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Global Forest Resources Assessment 2005 Thematic Forestry Department Food and Agriculture Organization of the United Nations GLOBAL FOREST RESOURCES ASSESSMENT 2005 THEMATIC STUDY ON MANGROVES JAPAN COUNTRY PROFILE DRAFT, AUGUST 2005 Forest Resources Development Service Forestry Department Forest Resources Division FAO, Rome (Italy) DISCLAIMER The designation employed and the presentation of materials in this information product do not imply the expression of any opinion or whatsoever on the part of the Food and Agriculture Organization of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. This paper does not reflect any official position of FAO. Please refer to the FAO website (www.fao.org/fo) for official information. The purpose of this paper is to provide early information on on-going activities and programmes, to facilitate dialogue, and to stimulate discussion. Contact person: Mette Løyche Wilkie, Senior Forestry Officer Global Forest Resources Assessment Forest Resources Division Forestry Department FAO Viale delle Terme di Caracalla Rome 00100 (Italy) E-mail:[email protected] © FAO 2005 INTRODUCTION Mangroves are found along sheltered coastlines in the tropics and sub-tropics where they fulfil important functions in terms of providing wood and non-wood forest products, coastal protection, conservation of biological diversity and provision of habitat, spawning grounds and nutrients for a variety of fish and shellfish. High population pressure in coastal areas has led to the conversion of many mangrove areas to other uses and numerous case studies describe mangrove losses over time. However, information on status and trends at the global level is scarce. The first attempt at estimating the total mangrove area in the world was undertaken as part of the FAO/UNEP Tropical Forest Resources Assessment in 1980, where the world total was estimated as 15.6 million hectares. More recent estimates range from 12 to 20 million ha. For many of these studies, countries with small areas of mangroves were excluded due to lack of information and because their combined area of mangroves would not significantly affect the world total. A recent initiative by FAO aimed at facilitating access to comprehensive information on the current and past extent of mangroves in 121 countries and areas (FAO. 2003). This built on the earlier FAO/UNEP assessment and on the recent FAO Global Forest Resources Assessment 2000 (FRA 2000). An extensive literature search yielded additional information. More than 2800 national and sub-national datasets were collected, with the earliest estimates dating back to 1918. One of the results was an updated list of the most reliable, recent estimate for each country, mostly based on inventories or analysis of remote sensing imagery. Regression analyses based on earlier data provided estimates for 1990 and 1980 and an extrapolated estimate for 2000 for each country. The preliminary results of this initiative showed that mangrove deforestation continues, albeit on a slightly lower rate in the 1990s than in the 1980s. The relatively large mangrove deforestation rates in Asia, the Caribbean and Latin America in the 1980s reflect large-scale conversion of mangroves for aquaculture and tourism infrastructure. Most countries have now banned the conversion of mangroves for aquaculture purposes and require environmental impact assessments prior to large-scale conversion of mangroves areas for other uses. In order to provide the most accurate and comprehensive evaluation of current mangrove status, FAO is presently updating the above cited preliminary results, which have been sent out to all countries and areas in which they exist (124) for information and validation. Additional literature search, active collaboration with national and international mangrove experts and the use of remote sensing imagery interpretation, have further supported the preparation of the final report, which will be published in 2005. Readers are strongly encouraged to provide feedback and additional information to help update and improve this database for the benefit of all those who may have an interest in mangroves. Japan Vegetation description Mangroves are distributed in the prefectures of Okinawa (Iriomote, Ishigaki, Miyako and Okinawa islands) and Kagoshima. Japanese mangroves are the northernmost in Asia, at latitude 31'22'N (Kiire). The total area is small and it is largely concentrated on the islands of Ishigaki and Iriomote, where the largest and most diverse communities (eleven true mangroves species) have been recorded. A few strong typhoons pass over the Ryukyu Islands every year, limiting tree height to around 10-15 m and in some areas to shrub formations. Uses and threats Some