Reconstructing locomotor ecology of extinct avialans : a case study of Ichthyornis comparing sternum morphology and skeletal proportions
Avian skeletal morphology is associated with locomotor function, including flight style, swimming and terrestrial locomotion, and permits informed inferences on locomotion in extinct taxa. The fossil taxon Ichthyornis (Avialae: Ornithurae) has long been regarded as highly aerial, with flight similar to terns or gulls (Laridae), and skeletal features resembling foot-propelled diving adaptations. However, rigorous testing of locomotor hypotheses has yet to be performed on Ichthyornis, despite its notable phylogenetic position as one of the most crownward stem birds. We analysed separate datasets of three-dimensional sternal shape (geometric morphometrics) and skeletal proportions (linear measurements across the skeleton), to examine how well these data types predict locomotor traits in Neornithes. We then used this information to infer locomotor capabilities of Ichthyornis. We find strong support for both soaring and foot-propelled swimming capabilities in Ichthyornis. Further, sternal shape and skeletal proportions provide complementary information on avian locomotion: skeletal proportions allow better predictions of the capacity for flight, whereas sternal shape predicts variation in more specific locomotor abilities such as soaring, foot-propelled swimming and escape burst flight. These results have important implications for future studies of extinct avialan ecology and underscore the importance of closely considering sternum morphology in investigations of fossil bird locomotion.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:290 |
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| Enthalten in: |
Proceedings. Biological sciences - 290(2023), 1994 vom: 08. März, Seite 20222020 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Lowi-Merri, Talia M [VerfasserIn] |
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| Links: |
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| Themen: |
Ecomorphology |
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| Anmerkungen: |
Date Completed 09.03.2023 Date Revised 09.03.2024 published: Print-Electronic figshare: 10.6084/m9.figshare.c.6431721 Citation Status MEDLINE |
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| doi: |
10.1098/rspb.2022.2020 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM353890413 |
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| 245 | 1 | 0 | |a Reconstructing locomotor ecology of extinct avialans |b a case study of Ichthyornis comparing sternum morphology and skeletal proportions |
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| 500 | |a Date Revised 09.03.2024 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a figshare: 10.6084/m9.figshare.c.6431721 | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Avian skeletal morphology is associated with locomotor function, including flight style, swimming and terrestrial locomotion, and permits informed inferences on locomotion in extinct taxa. The fossil taxon Ichthyornis (Avialae: Ornithurae) has long been regarded as highly aerial, with flight similar to terns or gulls (Laridae), and skeletal features resembling foot-propelled diving adaptations. However, rigorous testing of locomotor hypotheses has yet to be performed on Ichthyornis, despite its notable phylogenetic position as one of the most crownward stem birds. We analysed separate datasets of three-dimensional sternal shape (geometric morphometrics) and skeletal proportions (linear measurements across the skeleton), to examine how well these data types predict locomotor traits in Neornithes. We then used this information to infer locomotor capabilities of Ichthyornis. We find strong support for both soaring and foot-propelled swimming capabilities in Ichthyornis. Further, sternal shape and skeletal proportions provide complementary information on avian locomotion: skeletal proportions allow better predictions of the capacity for flight, whereas sternal shape predicts variation in more specific locomotor abilities such as soaring, foot-propelled swimming and escape burst flight. These results have important implications for future studies of extinct avialan ecology and underscore the importance of closely considering sternum morphology in investigations of fossil bird locomotion | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a Ichthyornis | |
| 650 | 4 | |a ecomorphology | |
| 650 | 4 | |a functional morphology | |
| 650 | 4 | |a geometric morphometrics | |
| 650 | 4 | |a palaeoecology | |
| 700 | 1 | |a Demuth, Oliver E |e verfasserin |4 aut | |
| 700 | 1 | |a Benito, Juan |e verfasserin |4 aut | |
| 700 | 1 | |a Field, Daniel J |e verfasserin |4 aut | |
| 700 | 1 | |a Benson, Roger B J |e verfasserin |4 aut | |
| 700 | 1 | |a Claramunt, Santiago |e verfasserin |4 aut | |
| 700 | 1 | |a Evans, David C |e verfasserin |4 aut | |
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