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Eradication of the Invasive Tree Species Bischofia javanica and Restoration of Native Forests on the Ogasawara Islands

  • Nobuyuki Tanaka
  • Keita Fukasawa
  • Kayo Otsu
  • Emi Noguchi
  • Fumito Koike

Abstract

Bischofia javanica is the most invasive alien tree species on the Ogasawara Islands; it is seen as a significant problem for biodiversity conservation. B. javanica has colonized four Ogasawara islands, namely, Ototojima, Chichijima, Hahajima and Hirashima. On Ototojima, B. javanica was never abundant and has been almost eliminated through actions of an eradication project operating since 2005. However, larger numbers of the alien trees are distributed over wider areas on Chichijima and Hahajima, and eradication will be problematic. Aerial images captured in 2003 showed that the invaded areas on Chichijima and Hahajima covered 50.9 ha (2.1%) and 296.5 ha (14.7%) of the islands, respectively. The potentially invasible habitat area on Hahajima was estimated to be 59.2% of terrain (judged from the vegetation type distribution on the island). A model predicting the alien tree's distribution on Hahajima was developed by mapping environmental factors (elevation, slope, drainage basin, curvature, and topographic openness) and distance from seed source. We developed an occurrence probability map (potential habitat map) estimated solely from measured environmental factors. The expected risk of invasion was estimated by comparing present distributions with potential habitat areas. A survey of forest development after clear-cutting B. javanica stands demonstrated natural regeneration potential in a diversity of native tree species. Based on available ecological knowledge and the results of eradication projects, we propose a management system aiming to eradicate B. javanica from whole island systems.

Keywords

Mother Tree Potential Habitat Native Tree Species Seed Supply Forestry Agency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This research was partly funded by the Ministry of the Environment under the Global Environment Research Coordination System. Distribution maps were supplied by the Ministry of the Environment and the Kanto Regional Forest Office.

