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Journal articles on the topic 'Coral reefs and islands – Japan – Kikai Island'

Author: Grafiati

Published: 20 February 2023

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1

Ota, Yoko, and Akio Omura. "Recent Progress on Coral Reef Terrace Researches at Kikai Island, Southwestern Japan. Review of Coral Reef Terrace Studies at Kikai Island, Ryukyu Islands, Southwestern Japan." Quaternary Research (Daiyonki-Kenkyu) 39, no. 1 (2000): 45–53. http://dx.doi.org/10.4116/jaqua.39.45.

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2

Ota, Yoko, Keiichi Sasaki, Akio Omura, and Kayo Nozawa. "Recent Progress on Coral Reef Terrace Researches at Kikai Island, Southwestern Japan. Holocene Sea Level and Tectonic History Related to the Formation of Coral Terraces at Kikai Island, Northern Ryukyu Islands." Quaternary Research (Daiyonki-Kenkyu) 39, no. 1 (2000): 81–95. http://dx.doi.org/10.4116/jaqua.39.81.

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3

N., Abram, Webster J., Davies P., and Dullo W. "Biological response of coral reefs to sea surface temperature variation: evidence from the raised Holocene reefs of Kikai-jima (Ryukyu Islands, Japan)." Coral Reefs 20, no. 3 (November 1, 2001): 221–34. http://dx.doi.org/10.1007/s003380100163.

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4

Yamano, Hiroya, Osamu Abe, Hiroyuki Kitagawa, Etsuko Niu, and Toshio Nakamura. "Coral Reef Evolution at the Leeward Side of Ishigaki Island, Southwest Japan." Radiocarbon 43, no. 2B (2001): 899–908. http://dx.doi.org/10.1017/s0033822200041564.

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In comparison with windward coral reefs, the facies and evolution of leeward coral reefs has been discussed to a lesser extent. By accelerator mass spectrometry (AMS) carbon-14 dating of coral specimens collected from the trench excavated across a modern coral reef during a fishery port repair, we revealed the internal facies and Holocene evolution of a leeward reef in Ishigaki Island, Ryukyu Islands, southwest Japan. The reef facies can be split into three facies: the tabular Acropora framework facies, the tabular Acropora reworked facies, and the unconsolidated bioclast facies. The tabular Acropora reworked facies first formed a ridge by 3500 BR Then, the tabular Acropora framework facies grew both upward and seaward. The accumulation rates of the tabular Acropora framework facies ranged from 2.2 to 8.3 m/ka. Thus, the reef framework facies and accumulation rates of this leeward reef is similar to those of windward reefs, although the age of the reef top is younger than that of windward reefs.

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5

Omura, Akio, Keiichi Sasaki, Daisuke Terao, and Kazuo Murakami. "Recent Progress on Coral Reef Terrace Researches at Kikai Island, Southwestern Japan. A Chronological and Sedimentary Study on the Pleistocene Series in Kikai Island, Central Ryukyus, Southwestern Japan." Quaternary Research (Daiyonki-Kenkyu) 39, no. 1 (2000): 55–68. http://dx.doi.org/10.4116/jaqua.39.55.

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6

Kiyama, Osamu, Tsutomu Yamada, Toru Nakamori, and Yasufumi Iryu. "Recent Progress on Coral Reef Terrace Researches at Kikai Island, Southwestern Japan. Early Holocene Coral .DELTA.18O-based Sea Surface Temperature." Quaternary Research (Daiyonki-Kenkyu) 39, no. 1 (2000): 69–80. http://dx.doi.org/10.4116/jaqua.39.69.

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7

Maejima, Y., H. Matsuzaki, and T. Higashi. "Application of cosmogenic 10Be to dating soils on the raised coral reef terraces of Kikai Island, southwest Japan." Geoderma 126, no. 3-4 (June 2005): 389–99. http://dx.doi.org/10.1016/j.geoderma.2004.10.004.

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8

Cadoret, L., M. Adjeroud, and M. Tsuchiya. "Spatial distribution of chaetodontid fish in coral reefs of the Ryukyu Islands, southern Japan." Journal of the Marine Biological Association of the United Kingdom 79, no. 4 (August 1999): 725–35. http://dx.doi.org/10.1017/s0025315498000873.

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The spatial patterns of butterflyfish assemblages (Chaetodontidae) were examined within and between five islands of the Ryukyu Archipelago, southern Japan. Despite being the northernmost reef communities in the world and despite the severe natural and human-induced disturbances that have affected them since the 1970s, the coral reefs of the Ryukyu Islands have one of the most diversified assemblages of chaetodontids in the world. A total of 30 species were identified, and species richness per island ranged from 20 to 25 species. On each of the 45 stations prospected, between four and 17 species were recorded, and between 0.75 and 21.75 ind 250 m−2 were counted. Variation in species composition, species richness and abundance between islands was less pronounced than the variation within islands, where assemblages of the major reef environments (i.e. the reef flat, the reef edge, and the reef slope) were distinguished. The highest species richness and abundance were found on the reef slope and the reef edge. Canonical correspondence analysis revealed that depth, substrate complexity, and live coral cover influenced the distribution of chaetodontid fishes. These factors accounted for 20% of the variation in the species data matrix.

