Future Evolutionary Flexibility and Biodiversity Biodiversity.
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Transcript of Future Evolutionary Flexibility and Biodiversity Biodiversity.
Future Evolutionary Flexibility and Biodiversity
BiodiversityLoss of Biodiversity
Mass Extinctions
Cretaceous~65 mya
Triassic~208 mya
Permian~245 mya
Devonian~360 mya
Ordovician~438 mya
Humanian?~TODAY!
Future Evolutionary Flexibility and Biodiversity
The PaperDisrupting evolutionary processes: The effect of habitat fragmentation on collared lizards in the Missouri OzarksAlan R. Templeton, Robert J. Robertson, Jennifer Brisson, and Jared Strasburg
Future Evolutionary Flexibility and Biodiversity
The PaperDisrupting evolutionary processes: The effect of habitat fragmentation on collared lizards in the Missouri OzarksAlan R. Templeton, Robert J. Robertson, Jennifer Brisson, and Jared Strasburg
Future Evolutionary Flexibility and Biodiversity
The PaperDisrupting evolutionary processes: The effect of habitat fragmentation on collared lizards in the Missouri OzarksAlan R. Templeton, Robert J. Robertson, Jennifer Brisson, and Jared Strasburg
Future Evolutionary Flexibility and Biodiversity
The PaperDisrupting evolutionary processes: The effect of habitat fragmentation on collared lizards in the Missouri OzarksAlan R. Templeton, Robert J. Robertson, Jennifer Brisson, and Jared Strasburg
Future Evolutionary Flexibility and Biodiversity
The PaperObservations:
• FST = 0.40 for present population
• Few individuals in each population
• Populations only ~50 meters apart
Possible Conclusion:
• No / Reduced Gene Flow
• Loss of genetic variability within individual subpopulations
Future Evolutionary Flexibility and Biodiversity
The PaperHow to Test:
• Translocate and observe behavior of collared lizards in new environment.
• Stegall Mountain Natural Area
• Ecologically destroyed
Future Evolutionary Flexibility and Biodiversity
The PaperHow to Test:
Time periodRecaptured in glade other
than glade of original captureRecaptured in glade of
original capture
1984-1993 0 9
63 Lizzards Marked on SM-7, SM-8, SM-9
Future Evolutionary Flexibility and Biodiversity
The PaperObservations:
• FST = 0.40 for present population
• Few individuals in each population
• Populations only ~50 meters apart
Possible Conclusion:
• No / Reduced Gene Flow
• Loss of genetic variability within individual subpopulations
Future Evolutionary Flexibility and Biodiversity
The Paper
Glade A Glade BSavanna
A clear corridor from one population to the next
Gene Flow OccursLow FST
Glade A Glade B
No corridor from one population to the next
Gene Flow InhibitedHigh FST = .40
Oak-Hickory Forest
Crowded Understory
Future Evolutionary Flexibility and Biodiversity
The PaperHow to Test:
Time periodRecaptured in glade other
than glade of original captureRecaptured in glade of
original capture
1984-1993 0 9
63 Lizzards Marked on SM-7, SM-8, SM-9
1994-1994 9 9
Two-tailed Fisher’s Exact Test: P = 0.012.
Future Evolutionary Flexibility and Biodiversity
The PaperHow to Test:
AreaRecaptured in glade other
than glade of original captureRecaptured in glade of
original capture
Unburned 0 34
39 Lizzards Marked Outside Burned Area65 Lizzards Marked in Burn Area
Burned 9 9
Two-tailed Fisher’s Exact Test: P < 0.01.
Future Evolutionary Flexibility and Biodiversity
The Paper
Glade A Glade B
No corridor from one population to the next
Gene Flow InhibitedHigh FST = .40
Oak-Hickory Forest
Crowded Understory
Future Evolutionary Flexibility and Biodiversity
The Paper
Glade A Glade BSavanna
A clear corridor from one population to the next
Gene Flow OccursLow FST
10x Original Population Size
Better quality glades
Some smaller glades used for sustenance
Future Evolutionary Flexibility and Biodiversity
The ImplicationsHumans can cause severe ecological damage
Fragmentation of a habitat
Reduction in genetic variability
Speciation
Need a favorable environment that provides
plenty of ecological opportunities.
Extinction
Adaptive abilities precluded
Future Evolutionary Flexibility and Biodiversity
The ImplicationsExtinction
Adaptive abilities precluded
Why?
Little variability puts populations at risk of pathogens and environmental changes
Adaptations cannot spread though populations
Future Evolutionary Flexibility and Biodiversity
The ImplicationsExtinction
Adaptive abilities precluded
1950’s Viable Population1990’s Extinct Population
Victoria Glade
Year
Future Evolutionary Flexibility and Biodiversity
The ImplicationsExtinction
Adaptive abilities precluded
Extinction Ratchet