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dc.contributor.authorPimiento, Catalinaen
dc.contributor.authorCantalapiedra, Juan Len
dc.contributor.authorShimada, Kenshuen
dc.contributor.authorField, Daniel Jareden
dc.contributor.authorSmaers, Jeroen Ben
dc.date.accessioned2019-02-12T00:30:35Z
dc.date.available2019-02-12T00:30:35Z
dc.date.issued2019-03en
dc.identifier.issn0014-3820
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/289161
dc.description.abstractThrough elasmobranch (sharks, skates and rays) evolutionary history, gigantism evolved multiple times in phylogenetically distant species, some of which are now extinct. Interestingly, the world’s largest sharks 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 other elasmobranchs. 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 three evolutionary pathways that enable gigantism: mesothermy, filter-feeding and ectothermic-macropredation. The mesothermic and filter-feeding pathways were followed by ancestrally large clades and facilitated extreme sizes through specializations for enhancing prey intake. Species following the ectothermic-macropredatory pathway did not acquire these specializations, and are correspondingly constrained to the lower limits of gigantism. Importantly, the very adaptive strategies that enabled the evolution of the largest sharks are highly vulnerable to extinction.
dc.format.mediumPrint-Electronicen
dc.languageengen
dc.subjectAnimalsen
dc.subjectElasmobranchiien
dc.subjectSharksen
dc.subjectBody Sizeen
dc.subjectDieten
dc.subjectBiological Evolutionen
dc.titleEvolutionary pathways toward gigantism in sharks and rays.en
dc.typeArticle
prism.endingPage599
prism.issueIdentifier3en
prism.publicationDate2019en
prism.publicationNameEvolution; international journal of organic evolutionen
prism.startingPage588
prism.volume73en
dc.identifier.doi10.17863/CAM.36423
dcterms.dateAccepted2019-01-04en
rioxxterms.versionofrecord10.1111/evo.13680en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-03en
dc.contributor.orcidPimiento, Catalina [0000-0002-5320-7246]
dc.contributor.orcidCantalapiedra, Juan L [0000-0003-0913-7735]
dc.contributor.orcidField, Daniel [0000-0002-1786-0352]
dc.identifier.eissn1558-5646
rioxxterms.typeJournal Article/Reviewen
rioxxterms.freetoread.startdate2020-01-24


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