The influence and impact of tsunamis on the microorganism assembly of Nagatsura-Ura Lagoon, Miyagi, northeastern Japan
The influence and impact of tsunamis on the microorganism assembly of Nagatsura-Ura Lagoon, Miyagi, northeastern Japan
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DOI：
10.1007/s12562-020-01472-8
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发表时间：
2020-11
影响因子：
1.9
通讯作者：
Y. Okumura;H. Matsuoka;H. Arakawa;F. Tokanai;A. Suzuki;T. Irizuki;Hiroto Kajita;M. Hara
中科院分区：
文献类型：
--
作者：
Y. Okumura;H. Matsuoka;H. Arakawa;F. Tokanai;A. Suzuki;T. Irizuki;Hiroto Kajita;M. Hara
从长苏拉浦泻湖的两个地点收集了两个沉积物芯，该泻湖的河口在2011年东北冲海啸中被毁。虽然泻湖中部和内部的沉积物条件差异很大，但我们可以在这两个地方发现2011年东北冲海啸的痕迹，以及泻湖内部早期海啸的痕迹。在泻湖中部的62和72厘米之间的核心深度处观察到Chlorophyllamaxima。我们推断该层位与2011年东北冲海啸存款有关。在泻湖的内部，核心深度为116-142厘米的层位可以年龄为15世纪，因此被认为是1454年京都地震的结果。甲藻亚历山大藻（Alexandriumspp.）占来自下一代测序的浮游植物总读数的~ 22.6%。硅藻是浮游植物的第二大类群，与角毛藻属（Chaetocerosspp.）占总数的10.5%。甲藻和硅藻组成的垂直剖面变化不大。虽然海啸的痕迹，从泻湖的核心观察，并在附近的封闭海湾，我们认为，微生物的组成只有轻微的变化，由于通过封闭的泻湖口海水交换差的泻湖。
Two sediment cores were collected from two sites in Nagatsura-Ura Lagoon, the mouth of which was destroyed in the 2011 Tohoku-oki tsunami. Although sediment conditions differed widely between the central and inner parts of the lagoon, we could identify traces of the 2011 Tohoku-oki tsunami at both, and those of earlier tsunamis in the inner part of the lagoon. Chlorophyllamaxima were observed at core depths between 62 and 72 cm in the central part of the lagoon. We inferred that this horizon correlated with the 2011 Tohoku-oki tsunami deposit. In the inner part of the lagoon, the horizon at core depths of 116—142 cm could be aged to the 1400s, and is thus thought to have been formed as a consequence of the Kyotoku earthquake of 1454. The dinoflagellateAlexandriumspp. accounted for ~ 22.6% of the total read numbers of phytoplankton from next generation sequencing. Diatoms made up the second largest group of phytoplankton, withChaetocerosspp. representing ~ 10.5% of the total. The vertical profiles of dinoflagellate and diatom compositions showed little change. Although traces of tsunamis were observed in cores from the lagoon, and in nearby closed bays, we believe that the microbial composition has changed only slightly in the lagoon due to poor seawater exchange through the closed lagoon mouth.