Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences

Abstract Ammonoids are extinct cephalopods with external shells which predominated in many late Paleozoic and Mesozoic marine ecosystems. Stable isotope data from ammonoid shells constitute primary tools for understanding their palaeohabitats. However, in most sedimentary successions globally the ar...

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Autores principales:	Marcin Machalski, Krzysztof Owocki, Zofia Dubicka, Oksana Malchyk, Weronika Wierny
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d2c64b631f2a47b4842d3c1549d673bc
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spelling	oai:doaj.org-article:d2c64b631f2a47b4842d3c1549d673bc2021-11-28T12:15:59ZStable isotopes and predation marks shed new light on ammonoid habitat depth preferences10.1038/s41598-021-02236-92045-2322https://doaj.org/article/d2c64b631f2a47b4842d3c1549d673bc2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02236-9https://doaj.org/toc/2045-2322Abstract Ammonoids are extinct cephalopods with external shells which predominated in many late Paleozoic and Mesozoic marine ecosystems. Stable isotope data from ammonoid shells constitute primary tools for understanding their palaeohabitats. However, in most sedimentary successions globally the aragonitic shells of ammonoids are dissolved during fossilisation process and therefore not available for geochemical studies. We overcome this taphonomic bias by analysing the better preservable calcitic elements of the ammonoid jaws (aptychi). We study moulds and aptychi of two successive members, temporal subspecies in our interpretation, of a scaphitid evolutionary lineage from a Late Cretaceous chalk succession in Poland. In order to reconstruct their habitat depth preferences, we apply the powerful combination of stable isotope data from aptychi and co-occurring benthic and planktic foraminifera with an analysis of predation marks preserved on scaphitid specimens. On this basis we conclude that the populations of the older subspecies led a nektic, and those of the younger subspecies, a nektobenthic lifestyle. The shift in habitat depth preferences took place probably as a response of local populations to the shallowing of the sea. Previous studies largely assumed stable depth preferences for ammonoid species, genera and even higher clades. Our study casts doubts over such generalizations by pointing out that ammonoids could have been more flexible in their depth-related behaviour than anticipated.Marcin MachalskiKrzysztof OwockiZofia DubickaOksana MalchykWeronika WiernyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marcin Machalski Krzysztof Owocki Zofia Dubicka Oksana Malchyk Weronika Wierny Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences
description	Abstract Ammonoids are extinct cephalopods with external shells which predominated in many late Paleozoic and Mesozoic marine ecosystems. Stable isotope data from ammonoid shells constitute primary tools for understanding their palaeohabitats. However, in most sedimentary successions globally the aragonitic shells of ammonoids are dissolved during fossilisation process and therefore not available for geochemical studies. We overcome this taphonomic bias by analysing the better preservable calcitic elements of the ammonoid jaws (aptychi). We study moulds and aptychi of two successive members, temporal subspecies in our interpretation, of a scaphitid evolutionary lineage from a Late Cretaceous chalk succession in Poland. In order to reconstruct their habitat depth preferences, we apply the powerful combination of stable isotope data from aptychi and co-occurring benthic and planktic foraminifera with an analysis of predation marks preserved on scaphitid specimens. On this basis we conclude that the populations of the older subspecies led a nektic, and those of the younger subspecies, a nektobenthic lifestyle. The shift in habitat depth preferences took place probably as a response of local populations to the shallowing of the sea. Previous studies largely assumed stable depth preferences for ammonoid species, genera and even higher clades. Our study casts doubts over such generalizations by pointing out that ammonoids could have been more flexible in their depth-related behaviour than anticipated.
format	article
author	Marcin Machalski Krzysztof Owocki Zofia Dubicka Oksana Malchyk Weronika Wierny
author_facet	Marcin Machalski Krzysztof Owocki Zofia Dubicka Oksana Malchyk Weronika Wierny
author_sort	Marcin Machalski
title	Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences
title_short	Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences
title_full	Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences
title_fullStr	Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences
title_full_unstemmed	Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences
title_sort	stable isotopes and predation marks shed new light on ammonoid habitat depth preferences
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d2c64b631f2a47b4842d3c1549d673bc
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Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences

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