Ogasawara Islands Management Plan

Total Page:16

File Type:pdf, Size:1020Kb

Ogasawara Islands Management Plan OOggaassaawwaarraa IIssllaannddss MMaannaaggeemmeenntt PPllaann (English translation for World Heritage nomination) January 2010 Ministry of the Environment Forestry Agency Agency for Cultural Affairs Tokyo Metropolitan Government Ogasawara Village Japan Contents 1. Introduction -------------------------------------------------------------------------------------- 1 2. Basic Information of the Plan------------------------------------------------------------------ 1 1) Objectives of the Management Plan ------------------------------------------------- 1 2) Scope of the Management Plan ------------------------------------------------------ 1 3) Goal and Target Period of the Management Plan---------------------------------- 1 4) Relation with the Action Plan and Other Plans ------------------------------------ 1 3. Overview of the Ogasawara Islands ---------------------------------------------------------- 3 1) Location of the Ogasawara Islands -------------------------------------------------- 3 2) General Information ------------------------------------------------------------------- 3 3) Natural Environment ------------------------------------------------------------------ 3 4) Social Environment -------------------------------------------------------------------- 5 4. Management Goals and Basic Principles ---------------------------------------------------- 7 1) Management Goals -------------------------------------------------------------------- 7 2) Basic Principles ------------------------------------------------------------------------ 7 (1) Conservation of the Outstanding Natural Environment-------------------- 7 (2) Removal and Avoidance of Impacts of Alien Species --------------------- 7 (3) Harmony between Daily Life of Humans and Nature---------------------- 7 (4) Adaptive Conservation and Management------------------------------------ 8 5. Management Measures ------------------------------------------------------------------------- 9 1) Proper Enforcement of Protective Instruments------------------------------------- 9 2) Strategic Conservation of Ecosystems by Island--------------------------------- 12 3) Prevention of Introduction and Dispersion of New Alien Species ------------ 21 4) Environmental Considerations in Individual Projects and Research ---------- 26 5) Promotion of Lifestyle in Harmony with Nature -------------------------------- 27 6) Promotion of Wise Use and Ecotourism ------------------------------------------ 28 7) Monitoring and Information -------------------------------------------------------- 30 6. Management System-------------------------------------------------------------------------- 32 1) Coordination among Stakeholders------------------------------------------------- 32 2) Adaptive Management System based on Scientific Findings ------------------ 32 3) Management Authorities ------------------------------------------------------------ 32 4) Management of Implementation of the Plan-------------------------------------- 33 7. Conclusion ------------------------------------------------------------------------------------- 34 Islands, the management authorities aim to achieve 1. Introduction close mutual communication and cooperation with other administrative agencies, the residents of the The Ogasawara Islands, located in the northwestern Ogasawara Islands, business stakeholders engaged in Pacific Ocean to the south of the Japanese tourism, agriculture, and fishery, researchers, Archipelago, consist of sporadically distributed nonprofit organizations (NPOs), visitors including islands extending approximately 400 km from north tourists, and other stakeholders (hereafter referred to to south. Each component island is an oceanic collectively as “stakeholders”). island that, since time of origin, has never been connected by land to the continent. The Ogasawara 2) Scope of the Management Plan Islands were uninhabited until 1830 and were The nominated property is composed of all the therefore called the “Bonin Islands” (“bonin” derives islands of the Ogasawara Archipelago excluding from the Japanese word meaning no inhabitation). Chichijima and Hahajima, most parts of Chichijima The ecosystems of these oceanic islands have been and Hahajima, as well as the whole islands of preserved very well. Nishinoshima, Kita-iwoto, and Minami-iwoto. The Ogasawara Islands were formed by island arc For the purpose of conservation and management volcanic activities approximately 48 to 44 million of the natural environment of the nominated property, years ago. In no other place in the world is it is actions such as the removal of the impacts of alien possible to observe on-land records of the initial species need to be taken. Because most of these stages of island arc formation at the subduction zone actions must be implemented integrally without of oceanic tectonic plates. In addition, the distinction between the nominated property and its organisms of the Ogasawara Islands have diverse surroundings, this Management Plan covers the