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How does Evolutionary
Distinctiveness change when we
place fossils in the tree?
Graeme T. Lloyd
@GraemeTLloyd
EDGE species
Evolutionary
Distinctiveness
Extinction Risk
Isaac et al. 2007
EDGE species
Evolutionary
Distinctiveness
Extinction Risk
EDGE
Isaac et al. 2007
Evolutionary Distinctiveness
Isaac et al. 2007
012345
Time (Ma)
Evolutionary Distinctiveness
Isaac et al. 2007
012345
Time (Ma)
3
5
1
1
1
1
1
1Branch Duration
Evolutionary Distinctiveness
Isaac et al. 2007
012345
Time (Ma)
4
1
2
2
1
1
1
1N Descendants
Evolutionary Distinctiveness
Isaac et al. 2007
012345
Time (Ma)
3 / 4
5 / 1
1 / 2
1 / 2
1 / 1
1 / 1
1 / 1
1 / 1Branch Duration /
N Descendants
Evolutionary Distinctiveness
Isaac et al. 2007
012345
Time (Ma)
0.75
5
0.5
0.5
1
1
1
1ED
Evolutionary Distinctiveness
Isaac et al. 2007
012345
Time (Ma)
0.75 +
5 =
0.5 +
0.5 +
1 =
1 =
1 =
1 =
2.25
2.25
2.25
2.25
5
ED
Evolutionary Distinctiveness
012345
Time (Ma)
0.75 +
5 =
0.5 +
0.5 +
1 =
1 =
1 =
1 =
2.25
2.25
2.25
2.25
5
ED
Isaac et al. 2007
?
Case study
Tree without fossils
Oaks 2011
ED without fossils
ED without fossils
Alligator sinensis
Tree with fossils
Change in EDDecreaseinED
IncreaseinED
ED with fossils
ED with fossils
Gavialis gangeticus
Tomistoma schlegelii

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How does Evolutionary Distinctiveness change when we place fossils in the tree?