The influence of juvenile dinosaurs on community structure and diversity
Despite dominating biodiversity in the Mesozoic, dinosaurs were not speciose. Oviparity constrained even gigantic dinosaurs to less than 15 kg at birth; growth through multiple morphologies led to the consumption of different resources at each stage. Such disparity between neonates and adults could...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2021-02, Vol.371 (6532), p.941-944 |
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| creator | Schroeder, Katlin Lyons, S Kathleen Smith, Felisa A |
| description | Despite dominating biodiversity in the Mesozoic, dinosaurs were not speciose. Oviparity constrained even gigantic dinosaurs to less than 15 kg at birth; growth through multiple morphologies led to the consumption of different resources at each stage. Such disparity between neonates and adults could have influenced the structure and diversity of dinosaur communities. Here, we quantified this effect for 43 communities across 136 million years and seven continents. We found that megatheropods (more than 1000 kg) such as tyrannosaurs had specific effects on dinosaur community structure. Although herbivores spanned the body size range, communities with megatheropods lacked carnivores weighing 100 to 1000 kg. We demonstrate that juvenile megatheropods likely filled the mesocarnivore niche, resulting in reduced overall taxonomic diversity. The consistency of this pattern suggests that ontogenetic niche shift was an important factor in generating dinosaur community structure and diversity. |
| doi_str_mv | 10.1126/science.abd9220 |
| format | Article |
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Oviparity constrained even gigantic dinosaurs to less than 15 kg at birth; growth through multiple morphologies led to the consumption of different resources at each stage. Such disparity between neonates and adults could have influenced the structure and diversity of dinosaur communities. Here, we quantified this effect for 43 communities across 136 million years and seven continents. We found that megatheropods (more than 1000 kg) such as tyrannosaurs had specific effects on dinosaur community structure. Although herbivores spanned the body size range, communities with megatheropods lacked carnivores weighing 100 to 1000 kg. We demonstrate that juvenile megatheropods likely filled the mesocarnivore niche, resulting in reduced overall taxonomic diversity. 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| subjects | Adults Animals Biodiversity Biological Variation, Population Body Size Body Weight Carnivora Carnivores Carnivory Community Relations Community structure Dinosaurs Dinosaurs - anatomy & histology Dinosaurs - growth & development Fossils Herbivores Herbivory Juveniles Mesozoic Morphology Neonates Niches Ontogeny Oviparity Prey Savannahs Species diversity |
| title | The influence of juvenile dinosaurs on community structure and diversity |
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