Brawn before brains in placental mammals after the end-Cretaceous extinction
Mammals are the most encephalized vertebrates, with the largest brains relative to body size. Placental mammals have particularly enlarged brains, with expanded neocortices for sensory integration, the origins of which are unclear. We used computed tomography scans of newly discovered Paleocene fossils to show that contrary to the convention that mammal brains have steadily enlarged over time, early placentals initially decreased their relative brain sizes because body mass increased at a faster rate. Later in the Eocene, multiple crown lineages independently acquired highly encephalized brains through marked growth in sensory regions. We argue that the placental radiation initially emphasized increases in body size as extinction survivors filled vacant niches. Brains eventually became larger as ecosystems saturated and competition intensified.
| Errataetall: |
CommentIn: Science. 2022 Apr;376(6588):59-61. - PMID 35357916 |
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| Medienart: |
E-Artikel |
| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:376 |
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| Enthalten in: |
Science (New York, N.Y.) - 376(2022), 6588 vom: 01. Apr., Seite 80-85 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Bertrand, Ornella C [VerfasserIn] |
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Date Completed 05.04.2022 Date Revised 02.05.2022 published: Print-Electronic CommentIn: Science. 2022 Apr;376(6588):59-61. - PMID 35357916 Citation Status MEDLINE |
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| doi: |
10.1126/science.abl5584 |
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NLM338879188 |
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| 520 | |a Mammals are the most encephalized vertebrates, with the largest brains relative to body size. Placental mammals have particularly enlarged brains, with expanded neocortices for sensory integration, the origins of which are unclear. We used computed tomography scans of newly discovered Paleocene fossils to show that contrary to the convention that mammal brains have steadily enlarged over time, early placentals initially decreased their relative brain sizes because body mass increased at a faster rate. Later in the Eocene, multiple crown lineages independently acquired highly encephalized brains through marked growth in sensory regions. We argue that the placental radiation initially emphasized increases in body size as extinction survivors filled vacant niches. Brains eventually became larger as ecosystems saturated and competition intensified | ||
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| 700 | 1 | |a Shelley, Sarah L |e verfasserin |4 aut | |
| 700 | 1 | |a Williamson, Thomas E |e verfasserin |4 aut | |
| 700 | 1 | |a Wible, John R |e verfasserin |4 aut | |
| 700 | 1 | |a Chester, Stephen G B |e verfasserin |4 aut | |
| 700 | 1 | |a Flynn, John J |e verfasserin |4 aut | |
| 700 | 1 | |a Holbrook, Luke T |e verfasserin |4 aut | |
| 700 | 1 | |a Lyson, Tyler R |e verfasserin |4 aut | |
| 700 | 1 | |a Meng, Jin |e verfasserin |4 aut | |
| 700 | 1 | |a Miller, Ian M |e verfasserin |4 aut | |
| 700 | 1 | |a Püschel, Hans P |e verfasserin |4 aut | |
| 700 | 1 | |a Smith, Thierry |e verfasserin |4 aut | |
| 700 | 1 | |a Spaulding, Michelle |e verfasserin |4 aut | |
| 700 | 1 | |a Tseng, Z Jack |e verfasserin |4 aut | |
| 700 | 1 | |a Brusatte, Stephen L |e verfasserin |4 aut | |
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