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- W2913649413 abstract "Through elasmobranch (sharks and rays) evolutionary history, gigantism evolved multiple times in phylogenetically distant species, some of which are now extinct. Interestingly, the world's largest elasmobranchs display two specializations found never to overlap: filter feeding and mesothermy. The contrasting lifestyles of elasmobranch giants provide an ideal case study to elucidate the evolutionary pathways leading to gigantism in the oceans. Here, we applied a phylogenetic approach to a global dataset of 459 taxa to study the evolution of elasmobranch gigantism. We found that filter feeders and mesotherms deviate from general relationships between trophic level and body size, and exhibit significantly larger sizes than ectothermic‐macropredators. We confirm that filter feeding arose multiple times during the Paleogene, and suggest the possibility of a single origin of mesothermy in the Cretaceous. Together, our results elucidate two main evolutionary pathways that enable gigantism: mesothermic and filter feeding. These pathways were followed by ancestrally large clades and facilitated extreme sizes through specializations for enhancing prey intake. Although a negligible percentage of ectothermic‐macropredators reach gigantic sizes, these species lack such specializations and are correspondingly constrained to the lower limits of gigantism. Importantly, the very adaptive strategies that enabled the evolution of the largest sharks can also confer high extinction susceptibility." @default.
- W2913649413 created "2019-02-21" @default.
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- W2913649413 creator A5054491654 @default.
- W2913649413 creator A5070433559 @default.
- W2913649413 date "2019-01-24" @default.
- W2913649413 modified "2023-10-18" @default.
- W2913649413 title "Evolutionary pathways toward gigantism in sharks and rays" @default.
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- W2913649413 doi "https://doi.org/10.1111/evo.13680" @default.
- W2913649413 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30675721" @default.
- W2913649413 hasPublicationYear "2019" @default.
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