Future Evolutionary Flexibility and Biodiversity Biodiversity.

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Future Evolutionary Flexibility and Biodiversity Biodiversity

Transcript of Future Evolutionary Flexibility and Biodiversity Biodiversity.

Future Evolutionary Flexibility and Biodiversity

Biodiversity

Future Evolutionary Flexibility and Biodiversity

Biodiversity

Global Changes:

Changing Climate

Future Evolutionary Flexibility and Biodiversity

Biodiversity

Global Changes:

Changing Climate

Future Evolutionary Flexibility and Biodiversity

Biodiversity

Global Changes:

Changing Climate

Future Evolutionary Flexibility and Biodiversity

Biodiversity

Global Changes:

Changing Climate

Future Evolutionary Flexibility and Biodiversity

BiodiversityLoss of 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

Biodiversity

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 Paper

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 Paper

Future Evolutionary Flexibility and Biodiversity

The Paper

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 Paper

Future Evolutionary Flexibility and Biodiversity

The Paper

Before BurnAfter Burn

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

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

Future Evolutionary Flexibility and Biodiversity

The ImplicationsThere is still hope…

Future biodiversity can be saved!

Processes that allow evolution and adaptations to occur must

be maintained.