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Wetlands

, Volume 20, Issue 1, pp 169–176 | Cite as

Downed wood in Micronesian mangrove forests

  • James A. AllenEmail author
  • Katherine C. Ewel
  • Bobby D. Keeland
  • Tara Tara
  • Thomas J. Smith

Abstract

Dead, downed wood is an important component of upland forest and aquatic ecosystems, but its role in wetland ecosystems, including mangroves, is poorly understood. We measured downed wood in ten sites on the western Pacific islands of Kosrae, Pohnpei, and Yap, all located within the Federated States of Micronesia. Our goals were to examine patterns of variability in the quantity of downed wood in these mangrove ecosystems, provide a general characterization of downed wood in a region with no previously published accounts, and investigate the relationship between harvesting practices and the amount of downed wood. The overall mean volume of downed wood at our study sites was estimated to be 60.8 m3 ha−1 (20.9 t ha−1), which is greater than most published data for forested wetlands. There were significant differences among islands, with the sites on Kosrae (104.2 m3 ha−1) having a much greater mean volume of downed wood than those on Pohnpei (43.1 m3 ha−1) or Yap (35.1 m3 ha−1). Part of the difference among islands may be attributable to differences in stand age and structure, but the most important factor seems to be the greater amount of wood harvesting on Kosrae, coupled with a low efficiency of use of cut trees. Of a total of 45 cut trees examined on Kosrae, no wood had been removed from 18 (40%); these are believed to be trees cut down because other, more valuable, trees were caught on them as they were felled. Of the other 27 trees, only 24 to 42% of the stem volume (to a 10 cm top) was removed from the forest, the amount varying by species. The impacts of current harvesting practices are unknown but may include important effects on tree regeneration and the abundance and species composition of crab populations.

Key words

coarse woody debris Federated States of Micronesia harvesting impacts Kosrae Pohnpei Yap 