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9

Sasaki, Keiichi, Akio Omura, Kazuo Murakami, Natsume Sagawa, and Toru Nakamori. "Interstadial coral reef terraces and relative sea-level changes during marine oxygen isotope stages 3–4, Kikai Island, central Ryukyus, Japan." Quaternary International 120, no. 1 (January 2004): 51–64. http://dx.doi.org/10.1016/j.quaint.2004.01.006.

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10

FUJITA, YOSHIHISA, and MASAMI OBUCHI. "Comanthus kumi, a new shallow-water comatulid (Echinodermata: Crinoidea: Comatulida: Comasteridae) from the Ryukyu Islands, Japan." Zootaxa 3367, no. 1 (July 4, 2012): 261. http://dx.doi.org/10.11646/zootaxa.3367.1.24.

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A new species of the genus Comanthus A.H. Clark, 1908, is described on the basis of specimens collected from KumeIsland and Okinawa Island, the Ryukyu Islands, Japan. Comanthus kumi n. sp. is distinguished from all ten congeners byhaving extremely elongate arms exceeding 300 mm in length and the colouration in life. The new species concealed itswhole body in a crevice or small hole on coral reefs during the day and protruded only several elongate arms on the reef surface at night. This habit suggests that the new species is nocturnal.

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11

Inoue, Jun, Kanako Hisata, Nina Yasuda, and Noriyuki Satoh. "An Investigation into the Genetic History of Japanese Populations of Three Starfish, Acanthaster planci, Linckia laevigata, and Asterias amurensis, Based on Complete Mitochondrial DNA Sequences." G3: Genes|Genomes|Genetics 10, no. 7 (May 29, 2020): 2519–28. http://dx.doi.org/10.1534/g3.120.401155.

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Crown-of-thorns starfish, Acanthaster planci (COTS), are common in coral reefs of Indo-Pacific Ocean. Since they are highly fecund predators of corals, periodic outbreaks of COTS cause substantial loss of healthy coral reefs. Using complete mitochondrial DNA sequences, we here examined how COTS outbreaks in the Ryukyu Archipelago, Japan are reflected by the profile of their population genetics. Population genetics of the blue starfish, Linckia laevigata, which lives in the Ryukyu Archipelago, but not break out and the northern Pacific sea star, Asterias amurensis, which lives in colder seawater around the main Islands of Japan, were also examined as controls. Our results showed that As. amurensis has at least two local populations that diverged approximately 4.7 million years ago (MYA), and no genetic exchanges have occurred between the populations since then. Linckia laevigata shows two major populations in the Ryukyu Archipelago that likely diverged ∼6.8 MYA. The two populations, each comprised of individuals collected from coast of the Okinawa Island and those from the Ishigaki Island, suggest the presence of two cryptic species in the Ryukyu Archipelago. On the other hand, population genetics of COTS showed a profile quite different from those of Asterias and Linckia. At least five lineages of COTS have arisen since their divergence ∼0.7 MYA, and each of the lineages is present at the Okinawa Island, Miyako Island, and Ishigaki Island. These results suggest that COTS have experienced repeated genetic bottlenecks that may be associated with or caused by repeated outbreaks.

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12

Nagatsuka, Shizuo, and Yuji Maejima. "Dating of Soils on the Raised Coral Reef Terraces of Kikai Island in the Ryukyus, Southwest Japan: With Special Reference to the Age of Red-Yellow Soils." Quaternary Research (Daiyonki-Kenkyu) 40, no. 2 (2001): 137–47. http://dx.doi.org/10.4116/jaqua.40.137.

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13

Maejima, Yuji, Shizuo Nagatsuka, and Teruo Higashi. "Application of the Crystallinity Ratio of Free Iron Oxides for Dating Soils Developed on the Raised Coral Reef Terraces of Kikai and Minami-Daito Islands, Southwest Japan." Quaternary Research (Daiyonki-Kenkyu) 41, no. 6 (2002): 485–93. http://dx.doi.org/10.4116/jaqua.41.485.

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14

OSAWA, MASAYUKI, and TAIGI SATO. "A distinctive new species of the genus Polyonyx Stimpson, 1858 (Crustacea: Decapoda: Anomura: Porcellanidae) from Okinawa, southwestern Japan." Zootaxa 5091, no. 4 (January 17, 2022): 587–97. http://dx.doi.org/10.11646/zootaxa.5091.4.6.

