Abstract：
:Interactions and coordination between conspecific individuals have produced a remarkable variety of collective behaviours. This co-operation occurs in vertebrate and invertebrate animals and is well expressed in the group flight of birds, fish shoals and highly organized activities of social insects. How individuals interact and why they co-operate to constitute group-level patterns has been extensively studied in extant animals through a variety mechanistic, functional and theoretical approaches. Although collective and social behaviour evolved through natural selection over millions of years, its origin and early history has remained largely unknown. In-situ monospecific linear clusters of trilobite arthropods from the lower Ordovician (ca 480 Ma) of Morocco are interpreted here as resulting either from a collective behaviour triggered by hydrodynamic cues in which mechanical stimulation detected by motion and touch sensors may have played a major role, or from a possible seasonal reproduction behaviour leading to the migration of sexually mature conspecifics to spawning grounds, possibly driven by chemical attraction (e.g. pheromones). This study confirms that collective behaviour has a very ancient origin and probably developed throughout the Cambrian-Ordovician interval, at the same time as the first animal radiation events.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Vannier J,Vidal M,Marchant R,El Hariri K,Kouraiss K,Pittet B,El Albani A,Mazurier A,Martin Edoi
10.1038/s41598-019-51012-3subject
Has Abstractpub_date
2019-10-17 00:00:00pages
14941issue
1issn
2045-2322pii
10.1038/s41598-019-51012-3journal_volume
9pub_type
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