Michael Busam Florida Panthersscience.umd.edu/biology/dudashlab/Population...Population size...
Transcript of Michael Busam Florida Panthersscience.umd.edu/biology/dudashlab/Population...Population size...
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Florida Panthers Michael Busam
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Goals of Presentation
• Describe Species
• Life History
• Threats
• Conservation
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General Species Description
• Puma concolor coryi
• Generalist carnivore
• Endangered
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Habitat
• Southwest Florida
• Preferred:
– Upland hardwood forest
– Hardwood swamp
– Pinelands
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Kautz et al. 2006
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Life History and How it’s Not Helping
• K-selected
• Lifespan: 8-15 years
• Age of first reproduction: 2.5 yrs
• Litter size: 2.6 (1-4) kittens
• Interbirth interval: 1.3 yrs
• High kitten mortality in first 3 mos.
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Life History (cont.)
• Breeding probability is 0.232 for any 6 mos.
– Higher in dry season (beginning of year)
• Age-breeding relationships
– Younger females have larger litters
– Older females senesce (~10 y.o.)
• Don’t breed with dependent kittens
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Life History (cont.)
• Home Range: 156-416 km2
• Dispersal: 20-68 km
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Population size Viability <50 Extinction highly probable in less than 100 years – demographic instability – Ne≪50 – high levels of inbreeding 60–70 Barely viable – low probability of extinction in 100 years – expect 25% population decline in 100 years – Ne < 50 – declining heterozygosity – no habitat loss or catastrophes can be tolerated 80–100 Stable population likely for 100 years – low probability of extinction in 100 years – expect population to remain stable over 100 years – Ne > 50 – slowly declining heterozygosity – no habitat loss or catastrophes can be tolerated >240 High probability of persistence – low probability of extinction in 100 years – expect population to remain stable over 100 years – Ne > 50 – able to retain 90% of heterozygosity – some habitat loss or mild catastrophes can be tolerated
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Inbreeding/Loss of Genetic Variation
• By early 1990’s, only ~25 panthers remaining
– Imminent extinction probable
• Significant adverse effects
– Atrial septal defects
– Tail kinks
– Cryptochordism
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Introgression
• Introduced 8 female pumas from Texas
– 5 bred, 15 F1
– 12 of F1 bred
– Overall, population grew at about 14% over next decade, to 95 adults
• Heterozygosity increased
– F1 survival was greater
– Less mortality from intraspecific aggression
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Johnson et al. 2010
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Habitat Loss
• Currently 10,000 km2 of habitat
• Conversion of habitat into urban and agricultural land
– Huge human expansion in S Florida
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Kautz et al. 2006
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Conclusions
• Florida Panthers are an endangered, k-selected apex predator restricted to limited portions of SW Florida
• They have responded well to genetic rescue and conservation efforts
• Habitat loss is the greatest current threat, and land acquisition programs are being used to protect it
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Photo Credits:
• Slide 1: http://refugeassociation.org/wp-content/uploads/2012/05/florida- panther-fws2.jpg
• Slide 2: http://www.flheritage.com/images/facts/symbols/panther.jpg
• Slide 10: http://www.propanther.org/id36.html
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Sources
• Hostetler, J. A., Onorato, D. P., Bolker, B. M., Johnson, W. E., O’Brien, S. J., Jansen, D., & Oli, M. K. (2012). Does genetic introgression improve female reproductive performance? A test on the endangered Florida panther. Oecologia, 168, 289-300. http://dx.doi.org/10.1007/s00442-011-2083-0
• Johnson, W. E., Onorato, D. P., Roelke, M. E., Land, E. D., Cunningham, M., Belden, R. C., . . .O'Brien, S. J. (2010). Genetic restoration of the Florida panther. Science, 329, 1641-1645. http://dx.doi.org/10.1126/science.1192891
• Kautz, R., Kawula, R., Hoctor, T., Comiskey, J., Jansen, D., Jennings, D., . . . Root, K. (2006). How much is enough? Landscape-scale conservation for the Florida panther. Biological Conservation, 130, 118-133. http://dx.doi.org/10.1016/j.biocon.2005.12.007
• Naccarato, A. (2008, February). Florida panther facts. Retrieved April 30, 2013, from http://www.floridapanther.org/panther_facts.html