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Static Dental Disparity and Morphological Turnover in Sharks across the End-Cretaceous Mass Extinction.
Curr Biol. 2018 08 20; 28(16):2607-2615.e3.CB

Abstract

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 Carcharhiniformes (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 low-crowned/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].

Authors+Show Affiliations

Subdepartment of Evolution and Development, Department of Organismal Biology, Uppsala University, Norbyvägen 18A, SE-752 36 Uppsala, Sweden; Palaeobiology Programme, Department of Earth Science, Uppsala University, Villavägen 16, SE-752 36 Uppsala, Sweden. Electronic address: mohamad.bazzi@ebc.uu.se.Museum of Evolution, Uppsala University, Norbyvägen 16, SE-752 36 Uppsala, Sweden.Subdepartment of Evolution and Development, Department of Organismal Biology, Uppsala University, Norbyvägen 18A, SE-752 36 Uppsala, Sweden.Subdepartment of Evolution and Development, Department of Organismal Biology, Uppsala University, Norbyvägen 18A, SE-752 36 Uppsala, Sweden.Subdepartment of Evolution and Development, Department of Organismal Biology, Uppsala University, Norbyvägen 18A, SE-752 36 Uppsala, Sweden; Palaeobiology Programme, Department of Earth Science, Uppsala University, Villavägen 16, SE-752 36 Uppsala, Sweden; Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale 2351, New South Wales, Australia. Electronic address: ncampion@une.edu.au.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

30078565

Citation

Bazzi, Mohamad, et al. "Static Dental Disparity and Morphological Turnover in Sharks Across the End-Cretaceous Mass Extinction." Current Biology : CB, vol. 28, no. 16, 2018, pp. 2607-2615.e3.
Bazzi M, Kear BP, Blom H, et al. Static Dental Disparity and Morphological Turnover in Sharks across the End-Cretaceous Mass Extinction. Curr Biol. 2018;28(16):2607-2615.e3.
Bazzi, M., Kear, B. P., Blom, H., Ahlberg, P. E., & Campione, N. E. (2018). Static Dental Disparity and Morphological Turnover in Sharks across the End-Cretaceous Mass Extinction. Current Biology : CB, 28(16), 2607-e3. https://doi.org/10.1016/j.cub.2018.05.093
Bazzi M, et al. Static Dental Disparity and Morphological Turnover in Sharks Across the End-Cretaceous Mass Extinction. Curr Biol. 2018 08 20;28(16):2607-2615.e3. PubMed PMID: 30078565.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Static Dental Disparity and Morphological Turnover in Sharks across the End-Cretaceous Mass Extinction. AU - Bazzi,Mohamad, AU - Kear,Benjamin P, AU - Blom,Henning, AU - Ahlberg,Per E, AU - Campione,Nicolás E, Y1 - 2018/08/02/ PY - 2018/02/12/received PY - 2018/04/05/revised PY - 2018/05/31/accepted PY - 2018/8/7/pubmed PY - 2019/10/19/medline PY - 2018/8/7/entrez KW - Carcharhiniformes KW - Disparity KW - Geometric Morphometrics KW - K–Pg Boundary KW - Lamniformes KW - Macroevolution KW - Mass extinction KW - Sharks KW - Teeth SP - 2607 EP - 2615.e3 JF - Current biology : CB JO - Curr Biol VL - 28 IS - 16 N2 - 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 Carcharhiniformes (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 low-crowned/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]. SN - 1879-0445 UR - https://www.unboundmedicine.com/medline/citation/30078565/Static_Dental_Disparity_and_Morphological_Turnover_in_Sharks_across_the_End_Cretaceous_Mass_Extinction_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0960-9822(18)30763-2 DB - PRIME DP - Unbound Medicine ER -