entire origins. Not only have many endemic species been Ogasawara Islands including the nominated property, produced through unique evolutionary processes, but surrounding land, and marine areas, in addition to many of these species still survive today, providing ship navigation routes. the opportunity for us to observe their ongoing The geographical area covered by this evolutionary processes. Management Plan is shown in the figure below, In recognition of the value of the natural together with the area that is nominated for environment of the Ogasawara Islands, which feature inscription on the World Heritage List. globally rare ecosystems and geologic characteristics, and to pass this environment on to future generations as the common property of all humanity, the 3) Goal and Target Period of the Ogasawara Islands Management Plan (hereafter Management Plan referred to as the “Management Plan”) has been This Management Plan contains management prepared and is presented herein. measures necessary to achieve the overall management goal. It sets out activities to be implemented over the next 5 to 10 years to achieve 2. Basic Information of the Plan long-term goals. The plan will be reviewed and 2. Basic Information of the Plan revised as necessary, in response to changes in the natural environment and social circumstances. 1) Objectives of the Management Plan The objectives of the Management Plan are to 4) Relation with the Action Plan and clarify basic policies concerning the enforcement of Other Plans various conservation and management instruments Other Plans and to promote appropriate and smooth conservation The Action Plan is a detailed plan under the and management of the natural environment of all the Management Plan that complements the Management Ogasawara Islands (for the purpose of this Plan. The Action plan demonstrates the priority Management Plan, the phrase “Ogasawara Islands” sequence and process of short-term targets and refers to the Ogasawara Archipelago, the Kazan activities. Island Group (known as Volcano Islands), Individual plans based on different laws created by Nishinoshima Island, and the surrounding marine each management authority and individual project area), including the area constituting the natural implementation plans shall take into account the property nominated for inscription on the World Management Plan and Action Plan. Consolidated Heritage List (hereafter referred to as the “nominated planning framework shall therefore be established. property”). The Ministry of the Environment, the Forestry Agency, the Agency for Cultural Affairs, the Tokyo Metropolitan Government, and Ogasawara Village (hereafter referred to as the “management authorities”) are responsible for the various instruments for conservation and management of the natural environment. For the conservation and management of the 1 Fig. 1-1 World Heritage Management Area Nominated property World Heritage Management Area Hahajima Island Group Chichijima Island Group Ototojima Island Anijima Island Nishijima Island Hahajima Island Higashijima Mukohjima Island Island Hirajima Island Meijima Island Chichijima Imotojima Island Island Anejima Island Minamijima Island Kita-iwoto Island Mukojima Island Group Mukojima Island Group Yomejima Island Kitanoshima Island Mukojima Island Minami-iwoto Island Nishinoshima Island Nakodojima Island 2 islands are securely conserved. 3. Overview of the Ogasawara Islands 3) Natural Environment i) Geology 1) Location of the Ogasawara Islands The Ogasawara Islands make up an oceanic island The Ogasawara Islands lie in the northwestern arc that was formed on an oceanic crust (Fig. 2-1). Pacific to the south of the Japanese Archipelago, with The Izu-Ogasawara (Bonin) Arc, on which the Chichijima Island, located approximately 1,000 km Ogasawara Archipelago and the Kazan Island Group from Tokyo, and other islands sporadically rest, is an island arc-trench system extending 1,500 distributed over 400 km from north to south. The km in length that was formed along the eastern edge islands are divided into the Ogasawara Archipelago of the oceanic Philippine Sea plate as a result of the (consisting of the Chichijima Island Group, the subduction of the Pacific plate 48 Ma (Ma: Hahajima Island Group, and the Mukojima Island megaannum, or million years ago). The Group), and the Kazan Island Group and surrounding Izu-Ogasawara Arc is one of the most studied in isolated islands such as Nishinoshima. Chichijima, terms of geophysics, geology, and petrology because the
Recommended publications
  • Seabirds in the Stomach Contents of Black Rats Rattus Rattus on Higashijima, the Ogasawara (Bonin) Islands, Japan
