Sunday, October 20, 2019

Collective Behavior 480 Million Years Ago



Though our understanding of the anatomy of the earliest animals is growing ever more precise, we know next to nothing about their behavior. Did group behavior arise recently or is it primeval? To answer this question, researchers from the CNRS, the University of Poitiers, UBO, Claude Bernard Lyon 1 University1, Cadi Ayyad University (Marrakech, Morocco), and the University of Lausanne (Switzerland) studied fossilized Moroccan Ampyx trilobites, which lived 480 million years ago.

Ampyx priscus in linear formation (Moroccan Lower Ordovician Fezouata Shale)
Credit: © Jean Vannier, Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement (CNRS / ENS de Lyon / Université Claude Bernard Lyon 1)

They showed that the trilobites had probably been buried in their positions—all oriented in the same direction, in orderly lines, maintaining close contact with each other through their long spines—during storms. By comparing this observation with the behavior of living animals such as North American spiny lobsters, the scientists deduced that these Ampyx processions may illustrate a similar kind of collective behavior—adopted in response to cyclic environmental disturbances like storms or to chemical signals associated with reproduction.


Ampyx priscus in linear formation (Moroccan Lower Ordovician Fezouata Shale

Credit: © Jean Vannier, Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement (CNRS / ENS de Lyon / Université Claude Bernard Lyon 1)

This example would seem to suggest that group behaviour is of ancient origin and, from an early date, likely conferred an evolutionary advantage on the first animals, allowing them to survive environmental stress and improve their reproductive chances. These findings are published in Scientific Reports (17 October 2019).



Contacts and sources:
Alexiane Agullo
CNRS

Citation: Collective behaviour in 480-million-year-old trilobite arthropods from Morocco. Jean Vannier, Muriel Vidal, Robin Marchant, Khadija El Hariri, Khaoula Kouraiss, Bernard Pittet, Abderrazak El Albani, Arnaud Mazurier & Emmanuel Martin. Scientific Reports, 2019 DOI: 10.1038/s41598-019-51012-3





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