A cat's tale: the impact of genetic restoration on Florida panther population dynamics and persistence
Article first published online: 17 DEC 2012
© 2012 The Authors. Journal of Animal Ecology © 2012 British Ecological Society
Journal of Animal Ecology
Volume 82, Issue 3, pages 608–620, May 2013
How to Cite
Hostetler, J. A., Onorato, D. P., Jansen, D. and Oli, M. K. (2013), A cat's tale: the impact of genetic restoration on Florida panther population dynamics and persistence. Journal of Animal Ecology, 82: 608–620. doi: 10.1111/1365-2656.12033
- Issue published online: 15 APR 2013
- Article first published online: 17 DEC 2012
- Manuscript Accepted: 6 NOV 2012
- Manuscript Received: 29 AUG 2012
- Florida Panther Research and Management Trust Fund
- National Park Service
- University of Florida. Grant Number: 401816G091
- United States Fish and Wildlife Service
- Florida panther;
- genetic introgression;
- genetic restoration;
- population viability analysis;
- probability of extinction;
- Puma concolor coryi;
- stochastic population growth rate;
- Genetic restoration has been suggested as a management tool for mitigating detrimental effects of inbreeding depression in small, inbred populations, but the demographic mechanisms underlying population-level responses to genetic restoration remain poorly understood.
- We studied the dynamics and persistence of the endangered Florida panther Puma concolor coryi population and evaluated the potential influence of genetic restoration on population growth and persistence parameters. As part of the genetic restoration programme, eight female Texas pumas P. c. stanleyana were released into Florida panther habitat in southern Florida in 1995.
- The overall asymptotic population growth rate (λ) was 1·04 (5th and 95th percentiles: 0·95–1·14), suggesting an increase in the panther population of approximately 4% per year. Considering the effects of environmental and demographic stochasticities and density-dependence, the probability that the population will fall below 10 panthers within 100 years was 0·072 (0–0·606).
- Our results suggest that the population would have declined at 5% per year (λ = 0·95; 0·83–1·08) in the absence of genetic restoration. Retrospective life table response experiment analysis revealed that the positive effect of genetic restoration on survival of kittens was primarily responsible for the substantial growth of the panther population that would otherwise have been declining.
- For comparative purposes, we also estimated probability of quasi-extinction under two scenarios – implementation of genetic restoration and no genetic restoration initiative – using the estimated abundance of panthers in 1995, the year genetic restoration was initiated. Assuming no density-dependence, the probability that the panther population would fall below 10 panthers by 2010 was 0·098 (0·002–0·332) for the restoration scenario and 0·445 (0·032–0·944) for the no restoration scenario, providing further evidence that the panther population would have faced a substantially higher risk of extinction if the genetic restoration initiative had not been implemented.
- Our results, along with those reporting increases in population size and improvements in biomedical correlates of inbreeding depression, provide strong evidence that genetic restoration substantially contributed to the observed increases in the Florida panther population.