traditional use of mangroves for tannins was recorded on Iriomote until just after 1945. Over the last decades some areas have been damaged for urban development and road construction, however currently mangroves in this country do not face serious threats and they are quite well conserved. Okinawa prefecture and local governments, together with non- governmental organizations have started activities to conserve and restore mangrove ecosystems which are now colonizing new areas through natural regeneration. In addition to that some small areas have been planted for education purposes in Okinawa, Ishigaki and Iriomote islands. A traditional proverb is often cited "no forest on the land, no fish in the sea” showing an ancient awareness of the importance of mangroves for this country. Baba, S. 2004. Information provided for the Global Forest Resources Assessment (FRA) 2005 thematic study on mangroves. Unpublished. Spalding, M.D., Blasco, F. & Field, C.D., eds. 1997 World Mangrove Atlas. The International Society for Mangrove Ecosystems, Okinawa, Japan. 178 pp. 1 National level mangrove estimates In order to provide the whole range of the information currently available on mangrove area extent for this country, all the national level mangrove area estimates collected so far have been reported in the following table. Differences in methodologies, classifications, mapping scales etc. may have led to discrepancies in figures, thus only the estimates considered as the most accurate and reliable (marked in the Trend column in this table) have been used for the analysis of the area changes over time. Area Year Source Trend Methodology/Comments (ha) 1980 400 Nakasuga, 1980. Personal Expert estimate. communication Cited in: Snedaker, S.C. 1984. The mangroves of Asia and Oceania: status and research planning. In: Proceedings of the Asian Mangrove Symposium, eds: Soepadmo, E Rao, AN; McIntosh, DJ. p. 5-15. Percetakan Ardyas Sdn Bhd. Kuala Lumpur, 25-29 August 1980, Kuala Lumpur, Malaysia. 1986 750 Spalding, M.D., Blasco, F. and Map analysis. Mangroves of Iriomote Island Field, C.D., eds. 1997. World digitised from 1:50 000 map appended to Mangrove Atlas. The International Aramoto. 1986 Map of Land Utilisation of Society for Mangrove Ecosystems, Iriomote Island. Mangroves for the remainder Okinawa, Japan. 178 pp. of the islands around Okinawa were digitised from the Environment Agency (1981-87), whilst location of mangrove areas not covered on these maps were gathered from approximate distribution maps provided by Dr Shigeyuki Baba (June, 1995). Aramoto, M. 1986. Iriomote-jima wo chusin to shita shigen shokubutsu huzon genkyo (Bio- resources distribution in Iriomote Island, Okinawa). Published by Chiiki-sanjyo-gijutsu- shinko-kai, Okinawa Japan. 97pp. Environment Agency. 1981-87. Actual Vegetation Map, Okinawa 1-29. 1:50 000. The Third National Survey on the Natural Environment (Vegetation). Environment Agency, Japan. (29-map series on 26 sheets). 2005 800 Baba, S. 2004. Information X Preliminary results of national level mangrove provided for the Global Forest inventory. Aerial photography and field check Resources Assessment (FRA) 2005 thematic study on mangroves. Unpublished. 2 Mangrove species checklist Following Tomlinson 1987 classification, mangroves may be divided into three groups according to their features: major elements (strict or true mangroves), minor elements and mangrove associates. Tomlinson list of true mangrove species have been here modified by adding some species commonly found as exclusive mangrove species (Saenger et al. 1983) In the context of this assessment, only true mangroves species will be reported: Acrostichum aureum Avicennia marina Bruguiera gymnorrhiza Excoecaria agallocha Heritiera littoralis Kandelia candel Lumnitzera racemosa Nypa fruticans Pemphis acidula Rhizophora stylosa Sonneratia alba 3 Trends inmangroveareaextent overtime ar mangrove the in occurred have to seem changes significant Even though mangrove traditionaluse exists,natural the regene 1000 100 200 300 400 500 600 700 800 900 ha Figures used for trends 1980 800 1981 1982 1983 1984 1985 1986 1987 Figures not used for trends 1988 1989 ea extent this country in over the lasttwenty years. rationreforestation and activitieschanges the balancedfew the 1990 800 1991 Year 1992 1993 1994 1995 Calculated estimates Calculated 1996 1997 1998 1999 2000 800 2001 occurred in the country. Consequently no Consequently country. the in occurred 2002 Trend 2003 2004 2005 800 Summary status of mangrove area extent over time Mangrove Mangrove Mangrove Mangrove Most reliable, recent mangrove area area area area area estimate estimate estimate estimate estimate 1980 1990 2000 2005 ha year ha ha ha ha Japan 800 2005
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