Urban Ecosystems

, Volume 2, Issue 4, pp 279–297 | Cite as

Patterns of human disturbance and response by small mammals and birds in chaparral near urban development

  • Raymond M. Sauvajot
  • Marybeth Buechner
  • Denise A. Kamradt
  • Christine M. Schonewald


We report on the extent of disturbance (including habitat alteration and road and trail proliferation) in chaparral near urban development and analyze the effects of disturbance on small mammal and resident bird species. Disturbance patterns were evaluated in a 6700 ha study area in southern California: effects on mammals and birds were investigated by analyzing relationships between vegetation structure and animal species richness and abundance. Disturbance was prevalent throughout the study area and included extensive human-altered habitat (from past human activities such as vegetation clearing, human-caused fires, refuse dumping, and vegetation trampling) and 157 km of roads and trails. A nonsignificant trend was found between human-altered habitat and proximity to development, but human-altered habitat was significantly associated with roadway proximity. Trails were also more frequent near urban development and roads. Small mammals responded strongly to disturbance-related vegetation changes, while birds showed little or no response. Mammals endemic to chaparral vegetation were less diverse and abundant in disturbed sites, whereas disturbance-associated species increased in abundance. Close proximity of urban development to natural areas resulted in alteration of natural habitat and proliferation of roads and trails. Variation in life history traits between birds and mammals may affect response to disturbance and influence persistence if disturbance continues. Conservation efforts must recognize the potential for habitat damage and associated declines in native animal species caused by disturbance near urbanization and implement strategies to reduce these threats.

