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Biological Invasions

, Volume 13, Issue 6, pp 1367–1375 | Cite as

A glimpse at future forests: predicting the effects of Phytophthora ramorum on oak forests of southern Appalachia

  • H. L. Spaulding
  • L. K. RieskeEmail author
Original Paper

Abstract

The highly pathogenic Phytophthora ramorum, causal organism of sudden oak death (SOD), is established in forests of the Pacific Northwest (USA) and is threatening invasion of other regions. Given the breadth of its host range, with dozens of asymptomatic ornamental hosts and with oaks, Quercus spp., in the red oak (Erythrobalanus) subgenus particularly susceptible, we investigated the consequences of its invasion and establishment in oak-dominated deciduous forests of the eastern USA. We evaluated the nature and extent of pathogen invasion using vegetation assessments coupled with growth simulations. The woody plant community was assessed in three strata (upper, mid- and lower) and was used to characterize forest composition and structure. Using the Forest Vegetation Simulator (FVS), we then projected woody vegetation growth 50 years into the future with and without the effects of SOD. In forest simulations lacking pathogen invasion, little change in composition or structure is forecasted. Both red oaks and white oaks (subgenus Leucobalanus) increase slightly but significantly over the length of the simulation. In contrast, in SOD-affected forests our projections predict a significant loss of red oaks within 10 years of pathogen invasion. Basal area of white oaks and non-oaks is expected to increase more so in the absence of red oaks. The loss of red oaks to pathogen infection will result in greater increases in red maple, Acer rubrum, and yellow poplar, Liriodendron tulipifera, than in forests free of SOD. Loss of red oak represents a significant loss of hard mast, with potentially devastating consequences for wildlife. Red oak loss will also affect decomposition rates, nutrient cycling, forest structure, and timber values, with consequences for forest health and sustainability.

Keywords

Sudden oak death Quercus Invasive species Forest vegetation simulator Modeling 

Notes

Acknowledgments

We would like to thank Melanie Antonik, Tom Coleman, W. Rodney Cooper, and Aerin Land for assistance, Robert Paratley for help with plant identifications, and Angela Schoergendorfer for statistical advice. Jeffrey Stringer and John Obrycki reviewed an earlier version of this manuscript, and the comments of two anonymous reviewers greatly strengthened this work. This research was supported by funds from the USDA Forest Service Southern Research Station and McIntire Stennis funds from the Kentucky Agricultural Experiment Station, and is published as Experiment Station Project 10-08-046.