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The new porcellanid crab Polyonyx deezi n. sp. is described on the basis of two specimens from Okinawa Island, Ryukyu Islands, southwestern Japan. The new species belongs to the P. sinensis group and may be closest to P. socialis Werding & Hiller, 2019 in the comparatively broad proportions of the carpi of the chelipeds and meri of the ambulatory legs. However, P. deezi n. sp. is immediately distinguished from all other congeners by the median branchial margins of the carapace being bluntly angular and produced laterally and the dorsal surfaces of the carapace and chelipeds with distinct protuberances. The occurrence of P. deezi n. sp. from coral reefs may be unusual in species of the P. sinensis group because many of the known species have been recorded from estuaries or coastal embayments. An identification key to the Indo-West Pacific species of the Polyonyx sinensis group is provided.

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15

Masucci, Giovanni Diego, and James D. Reimer. "Expanding walls and shrinking beaches: loss of natural coastline in Okinawa Island, Japan." PeerJ 7 (September 6, 2019): e7520. http://dx.doi.org/10.7717/peerj.7520.

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Okinawa is the largest and most populated island of the Ryukyu Archipelago in southern Japan and is renowned for its natural resources and beauty. Similar as to what has been happening in the rest of the country, Okinawa Island has been affected by an increasing amount of development and construction work. The trend has been particularly acute after reversion to Japanese sovereignty in 1972, following 27 years of post-war American administration. A coastline once characterized by extended sandy beaches surrounded by coral reefs now includes tracts delimited by seawalls, revetments, and other human-made hardening structures. Additionally, part of coastal Okinawa Island was obtained by land-filling shallow ocean areas (land reclamation). Nevertheless, the current extension of the artificial coastline, as well as the level of fragmentation of the natural coastline are unclear, due to the lack of both published studies and easily accessible and updated datasets. The aims of this research were to quantify the extension of coastline alterations in Okinawa Island, including the amount of land-filling performed over the last 41 years, and to describe the coastlines that have been altered the most as well as those that are still relatively pristine. The analyses were performed using a reference map of Okinawa Island based on GIS vector data extracted from the OpenStreetMap (OSM) coastline dataset (average node distance for Okinawa Island = 24 m), in addition to satellite and aerial photography from multiple providers. We measured 431.8 km of altered coastline, equal to about 63% of the total length of coastline in Okinawa Island. Habitat fragmentation is also an issue as the remaining natural coastline was broken into 239 distinct tracts (mean length = 1.05 km). Finally, 21.03 km2 of the island’s surface were of land reclaimed over the last 41 years. The west coast has been altered the most, while the east coast is in relatively more natural conditions, particularly the northern part, which has the largest amount of uninterrupted natural coastline. Given the importance of the ecosystem services that coastal and marine ecosystems provide to local populations of subtropical islands, including significant economic income from tourism, conservation of remaining natural coastlines should be given high priority.

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16

Puspitaningtyas, Indrie Hapsari, Siti Rudiyanti, and Bambang Sulardiono. "ASPEK REPRODUKSI BULU BABI (Sea Urchin) DI PERAIRAN PULAU MENJANGAN KECIL, KEPULAUAN KARIMUNJAWA, JEPARA (Aspects Reproduction of Sea Urchin in the Waters of Menjangan Kecil Island, Karimunjawa Islands, Jepara)." Management of Aquatic Resources Journal (MAQUARES) 6, no. 4 (July 25, 2018): 564–71. http://dx.doi.org/10.14710/marj.v6i4.21349.

