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Static Dental Disparity and Morphological Turnover in Sharks across the End-Cretaceous Mass Extinction
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.ORCID-id: 0000-0002-9495-0781
Uppsala universitet, Enheten för musik och museer, Evolutionsmuseet.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
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2018 (engelsk)Inngår i: Current Biology, ISSN 0960-9822, E-ISSN 1879-0445, Vol. 28, nr 16, s. 2607-2615Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The Cretaceous-Palaeogene (K-Pg) mass extinction profoundly altered vertebrate ecosystems and prompted the radiation of many extant clades [1, 2]. Sharks (Selachimorpha) were one of the few larger-bodied marine predators that survived the K-Pg event and are represented by an almost-continuous dental fossil record. However, the precise dynamics of their transition through this interval remain uncertain [3]. Here, we apply 2D geometric morphometrics to reconstruct global and regional dental morphospace variation among Lamniformes (Mackerel sharks) and Carch-arhiniformes (Ground sharks). These clades are prevalent predators in today's oceans, and were geographically widespread during the late Cretaceous-early Palaeogene. Our results reveal a decoupling of morphological disparity and taxonomic richness. Indeed, shark disparity was nearly static across the K-Pg extinction, in contrast to abrupt declines among other higher-trophic-level marine predators [4, 5]. Nevertheless, specific patterns indicate that an asymmetric extinction occurred among lamniforms possessing lowcrowned/triangular teeth and that a subsequent proliferation of carcharhiniforms with similar tooth morphologies took place during the early Paleocene. This compositional shift in post-Mesozoic shark lineages hints at a profound and persistent K-Pg signature evident in the heterogeneity of modern shark communities. Moreover, such wholesale lineage turnover coincided with the loss of many cephalopod [6] and pelagic amniote [5] groups, as well as the explosive radiation of middle trophic-level teleost fishes [1]. We hypothesize that a combination of prey availability and post-extinction trophic cascades favored extant shark antecedents and laid the foundation for their extensive diversification later in the Cenozoic [7-10].

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CELL PRESS , 2018. Vol. 28, nr 16, s. 2607-2615
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Identifikatorer
URN: urn:nbn:se:uu:diva-363937DOI: 10.1016/j.cub.2018.05.093ISI: 000442111300030PubMedID: 30078565OAI: oai:DiVA.org:uu-363937DiVA, id: diva2:1258066
Forskningsfinansiär
Knut and Alice Wallenberg FoundationThe Royal Swedish Academy of Sciences, GS2017-0018Tilgjengelig fra: 2018-10-23 Laget: 2018-10-23 Sist oppdatert: 2018-10-23bibliografisk kontrollert

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Kear, Benjamin P.Blom, HenningAhlberg, PerCampione, Nicolas E.

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