Landscape Ecology

, Volume 22, Issue 4, pp 589–599

Effects of surrounding urbanization on non-native flora in small forest patches

  • Stéphanie Duguay
  • Felix Eigenbrod
  • Lenore Fahrig
Research Article


The purpose of our study was to compare the number, proportion, and species composition of introduced plant species in forest patches situated within predominantly forested, agricultural, and urban landscapes. A previous study suggested that agricultural landscape context does not have a large effect on the proportion of introduced species in forest patches. Therefore, our main goal was to test the hypothesis that forest patches in an urban landscape context contain larger numbers and proportions of non-native plant species. We surveyed the vegetation in 44 small remnant forest fragments (3–7.5 ha) in the Ottawa region; 15 were situated within forested landscapes, 18 within agricultural landscapes, and 11 within urban landscapes. Forest fragments in urban landscapes had about 40% more introduced plant species and a 50% greater proportion of introduced plant species than fragments found in the other two types of landscape. There was no significant difference in the number or proportion of introduced species in forest fragments within forested vs. agricultural landscapes. However, the species composition of introduced species differed among the forest patches in the three landscape types. Our results support the hypothesis that urban and suburban areas are important foci for spread of introduced plant species.


Forest plants Forest flora Forest vegetation Introduced species Non-native species Landscape context Urbanization Species richness Forest patch Forest fragmentation 


