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Phylogeny and the dispersal of Homo
David S. Strait, U Albany
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Biogeographyg g p y
The study of how and why y yorganisms are distributed across
the landscape
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Darwin’s voyage to the y gGalapagos Islands
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Darwin’s fi hfinches
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Phylogeny implies biogeographyPhylogeny implies biogeography
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Strait and Grine (2004)
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UncertainCentral AfricaEast AfricaSouth AfricaSouth Africa
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6 7 Myr6 - 7 Myr
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6 7 Myr6 - 7 Myr
> 3 Myr
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6 7 Myr6 - 7 Myr
> 3 Myr
1 8 Myr~ 1.8 Myr
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6 7 Myr6 - 7 Myr
> 3 Myr
1 8 Myr~ 1.8 Myr
~ 1.8 Myr
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6 7 Myr6 - 7 Myr
> 3 Myr
1 8 Myr~ 1.8 Myr
~ 1.8 Myr
3 - 3.5 Myry
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Out of Africa 1:The old viewThe old view
1.9 Myr
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Out of Africa 1:The old viewThe old view
1.9 Myr
1.6 - 1.3 Myry
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Out of Africa 1:The old viewThe old view
1.9 Myr
1.6 - 1.3 Myry
1.0 Myr
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Out of Africa 1:The old viewThe old view
1.9 Myr
1.6 - 1.3 Myry
1.0 Myr
500 Kyry
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Out of Africa 1:The new(er) viewThe new(er) view
1.9 Myr
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Out of Africa 1:The new(er) viewThe new(er) view
1.9 Myr
1.8 Myr
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Out of Africa 1:The new(er) viewThe new(er) view
1.9 Myr
1.8 Myr
At least 1.2 Myry
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ER 1813 D 2700
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ObjectivesObjectives• Use cladistic analysis to test the predictionsUse cladistic analysis to test the predictions
of “Out-of-Africa 1”:• The first hominin to leave Africa was a descendant of earlyThe first hominin to leave Africa was a descendant of early
African Homo erectus (i.e., H. ergaster).• All European and Asian H. erectus populations are
descended from that original dispersing population (i edescended from that original dispersing population (i.e., there were not multiple dispersals out of Africa).
• African H. erectus is descended from African ancestors (I.e., there were not dispersals of Asian hominins back into Africa).
Evaluate the phylogenetic and biogeographic• Evaluate the phylogenetic and biogeographic hypotheses emerging from recent analyses of the Dmanisi and Liang Bua homininsthe Dmanisi and Liang Bua hominins.
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Methods: Taxa• Outgroup:
Australopithecus africanusAustralopithecus africanus
• Ingroup:H h biliHomo habilis
Homo rudolfensisH. ergaster includes only the early fossils
Homo ergaster
Homo georgicusfrom the Turkana Basin(e.g., ER 992, ER 3733, ER 3883, WT 15000)
Homo erectus
Homo floresisensis
3883, WT 15000)
Homo heidelbergensis
Homo neanderthalensis
Homo sapiens
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Methods: Taxa• Outgroup:
Australopithecus africanusAustralopithecus africanus
• Ingroup:H h biliHomo habilis
Homo rudolfensisH erectus includes earlyHomo ergaster
Homo georgicus
H. erectus includes early and late Asian fossils, similar African fossils, and
Homo erectus
Homo floresisensis
similar African fossils, and fossils now attributed to H. antecessor
Homo heidelbergensis
Homo neanderthalensis
(e.g., Sangiran, Zhoukoutian, Ngangdong, Sambungmachan, Trinil, OH 9, Ternifine, ER 42700, Gran D li Si d l El h tHomo sapiens Dolina, Sima del Elephante, Ceprano)
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Methods: Taxa• Outgroup:
Australopithecus africanusAustralopithecus africanus
• Ingroup:H h biliHomo habilis
Homo rudolfensis
Homo ergaster
Homo georgicusH. heidelbergensis includes Asian, African and E h i hHomo erectus
Homo floresisensis
European archaic humans, including specimens preserving an incompleteHomo heidelbergensis
Homo neanderthalensis
preserving an incomplete set of Neanderthal features(e.g., Dali, Zuttiyeh, Kabwe, Bodo,
Homo sapiens Florisbad, Petralona, Arago, Steinheim, Mauer, Sima de los Huesos, Swanscombe)
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Methods: Taxa• Outgroup:
Australopithecus africanusAustralopithecus africanus
• Ingroup:H h biliHomo habilis
Homo rudolfensis
Homo ergaster
Homo georgicus
Homo erectus
Homo floresisensis
Homo heidelbergensis
Homo neanderthalensisH. sapiens includes only early African specimens
Homo sapiens (e.g., Omo Kibish, Herto, Jebel Irhoud, Border Cave, Klasies River Mouth, Ngaloba, Dar Es Soltane)
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Methods: characters• Examined 81 (mostly cranial)
characters but not all of themcharacters, but not all of them were cladistically useful.
• Many characters were either too variable, or autapomorphic.
• Examined 51 “traditional” characterscharacters.
• Of those, 28 were cladistically useful.
• Examined 30 “craniometric” characters derived from the H ll d t tHowells data set.
• Of those, 7 were cladistically usefuluseful.
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Tree length = 70Two equally parsimonious trees
Tree length 70Consistency index = 0.69Retention index = 0.68
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AfricaEuropeEuropeEurasia
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AfricaEuropeEuropeEurasia
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AfricaEuropeEuropeEurasia
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AfricaEuropeEuropeEurasia
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2.3 Myr
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2.3 Myr
2.3 - 1.9 Myr
? ? ? ? ?? ? ? ? ?
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2.3 Myr
2.3 - 1.9 Myr
????
? ? ? ? ?? ? ? ? ?
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2.3 Myr
2.3 - 1.9 Myr
????
? ? ? ? ?1.9 Myr
? ? ? ? ?
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2.3 Myr
2.3 - 1.9 Myr
????
? ? ? ? ?1.9 Myr
1.9 Myr
? ? ? ? ?
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2.3 Myr
2.3 - 1.9 Myr
????
? ? ? ? ?1.9 Myr
1.9 Myr
? ? ? ? ?
1.8 Myr1.5 Myr
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2.3 Myr
2.3 - 1.9 Myr
????
? ? ? ? ?1.9 Myr
1.9 Myr
? ? ? ? ?
1.8 Myr1.5 Myr
At least 1.2 Myr
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2.3 Myr
2.3 - 1.9 Myr
????
? ? ? ? ?1.9 Myr
1.9 Myr
? ? ? ? ?
1.8 Myr1.5 Myr
At least 1.2 Myr
400 - 600 Kyr
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Conclusion• Cladistic analysis supported cladograms in which H.
floresisensis and H georgicus diverge prior to thefloresisensis and H. georgicus diverge prior to the appearance of H. ergaster.
• Biogeographic patterns implied by this phylogeny are inconsistent with Out-of-Africa 1.
• The first hominins to leave Africa may be broadly classified as belonging to H habilis sensu latoclassified as belonging to H. habilis sensu lato.
• Several species of Homo evolve first in Asia and subsequently disperse into Africa and Europe.q y p p
• Neanderthals may have evolved in Europe, and modern humans may have evolved in Africa, but the
h i t f th li lik l t harchaic ancestors of these lineages are likely to have evolved first in Asia.
• Fieldwork efforts directed towards expanding the• Fieldwork efforts directed towards expanding the fossil record of Homo in Eurasia are needed.
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Dedicated to the memory of Charlie LockwoodLockwood
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Adaptive landscapesp p
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Shifting balanceg