urban edge habitat disturbance small mammals birds chaparral 


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  1. American Ornithologists' Union (AOU) (1998) Check-list of North American birds. 7th ed. Allen Press, Lawrence, KS.Google Scholar
  2. Blair, R. B. (1996) Land use and avian species diversity along an urban gradient. Ecol. Appl. 6, 506-519.Google Scholar
  3. Bolger, D. T., Alberts, A. C., Sauvajot, R. M., Potenza, P., McCalvin, C., Tran, D., Mazzoni, S. and Soulé, M. E. (1997a) Response of rodents to habitat fragmentation in coastal southern California. Ecol. Appl. 7, 552-563.Google Scholar
  4. Bolger, D. T., Scott, T. A. and Rotenberry, J. T. (1997b) Breeding bird abundance in an urbanizing landscape in coastal southern California. Conserv. Biol. 11, 406-421.Google Scholar
  5. Boyle, S. A. and Samson, F. B. (1985) Effects of non-consumptive recreation on wildlife: a review. Wildl. Soc. Bull. 13, 110-116.Google Scholar
  6. Brittingham, M. C. and Temple, S. A. (1983) Have cowbirds caused forest songbirds to decline? BioScience 33, 31-35.Google Scholar
  7. Buechner, M. (1987) Conservation in insular parks: simulation models of factors affecting the movement of animals across park boundaries. Biol. Conserv. 41, 57-76.Google Scholar
  8. Buechner, M. and Sauvajot, R. M. (1996) Conservation and zones of human activity: the spread of human disturbance across a protected landscape. In Biodiversity in Managed Landscapes: Theory and Practice (R. C. Szaro and D. W. Johnston, eds), pp. 605-629. Oxford University Press, New York.Google Scholar
  9. Chen, J., Franklin, J. F. and Spies, T. A. (1993) Contrasting microclimates among clearcut, edge, and interior of old-growth Douglas-fir forest. Agricultural and Forest Meteorology 63, 219-237.Google Scholar
  10. Cody M.L. (1981) Habitat selection in birds: the roles of vegetation structure, competitors and productivity. BioScience 31, 107-111.Google Scholar
  11. Davis, D. D., ed. (1982) CRC Handbook of Census Methods for Terrestrial Vertebrates. CRC Press, Boca Raton, FL.Google Scholar
  12. Dawson, K. J. (1996) Interior and exterior land use as factors in landscape biodiverisity from case studies. In Biodiversity in Managed Landscapes: Theory and Practice (R. C. Szaro and D. W. Johnston, eds), pp. 514-530. Oxford University Press, New York.Google Scholar
  13. Dickman, C. R. and Doncaster, C. P. (1987) The ecology of small mammals in urban habitats. I. Populations in a patchy environment. J. Anim. Ecol. 56, 629-640.Google Scholar
  14. Dickman, C. R. and Doncaster, C. P. (1989) The ecology of small mammals in urban habitats. II. Demography and dispersal. J. Anim. Ecol. 58, 119-127.Google Scholar
  15. Doak, D. F. (1995) Source-sink models and the problem of habitat degradation: general models and applications to the Yellowstone grizzly. Conserv. Biol. 9, 1370-1379.Google Scholar
  16. Dobson, A. P., Rodriguez, J. P., Roberts, W. M. and Wilcove, D. S. (1997) Geographic distribution of endangered species in the United States. Science 275, 550-553.Google Scholar
  17. Ehrlich, P. R., Dobkin, D. S. and Wheye, D. (1988) The Birder's Handbook. Simon and Schuster, New York.Google Scholar
  18. Emlen, J. T. (1971) Population densities of birds derived from transect counts. Auk 88, 323-342.Google Scholar
  19. Environmental Systems Research Institute, Inc. (1995) Arc/Info. Revision 7.0.3. Redlands, CA.Google Scholar
  20. Friesen, L. E., Eagles, P. F. J. and MacKay, R. J. (1995) Effects of residential development on forest-dwelling neotropical migrant songbirds. Conserv. Biol. 9, 408-1414.Google Scholar
  21. Garrett, K. and Dunn, J. (1981) Birds of Southern California: Status and Distribution. Los Angeles Audubon Society, Los Angeles, CA.Google Scholar
  22. Gates, J. E. and Gysel, L. W. (1978). Avian nest dispersion and fledging success in field-forest ecotones. Ecology 59, 871-883.Google Scholar
  23. Hannah, L., Lohse, D., Hatchinson, C., Carr, J. L. and Lankerani, A. (1994) A preliminary inventory of human disturbance of world ecosystems. Ambio 23, 246-250.Google Scholar
  24. Hannah, L., Carr, J. L. and Lankerani, A. (1995) Human disturbance and natural habitat: a biome level analysis of a global data set. Biodiv. Conserv. 4, 128-155.Google Scholar
  25. Harris, L. D. (1988) Edge effects and conservation of biotic diversity. Conserv. Biol. 2, 330-332.Google Scholar
  26. Heady, H. F., Gibbens, R. P. and Powell, R. W. (1959) A comparison of the charting, line intercept, and line point methods of sampling shrub types of vegetation. J. Range Manage. 12, 180-188.Google Scholar
  27. Holm, S. (1979) A simple sequentially rejective multiple test procedure. Scand. J. Stat. 6, 65-70.Google Scholar
  28. Howe, R. W., Davis, G. J. and Mosca, V. (1991) The demographic significance of “sink” populations. Biol. Conserv. 57, 239-255.Google Scholar
  29. Hutto, R. L. (1989) The effect of habitat alteration on migratory land birds in a west Mexican tropical deciduous forest: a conservation perspective. Conserv. Biol. 3, 138-148.Google Scholar
  30. Jameson, E. W., Jr. and Peeters, H. J. (1988) California Mammals. University of California Press, Berkeley, CA.Google Scholar
  31. Janzen, D. H. (1986) The eternal external threat. In Conservation Biology: The Science of Scarcity and Diversity (M. E. Soulé, ed.), pp. 286-303. Sinauer Associates, Sunderland, MA.Google Scholar
  32. Jim, C. Y. (1989) Visitor management in recreation areas. Environ. Conserv. 16, 19-32, 40.Google Scholar
  33. Jullien, M. and Thiollay, J. (1996) Effects of rain forest disturbance and fragmentation: comparative changes of the raptor community along natural and human-made gradients in French Guiana. J. Biogeog. 23, 7-25.Google Scholar
  34. Keeley, J. E., ed. (1993) Interface Between Ecology and Land Development in California. Southern California Academy of Sciences, Los Angeles, CA.Google Scholar
