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Two pulses of morphological diversification in Pacific pelagic fishes following the Cretaceous-Palaeogene mass extinction.
Proc Biol Sci. 2018 10 10; 285(1888)PB

Abstract

Molecular phylogenies suggest some major radiations of open-ocean fish clades occurred roughly coincident with the Cretaceous-Palaeogene (K/Pg) boundary, however the timing and nature of this diversification is poorly constrained. Here, we investigate evolutionary patterns in ray-finned fishes across the K/Pg mass extinction 66 million years ago (Ma), using microfossils (isolated teeth) preserved in a South Pacific sediment core spanning 72-43 Ma. Our record does not show significant turnover of fish tooth morphotypes at the K/Pg boundary: only two of 48 Cretaceous tooth morphotypes disappear at the event in the South Pacific, a rate no different from background extinction. Capture-mark-recapture analysis finds two pulses of origination in fish tooth morphotypes following the mass extinction. The first pulse, at approximately 64 Ma, included short-lived teeth, as well as forms that contribute to an expansion into novel morphospace. A second pulse, centred at approximately 58 Ma, produced morphotype novelty in a different region of morphospace from the first pulse, and contributed significantly to Eocene tooth morphospace occupation. There was no significant increase in origination rates or expansion into novel morphospace during the early or middle Eocene, despite a near 10-fold increase in tooth abundance during that interval. Our results suggest that while the K/Pg event had a minor impact on fish diversity in terms of extinction, the removal of the few dominant Cretaceous morphotypes triggered a sequence of origination events allowing fishes to rapidly diversify morphologically, setting the stage for exceptional levels of ray-finned fish diversity in the Cenozoic.

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Authors+Show Affiliations

Sibert E
Society of Fellows, Harvard University, Cambridge, MA 02138, USA esibert@fas.harvard.edu. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92037, USA.
Friedman M
Museum of Paleontology, Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA. Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK.
Hull P
Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA.
Hunt G
Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA.
Norris R
Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92037, USA.

MeSH

AnimalsBiodiversityBiological EvolutionExtinction, BiologicalFishesFossilsPacific OceanTooth

Pub Type(s)

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

Language

eng

PubMed ID

30305432

Citation

Sibert, Elizabeth, et al. "Two Pulses of Morphological Diversification in Pacific Pelagic Fishes Following the Cretaceous-Palaeogene Mass Extinction." Proceedings. Biological Sciences, vol. 285, no. 1888, 2018.
Sibert E, Friedman M, Hull P, et al. Two pulses of morphological diversification in Pacific pelagic fishes following the Cretaceous-Palaeogene mass extinction. Proc Biol Sci. 2018;285(1888).
Sibert, E., Friedman, M., Hull, P., Hunt, G., & Norris, R. (2018). Two pulses of morphological diversification in Pacific pelagic fishes following the Cretaceous-Palaeogene mass extinction. Proceedings. Biological Sciences, 285(1888). https://doi.org/10.1098/rspb.2018.1194
Sibert E, et al. Two Pulses of Morphological Diversification in Pacific Pelagic Fishes Following the Cretaceous-Palaeogene Mass Extinction. Proc Biol Sci. 2018 10 10;285(1888) PubMed PMID: 30305432.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Two pulses of morphological diversification in Pacific pelagic fishes following the Cretaceous-Palaeogene mass extinction. AU - Sibert,Elizabeth, AU - Friedman,Matt, AU - Hull,Pincelli, AU - Hunt,Gene, AU - Norris,Richard, Y1 - 2018/10/10/ PY - 2018/05/30/received PY - 2018/09/18/accepted PY - 2018/10/12/entrez PY - 2018/10/12/pubmed PY - 2019/8/15/medline KW - Cretaceous–Palaeogene mass extinction KW - capture–recapture KW - fish evolution KW - fish teeth KW - ichthyoliths KW - morphometrics JF - Proceedings. Biological sciences JO - Proc Biol Sci VL - 285 IS - 1888 N2 - Molecular phylogenies suggest some major radiations of open-ocean fish clades occurred roughly coincident with the Cretaceous-Palaeogene (K/Pg) boundary, however the timing and nature of this diversification is poorly constrained. Here, we investigate evolutionary patterns in ray-finned fishes across the K/Pg mass extinction 66 million years ago (Ma), using microfossils (isolated teeth) preserved in a South Pacific sediment core spanning 72-43 Ma. Our record does not show significant turnover of fish tooth morphotypes at the K/Pg boundary: only two of 48 Cretaceous tooth morphotypes disappear at the event in the South Pacific, a rate no different from background extinction. Capture-mark-recapture analysis finds two pulses of origination in fish tooth morphotypes following the mass extinction. The first pulse, at approximately 64 Ma, included short-lived teeth, as well as forms that contribute to an expansion into novel morphospace. A second pulse, centred at approximately 58 Ma, produced morphotype novelty in a different region of morphospace from the first pulse, and contributed significantly to Eocene tooth morphospace occupation. There was no significant increase in origination rates or expansion into novel morphospace during the early or middle Eocene, despite a near 10-fold increase in tooth abundance during that interval. Our results suggest that while the K/Pg event had a minor impact on fish diversity in terms of extinction, the removal of the few dominant Cretaceous morphotypes triggered a sequence of origination events allowing fishes to rapidly diversify morphologically, setting the stage for exceptional levels of ray-finned fish diversity in the Cenozoic. SN - 1471-2954 UR - https://www.unboundmedicine.com/medline/citation/30305432/Two_pulses_of_morphological_diversification_in_Pacific_pelagic_fishes_following_the_Cretaceous_Palaeogene_mass_extinction_ DB - PRIME DP - Unbound Medicine ER -