    Yabe et al.: Seabirds in stomachs of Black Rats 293 SEABIRDS IN THE STOMACH CONTENTS OF BLACK RATS RATTUS RATTUS ON HIGASHIJIMA, THE OGASAWARA (BONIN) ISLANDS, JAPAN TATSUO YABE1,2, TAKUMA HASHIMOTO3, MASAAKI TAKIGUCHI3, MASANARI AOKI3 & KAZUTO KAWAKAMI4 1Rat Control Consulting, 1380–6 Fukuda, Yamato, Kanagawa, 242-0024, Japan ([email protected]) 2Tropical Rat Control Committee, c/o Overseas Agricultural Development Association, 8-10-32 Akasaka, Minato-Ku, Tokyo, 107-0052, Japan 3Japan Wildlife Research Center, 3-10-10 Shitaya, Taito-Ku, Tokyo, 110-8676, Japan 4Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki, 305-8687, Japan Received 11 September 2008, accepted 7 July 2009 Eradication programs for invasive rodents have accelerated since On Higashijima, Ogasawara Islands, rats are threatening the island pioneering efforts by New Zealand biologists in the 1970s to species. Seabirds such as Bulwer’s Petrels Bulweria bulwerii conserve not only seabird populations but also island ecosystems and Tristram’s Storm-Petrels are threatened by Black Rats. Ten (Howald et al. 2007, Rauzon 2007). In Japan, Black Rat Rattus carcasses of Bulwer’s Petrels were found for the first time on the rattus eradication programs have been carried out recently in the island in July 2005 (K. Horikoshi pers. comm.). Pictures taken Ogasawara (Bonin) Islands (Hashimoto 2009, Makino 2009). The during the period between June and October 2006 with automatic Ogasawara Islands are known to be a sanctuary for birds, including cameras (and the amount of rat tooth marks on bones) suggested several indigenous or endangered species such as Columba janthina that Black Rats preyed on more than 1000 Bulwer’s Petrels and their nitens, Apalopteron familiare, Tristram’s Storm-Petrel Oceanodroma eggs, and that they also ate Tristram’s Storm-Petrels (Horikoshi et tristrami, Matsudaira’s Storm-Petrel O.
    [Show full text]
  • Ogasawara) Archipelago, Japan, and Its Identification Using Molecular Sequences from a Herbarium Specimen Collected More Than 100 Years Ago
    ISSN 1346-7565 Acta Phytotax. Geobot. 70 (3): 149–158 (2019) doi: 10.18942/apg.201901 Rediscovery of Liparis hostifolia (Orchidaceae) on Minami-iwo-to Island in the Bonin (Ogasawara) Archipelago, Japan, and its Identification Using Molecular Sequences from a Herbarium Specimen Collected more than 100 Years Ago 1,† 2,† 3 4 Koji TaKayama , Chie TsuTsumi , Dairo KawaguChi , hiDeToshi KaTo anD 2,* Tomohisa yuKawa 1Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan; 2 Department of Botany, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba 305- 0005, Japan. *[email protected] (author for correspondence); 3 Ogasawara Islands Branch Office, Tokyo Metropolitan Government, Nishimachi, Chichi-jima, Ogasawara-mura, Tokyo 100-2101, Japan; 4 Department of Biological Sciences, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan. † These authors contributed equally to this work Liparis hostifolia (Orchidaceae) on Minami-iwo-to Island in the Bonin (Ogasawara) Archipelago was rediscovered for the first time in 79 years during a field survey in 2017. Its identity was confirmed by morphological comparison and DNA extractions from herbarium specimens collected between 1914 and 1938. Results from the molecular phylogenetic analyses demonstrated that L. hostifolia belongs to the L. makinoana complex. In comparison with other members of the L. makinoana complex, the broadly ovate labellum, short dormancy period, and flowering from November to March are unique characteristics of L. hostifolia. Results from the molecular phylogenetic analyses also suggested that L. hostifolia has had a long-isolated history in the Bonin Archipelago and probably migrated from temperate East Asia.
    [Show full text]
  • Identification of Infrasonic and Seismic Components of Tremors in Single
    Kurokawa and Ichihara Earth, Planets and Space (2020) 72:171 https://doi.org/10.1186/s40623-020-01302-2 FULL PAPER Open Access Identifcation of infrasonic and seismic components of tremors in single-station records: application to the 2013 and 2018 events at Ioto Island, Japan Aika K. Kurokawa1* and Mie Ichihara2 Abstract Infrasonic stations are sparse at many volcanoes, especially those on remote islands and those with less frequent eruptions. When only a single infrasound station is available, the seismic–infrasonic cross-correlation method has been used to extract infrasound from wind noise. However, it does not work with intense seismicity and sometimes mistakes ground-to-atmosphere signals as infrasound. This paper proposes a complementary method to identify the seismic component and the infrasonic component using a single microphone and a seismometer. We applied the method to estimate the surface activity on Ioto Island. We focused on volcanic tremors during the phreatic eruption on April 11, 2013, and during an unconfrmed event on September 12, 2018. We used the spectral amplitude ratios of the vertical ground motion to the pressure oscillation and compared those for the tremors with those for known signals generated by volcano-tectonic earthquakes and airplanes fying over the station. We were able to identify the infrasound component in the part of the seismic tremor with the 2013 eruption. On the other hand, the tremor with the unconfrmed 2018 event was accompanied by no apparent infrasound. We interpreted the results that the infrasound with the 2013 event was excited by the vent opening or the ejection of ballistic rocks, and the 2018 event was not an explosive eruption either on the ground or in the shallow water.