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Literature cited

  1. Benke, A. C., R. L. Henry III, D. M. Gillespie, and R. J. Hunter. 1985. Importance of snag habitat for animal production in southeastern streams. Fisheries 10:8–12.CrossRefGoogle Scholar
  2. Bilby, R. E. and G. E. Likens. 1980. Importance of organic debris dams in the structure and function of stream ecosystems. Ecology 61:1107–1113.CrossRefGoogle Scholar
  3. Brown, J. K. 1974. Handbook for inventorying downed woody material. U.S.D.A. Forest Service, Intermountain Forest and Range Experiment Station, Ogden, Utah, USA. General Technical Report INT-16.Google Scholar
  4. Brown, J. K. and P. J. Roussopoulos. 1974. Eliminating biases in the planar intersect method for estimating volumes of small fuels. Forest Science 20:350–356.Google Scholar
  5. Cole, T. G., K. C. Ewel, and N. N. Devoe. 1998. Structure of mangrove trees and forests in Micronesia. Forest Ecology and Management 117:95–109.CrossRefGoogle Scholar
  6. Cragg, S. M. 1993. Wood break-down in mangrove ecosystems: a review. Papua New Guinea Journal of Agriculture, Forestry and Fisheries 36:30–39.Google Scholar
  7. Devoe, N. N. 1994. Mangrove exploitation and conservation in the Federated States of Micronesia. ISLA: A Journal of Micronesian Studies 2:67–82.Google Scholar
  8. Duke, N. C. 1999. The 1998 survey of Rhizophora species in micronesia. Report to U.S.D.A. Forest Service, Institute of Pacific Islands Forestry, Honolulu, HI, USA.Google Scholar
  9. Everham, E. M., III and N. V. L. Brokaw. 1996. Forest damage and recovery from catastrophic wind. The Botanical Review 62:113–185.CrossRefGoogle Scholar
  10. Ewel, K. C., J. A. Bourgeois, T. G. Cole, and S. Zheng. 1998a. Variation in environmental characteristics and vegetation in high-rainfall mangrove swamps in Kosrae, Micronesia. Global Ecology and Biogeography Letters 7:49–56.CrossRefGoogle Scholar
  11. Ewel, K. C., S. Zheng, Z. Pinzón, and J. A. Bourgeois. 1998b. Environmental effects of canopy gap formation in high-rainfall mangrove swamps. Biotropica 30:510–518.CrossRefGoogle Scholar
  12. Falanruw, M. C., C. D. Whitesell, T. G. Cole, C. D. MacLean, and A. H. Ambacher. 1987. Vegetation survey of Yap, Federated States of Micronesia. U.S.D.A. Forest Service, Pacific Southwest Forest and Range Experiment Station, Berkeley, CA, USA. Resource Bulletin PSW-21.Google Scholar
  13. Fujimoto, K., R. Tabuchi, T. Mori, and T. Murofushi. 1995. Site environments and stand structure of the mangrove forests on Pohnpei Island, Micronesia. Japan Agricultural Research Quarterly 29:275–284.Google Scholar
  14. Green, P. and G. F. Peterken. 1997. Variation in the amount of dead wood in the woodlands of the Lower Wye Valley, UK in relation to the intensity of management. Forest Ecology and Management 98:229–238.CrossRefGoogle Scholar
  15. Gregory, S. V., F. J. Swanson, W. A. McKee, and K. W. Cummins. 1991. An ecosystem perspective of riparian zones. Bioscience 41: 540–550.CrossRefGoogle Scholar
  16. Harmon, M. E. and C. Hua. 1991. Coarse woody debris dynamics in two old-growth ecosystems. Bioscience 41:604–610.CrossRefGoogle Scholar
  17. Harmon, M. E., J. F. Franklin, F. J. Swanson, P. Sollins, S. V. Gregory, J. D. Lattin, N. H. Anderson, S. P. Cline, N. G. Aumen, J. R. Sedell, G. W. Lienkaemper, K. Cromack, Jr., and K. W. Cummins. 1986. Ecology of coarse woody debris in temperate ecosystems. Advances in Ecological Research 15:133–302.CrossRefGoogle Scholar
  18. Harmon, M. E., D. F. Whigham, J. Sexton, and I. Olmstead. 1995. Decomposition and mass of woody detritus in the dry tropical forests of the northeastern Yucatan Peninsula, Mexico. Biotropica 27:305–316.CrossRefGoogle Scholar
  19. Hezel, F. X. 1995. Strangers in their own land: a century of colonial rule in the Caroline and Marshall Islands. University of Hawaii Press, Honolulu, HI, USA.Google Scholar
  20. Huenneke, L. F. and R. R. Sharitz. 1990. Substrate heterogeneity and regeneration of a swamp tree, Nyssa aquatica. American Journal of Botany 77:413–419.CrossRefGoogle Scholar
  21. Jiménez, J. A., A. E. Lugo, and G. Cintrón. 1985. Tree mortality in mangrove forests. Biotropica 17:177–185.CrossRefGoogle Scholar
  22. Kirby, K. J., C. M. Reid, R. C. Thomas, and F. B. Goldsmith. 1998. Preliminary estimates of fallen dead wood and standing dead trees in managed and unmanaged forests in Britian. Journal of Applied Ecology 35:148–155.CrossRefGoogle Scholar
  23. Lal, P. N. 1990. Utilization and management of coastal wetland resources in Kosrae. University of Hawaii Sea Grant Program, Honolulu, HI, USA. Working paper.Google Scholar
  24. Lee, P. C., S. Crites, M. Nietfeld, H. V. Nguyen, and J. B. Stelfox. 1997. Characteristics and origins of deadwood material in aspendominated boreal forests. Ecological Applications 7:691–701.CrossRefGoogle Scholar
  25. Lugo, A. E. 1997. Old-growth mangrove forests in the United States. Conservation Biology 11:11–20.CrossRefGoogle Scholar
  26. Lugo, A. E. and S. C. Snedaker. 1974. The ecology of mangroves. Annual Review of Ecology and Systematics 5:39–64.CrossRefGoogle Scholar
