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Benthic island community on the back of a snail: Silurian, Anticosti Island, Canada
Uppsala University, Music and Museums, Museum of Evolution. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2008 (English)In: Canadian journal of earth sciences (Print), ISSN 0008-4077, E-ISSN 1480-3313, Vol. 45, no 2, 203-211 p.Article in journal (Refereed) Published
Abstract [en]

A single specimen of the large Silurian gastropod Phanerotrema sp. from the Goéland Member on Anticosti Island preserves an outstanding microcosm of its surrounding community, including multiple trophic groups, strategies for niche partitioning, and innovative adaptations for survival in a mud-dominated marine ecosystem. At least seven associations are recorded in this fossil specimen, including the gastropod itself, healed breakage from an apparently failed attempt at durophagous predation, domichnial bioerosion, encrustation by a stromatoporoid, nestling behaviour and commensal embedment by a lingulid brachiopod, and epifaunal attachment by two cornulitids. As a benthic island, the gastropod conch provided a favourable isolated habitat for hard substrate colonizers. This unique specimen sheds light on the broader Paleozoic ecosystem, including the potential importance of benthic islands in the evolution of niche-partitioning strategies in space-limited communities.

Abstract [fr]

Un spécimen unique du grand gastéropode silurien Phanerotrema sp., du Membre de Goéland, dans l'île d'Anticosti, conserve un extraordinaire microcosme de la communauté environnante, dont de multiples groupes trophiques et des preuves de stratégies de séparation de niche et d'adaptations novatrices à la survie dans un écosystème marin dominé par la boue. Au moins sept associations sont conservées dans le spécimen fossile, dont le gastétropode proprement dit, un bri cicatrisé résultant apparemment d'une tentative manquée de prédation durophage, de la bioérosion domichniale, l'incrustation d'un stromatoporoïde, le comportement de nidification et l'inclusion commensale d'un brachiopode lingulidé et l'attachement épifaunique de deux conulaires. En tant qu'îlot benthique, la conche de gastéropode offrait un habitat isolé propice aux colonisateurs de substrats solides. Ce spécimen unique met en lumière l'écosystème paléozoïque élargi, soulignant l'importance potentielle des îlots benthiques dans l'évolution des stratégies de séparation de niche chez les communautés limitées dans l'espace.

Place, publisher, year, edition, pages
2008. Vol. 45, no 2, 203-211 p.
Keyword [en]
Silurian, Anticosti, Phanerotrema
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-87670DOI: 10.1139/E07-054ISI: 000255672000008OAI: oai:DiVA.org:uu-87670DiVA: diva2:133005
Available from: 2009-01-07 Created: 2009-01-07 Last updated: 2017-12-14

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Ebbestad, Jan Ove

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