    [Show full text]
  • Forest Structures, Composition, and Distribution on a Pacific Island, with Reference to Ecological Release and Speciation!
    Pacific Science (1991), vol. 45, no. 1: 28-49 © 1991 by University of Hawaii Press. All rights reserved Forest Structures, Composition, and Distribution on a Pacific Island, with Reference to Ecological Release and Speciation! YOSHIKAZU SHIMIZU2 AND HIDEO TABATA 3 ABSTRACT: Native forest and scrub of Chichijima, the largest island in the Bonins, were classified into five types based on structural features: Elaeocarpus­ Ardisia mesic forest, 13-16 m high, dominated by Elaeocarpus photiniaefolius and Ardisia sieboldii; Pinus-Schima mesic forest, 12-16 m high, consisting of Schima mertensiana and an introduced pine , Pinus lutchuensis; Rhaphiolepis­ Livistonia dry forest, 2-6 m high, mainly occupied by Rhaphiolepis indica v. integerrima; Distylium-Schima dry forest, 3-8 m high, dominated by Distylium lepidotum and Schima mertensiana; and Distylium-Pouteria dry scrub, 0.3­ 1.5 m high, mainly composed of Distylium lepidotum. A vegetation map based on this classification was developed. Species composition and structural features of each type were analyzed in terms of habitat condition and mechanisms of regeneration. A group of species such as Pouteria obovata, Syzgygium buxifo­ lium, Hibiscus glaber, Rhaphiolepis indica v. integerrima, and Pandanus boninen­ sis, all with different growth forms from large trees to stunted shrubs, was subdominant in all vegetation types. Schima mertensiana , an endemic pioneer tree, occurred in both secondary forests and climax forests as a dominant canopy species and may be an indication of "ecological release," a characteristic of oceanic islands with poor floras and little competitive pressure. Some taxonomic groups (Callicarpa, Symplocos, Pittosporum, etc.) have speciated in the under­ story of Distylium-Schima dry forest and Distylium-Pouteria dry scrub.
    [Show full text]
  • Endemic Land Snail Fauna (Mollusca) on a Remote Peninsula in the Ogasawara Archipelago, Northwestern Pacific1
    Endemic Land Snail Fauna (Mollusca) on a Remote Peninsula in the Ogasawara Archipelago, Northwestern Pacific1 Satoshi Chiba2,3, Angus Davison,4 and Hideaki Mori3 Abstract: Historically, the Ogasawara Archipelago harbored more than 90 na- tive land snail species, 90% of which were endemic. Unfortunately, about 40% of the species have already gone extinct across the entire archipelago. On Haha- jima, the second-largest island and the one on which the greatest number of species was recorded, more than 50% of species are thought to have been lost. We report here the results of a recent survey of the snails of a remote peninsula, Higashizaki, on the eastern coast of Hahajima. Although the peninsula is small (@0.3 km2) and only part is covered by forest (<0.1 km2), we found 12 land snail species, all of which are endemic to Ogasawara. Among these species, five had been thought to already be extinct on Hahajima, including Ogasawarana yoshi- warana and Hirasea acutissima. Of the former, there has been no record since its original description in 1902. Except for the much larger island of Anijima and the main part of Hahajima, no single region on the Ogasawara Archipelago maintains as great a number of native land snail species. It is probable that the land snail fauna of the Higashizaki Peninsula is exceptionally well preserved be- cause of a lack of anthropogenic disturbance and introduced species. In some circumstances, even an extremely small area can be an important and effective refuge for threatened land snail faunas. The native land snail fauna of the Pacific one such example: of 95 recorded species, islands is one of the most seriously endan- more than 90% are endemic (Kuroda 1930, gered faunas in the world (e.g., Murray et al.