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Gugusan terumbu karang yang terdapat di Kepulauan Karimunjawa termasuk ke dalam gugusan terumbu karang tepi dengan kisaran penutupan karang keras antara 6,7% - 68,9% dan indeks keragaman berkisar antara 0,43 - 0,91. Salah satu biota yang berasosiasi di ekosistem terumbu karang adalah bulu babi, yang merupakan biota filum echinodermata yang tersebar dari daerah intertidal dangkal hingga ke laut dalam. Gonad bulu babi di pasaran dikenal sebagai uni atau roe merupakan makanan populer dan salah satu komoditi utama di beberapa negara seperti Amerika Serikat, Kanada, Chili, Rusia, Prancis, Barbados dan Jepang. Penangkapan hingga overfishing menjadi masalah utama di berbagai negara, yang akan mengakibatkan penurunan jumlah populasi bulu babi di perairan. Penelitian ini dilakukan di Pulau Menjangan Kecil, Karimunjawa pada bulan Mei 2017. Tujuan dari penelitian ini adalah mengetahui aspek reproduksi bulu babi melalui nilai IKG, nilai TKG, dan Fekunditas Bulu Babi di Pulau Menjangan Kecil. Penelitian ini dilakukan dalam dua tahap yaitu, tahap sampling lapangan yang terdiri dari pengambilan sampel bulu babi, dengan metode acak menggunakan kuadran transek, dan pengukuran kualitas perairan. Tahap analisis laboratorium yang terdiri dari analisis Indeks Kematangan Gonad, Tingkat Kematangan Gonad, dan Fekunditas. Penelitian ini ada dua spesies yang ditemukan di lokasi sampling yaitu Diadema setosum dan Echinothrix calamaris. Hasil yang diperoleh untuk bulu babi jenis Diadema setosum nilai IKG berkisar antara 1,66% - 4,26% dan fekunditas berkisar antara 641 butir – 1.087 butir dan bulu babi jenis Echinothrix calamaris nilai IKG berkisar antara 5,32% - 7,54% dan fekunditas berkisar antara 1.159 butir – 2.192 butir, sedangkan nilai TKG kedua jenis bulu babi berada pada fase 5 (lima) yaitu tahap memijah. The coral reefs found in the Karimunjawa Islands are included in the cluster of coral reefs with hard coral cover ranges between 6.7% - 68.9% and the diversity index ranges from 0.43 to 0.91. One of the associated biota in the coral reef ecosystem is the sea urchin, which is an echinodermata physiological biota scattered from the shallow intertidal region to the deep sea. The sea urchin gonad on the market is known as uni or roe is a popular food and one of the main commodities in some countries such as USA, Canada, Chile, Russia, France, Barbados and Japan. Overfishing is a major problem in many countries, which will lead to a decrease in the number of sea urchin populations. This research was conducted in Menjangan Kecil Island, Karimunjawa in May 2017. The purpose of this research is to know the reproductive aspect of the sea urchin through IKG value, TKG value, and Fecundity of sea urchin on Menjangan Kecil Island. This research was conducted in two stages, field sampling stage consisting of sampling of sea urchins, by random method using transect quadrant, and measurement of water quality. Phase of laboratory analysis consisting of Gonad Maturity Index analysis, Gonad Maturity Level, and Fecundity. The study used only two species found at the sampling site is Diadema setosum and Echinothrix calamaris. The results obtained for Diadema setosum type IKG ranged from 1.66% - 4.26% and fecundity ranged from 641 grains - 1.087 grains and Echinothrix calamaris type IKG in the range of 5.32% - 7.54% and fecundity ranges from 1,159 grains - 2,192 grains, while the TKG value of both types of sea urchins is in phase 5 (five) or spawning phase.

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17

Fujita, Ryosuke, Kazuhisa Goto, Yasufumi Iryu, and Tomoya Abe. "Millennial paleotsunami history at Minna Island, southern Ryukyu Islands, Japan." Progress in Earth and Planetary Science 7, no. 1 (September 23, 2020). http://dx.doi.org/10.1186/s40645-020-00365-9.

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Abstract Huge tsunami waves have repeatedly bombarded the southern end of the Ryukyu Islands (Miyako and Yaeyama Islands, southwestern Japan) at several-hundred-year intervals. Therefore, clarifying the islands’ paleotsunami history is important for risk assessment. Nevertheless, discrepancies of paleotsunami histories exist among regional studies of tsunami boulders and sandy tsunami deposits. Radiocarbon ages of tsunami boulders indicate that tsunami events of the last 2400 years have occurred every 150–400 years, most recently the historical 1771 Meiwa tsunami. Sandy tsunami deposits at Yaeyama Islands show that four tsunami events of the last 2000 years struck the islands at approximately 600-year intervals. Sandy tsunami deposits of the Miyako Islands have been studied only rarely. Therefore, studying sandy tsunami deposits in the Miyako Islands is crucially important for clarifying the paleotsunami history of this region. We conducted a trench survey on Minna Island, located among the westernmost Miyako Islands, which revealed two sandy tsunami deposits under a coral tsunami boulder transported by the 1771 tsunami. The upper tsunami deposit was likely deposited by the 1771 tsunami, as inferred from stratigraphic correlation to the tsunami boulder. However, the lower tsunami deposit was probably deposited 700–1000 years ago, which is consistent with the age range of the paleotsunami reported for Yaeyama Islands. Because sandy tsunami deposits found in this and earlier studies are thick and deposited at high elevation and far inland, these are useful markers of large tsunami events similar to the 1771 event. However, the reported tsunami boulders of various sizes are deposited along the coast and reefs: they can be formed not only by large tsunami events but also by small ones. It is noteworthy that each tsunami deposit is coarse and thick (40–48 cm) relative to the island elevation (about 12 m maximum, 7 m above the mean sea level at the study site). By assuming that tsunamis have affected this region repeatedly during the past few thousand years at around 600-year intervals, tsunamis might have been important geomorphic agents for building up small reef-surrounded islands such as Minna Island.

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