  35. Lovejoy, T. E., Bierregaard, R. O., Jr., Rylands, A. B., Malcolm, J. R., Quintela, C. E., Harper, L. H., Brown, K. S., Jr., Powell, A. H., Powell, G. V. N., Schubart, H. O. R. and Hays, M. B. (1986) Edge and other effects of isolation on Amazon forest fragments. In Conservation Biology: The Science of Scarcity and Diversity (M. E. Soulé, ed.), pp. 257-285. Sinauer Associates, Sunderland, MA.Google Scholar
  36. Lubchenco, J., Olson, A. M., Brubaker, L. B., Carpenter, S. R., Holland, M. M., Hubbell, S. P., Levin, S. A., MacMahon, J. A., Matson, P. A., Melillo, J. M., Mooney, H. A., Peterson, C. H., Pulliam, H. R., Real, L. A., Regal, P. J. and Risser, P. G. (1991) The sustainable biosphere research initiative: an ecological research agenda. Ecology 72, 371-412.Google Scholar
  37. MacArthur, R. H. and MacArthur, J. W. (1961) On bird species diversity. Ecology 42, 594-598.Google Scholar
  38. MacDonald, I. A. W., Graber, D. M., DeBenedetti, S., Groves, R. H. and Fuentes, E. R. (1988) Introduced species in nature reserves in Mediterranean-type climatic regions of the world. Biol. Conserv. 44, 37-66.Google Scholar
  39. Matson, P. (1990) The use of urban gradients in ecological studies. Ecology 71, 1231.Google Scholar
  40. Miller, R. G., Jr. (1966) Simultaneous Statistical Inference. McGraw-Hill, New York.Google Scholar
  41. Mills, L. S. 1995. Edge effects and isolation: red-backed voles on forest remnants. Conserv. Biol. 9, 395-403.Google Scholar
  42. Murcia, C. (1995) Edge effects in fragmented forests: implications for conservation. Trends Ecol. Evol. 10, 58-62.Google Scholar
  43. Murphy, D. D. (1988) Challenges to biological diversity in urban areas. In Biodiversity (E. O. Wilson, ed.), pp. 71-76. National Academy Press, Washington, DC.Google Scholar
  44. Noss, R. F. (1987) Protecting natural areas in fragmented landscapes. Nat. Areas J. 7, 2-13.Google Scholar
  45. Paton, P. W. (1994) The effect of edge on avian nest success: how strong is the evidence? Conserv. Biol. 8, 17-26.Google Scholar
  46. Pulliam, H. R. (1988) Sources, sinks, and population regulation. Am. Nat. 132, 652-661.Google Scholar
  47. Quinn, R. D. (1990) Habitat Preferences and Distribution of Mammals in California Chaparral. USDAForest Service, Pacific Southwest Research Station, Berkeley, CA.Google Scholar
  48. Rice, W. R. (1989) Analyzing tables of statistical tests.Evolution 43, 223-225.Google Scholar
  49. Riffell, S. K., Gutzwiller, K. J. and Anderson, S. H. (1996) Does repeated human intrusion cause cumulative declines in avian richness and abundance? Ecol. Appl. 6, 492-505.Google Scholar
  50. Saunders, D. A., Hobbs, R. J. and Margules, C. R. (1991) Biological consequences of ecosystem fragmentation: a review. Conserv. Biol. 5, 18-32.Google Scholar
  51. Sauvajot, R. M. (1995) Conservation science in fire-prone natural areas. In Brushfires in California: Ecology and Resource Management (J. E. Keeley and T. Scott, eds), pp. 11-19. International Association of Wildland Fire, Fairfield, WA.Google Scholar
  52. Sauvajot, R. M. (1997) Edge effects, urban encroachment, and anthropogenic disturbance in southern California chaparral mammal and bird communities. Ph.D. diss., University of California, Davis, CA.Google Scholar
  53. Sauvajot, R. M. and Buechner, M. (1993) Effects of urban encroachment on wildlife in the Santa Monica Mountains. In Interface Between Ecology and Land Development in California (J. E. Keeley, ed.), pp. 171-180. Southern California Academy of Sciences, Los Angeles, CA.Google Scholar
  54. Schonewald-Cox, C. M. (1988) Boundaries in the protection of nature reserves. BioScience 38, 480-486.Google Scholar
  55. Schonewald-Cox, C. M. and Bayless, J. W. (1986) The boundary model: a geographical analysis of design and conservation of nature reserves. Biol. Conserv. 38, 305-322.Google Scholar
  56. Schonewald-Cox, C. M. and Buechner, M. (1992) Park protection and public roads. In Conservation Biology: TheTheory and Practice of Nature Conservation, Preservation and Management (P. L. Fiedler and S. Jain, eds), pp. 373-396. Chapman and Hall, New York.Google Scholar
  57. Scott, T. (1995) California's fragmented shrublands-overview and goals. In Brushfires in California: Ecology and Resource Management (J. E. Keeley and T. Scott, eds), pp. 3-10. International Association of Wildland Fire, Fairfield, WA.Google Scholar
  58. Sieving, K. E. (1992) Nest predation and differential insular extinction among selected forest birds of central Panama. Ecology 73, 2310-2328.Google Scholar
  59. Soulé, M. E., Bolger, D. T., Alberts, A. C., Sauvajot, R. M., Wright, J., Sorice, M. and Hill, S. (1988) Reconstructed dynamics of rapid extinctions of chaparral-requiring birds in urban habitat islands. Conserv. Biol. 2, 75-92.Google Scholar
  60. Soulé, M. E., Alberts, A. C. and Bolger, D. T. (1992) The effects of habitat fragmentation on chaparral plants and vertebrates. Oikos 63, 39-47.Google Scholar
  61. Stephenson, P. J. (1993) The small mammal fauna of Réserve Spéciale d'Analamazaotra, Madagascar: the effects of human disturbance on endemic species diversity. Biodiv. Conserv. 2, 603-615.Google Scholar
  62. Wilcove, D. S. (1985) Nest predation in forest tracts and the decline of migratory songbirds. Ecology 66, 1211-1214.Google Scholar
  63. Zar, J. H. (1984) Biostatistical Analysis. Prentice-Hall, Englewood Cliffs, NJ.Google Scholar

Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Raymond M. Sauvajot
    • 2
  • Marybeth Buechner
    • 3
  • Denise A. Kamradt
    • 1
  • Christine M. Schonewald
    • 4
  1. 1.US National Park Service, Santa Monica Mountains National Recreation AreaThousand OaksUSA; and
  2. 2.Division of Environmental StudiesUniversity of CaliforniaDavisUSA;.
  3. 3.Department of BiologyCosumnes River CollegeSacramentoUSA
  4. 4.USGS, Biological Resources Division, California Science Center, Division of Environmental StudiesUniversity of CaliforniaDavisUSA

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