    [Show full text]
  • Abundance of the Ogasawara Buzzard on Chichijima, the Pacific Ocean
    SEPTEMBER 2000 SHORT COMMUNICATIONS 241 DE LA PLEA,M.R. 1985. Guia de AvesArgentinas, Falcon- NAROSKY, T. AND A.G. DI GIACOMO. 1993. Las Aves de la iformes. Edici6n del antor, Santa F6, Argentina. Provinciade BuenosAires: distribuci6n y estatus.Aso- DEEHoYo, J., A. ELLIOTT,ANDJ. SARGATAL.lEDS.]. 1994. ciaci6n Ornitol6gica del Plata, Vazquez Mazzini Ed y Handbook of the birds of the world. Vol. 2. New L.O.L.A., Buenos Aires, Argentina. World vultures to guineafowl. Lynx Edicions, Barce- --AND D. YZURIETA. 1973. Nidificaci6n de dos circi- lona, Spain. dos en la zona de San Vicente (Pcia. de Buenos A•- FIORA,A. 1933. E1peso de las aves.Hornero 5:174-188. res). Hornero 11:172-176. GONZ3•LEZLOPEZ, J.L. 1991. E1 Aguilucho Lagunero Cir- --AND --. 1987. Gu/a para la identificaci6nde cusaeruginosus (L., 1748) en Espafia.Situaci6n, Biol- las Aves de Argentina y UruguayßAsoc. Ornitol6g•ca ogia de la Reproducci6n, Alimentaci6n y Conserva- del Plata, Buenos Aires, Argentina. ci6n. ICONA-•C.S.I.C, Madrid, Espafia. SAGGESE,M.D. AND E.R. DE LUCCA.1995. Reproducci6n GROSSMAN,M.L. ANDJ. HAMLET.1964. Birds of prey of del Gavilan Ceniciento Circuscinereus en la patagoma the world. Bonanza Books, New York, NY U.S.A. argentina. Hornero14: 21-26. HUMPHREY, P.S., D. BRIDGE, P.W. REYNOLDS,AND R.T. PE- S^LVADOR,S.A. 1988. Datos de peso de avesArgentinas. TERSON.1970. Birds of Isla Grande (Tierra del Fue- Hornero 13:78-83. go). Preliminary Smithsonian Manual. Smithsonian ß 1990. Datos de pesosde avesArgentinas 2. Hor- Inst., Washington,DC U.S.A.
    [Show full text]
  • Differences in Vocalizations of Japanese Bush Warblers on Chichijima and Hahajima in the Ogasawara Islands
    Bull. Natl. Mus. Nat. Sci., Ser. A, 44(4), pp. 125–132, November 22, 2018 Differences in Vocalizations of Japanese Bush Warblers on Chichijima and Hahajima in the Ogasawara Islands Shoji Hamao Department of Zoology, National Museum of Nature and Science, 4–1–1 Amakubo, Tsukuba, Ibaraki, 305–0005 Japan E-mail: [email protected] (Received 4 August 2018; accepted 26 September 2018) Abstract Bird songs play an important role in species recognition in reproductive behaviors. Therefore, geographic variation in the songs of a given species affects gene flow and reproductive isolation. A previous study showed that Japanese bush warblers, Cettia diphone, on Hahajima in the Ogasawara (Bonin) Islands sing songs with a simpler acoustic structure than those of C. diphone in mainland Japan. I investigated whether the acoustic structure of songs differs between the populations on two neighboring islands, Chichijima and Hahajima. In type-H songs, the maxi- mum frequency was lower, the minimum frequency was higher, and the frequency range was, therefore, narrower on Hahajima than on Chichijima. In type-L songs, the maximum and minimum frequencies were lower and the frequency range was narrower on Hahajima than on Chichijima. A possible factor giving rise to the narrower frequency range on Hahajima is the sound transmission properties of the habitat, although further studies are needed to explore this hypothesis. Loose iso- lation among populations could produce differences in song structure because birdsong is a cultur- ally transmitted trait. Key words: acoustic structure, Cettia diphone, geographic variation, Japanese bush warbler, Ogasawara Islands, song Parus major, within a habitat, suggesting that Introduction blue tits use species-specific songs (i.e., songs Like morphological traits, bird songs have with a trill) to reduce aggressive interactions evolved under various selection pressures from with great tits, whose songs never include trills ecological and social factors (Kroodsma and (Doutrelant and Lambrechts, 2001).
