iriomote island
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2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Noriko Tada ◽  
Haruka Nishikawa ◽  
Hiroshi Ichihara ◽  
Hiromi Kayama Watanabe ◽  
Tatsu Kuwatani

AbstractOcean bottom electromagnetometers (OBEMs) installed on the seafloor around Nishinoshima Island (Bonin Islands) were missing after a December volcanic eruption. In February 2021, one was found on a beach on Iriomote Island (Ryukyu Islands), implying that it drifted westward for 1700 km. The reason(s) for the disappearance of the OBEMs and the path followed by the recovered OBEM while drifting are important information for future ocean bottom observations and seafloor volcanology in general. We conducted particle drifting simulations with and without horizonal eddy diffusion to estimate the possible drift path and duration of the recovered OBEM. Our simulations show that particles arriving at Iriomote Island have a 7–10% probability of having been transported from Nishinoshima; thus, such transport is not a rare occurrence. Transport durations in our simulations varied widely between 140 and 602 days depending on the drift paths. More detailed insight into the path and duration of drift of the OBEM will require further comparison between drifting simulations and growth histories of barnacles attached on the OBEM. A similar drift duration and path was reported for pumices that erupted from Fukutoku-Oka-no-Ba submarine volcano (southern Bonin Islands) during 18–21 January 1986 and arrived in the Ryukyu Islands in late May 1986. Such drifting simulations may prove useful for identifying the sources of drift pumices, and thus otherwise undetectable eruptions. Finally, the Fukutoku-Oka-no-Ba submarine volcano erupted on 13 August 2021, producing abundant pumice rafts that, based on our results, would likely arrive in the Ryukyu Islands. In fact, the beginning of October 2021, they began to arrive in the Ryukyu Islands. Graphical Abstract


Author(s):  
Yongjin Qiu ◽  
Noriko Kidera ◽  
May June Thu ◽  
Masaki Hayashi ◽  
Kanta Fujishima ◽  
...  

2021 ◽  
Author(s):  
Noriko Tada ◽  
Haruka Nishikawa ◽  
Hiroshi Ichihara ◽  
Hiromi Kayama Watanabe ◽  
Tatsu Kuwatani

Abstract Ocean bottom electromagnetometers (OBEMs) installed on the seafloor around Nishinoshima Island (Bonin Islands) were missing after a December volcanic eruption. In February 2021, one was found on a beach on Iriomote Island (Ryukyu Islands), implying that it drifted westward for 1,700 km. The reason(s) for the disappearance of the OBEMs and the path followed by the recovered OBEM while drifting are important information for future ocean bottom observations and seafloor volcanology in general. We conducted particle drifting simulations with and without horizonal eddy diffusion to estimate the possible drift path and duration of the recovered OBEM. Our simulations show that particles transported from Nishinoshima have a 7-10 % probability of arriving at Iriomote Island, which is thus not a rare occurrence. Transport durations in our simulations varied widely between 140 and 602 days depending on the drift paths. The most likely drift duration in our simulation was 150 – 180 days, with or without eddy diffusion, corresponding to the release from the seafloor of the OBEM between 22 August and 21 September 2020. These dates follow shortly after intensifying eruptions at Nishinoshima, which may have affected the seafloor around the island. A similar drift duration and path was reported for pumices that erupted from Fukutoku-Oka-no-Ba submarine volcano (northern Bonin Islands) during 18-21 January 1986 and arrived in the Ryukyu Islands in late May 1986. Such drifting simulations may prove useful for identifying the sources of drift pumices, and thus otherwise undetectable eruptions. Finally, the Fukutoku-Oka-no-Ba submarine volcano erupted on 13 August 2021, producing abundant pumice rafts that, based on our results, will likely arrive in the Ryukyu Islands in the coming months.


Zootaxa ◽  
2021 ◽  
Vol 5047 (3) ◽  
pp. 377-390
Author(s):  
SHOKI SHIRAKI ◽  
MICHITAKA SHIMOMURA ◽  
KEIICHI KAKUI

We describe Expanathura monile sp. nov. from Iriomote Island, Okinawa, Japan, northwestern Pacific. This species resembles E. collaris, E. macronesia, and E. haddae in having very broad uropodal rami, a broad telson, and a moderately shortened pleopod 1 endopod, but differs from these three species in the female having (1) the head with a dorsal V-shaped band of brown pigmentation, (2) the antennular flagellum with 3–4 articles, (3) antennal peduncular article 2 with an outer triangular projection, (4) the uropodal endopod longer than wide, (5) the uropodal exopod with an acute triangular projection, (6) an oval telson, and (7) the posterolateral setae on the telson similar in length. We present a revised key to known species in the genus Expanathura and briefly discuss the male polymorphism observed in E. monile.  


Behaviour ◽  
2021 ◽  
pp. 1-8
Author(s):  
Nigel K. Anderson ◽  
Henry D. Legett ◽  
Ikkyu Aihara ◽  
Ximena E. Bernal

Abstract We report a visual display, leg-stretching, in the nocturnal Ryukyu Kajika frog (Buergeria japonica) on Iriomote Island in southern Okinawa, Japan. This visual display is produced by males before, during, or after a vocalization and involves the extension of one or both hindlimbs outwards at substrate level. Leg-stretches in this species are performed during male-male agonistic interactions in choruses, and almost exclusively in concert with aggressive vocalizations. These observations are one of the first reports of visual displays for the Rhacophoridae family and provide insights into why visual displays evolve in frogs, especially in nocturnal species. We discuss our observations in the context of underlying mechanisms and selective pressures driving the evolution of anuran visual displays.


Zootaxa ◽  
2021 ◽  
Vol 4920 (2) ◽  
pp. 287-296
Author(s):  
TOMOYUKI KOMAI ◽  
TADAFUMI MAENOSONO ◽  
TOHRU NARUSE

A new alpheid shrimp species, provisionally assigned to the genus Salmoneus Holthuis, 1955, is described and illustrated on the basis of three specimens extracted from intertidal soft sediments on seagrass beds at Iriomote Island, southern Ryukyu Islands, Japan. Salmoneus singularis n. sp. is highly distinctive within the genus in having a pair of postorbital spines on the carapace, otherwise showing some affinities to the species of the S. gracilipes Miya, 1972 group. The possession of paired spines on the dorsolateral surface of the carapace is shared with several members of Triacanthoneus Anker, 2010, which is undoubtedly closely related to Salmoneus. However, the new species cannot be placed in Triacanthoneus because of the absence of a mid-dorsal spine on the carapace. 


2020 ◽  
Vol 9 (48) ◽  
Author(s):  
Masako Takashima ◽  
Ri-ichiroh Manabe ◽  
Moriya Ohkuma

ABSTRACT Here, we report draft genome sequence of oleaginous yeast strain Saitozyma sp. JCM 24511, which is phylogenetically closely related to Saitozyma podzolica. These data will have implications not only for the study of the oleaginous activities of yeasts but also for the study of the plant-microorganism microbiome.


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