  1. Arevalo JR, Delgado JD, Otto R, Naranjo A, Salas M, Fernandez-Palacios JM (2005) Distribution of alien vs native plant species in roadside communities along an altitudinal gradient in Tenerife and Gran Canaria (Canary Islands). Perspect Plant Ecol Evol Syst 7:185–202CrossRefGoogle Scholar
  2. Beckstead J, Augspurger CK (2004) An experimental test of resistance to cheatgrass invasion: limiting resources at different life stages. Biol Invas 6:417–432CrossRefGoogle Scholar
  3. Bonham CD (1989) Measurements for terrestrial vegetation. John Wiley and Sons Inc, New York, USAGoogle Scholar
  4. Boutin C, Jobin B (1998) Intensity of agricultural practices and effects on adjacent habitats. Ecol Appl 8:544–557CrossRefGoogle Scholar
  5. Cadotte MW, Lovett-Doust J (2001) Ecological and taxonomic differences between native and introduced plants of southwestern Ontario. Ecoscience 8:230–238Google Scholar
  6. Canada Surveys and Mapping Branch (1933–1968) National topographic systems maps. Ottawa Region, 31 F/8, 31 F/9, 31 G/3, 31 G/4, 31 G/5, 31 G/6, 31 G/11, 31 G/12 [maps]. Editions 1 to 7. 1:50,000. Government of Canada, Surveys and Mapping Branch, Ottawa, Ontario, CanadaGoogle Scholar
  7. Chambers B, Legasy K, Bentley CV, La-Belle Beadman S, Thurley E (1996) Forest plants of Central Ontario. Lone Pine Publishing, Edmonton, Alberta, CanadaGoogle Scholar
  8. Charbonneau NC, Fahrig L (2004) Influence of canopy cover and landscape structure on proportion of alien plant species in forest sites. Ecoscience 11:278–281Google Scholar
  9. Cullen L, Schmink M, Padua CV, Morato MIR (2001) Agroforestry benefit zones: a tool for the conservation and management of Atlantic forest fragments, Sao Paulo, Brazil. Nat Areas J 21:346–356Google Scholar
  10. DMTI Spatial (2001) Canmap Streetfiles 5.1. [computer file]. DMTI Spatial, Markham, OntarioGoogle Scholar
  11. DeCandido R (2004) Recent changes in plant species diversity in urban Pelham Bay Park, 1947–1998. Biol Conserv 120:129–136CrossRefGoogle Scholar
  12. Environmental Systems Research Institute Inc (1999) Arc View GIS version 32. Environmental Systems Research Institute Inc., Redlands, CAGoogle Scholar
  13. Fensham RJ, Cowie ID (1998) Alien plant invasions on the Tiwi Islands. Extent, implications and priorities for control. Biol Conserv 83:55–68CrossRefGoogle Scholar
  14. Fernald ML (1970) Gray’s manual of botany – a handbook of the flowering plants and ferns of the Central and Northeastern United States and adjacent Canada, 8th edn. D Van Nostrand Company, New York, USAGoogle Scholar
  15. Gillett JM (ed) (1958) Checklist of plants of the Ottawa District. Canada Department of Agriculture, Ottawa, Ontario, CanadaGoogle Scholar
  16. Gleason HA, Cronquist A (1991) Manual of vascular plants of northeastern United States and adjacent Canada. The New York Botanical Garden, New York, USAGoogle Scholar
  17. Gray AN (2005) Eight nonnative plants in western Oregon forests: associations with environment and management. Environ Monitor Assess 100:109–127CrossRefGoogle Scholar
  18. Hager HA (2004) Differential effects of Typha litter and plants on invasive Lythrum salicaria seedling survival and growth. Biol Invas 6:433–444CrossRefGoogle Scholar
  19. Hodkinson DJ, Thompson K (1997) Plant dispersal: the role of man. J Appl Ecol 34:1484–1496CrossRefGoogle Scholar
  20. Houlahan JE, Findlay CS (2004) Effect of invasive plant species on temperate wetland plant diversity. Conserv Biol 18:1132–1138CrossRefGoogle Scholar
  21. Houlahan JE, Keddy PA, Makkay K, Findlay CS (2006) The effects of adjacent land-use on wetland plant species richness and community composition. Wetlands 26:79–96CrossRefGoogle Scholar
  22. Kim KD (2005) Invasive plants on disturbed Korean sand dunes. Estuar Coast Shelf Sci 62:353–364CrossRefGoogle Scholar
  23. Leishman MR, Thomson VP (2005) Experimental evidence for the effects of additional water, nutrients and physical disturbance on invasive plants in low fertility Hawkesbury Sandstone soils, Sydney, Australia. J Ecol 93:38–49CrossRefGoogle Scholar
  24. Marie-Victorin FEC (1995) Flore Laurentienne. 3 ième ed. Les Presses de l’Université de Montréal, MontréalGoogle Scholar
  25. McKinney ML (2004) Citizens as propagules for exotic plants: measurement and management implications. Weed Technol 18(Suppl. S):1480–1483Google Scholar
  26. Moffatt SF, McLachlan SM, Kenkel NC (2004) Impacts of land use on riparian forest along an urban-rural gradient in southern Manitoba. Plant Ecol 174:119–135CrossRefGoogle Scholar
  27. National Air Photo Library (1933–2001) Air photo series, Ottawa region, 1:15,000 to 1:50,000. Ottawa, Ontario, CanadaGoogle Scholar
  28. Niering WA, Olmstead NC (1979) The Audubon Society Field Guide to North American Wildflowers – Eastern Region. Alfred A Knopf, New YorkGoogle Scholar
  29. Ontario Ministry of Natural Resources (1988–1992) Ontario Base Maps, Ottawa Region, 1:10,000. Ontario Ministry of Natural Resources, Toronto, Ontario, CanadaGoogle Scholar
  30. Preston RJ (1989) North American trees, 4th edn. Iowa State University Press, Ames, Iowa, USAGoogle Scholar
  31. Rodgers JC, Parker KC (2003) Distribution of alien plant species in relation to human disturbance on the Georgia Sea Islands. Divers Distrib 9:385–398CrossRefGoogle Scholar
  32. Rousseau C (1968) Histoire, Habitat et distribution de 220 plantes introduites au Québec. Nat Can 95:49–169Google Scholar
  33. Rousseau C (1971) Une classification de la flore synanthropique du Québec et de l’Ontario II. Liste des espèces. Nat Can 98:697–730Google Scholar
  34. Rubino DL, Williams CE, Moriarity WJ (2002) Herbaceous layer contrast and alien plant occurrence in utility corridors and riparian forests of the Allegheny High Plateau. J Torrey Bot Soc 129:125–135CrossRefGoogle Scholar
  35. Sanz-Elorza M, Dana ED, Sobrino E (2006) Invasibility of an inland area in NE Spain by alien plants. Acta Oecol 29:114–122CrossRefGoogle Scholar
  36. SAS Institute (1990) SAS version 6. SAS Institute, Cary, NC, USAGoogle Scholar
  37. Service de la cartographie du Québec (1983–1984) Quebec topographic maps, Ottawa region, 1:20,000. Ministère de l’Énergie et des Ressources du Québec, Service de la cartographie, Sainte-Foy, Québec, CanadaGoogle Scholar
  38. Setterfield SA, Douglas MM, Hutley LB, Welch MA (2005) Effects of canopy cover and ground disturbance on establishment of an invasive grass in an Australia savanna. Biotropica 37:25–31Google Scholar
  39. Smith RM, Thompson K, Hodgson JG, Warren PH, Gaston KJ (2006) Urban domestic gardens (IX): composition and richness of the vascular plant flora, and implications for native biodiversity. Biol Conserv 129:312–322CrossRefGoogle Scholar
  40. Soper JH, Heimburger ML (1982) Shrubs of Ontario. The Royal Ontario Museum, Toronto, Ontario, CanadaGoogle Scholar
  41. Sullivan JJ, Timmins SM, Williams PA (2005) Movement of exotic plants into coastal native forests from gardens in northern New Zealand. N Z J Ecol 29:1–10Google Scholar
  42. Ter Braak CJF (1986) Canonical correspondence analysis: a new eigenvector technique for multivariate direct gradient analysis. Ecology 67:1167–1179CrossRefGoogle Scholar
  43. Weaver T, Gustafson D, Lichthardt J (2001) Exotic plants in early and late seral vegetation of fifteen northern Rocky Mountain environments (HTs). West N Am Nat 61:417–427Google Scholar
  44. Wu SH, Hsieh CF, Chaw SM, Rejmanek M (2004) Plant invasions in Taiwan: insights from the flora of casual and naturalized alien species. Divers Distrib 10:349–362CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Stéphanie Duguay
    • 1
  • Felix Eigenbrod
    • 1
  • Lenore Fahrig
    • 1
  1. 1.Geomatics and Landscape Ecology Research LaboratoryCarleton UniversityOttawaCanada

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