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Evolutionary analysis of swimming speed in early vertebrates challenges the 'New Head Hypothesis'

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Evolutionary analysis of swimming speed in early vertebrates challenges the 'New Head Hypothesis'

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dc.contributor.author Ferrón, Humberto G.
dc.contributor.author Dnnoghue, P. C. J.
dc.date.accessioned 2023-03-02T07:43:35Z
dc.date.available 2023-03-02T07:43:35Z
dc.date.issued 2022
dc.identifier.citation FERRÓN, H. G. DONOGHUE, P. C. J. 2022 Evolutionary analysis of swimming speed in early vertebrates challenges the 'New Head Hypothesis' Communications Biology 5 1 1 8
dc.identifier.uri https://hdl.handle.net/10550/85585
dc.description.abstract The ecological context of early vertebrate evolution is envisaged as a long-term trend towards increasingly active food acquisition and enhanced locomotory capabilities culminating in the emergence of jawed vertebrates. However, support for this hypothesis has been anecdotal and drawn almost exclusively from the ecology of living taxa, despite knowledge of extinct phylogenetic intermediates that can inform our understanding of this formative episode. Here we analyse the evolution of swimming speed in early vertebrates based on caudal fin morphology using ancestral state reconstruction and evolutionary model fitting. We predict the lowest and highest ancestral swimming speeds in jawed vertebrates and microsquamous jawless vertebrates, respectively, and find complex patterns of swimming speed evolution with no support for a trend towards more active lifestyles in the lineage leading to jawed groups. Our results challenge the hypothesis of an escalation of Palaeozoic marine ecosystems and shed light into the factors that determined the disparate palaeobiogeographic patterns of microsquamous versus macrosquamous armoured Palaeozoic jawless vertebrates. Ultimately, our results offer a new enriched perspective on the ecological context that underpinned the assembly of vertebrate and gnathostome body plans, supporting a more complex scenario characterized by diverse evolutionary locomotory capabilities reflecting their equally diverse ecologies.
dc.language.iso eng
dc.relation.ispartof Communications Biology, 2022, vol. 5, num. 1, p. 1-8
dc.subject Evolució (Biologia)
dc.title Evolutionary analysis of swimming speed in early vertebrates challenges the 'New Head Hypothesis'
dc.type journal article es_ES
dc.date.updated 2023-03-02T07:43:35Z
dc.identifier.idgrec 156493
dc.rights.accessRights open access es_ES

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