Gastéropodes à la carte: durophagy on Ordovician gastropods from Manitoulin Island, Canada
2007 (English)In: 51st Palaeontological Association Annual Meeting December 16-19, 2007: Programme with Abstracts, 2007, 31- p.Conference paper (Other academic)
Shell repairs resulting from presumed failed predation were found in gastropods from the Late Ordovician (Cincinnatian; Richmondian) mid to upper Kagawong Submember, Georgian Bay
Formation, on Manitoulin Island, Ontario, Canada. The bryozoan-mollusc biota and lithology of this unit suggest nearshore, shallow (<10 m), low energy (lagoonal) conditions which by
analogy with relatively recent faunas and carbonates of similar character may point to a mesotrophic to eutrophic nutrient regime. Division of the number of individual shells with at
least one scar by the total number of shells in each sample, yielded a shell repair frequency of 4.8% for 207 (total) specimens of Lophospira trilineata and 35.7% in 28 specimens (total) of
Trochonemella sp. Repairs in Trochonemella occur primarily in the largest size class, suggesting that a size refuge was achieved by this species. The low repair frequencies observed in L. trilineata suggest that this species experienced a higher predation success rate or a lower level of predation pressure. This is the only case study to date which documents Ordovician shell repair frequencies in consistent, homogenous sample sets collected from the same stratigraphic unit, evaluated against standardized analytical approaches. The results suggest that the paradigm of a standardized low level of shell repair in Ordovician and Silurian gastropods is oversimplistic, and that a range of frequency rates can be expected.
Place, publisher, year, edition, pages
2007. 31- p.
Ordovician, gastropods, shell repair, Manitoulin Island, Canada
IdentifiersURN: urn:nbn:se:uu:diva-12458OAI: oai:DiVA.org:uu-12458DiVA: diva2:40227