References

  1. Abrams MD (2003) Where has all the white oak gone? Bioscience 53:927–938CrossRefGoogle Scholar
  2. Anon (2003) Natural resource information service (NRIS): field sampled vegetation (FSVeg) Common Stand Exam. V1.5.1. USDA Forest Service, Rocky Mountain Research Station, Fort Collins, COGoogle Scholar
  3. Balci Y, Balci S, Eggers J, MacDonald WL (2007) Phytophthora spp. associated with forest soils in eastern and north-central U.S. oak ecosystems. Plant Dis 91:705–710CrossRefGoogle Scholar
  4. Balci Y, Balci S, MacDonald WL, Gottschalk KW (2008) Foliar susceptibility of eastern oak species to Phytophthora infection. Forest Pathol 38:320–331CrossRefGoogle Scholar
  5. Brasier CM, Robredo F, Ferraz JFP (1993) Evidence for Phytophthora cinnamomi involvement in Iberian oak decline. Plant Pathol 42:140–145CrossRefGoogle Scholar
  6. Brasier C, Denman S, Brown A, Webber J (2004) Sudden oak death (Phytophthora ramorum) discovered on trees in Europe. Mycol Res News 108:1108–1110CrossRefGoogle Scholar
  7. Clark FB (1992) An historical perspective of oak regeneration. In: Loftis DL, Mcgee C (eds) Oak regeneration: serious problems, practical recommendations. USDA Gen Tech Rep SE-84, pp. 250–263Google Scholar
  8. Coleman TW, Clarke SR, Meeker JR, Rieske LK (2008) Forest composition following overstory mortality from southern pine beetle and associated treatments. Can J For Res 38:1406–1418CrossRefGoogle Scholar
  9. COMTF (2010) California oak mortality task force. http://www.cnr.berkeley.edu/comtf/. Accessed March 2010
  10. Crookston NL, Dixon GE (2005) The forest vegetation simulator: a review of its structure, content, and applications. Comput Electron Agric 49:60–80CrossRefGoogle Scholar
  11. Davidson JM, Rizzo DM, Garbelotto M, Tjosvold S, Slaughter GW (2002) Phytophthora ramorum and sudden oak death in California: II. Transmission and survival. In: Standiford RB, McCreary D, Purcell KL (eds) (2001) October 22–25; Proceedings of the 5th symposium on oak woodlands: oak woodlands in California’s changing landscape. San Diego, CA, General Technical Report PSW-GTR-184. USDA Forest Service, Pacific Southwest Research Station, Albany, CA, pp. 741–749Google Scholar
  12. Davidson JM, Werres S, Garbelotto M, Hansen EM, Rizzo DM (2003) Sudden oak death and associated diseases caused by Phytophthora ramorum. Plant Health Prog. Online. doi: 10.1094/PHP-2003-0707-01-DG http://hdl.handle.net/10113/11860
  13. Denman S, Kirk SA, Brasier CM, Webber JF (2005) In vitro leaf inoculation studies as an indiction of tree foliage susceptibility to Phytophthora ramorum in the UK. Plant Path 54:512–521CrossRefGoogle Scholar
  14. Dillaway DN, Stringer JW, Rieske LK (2007) Light availability influences root carbohydrates, and potentially vigor, in white oak advance regeneration. For Ecol Manage 250:227–233CrossRefGoogle Scholar
  15. Dixon GE (2002) Internal rep. US Department of Agriculture, Forest Service, Forest Management Service Center, Fort Collins, COGoogle Scholar
  16. Donnelly D, Lilly B, Smith E (2001) Southern (SN) variant overview: forest vegetation simulator. USDA Forest Service Forest Management Service Center, Fort Collins, COGoogle Scholar
  17. Garbelotto M, Svihra P, Rizzo DM (2001) Sudden oak death syndrome fells 3 oak species. Calif Agric 55:9–19CrossRefGoogle Scholar
  18. Gottschalk KW, Courter AW (2007) The gypsy moth event monitor for FVS: a tool for forest and pest managers. In: Gottschalk KW (ed) Proceedings of 17th U.S. department of agriculture interagency research forum on gypsy moth and other invasive species 2006; Gen Tech Rep NRS-P-10. U.S. Department of Agriculture, Forest Service, Northern Research Station: 45, Newtown Square, PAGoogle Scholar
  19. Gottschalk KW, Morin RS, Liebhold AM (2003) Potential susceptibility of eastern forests to sudden oak death, Phytophthora ramorum. 2003 USDA Forest Service FHM Working Group Meeting. http://www.fhm.fs.fed.us/posters/posters03/sod.pdf