    [Show full text]
  • The Battle of Iwo Jima: a Family Waits for News, 1945
    The Battle of Iwo Jima: A family waits for news, 1945 Introduction As part of the effort to secure land close enough to Japan to launch attacks against the mainland, the US Army and Navy began bombing the Bonin Islands of Iwo Jima, Hajajima and Chichijima, in June 1944. Army and Navy bombers hit Iwo Jima for over eight months, culminating in seventy-four straight days of continuous airstrikes. Thirty-three of Lieutenant Bob Stone’s forty bombing missions were flown in the Iwo Jima campaign. The amphibious assault on the island began on February 19 and continued for 36 days. The United States suffered casualties of more than 6,800 dead and 20,000 wounded. Of the 20,000 Japanese soldiers defending Iwo Jima, only 1,083 survived. For the Stone family, Iwo Jima must have been particularly nerve-wracking. Four of the five Stone sons were involved in the invasion, including Bob and his stepbrother Barry Marks. Barry, a Marine, was stationed on Guam at a base near Bob’s. The brothers were able to visit each other frequently and share family news. Almost a month after the invasion of Iwo Jima began, Bob informed his parents that Barry was a part of the invasion. Excerpt from Robert L. Stone to Jacob Stone and Beatrice Stone, March 4, 1945. GLC09620.164 Until now I was unable to discuss the whereabouts of Barry’s outfit because it hadn’t come out in the newscasts or the papers. When I returned from rest leave, [on February 9th], he left me a note saying “when you next bomb Iwo be careful you don’t hit me” so of course I knew the 3rd marines were Iwo bound.
    [Show full text]
  • Petrology and Geochemistry of Boninite Series Volcanic Rocks, Chichi-Jima, Bonin Islands, Japan
    PETROLOGY AND GEOCHEMISTRY OF BONINITE SERIES VOLCANIC ROCKS, CHICHI-JIMA, BONIN ISLANDS, JAPAN P.F. Dobson Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 S. Maruyama Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan J.G. Blank Center for the Study of Life in the Universe, SETI Institute, 515 N. Whisman Road, Mountain View, California 94043 J.G. Liou Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305 Abstract An Eocene submarine boninite series volcanic center is exposed on the island of Chichi-jima, Bonin Islands, Japan. Five rock types, boninite, bronzite andesite, dacite, quartz dacite, and rhyolite, were distinguished within the boninite volcanic sequence on the basis of petrographic and geochemical observations. Boninite lavas contain high magnesium, nickel, and chromium contents indicative of primitive melts, but have high silica contents relative to other mantle- derived magmas. All boninite series lavas contain very low incompatible element concentrations, and concentrations of high-field strength elements in primitive boninite lavas are less than half of those found in depleted mid-ocean ridge basalts. Abundances of large-ion lithophile elements are relatively high in boninite series lavas, similar to the enrichments observed in many island arc lavas. Trends for both major and trace element data suggest that the more evolved lavas of the boninite magma series were derived primarily through high-level fractional crystallization of boninite. Textural features, such as resorption and glomeroporphyrocrysts, and reverse chemical zonations suggest that magma mixing contributed to the development of the quartz dacite lavas. Introduction A well exposed sequence of Eocene boninite series volcanic rocks are found on Chichi-jima (Figure 1), the type locality for boninites (Peterson, 1891).
