首页|Large dinosaur egg accumulations and their significance for understanding nesting behaviour

Large dinosaur egg accumulations and their significance for understanding nesting behaviour

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The accurate identification of dinosaur egg accumulations as nests or clutches is crucial for understanding the reproductive behaviour of these extinct species.However,existing methods often rely on the pres-ence of complete eggs and embryo remains,and sedimentological criteria that are only applicable to well-structured sediments.In this study,we introduce an innovative approach to characterize egg accu-mulations in structureless sediments,where traditional nest structures may not be preserved.Our methodology employs a unique combination of sedimentological,taphonomic,geochemical,and geo-physical proxies for the study of egg accumulations.We applied this approach to the egg accumulation from Paimogo(Jurassic,Portugal),traditionally interpreted as a nest.Our findings reveal that the Paimogo egg assemblage is a secondary deposit,resulting from a flooding event in a fluvial plain that dis-mantled several allosauroid and crocodylomorph clutches.The eggshell vapor conductance results,cou-pled with sedimentological evidence,suggest that allosauroid dinosaurs buried their eggs in the dry terrain of overbank areas close to a main channel during the breeding season,likely during the dry season to prevent the embryos from drowning.This research underscores the necessity of multidisciplinary approaches in interpreting egg accumulations and offers a novel methodology for studying these accu-mulations in structureless sediments.Our findings provide new insights into the breeding behaviour and nesting preferences of these extinct organisms,contributing to our understanding of dinosaur ecology.

Breeding behaviourTheropodTaphonomyStable isotopesMagnetic susceptibilityJurassic

L.Ezquerro、R.Coimbra、B.Bauluz、C.Núñez-Lahuerta、T.Román-Berdiel、M.Moreno-Azanza

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Departamento de Geodinámica,Estratigrafia y Paleontología,Facultad de Ciencias Geológicas,Universidad Complutense de Madrid,C/José Antonio Novais,12,28040,Madrid,Spain

Aragosaurus～-IUCA:Recursos Geológicos y Paleoambientales.Departamento de Ciencias de la Tierra.Facultad de Ciencias,Universidad de Zaragoza.C/Pedro Cerbuna 12,50009 Zaragoza,Spain

Museu da Lourinha,Lourinha,Portugal

GeoBioTec,Department of Earth Sciences,NOVA School of Science and Technology,Universidade Nova de Lisboa,Caparica,Portugal

GeoBioTec,Departamento de Geociencias,Universidade de Aveiro,Aveiro,Portugal

Insitut Català de Paleoecologia Humana i Evolució Social(IPHES-CERCA),Zona Educacional 4,Campus Sescelades URV(Edifici W3),43007 Tarragona,Spain

Departament dHistòria i Hist

Geotransfer IUCA,Departamento de Ciencias de La Tierra,Facultad de Ciencias,Universidad de Zaragoza,Zaragoza,Spain

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PLEC2021-008203 projectMCIN/AEI/10.13039/501100011033European Union"NextGenerationEU"/PRTR"Funda??o para a Ciencia e Tecnologia(FCT-MCTES)of PortugalFunda??o para a Ciencia e Tecnologia(FCT-MCTES)of PortugalResearch Unit GeoBioTecCarmen Nunez-LahuertaMCINNextGeneration EU/PRTR

RYC2021-034473-IPTDC/CTA-PAL/31656/2017PTDC/CTA-PAL/2217/2021UIDB/04035/2020FJC2020-044561-I-

2024

10.1016/j.gsf.2024.101872

地学前缘(英文版)
中国地质大学（北京） 北京大学

地学前缘(英文版)

CSTPCD
影响因子：0.576
ISSN：1674-9871
年,卷(期)：2024.15(5)