  20. Havera SP, Smith KE (1979) A nutritional comparison of selected fox squirrel foods. J Wildl Manage 43:691–704CrossRefGoogle Scholar
  21. Johnson PS, Shifley SR, Rogers R (2002) The ecology and silviculture of oaks. CABI Publishing, New YorkCrossRefGoogle Scholar
  22. Jones J (2009) APHIS Phytophthora ramorum program 2008 year-end summary. USDA-APHIS-PPQ, Riverdale, MD. www.aphis.usda.gov/plant_health/plant_pest_info/pram
  23. Kabrick JM, Dey DC, Jensen RG, Wallendorf M (2008) The role of environmental factors in oak decline and mortality in the Ozark Highlands. For Ecol Manage 255:1409–1417CrossRefGoogle Scholar
  24. Keyser C, Stephens R (2002) Calibrating FVS for the Chattahoochee-Oconee National Forest planning effort. In: Proceedings of the 2nd forest vegetation simulator conference, Fort Collins, CO, 12–14 February 2002. USDA Forest Service Rocky Mountain Research Station, RMRS-P-25, pp. 45–49Google Scholar
  25. McPherson BA, Wood DL, Storer AJ, Svihra P, Rizzo DM, Kelly NM, Standiford RB (2000) Oak mortality syndrome: sudden death of oaks and tanoaks, Tree Notes, California Department of Forestry and Fire Protection No. 26Google Scholar
  26. McQuilkin RA (1990) Chestnut oak. In: Burns RM, Honkala BH (eds) Silvics of North America: 2. Hardwoods. USDA Forest Service Agriculture Handbook 654, Washington, DCGoogle Scholar
  27. McShea WJ, Healy WM, Devers P, Fearer T, Koch FH, Stauffer D, Waldon J (2007) Forestry matters: decline of oaks will impact wildlife in hardwood forests. J Wildlife Manage 71:1717–1728CrossRefGoogle Scholar
  28. Nilsen ET, Walker JF, Miller OK, Semones SW, Lei TT, Clinton BD (1999) Inhibition of seedling survival under Rhododendron maximum (Ericaceae): could allelopathy be a cause? Am J Bot 86:1597–1605PubMedCrossRefGoogle Scholar
  29. Nilsen ET, Clinton BD, Lei TT, Miller OK, Semones SW, Walker FJ (2001) Does Rhododendron maximum L. (Ericaceae) reduce the availability of resources above and belowground for canopy tree seedlings? Am Midl Nat 145:325–343CrossRefGoogle Scholar
  30. O’Brien JG, Mielke ME, Oak S, Moltzan B (2002) Sudden oak death. Pest Alert NA-PR-02-02Google Scholar
  31. Rogers R (1990) White oak. In: Burns RM, Honkala BH (eds) Silvics of North America: 2. Hardwoods. USDA Forest Service Agriculture Handbook 654, Washington, DCGoogle Scholar
  32. Smith HC (1990) Mockernut hickory. In: Burns RM, Honkala, BH (eds) Silvics of North America: 2. Hardwoods. USDA Forest Service Agriculture Handbook 654, Washington, DCGoogle Scholar
  33. Spaulding HL (2009) Forests of the future: simulating the effects of exotic invasive species on forest structure and composition. MS Thesis, Department of Entomology, University of Kentucky, Lexington, 99 pGoogle Scholar
  34. Spaulding HL, Rieske LK (2010) The aftermath of an invasion: structure and composition of Central Appalachian hemlock forests following establishment of the hemlock woolly adelgid, Adelges tsugae. Biol Inv. doi:  10.1007/s10530-010-9704-0
  35. Starkey DA, Oak SW (1989) Site factors and stand conditions associated with oak decline in southern upland hardwood forests. In: Rink G, Budelsky CA (eds) Proceedings of 7th central hardwood conference, 5–8 March 1989, Carbondale, IL. USDA Forest Service, NC Forest Exp Sta, Gen Tech Rep NC-132, St. Paul, MN, pp. 95–102Google Scholar
  36. Tooley PW, Kyde KL (2007) Susceptibility of some eastern forest species to Phytophthora ramorum. Plant Dis 91:435–438CrossRefGoogle Scholar
  37. USDA (2005) Phytophthora ramorum: stopping the spread. USDA APHIS Program Aid No. 1842Google Scholar
  38. USDA (2010) APHIS list of regulated hosts and plants associated with Phytophthora ramorum. http://www.aphis.usda.gov/plant_health/plant_pest_info/pram/. Accessed March 2010
  39. Venette RC, Cohen SD (2006) Potential climatic suitability for establishment of Phytophthora ramorum within the contiguous United States. For Ecol Manage 231:18–26CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Department of EntomologyUniversity of KentuckyLexingtonUSA

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