Eri Ikeuchi
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View article: Seamount larval dispersal networks: A potential strategy for conserving ecological connectivity from deep‐sea mining
Seamount larval dispersal networks: A potential strategy for conserving ecological connectivity from deep‐sea mining Open
Seamounts are unique habitats in the deep sea facing anthropogenic stressors, including future deep‐sea mining. To conserve patchy marine habitats such as seamounts, it is critical to design conservation area networks that maintain connect…
View article: Hydrogen sulfide, hypoxia, and low salinity tolerance of deep-sea amphipods (Pseudorchomene sp.) collected from the sea floor off Joetsu, Sea of Japan
Hydrogen sulfide, hypoxia, and low salinity tolerance of deep-sea amphipods (Pseudorchomene sp.) collected from the sea floor off Joetsu, Sea of Japan Open
Experimental data contributing to the assessment of the environmental impact of deep-sea resource development is very scarce due to limited research opportunities and the difficulty of biological sampling. Experiments using deep-sea organi…
View article: Utilizing environmental DNA and imaging to study the deep-sea fish community of Takuyo-Daigo Seamount
Utilizing environmental DNA and imaging to study the deep-sea fish community of Takuyo-Daigo Seamount Open
The increase in interest of mining at seamounts means there is a critical need to establish baseline inventories through environmental survey, with the aim of promoting the conservation and stewardship of these remote habitats. To efficien…
View article: Seasonal variation of grazing scars on massive <i>Porites</i> corals in Sekisei Lagoon, Okinawa, Japan
Seasonal variation of grazing scars on massive <i>Porites</i> corals in Sekisei Lagoon, Okinawa, Japan Open
Coral reef ecosystems have high biodiversity and unique species interactions. One example is predation on corals by parrotfish species, known for their grazing on surfaces of massive Porites stony corals. However, factors causing variation…
View article: Preliminary study on the acute effects of hydrogen sulfide on Amphipoda (Lysianassoidea; Pseudorchomene sp. and Anonyx sp.) collected from deep-sea floors in the Sea of Japan
Preliminary study on the acute effects of hydrogen sulfide on Amphipoda (Lysianassoidea; Pseudorchomene sp. and Anonyx sp.) collected from deep-sea floors in the Sea of Japan Open
To study the environmental impact of the assessment technologies for the development of shallow methane hydrate zones in the Sea of Japan, deep-sea amphipods (Pseudorchomene sp. and Anonyx sp.) were collected from a depth of approximately …
View article: Oceanographic environments around Takarajima Island and Suwanosejima Island
Oceanographic environments around Takarajima Island and Suwanosejima Island Open
GB21-1航海(2021年2月28日~3月30日)において,トカラ列島周辺海域の計61地点でCTD観測と底層水サンプリングを実施した.調査海域は,黒潮が東シナ海からフィリピン海に流出する流路に位置しており,表層から底層にかけて,黒潮水,北太平洋亜熱帯モード水,北太平洋中層水,北太平洋深層水に区分される.横当島周辺の表層は低温・高塩分で特徴付けられ,これは地形的高まりによる鉛直混合の影響と考えられる.宝島東方沖では,海底付近に厚さ数十メートルの高濁度層が観測されており,海底…
View article: Microbial community structure of surface sediments in the deep-sea area around the Tokara Islands, Japan
Microbial community structure of surface sediments in the deep-sea area around the Tokara Islands, Japan Open
日本周辺の深海域における表層堆積物の微生物分布情報の蓄積のため，トカラ列島周辺海域で実施した海域地質調査（GB21-1）において，表層堆積物の微生物の群集解析を行った．採取した表層堆積物47試料のうち42試料からのDNA抽出に成功し，ハイスループットシーケンサーによる塩基配列の決定，R（R Core Team， 2021）による解析を行った．解析の結果，Proteobacteria門のGammaproteobacteriaa綱とAlphaproteobacteriaa綱，次…
View article: Non-bleached colonies of massive <i>Porites</i> may attract fishes for selective grazing during mass bleaching events
Non-bleached colonies of massive <i>Porites</i> may attract fishes for selective grazing during mass bleaching events Open
In this study we investigated the variation in grazing scar densities between bleached and non-bleached colonies of massive Porites species in Sekisei Lagoon (Okinawa, southwestern Japan) during a mass bleaching event in 2016. The grazing …