SHAPE DIFFERENCES AMONG BOREHOLES DRILLED BY THREE SPECIES OF NATICID GASTROPODS |
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| Authors: | GREY, MELISSA BOULDING, ELIZABETH G. BROOKFIELD, MICHAEL E. |
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| Affiliation: | 1Department of Zoology, University of Guelph, Guelph, Ontario, N1G 2W1 Canada;; 2Department of Land Resource Science, University of Guelph, Guelph, Ontario, N1G 2W1 Canada;; and 3Present address: Department of Earth and Ocean Sciences. University of British Columbia, Vancouver, British Columbia, V6T 1Z4 Canada |
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| Abstract: | Naticid gastropods leave a record of predation in the form ofcharacteristic countersunk circular boreholes. We fed bivalveprey to naticids to test whether the ratio between the innerand outer borehole diameter differed among three Recent naticidspecies: Euspira heros, E. lewisii and Neverita duplicata. Fossilshells from a Miocene-aged assemblage, containing naticids previouslyidentified as E. heros and N. duplicata, were also includedin our analyses. Ratios of the inner to outer diameters of naticidboreholes in bivalve shells showed that there were significantdifferences in borehole shape between E. heros and the two otherRecent species. We found no significant differences betweenthe ratios of E. lewisii and N. duplicata; however, a principalcomponent analysis showed that boreholes distinctly clusteraccording to species. The Miocene boreholes were also distinctfrom the Recent, indicating that the Miocene naticids may bea separate species from E. heros and N. duplicata. We have shownthat there is a species-specific component to borehole geometry.This may have important implications for palaeobiological studies,because the index of borehole functionality, previously describedas an inner to outer borehole ratio of 0.5 for all naticids,may differ between species. (Received 23 March 2004; accepted 10 January 2005) |
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