The ecology of <em>Dickinsonia</em> on tidal flats

Estudios Geologicos. 2019;75(2):e116-e116 DOI 10.3989/egeol.43587.571

 

Journal Homepage

Journal Title: Estudios Geologicos

ISSN: 0367-0449 (Print); 1988-3250 (Online)

Publisher: Consejo Superior de Investigaciones Científicas

LCC Subject Category: Science: Geology

Country of publisher: Spain

Language of fulltext: English, French, Spanish

Full-text formats available: PDF, HTML, XML

 

AUTHORS


N. G. Sozonov (Novosibirsk State University - Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences)

N. I. Bobkov (Novosibirsk State University - Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences)

E. G. Mitchell (Department of Zoology, University of Cambridge)

A. V. Kolesnikov (Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences - Geological Institute, Russian Academy of Sciences - Moscow State Pedagogical University)

D. V. Grazhdankin (Novosibirsk State University - Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences)

EDITORIAL INFORMATION

Double blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 48 weeks

 

Abstract | Full Text

Specimens of Dickinsonia from the Central Urals are characterised by clear bilateral symmetry. Taking into account observations from Australian specimens, we consider that the so called ‘glide reflection symmetry’ in these fossils is a taphonomic phenomenon. The size frequency distribution plot shows the predominance of smaller individuals in the studied population of Dickinsonia from the Central Urals. Assuming that the age of an individual is manifested in the body size, there is a significant predominance of juvenile individuals in the population. Three possible scenarios can be envisaged: (i) the population has a large number of juvenile individuals as the result of high survivorship rate in the intertidal zone; (ii) the population teems with juvenile forms because it is buried immediately after hatching; (iii) assuming that Dickinsonia was an actively motile organisms, that abundance of juvenile individuals could be explained by their inability to escape burial (although it is difficult to imagine that some of the mature individuals are buried with signs of escape behaviour); and (iv) the population could be interpreted as a fossilised ‘nesting ground’ for Dickinsonia in the intertidal zone where juvenile forms underwent maturation before migrating back to the subtidal zone. The study population can be characterised as expanding or stable; therefore, the intertidal setting can be described as favourable for these organisms.