Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

The Influence of Disturbance Events on Survival and Dispersal Rates of Florida Box Turtles

C. Kenneth Dodd Jr., Arpat Ozgul and Madan K. Oli
Ecological Applications
Vol. 16, No. 5 (Oct., 2006), pp. 1936-1944
Published by: Wiley
Stable URL: http://www.jstor.org/stable/40061763
Page Count: 9
  • Download ($42.00)
  • Subscribe ($19.50)
  • Cite this Item
The Influence of Disturbance Events on Survival and Dispersal Rates of Florida Box Turtles
Preview not available

Abstract

Disturbances have the potential to cause long-term effects to ecosystem structure and function, and they may affect individual species in different ways. Long-lived vertebrates such as turtles may be at risk from such events, inasmuch as their life histories preclude rapid recovery should extensive mortality occur. We applied capture-mark-recapture models to assess disturbance effects on a population of Florida box turtles (Terrapene Carolina bauri) on Egmont Key, Florida, USA. Near the midpoint of the study, a series of physical disturbances affected the island, from salt water overwash associated with several tropical storms to extensive removal of nonindigenous vegetation. These disturbances allowed us to examine demographic responses of the turtle population and to determine if they affected dispersal throughout the island. Adult survival rates did not vary significantly either between sexes or among years of the study. Survival rates did not vary significantly between juvenile and adult turtles, or among years of the study. Furthermore, neither adult nor juvenile survival rates differed significantly between pre- and post-disturbance. However, dispersal rates varied significantly among the four major study sites, and dispersal rates were higher during the pre-disturbance sampling periods compared to post-disturbance. Our results suggest few long-term effects on the demography of the turtle population. Florida box turtles responded to tropical storms and vegetation control by moving to favorable habitats minimally affected by the disturbances and remaining there. As long as turtles and perhaps other long-lived vertebrates can disperse to non-disturbed habitat, and high levels of mortality do not occur in a population, a long life span may allow them to wait out the impact of disturbance with potentially little effect on long-term population processes.

Page Thumbnails

  • Thumbnail: Page 
1936
    1936
  • Thumbnail: Page 
1937
    1937
  • Thumbnail: Page 
1938
    1938
  • Thumbnail: Page 
1939
    1939
  • Thumbnail: Page 
1940
    1940
  • Thumbnail: Page 
1941
    1941
  • Thumbnail: Page 
1942
    1942
  • Thumbnail: Page 
1943
    1943
  • Thumbnail: Page 
1944
    1944