Post-Cretaceous bursts of evolution along the benthic-pelagic axis in marine fishes

Ribeiro, Emanuell, Davis, Aaron M., Rivero-Vega, Rafael A., Ortí, Guillermo, and Betancur-R, Ricardo (2018) Post-Cretaceous bursts of evolution along the benthic-pelagic axis in marine fishes. Proceedings of the Royal Society of London Series B, Biological Sciences, 285 (1893). 20182010.

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Ecological opportunity arising in the aftermath of mass extinction events is thought to be a powerful driver of evolutionary radiations. Here, we assessed how the wake of the Cretaceous–Palaeogene (K-Pg) mass extinction shaped diversification dynamics in a clade of mostly marine fishes (Carangaria), which comprises a disparate array of benthic and pelagic dwellers including some of the most astonishing fish forms (e.g. flatfishes, billfishes, remoras, archerfishes). Analyses of lineage diversification show time-heterogeneous rates of lineage diversification in carangarians, with highest rates reached during the Palaeocene. Likewise, a remarkable proportion of Carangaria's morphological variation originated early in the history of the group and in tandem with a marked incidence of habitat shifts. Taken together, these results suggest that all major lineages and body plans in Carangaria originated in an early burst shortly after the K-Pg mass extinction, which ultimately allowed the occupation of newly released niches along the benthic-pelagic habitat axis.

Item ID: 57083
Item Type: Article (Research - C1)
ISSN: 1471-2954
Keywords: mass extinctions, ecological opportunity, macroevolution, benthic-pelagic axis, diversification
Copyright Information: © 2018 The Author(s). Published by the Royal Society. All rights reserved.
Funders: U.S. National Science Foundation (NSF)
Projects and Grants: NSF Award DEB-1457184, NSF Award DEB-1541491, NSF Award DEB-1457426
Date Deposited: 13 Feb 2019 07:30
FoR Codes: 31 BIOLOGICAL SCIENCES > 3104 Evolutionary biology > 310412 Speciation and extinction @ 50%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 50%
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