The present study explores, for the first time, the applicability of the nematode metabarcoding to infer EcoQS index based on the calibration of ecological behaviors of nematodes Amplicon Sequence Variants (ASVs). To achieve this, we analyzed the nematode community in sediment eDNA samples collected in 2018 and 2021 in areas around three offshore oil platforms in the Danish west coast of the North Sea.
View Article and Find Full Text PDFTurbidity flows can transport massive amounts of sediment across large distances with dramatic, long-lasting impacts on deep-sea benthic communities. The 2016 M 7.8 Kaikōura Earthquake triggered a canyon-flushing event in Kaikōura Canyon, New Zealand, which included significant submarine mass wasting, debris, and turbidity flows.
View Article and Find Full Text PDFMar Pollut Bull
December 2024
Institute of Fisheries Science, National Taiwan University, Taipei, Taiwan. Electronic address:
The volcanic island, Kueishan Island, harbors two unique shallow-water ecosystems: hydrothermal vents and coral communities. The unique geologic features render the island an ideal place as a spectrum for studying two different ecosystems and mimicking the impacts of climate change on coral reef biota in the future. However, little is known about the meiofauna community there.
View Article and Find Full Text PDFSci Total Environ
December 2024
Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France. Electronic address:
Marshes are wetlands known for providing major ecosystem services in terms of water quality and human activities. These ecosystem services are mainly provided by marshes' benthic community, composed of prokaryotes (bacteria and archaea) but also of eukaryotes (micro-eukaryotes and meiofauna). The aim of this study is to (1) assess the environmental parameters affecting benthic community composition in marshes, (2) highlight the associations between organisms from the three domains of life, and (3) determine the parameters controlling these associations.
View Article and Find Full Text PDFMar Pollut Bull
December 2024
College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
The present study evaluated the potential application of free-living marine nematode assemblages as indicators in assessing environmental condition of Jiaozhou Bay (JB), China. Shannon-Wiener diversity (H'), functional trait indices (Index of Trophic Diversity, ITD and Maturity Index, MI) were utilized to rank the benthic habitat quality of the sampled stations. Most of the nematode genera/species belonged to c-p (colonizer-persister) class 2, indicating dominance of opportunistic nematodes and suggesting organic enrichment in the bay.
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