References

  1. Agriculture, Forestry and Fisheries Research Council (2001) Research on management technologies of forest ecosystems in Ogasawara. Kenkyu-seika 375 (in Japanese)Google Scholar
  2. Forestry Agency of Japan (1994) Investigative report on reproduction control of alien tree species (Bischofia javanica) in Ogasawara. Forestry Agency of Japan (in Japanese)Google Scholar
  3. Hata K, Suzuki J, Kachi N, Yamamura Y (2006) A 19-year study of the dynamics of an invasive alien tree, Bischofia javanica, on a subtropical oceanic island. Pac Sci 60:455–470CrossRefGoogle Scholar
  4. Higgins SI, Richardson DM, Cowling RM, Trinder-Smith TH (1999) Predicting the landscape-scale distribution of alien plants and their threat to plant diversity. Conserv Biol 13:303–313CrossRefGoogle Scholar
  5. Ito T (2004) Effects of simultaneous application glyphosate formulation with girdling or cutting on Bischofia javanica. Nichirin-kanto-shiron 55:143–144 (in Japanese)Google Scholar
  6. Ito T (2005) Survey of effective herbicides for direct injection on Bischofia javanica Blume seedlings. J Weed Sci Technol 50:18–20 (in Japanese)CrossRefGoogle Scholar
  7. Ito T, Otsu K (2007) Combination of felling and herbicide to control upper story trees of akagi ( Bischofia javanica Blume) on the Bonin Islands. Kanto-shinrin-kenkyu 58:249–250 (in Japanese)Google Scholar
  8. Ito T, Otsu K, Okuda S, Kushima H (2009) Developing a technique for killing Bischofia javanica by chemicals on Ogasawara. Global Env Res 14:80–81 (in Japanese)Google Scholar
  9. Itow S (1994) Plant history of islands. Kodan-sha, Tokyo (in Japanese)Google Scholar
  10. Japan Forest Technology Association (2004) Investigative report for nature restoration plan in Ogasawara, Heisei-15 vol 1. NatureGoogle Scholar
  11. Conservation Bureau, Ministry of the Environment, Tokyo (in Japanese)Google Scholar
  12. Japan Forest Technology Association (2006) Investigative report for nature restoration plan on Ogasawara, Heisei-17. Nature Conservation Bureau, Ministry of the Environment, Tokyo (in Japanese)Google Scholar
  13. Kanto Regional Forest Office (2008) Investigative report for the eradication plan for the alien plant species, Bischofia javanica. Kanto Regional Forest Office, Gunma (in Japanese)Google Scholar
  14. Kanto Regional Forest Office and Japan Forestry Foundation (2004) Investigative report on monitoring of Bischofia javanica-controlled sites. Kanto Regional Forest Office, Gunma (in Japanese)Google Scholar
  15. Kawahara T, Yoshimaru H (2002) Ogasawara-guwa. Sinrin-kagaku 34:14–18 (in Japanese)Google Scholar
  16. Kriticos DJ, Sutherst RW, Brown JR, Adkins SW, Maywald GF (2003) Climate change and the potential distribution of an invasive alien plant: Acacia nilotica ssp. indica in Australia. J Appl Ecol 40:111–124CrossRefGoogle Scholar
  17. Ministry of the Environment (2007) Master plan on conservation and restoration of natural environment on Ogasawara. Ministry of the Environment, Tokyo (in Japanese)Google Scholar
  18. Murakami O, Washitani I (2002) 100 of Japan's worst invasive alien species. In: Ecological Society of Japan (ed) Handbook of alien species in Japan. Chijin Shokan, Tokyo, p.362–363 (in Japanese)Google Scholar
  19. Myers JH, Bazely D (2003) Ecology and Control of Introduced Plants. Cambridge Univ Press, Cambridge, UKCrossRefGoogle Scholar
  20. Okutomi K, Iseki T, Hioki Y, Kitayama K, Sumihiro H (1985) Vegetation of the Ogasawara Islands. In: Ono M, Okutomi K (eds) Endemic species and vegetation of the Bonin Island. Kanagawa, Aboc-sha, pp 97–262 (in Japanese)Google Scholar
  21. Otsu K, Ito T (2007) The effort for akagi eradication on Ototojima of Ogasawara Islands. Kanto-shinrin-kenkyu 58:251–252 (in Japanese)Google Scholar
  22. Shimizu Y (1988) Vegetation of Mt. Kuwanoki on the Bonin (Ogasawara) Islands with reference to the invasion of an introduced tree species (Bischofia javanica). Regional Views, Komazawa Univ. 1:31–46 (in Japanese)Google Scholar
  23. Shimizu Y (1989) Ecological characteristics of forest vegetation in the oceanic islands, Ogasawara. In: Miyawaki A (ed) Vegetation of Japan, Vol.10: Okinawa and Ogasawara. Shibundo, Tokyo, p.159–203 (in Japanese)Google Scholar
  24. Shimizu Y (2002) Alien trees on Ogasawara: irreversible damage. In: Ecological Society of Japan (ed) Handbook of alien species in Japan, Chijin Shokan, Tokyo, p.242–243 (in Japanese)Google Scholar
  25. Tanaka N (2002) Current situation and recommendations on conservation of forest ecosystems on the Ogasawara Islands. Sinrin-kagaku 34:40–46 (in Japanese)Google Scholar
  26. Tanaka N (2003) Akagi (Bischofia javanica). In: Japan Forest Technology Association (ed) Investigative report for nature restoration plan on Ogasawara, Heisei-14:i41–i68 (in Japanese)Google Scholar
  27. Tanaka N (2004) Eradication of Bischofia javanica and restoration of native forests. In: Kanagawa Prefectural Museum of Natural History (ed) Ogasawara, Galapagos in the East: charming endemic species and their crisis. Kanagawa Pref Mus Nat His, Kanagawa, pp 158–161 (in Japanese)Google Scholar
  28. Tanaka N (2005) Invasion of Bischofia javanica and forest ecosystem management on the Ogasawara Islands. In: Ohsawa M (ed) Monitoring of plant communities for nature conservation. Bun-ichi Sogo Shyuppan, Tokyo, pp 157–161 (in Japanese)Google Scholar
  29. Tanaka N, Sakurai S (1996) Akagi (Bischofia javanica Bl.). In: Mori T et al (eds) Silvics of tropical trees, vol 1. Japan International Forestry Promotion & Cooperation Center, Tokyo (in Japanese)Google Scholar
  30. Tani N (2003) Endangered trees in Japan (6) Ogasawara-guwa. For Tree Breed 206:29–33 (in Japanese)Google Scholar
  31. Tanimoto T, Toyoda T (1996) Survivorship and growth of akagi (Bischofia javanica Bl.) seedlings under the forest canopy and different temperature conditions. Bull FFPRI 370:1–19 (in Japanese with English abstract)Google Scholar
  32. Tokyo Branch of Kanto Regional Forest Office (2000) Investigative report for conservation of a rare species, Columba janthina nitens. Kanto Regional Forest Office, Gunma (in Japanese)Google Scholar
  33. Toyoda T (1975) Vegetation of national forest and forest reserve for studies in Ogasawara. Tokyo Regional Forestry Office, Tokyo (in Japanese)Google Scholar
  34. Toyoda T (1981) Flora of the Bonin Islands. Aboc-sha, Kanagawa (in Japanese)Google Scholar
  35. Toyoda T, Kawaoka H (2005) Decline of native tree species with increase of canopy occupancy of Bischofia javanica. Ogasawara Kenkyu Nenpo 28:73–85Google Scholar
  36. Toyoda T, Tanimoto T (1991) Regeneration of Bischofia javanica seedlings and light intensity in the forest floor. Nichirin-kanto-shiron 42:29–32 (in Japanese)Google Scholar
  37. Uchida T (2002) Conservation in Ogasawara National Forests. Sinrin-kagaku 34:35–39 (in Japanese)Google Scholar
  38. Yamashita N (2002) Akagi. Sinrin-kagaku 34:9–13 (in Japanese)Google Scholar
  39. Yamashita N, Abe T (2002) Size distribution, growth and inter-year variation in sex expression of Bischofia javanica, an invasive tree. Ann Bot Lond 90:599–605CrossRefGoogle Scholar
  40. Yamashita N, Ishida A, Kushima H, Tanaka N (2000) Acclimation to sudden increase in light favoring an invasive over native trees in subtropical islands, Japan. Oecologia 125:412–419CrossRefGoogle Scholar
  41. Yamashita N, Tanaka N, Hoshi Y, Kushima H, Kamo K (2003) Comparative seed and seedling demography of invasive and native trees of subtropical Pacific Islands, Japan. J Veg Sci 14:15–24CrossRefGoogle Scholar
  42. Yoneyama S (2002) Noyaku-binran, version 9. Rural Culture Association, Tokyo (in Japanese)Google Scholar

Copyright information

© Springer 2010

Authors and Affiliations

  • Nobuyuki Tanaka
    • 1
  • Keita Fukasawa
    • 2
  • Kayo Otsu
    • 3
  • Emi Noguchi
    • 3
  • Fumito Koike
    • 2
  1. 1.Forestry and Forest Products Research InstituteTsukubaJapan
  2. 2.Graduate School of Environment and Information SciencesYokohama National UniversityHodogaya-ku, YokohamaJapan
  3. 3.Japan Forest Technology AssociationChiyoda-kuJapan

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