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dc.contributor.authorPimiento, Catalina
dc.contributor.authorCantalapiedra, Juan L
dc.contributor.authorShimada, Kenshu
dc.contributor.authorField, Daniel J
dc.contributor.authorSmaers, Jeroen B
dc.date.accessioned2019-02-12T00:30:35Z
dc.date.available2019-02-12T00:30:35Z
dc.date.issued2019-03
dc.identifier.issn0014-3820
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/289161
dc.description.abstractThrough 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.
dc.format.mediumPrint-Electronic
dc.languageeng
dc.publisherWiley
dc.subjectBody size
dc.subjectelasmobranchs
dc.subjectevolution
dc.subjectfilter feeding
dc.subjectgigantism
dc.subjectmesothermy
dc.subjectAnimals
dc.subjectBiological Evolution
dc.subjectBody Size
dc.subjectDiet
dc.subjectElasmobranchii
dc.subjectSharks
dc.titleEvolutionary pathways toward gigantism in sharks and rays.
dc.typeArticle
prism.endingPage599
prism.issueIdentifier3
prism.publicationDate2019
prism.publicationNameEvolution
prism.startingPage588
prism.volume73
dc.identifier.doi10.17863/CAM.36423
dcterms.dateAccepted2019-01-04
rioxxterms.versionofrecord10.1111/evo.13680
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2019-03
dc.contributor.orcidPimiento, Catalina [0000-0002-5320-7246]
dc.contributor.orcidCantalapiedra, Juan L [0000-0003-0913-7735]
dc.contributor.orcidField, Daniel J [0000-0002-1786-0352]
dc.identifier.eissn1558-5646
dc.publisher.urlhttp://doi.org/10.1111/evo.13680
rioxxterms.typeJournal Article/Review
cam.issuedOnline2019-01-24
rioxxterms.freetoread.startdate2020-01-24


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