    [Show full text]
  • 24. Paleomagnetic Evidence for Northward Drift and Clockwise Rotation of the Izu-Bonin Forearc Since the Early Oligocene1
    Taylor, B., Fujioka, K., et al., 1992 Proceedings of the Ocean Drilling Program, Scientific Results, Vol. 126 24. PALEOMAGNETIC EVIDENCE FOR NORTHWARD DRIFT AND CLOCKWISE ROTATION OF THE IZU-BONIN FOREARC SINCE THE EARLY OLIGOCENE1 Masato Koyama,2 Stanley M. Cisowski,3 and Philippe Pezard4 ABSTRACT A paleomagnetic study was made on the deep-marine sediments and volcanic rocks drilled by Ocean Drilling Program Leg 126 in the Izu-Bonin forearc region (Sites 787, 792, and 793). This study evaluates the sense and amount of the tectonic drift and rotation associated with the evolution of the Philippine Sea Plate and the Izu-Bonin Arc. Alternating-field and thermal demagnetization experiments show that most of the samples have stable remanence and are suitable for paleomagnetic studies. Paleomagnetic declinations were recovered by two methods of core orientation, one of which uses a secondary viscous magnetization vector of each specimen as an orientation standard, and the other of which is based on the data of downhole microresistivity measurement obtained by using a formation microscanner. Oligocene to early Miocene samples show 10° to 14° shallower paleolatitudes than those of the present. Middle Miocene to early Oligocene samples show progressive clockwise deflections (up to ~80°) in declination with time. These results suggest large northward drift and clockwise rotation of the Izu-Bonin forearc region since early Oligocene time. Considering previous paleomagnetic results from the other regions in the Philippine Sea, this motion may reflect large clockwise rotation of the whole Philippine Sea Plate over the past 40 m.y. INTRODUCTION several tectonic models have been proposed, a common consensus has not yet been achieved.
    [Show full text]
  • Chapter 2. Deploying Land, Infrastructure, Transport And
    Section 2 Measures, etc. against Aging Social Infrastructures Deploying Land, Infrastructure, Transport and Chapter 2 Tourism Administration Tailored to Urges of the Times II Chapter 2 Section 1 Driving the Implementation of a National Land Policy Package The implementation of a comprehensive national land policy package has been driven on the basis of a full package of Deploying Land, Infrastructure, Transport and Tourism Administration Tailored to Urges of the Times to Urges Administration Tailored and Tourism Transport Deploying Land, Infrastructure, measures designed to guide the work of national spatial land planning; namely, National Spatial Strategies (national plan) (2008 Cabinet decision), which envisions “the construction of a national land where diverse regional blocks develop autonomously and the creation of a beautiful national land where life is comfortable” as a new vision of national land, Global Regional Plans (2009 Minister decision), which summarize the regional strategies of the individual global blocks and the specific approaches they take to implement the strategies and the Fourth National Land Use Plan (national plan) (2008 Cabinet decision), which is committed to a key principle of sustainable land management. The implementation of these plans is being monitored from year to year to get them consolidated among the stakeholders concerned with National Spatial Strategies. About seven years since the formulation of National Spatial Strategies (national plan), Japan is confronted with drastic changes, such as intensifying competition between nations and cities in pace with progressive globalization and imminent possible threats from huge natural disasters, such as the Nankai Trough Mega Earthquake and Tokyo Inland Earthquake, as well as a rapidly shrinking population in an aging society with falling birthrates, with the population predicted to halve in about 60% of all the regions in 2050 and elderly people accounting for about 40% of the total population.
    [Show full text]
  • From Japan I
    J. Gen. Appl. Microbiol., 18, 433-454 (1972) COPROPHILOUS PYRENOMYCETES FROM JAPAN I KOUHEI FURUYA AND SHUN-ICHI UDAGAWA* Fermentation Research Laboratories, Sankyo Co., Ltd., Hiro-machi 1-chome, Shinagawa-ku, Tokyo 140 and *Department of Microbiology , National Institute of Hygienic Sciences, Kamiyoga 1-chome, Setagaya-ku, Tokyo 158 (Received July 13, 1972) For the purpose of these series of mycological survey, 220 dung samples of wild and domestic animals for determination of species of pyrenomycetous Ascomycetes were collected from various geographic regions of Japan, in- cluding Ryukyu and Bonin Islands. Fifteen species of Podospora (the Sor- dariaceae) from numerous collections are described and illustrated. Most of them were also obtained in living cultures. All species are new records in Japan. Generally speaking, animal dungs contain very rich nutritive components which may serve as growth factors for various types of microorganisms. The coprophilous fungi, one of such dung inhabitants, comprise a special group made up of members of several classes ranging through Myxo- mycetes to Basidiomycetes. In their pioneering studies, MASSEE and SAL- MON (1, 2) emphasized that 187 genera and 757 species from coprophilous occurrence had been listed in SACCARDO's Sylloge Fungorum in the early of the present century. These fungi have long attracted many mycologists for more than a hundred years, and a considerably large number of taxonomic papers have been published on them from various areas of the world. Investigations on this fascinating group of fungi were relatively few in Japan. The most extensive work is that of TUBAKI (3), who isolated 16 species belonging to the Hyphomycetes from dung sources in Japan.
    [Show full text]