  27. MacLean, C. D., T. G. Cole, C. D. Whitesell, M. V. Falanruw, and A. H. Ambacher. 1986. Vegetation survey of Pohnpei, Federated States of Micronesia. U.S.D.A. Forest Service, Pacific Southwest Forest and Range Experiment Station, Berkeley, CA, USA. Resource Bulletin PSW-18.Google Scholar
  28. MacLean, C. D., C. D. Whitesell, T. G. Cole, and K. E. McDuffie. 1988. Timber resources of Kosrae, Pohnpei, Truk, Yap, Federated States of Micronesia. U.S.D.A. Forest Service Pacific Southwest Forest and Range Experiment Station, Berkeley, CA, USA. Resource Bulletin PSW-24.Google Scholar
  29. McMinn, J. W. and D. A. Crossley, Jr. 1996. Biodiversity and coarse woody debris in southern forests. Proceedings of the Workshop on Coarse Woody Debris in Southern Forests: Effects on Biodiversity. U.S.D.A. Forest Service Southern Research Station, Asheville, NC, USA. General Technical Report SE-94.Google Scholar
  30. Naylor, R. and M. Drew. 1998. Valuing mangrove resources in Kosrae, Micronesia. Environmental and Development Economics 3: 471–490.CrossRefGoogle Scholar
  31. Pinzón, Z. S. 1998. Canopy dynamics and regeneration in mangrove forests in Micronesia. M.S. Thesis. University of Florida, Gainesville, FL, USA.Google Scholar
  32. Polit, J. I. and S. Brown. 1996. Mass and nutrient content of dead wood in a central Illinois floodplain forest. Wetlands 16:488–494.Google Scholar
  33. Ray, B. 1997. Global tracks. Typhoon tracking software, Version 2.1a. Hyperlink: http://www.gtracks.com. Includes data from U.S. National Hurricane Center, Guam Joint Typhoon Warning Center, Purdue University and other university databases.Google Scholar
  34. Robertson, A. I. 1986. Leaf-burying crabs: their influence on energy flow and export from mixed mangrove forests (Rhizophora spp.) in northeastern Australia. Journal of Experimental Marine Biology and Ecology 102:237–248.CrossRefGoogle Scholar
  35. Robertson, A. I. and P. A. Daniel. 1989a. Decomposition and the annual flux of detritus from fallen timber in tropical mangrove forests. Limnology and Oceanography 34:640–646.CrossRefGoogle Scholar
  36. Robertson, A. I. and P. A. Daniel. 1989b. The influence of crabs on litter processing in high intertidal mangrove forests of tropical Australia. Oecologia 78:191–198.CrossRefGoogle Scholar
  37. Robertson, A. I., D. M. Alongi, and K. G. Boto. 1992. Food chains and carbon fluxes. p. 293–326. In A. I. Robertson and D. M. Alongi (eds.) Tropical Mangrove Ecosystems. American Geophysical Union, Washington, DC, USA.Google Scholar
  38. Smith, T. J., III and N. C. Duke. 1987. Physical determinants of inner estuary variation in mangrove species richness around the tropical coastline of Australia. Journal of Biogeography 14:9–19.CrossRefGoogle Scholar
  39. Smith, T. J., III, M. B. Robblee, H. R. Wanless, and T. W. Doyle. 1994. Mangroves, hurricanes, and lightning strikes. Bioscience 44:256–262.CrossRefGoogle Scholar
  40. Spies, T. A., J. F. Franklin, and T. B. Thomas. 1988. Coarse woody debris in Douglas-fir forests of western Oregon and Washington. Ecology 69:1689–1702.CrossRefGoogle Scholar
  41. Sturtevant, B. R., J. A. Bissonette, J. N. Long, and D. W. Roberts. 1997. Coarse woody debris as a function of age, stand structure, and disturbance in boreal Newfoundland. Ecological Applications 7:702–712.CrossRefGoogle Scholar
  42. Twilley, R. R., A. E. Lugo, and C. Patterson-Zucca. 1986. Litter production and turnover in basin mangrove forests in southwest Florida. Ecology 67:670–683.CrossRefGoogle Scholar
  43. Van Wagner, C. E. 1968. The line intersect method in forest fuel sampling. Forest Science 14:20–26.Google Scholar
  44. Wei, X., J. P. Kimmins, K. Peel, and O. Steen. 1997. Mass and nutrients in woody debris in harvested and wildfire-killed lodge-pole pine forests in the central interior of British Columbia. Canadian Journal of Forest Research 27:148–155.CrossRefGoogle Scholar
  45. Whitesell, C. D., C. D. MacLean, M. C. Falanruw, T. G. Cole, and A. Ambacher. 1986. Vegetation survey of Kosrae, Federated States of Micronesia. U.S.D.A. Forest Service Pacific Southwest Forest and Range Experiment Station. Berkeley, CA, USA. Resource Bulletin PSW-17.Google Scholar
  46. Woodroffe, C. 1992. Mangrove sediments and geomorphology. p. 7–41. In A.I. Robertson and D.M. Alongi (eds.) Tropical Mangrove Ecosystems. Coastal and Estuarine Studies 41, American Geophysical Union, Washington, DC, USA.Google Scholar

Copyright information

© Society of Wetland Scientists 2000

Authors and Affiliations

  • James A. Allen
    • 1
    Email author
  • Katherine C. Ewel
    • 1
  • Bobby D. Keeland
    • 2
  • Tara Tara
    • 3
  • Thomas J. Smith
    • 4
  1. 1.U.S.D.A. Forest ServicePacific Southwest Research Station Institute of Pacific Islands ForestryHonoluluUSA
  2. 2.U.S. Geological SurveyNational Wetlands Research CenterLafayetteUSA
  3. 3.Kosrae State Department of Agriculture and Land Forestry SectionKosraeFederated States of Micronesia
  4. 4.U.S. Geological Survey, Florida/Caribbean Science Center, c/o SERC, OE-148Florida International UniversityMiamiUSA

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