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首页> 外文期刊>ICES Journal of Marine Science >DNA/RNA metabarcoding and morphological analysis of epipelagic copepod communities in the Izu Ridge off the southern coast of Japan
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DNA/RNA metabarcoding and morphological analysis of epipelagic copepod communities in the Izu Ridge off the southern coast of Japan

机译：日本南部海岸伊豆岭末端Copepod社区的DNA / RNA元态分析

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摘要

The Izu Ridge off the southern coast of Japan is composed of many seamounts and knolls and is an important fishery ground and hatchery for commercially important fish. As pelagic copepods link lower and higher trophic levels, we investigated the epipelagic copepods in the Izu Ridge using 28S DNA/RNA metabarcoding and microscopic approaches. In comparison with off-ridge regions, a low water temperature and high chlorophyll a concentration were observed in the Izu Ridge, possibly attributed to high levels of nutrients supplied by strong turbulences around the complex topography. We observed unique copepod communities with a large total biomass in the Izu Ridge, owing to the increased dominance of large copepod species. rRNA:rDNA (28S ratio) of these large species mainly showed positive correlations with the chlorophyll a concentration, suggesting a rapid response to the food supply. Migrating copepods were less dominant around the Izu Ridge with a shallow water depth. Higher species diversity and more rare species were detected in the Izu Ridge, which might be maintained by complex environment conditions including temporal and spatial variations in the concentration of chlorophyll a. Thus, the combined approach characterized copepod community structure and diversity supporting the rich pelagic ecosystems in the Izu Ridge.
机译：伊豆岭的日本南部海岸由许多海山和大吼组成，是商业上重要的鱼类的重要渔业地面和孵化场。作为Pelagic Copepods链接较低且较高的营养级别，我们使用28S DNA / RNA元建和微观方法研究了IZU脊中的eBipelagic Copepods。与离脊区域相比，在IZU脊观察到低水温和高叶绿素的浓度，可能归因于通过围绕复杂形貌的强烈湍流提供的高水平营养素。由于大型桡足类物种的优势增加，我们观察了IZU山脊的大量生物量的独特Copepod社区。 rRNA：这些大物种的rDNA（28s比）主要显示出与叶绿素的浓度正相关，表明对食品供应的快速反应。迁移桡足类较少的含有浅水深度的伊豆山脊。在IZU脊中检测到较高的物种多样性和更罕见的物种，其可能由复杂的环境条件维持，包括叶绿素A浓度的时间和空间变化。因此，组合方法表征了Copepod群落结构和多样性，支持IZU脊的丰富的骨质生态系统。

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