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Regional endothermy as a trigger for gigantism in some extinct macropredatory sharks

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Regional endothermy as a trigger for gigantism in some extinct macropredatory sharks

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dc.contributor.author Ferrón, Humberto G.
dc.date.accessioned 2023-03-01T16:42:06Z
dc.date.available 2023-03-01T16:42:06Z
dc.date.issued 2017
dc.identifier.citation FERRÓN, H. G. 2017 Regional endothermy as a trigger for gigantism in some extinct macropredatory sharks Plos One 12 9 e0185185
dc.identifier.uri https://hdl.handle.net/10550/85564
dc.description.abstract Otodontids include some of the largest macropredatory sharks that ever lived, the most extreme case being Otodus (Megaselachus) megalodon. The reasons underlying their gigantism, distribution patterns and extinction have been classically linked with climatic factors and the evolution, radiation and migrations of cetaceans during the Paleogene. However, most of these previous proposals are based on the idea of otodontids as ectothermic sharks regardless of the ecological, energetic and body size constraints that this implies. Interestingly, a few recent studies have suggested the possible existence of endothermy in these sharks thus opening the door to a series of new interpretations. Accordingly, this work proposes that regional endothermy was present in otodontids and some closely related taxa (cretoxyrhinids), playing an important role in the evolution of gigantism and in allowing an active mode of live. The existence of regional endothermy in these groups is supported here by three different approaches including isotopic-based approximations, swimming speed inferences and the application of a novel methodology for assessing energetic budget and cost of swimming in extinct taxa. In addition, this finding has wider implications. It calls into question some previous paleotemperature estimates based partially on these taxa, suggests that the existing hypothesis about the evolution of regional endothermy in fishes requires modification, and provides key evidence for understanding the evolution of gigantism in active macropredators.
dc.language.iso eng
dc.relation.ispartof Plos One, 2017, vol. 12, num. 9, p. e0185185
dc.subject Paleontologia
dc.title Regional endothermy as a trigger for gigantism in some extinct macropredatory sharks
dc.type journal article es_ES
dc.date.updated 2023-03-01T16:42:07Z
dc.identifier.doi 10.1371/journal.pone.0185185
dc.identifier.idgrec 124004
dc.rights.accessRights open access es_ES

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