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Chamber volume development, metabolic rates, and selective extinction in cephalopods

Reconstructing the physiology of extinct organisms is key to understanding mechanisms of selective extinction during biotic crises. Soft tissues of extinct organisms are rarely preserved and, therefore, a proxy for physiological aspects is needed. Here, we examine whether cephalopod conchs yield inf...

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Main Authors: Tajika, Amane (Author) , Landman, Neil H. (Author) , Hoffmann, René (Author) , Lemanis, Robert (Author) , Morimoto, Naoki (Author) , Ifrim, Christina (Author) , Klug, Christian (Author)
Format: Article (Journal)
Language:English
Published: 19 February 2020
In: Scientific reports
Year: 2020, Volume: 10
ISSN:2045-2322
DOI:10.1038/s41598-020-59748-z
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1038/s41598-020-59748-z
Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/s41598-020-59748-z
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Author Notes:Amane Tajika, Neil H. Landman, René Hoffmann, Robert Lemanis, Naoki Morimoto, Christina Ifrim & Christian Klug
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Summary:Reconstructing the physiology of extinct organisms is key to understanding mechanisms of selective extinction during biotic crises. Soft tissues of extinct organisms are rarely preserved and, therefore, a proxy for physiological aspects is needed. Here, we examine whether cephalopod conchs yield information about their physiology by assessing how the formation of chambers respond to external stimuli such as environmental changes. We measured chamber volume through ontogeny to detect differences in the pattern of chamber volume development in nautilids, coleoids, and ammonoids. Results reveal that the differences between ontogenetic trajectories of these cephalopods involve the presence or absence of abrupt decreases of chamber volume. Accepting the link between metabolic rate and growth, we assume that this difference is rooted in metabolic rates that differ between cephalopod clades. High metabolic rates combined with small hatching size in ammonoids as opposed to lower metabolic rates and much larger hatchlings in most nautilids may explain the selective extinction of ammonoids as a consequence of low food availability at the end of the Cretaceous.
Item Description:Gesehen am 18.09.2020
Physical Description:Online Resource
ISSN:2045-2322
DOI:10.1038/s41598-020-59748-z

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