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Post-Miocene Shift in Stereotypic Naticid Predation on Confamilial Prey from the Mid-Atlantic Shelf: Coevolution with Dangerous Prey

2000; Society for Sedimentary Geology; Volume: 15; Issue: 5 Linguagem: Inglês

10.1669/0883-1351(2000)015 2.0.co;2

1938-5323

Gregory P. Dietl, Richard R. Alexander,

Marine and coastal plant biology

Other| October 01, 2000 Post-Miocene Shift in Stereotypic Naticid Predation on Confamilial Prey from the Mid-Atlantic Shelf: Coevolution with Dangerous Prey GREGORY P. DIETL; GREGORY P. DIETL 1Department of Zoology, North Carolina State University, Raleigh, NC 27695-7617 Search for other works by this author on: GSW Google Scholar RICHARD R. ALEXANDER RICHARD R. ALEXANDER 2Department of Geological and Marine Sciences, Rider University, Lawrenceville, NJ 08648-3099 Search for other works by this author on: GSW Google Scholar PALAIOS (2000) 15 (5): 414–429. https://doi.org/10.1669/0883-1351(2000)015 2.0.CO;2 Article history accepted: 20 Jun 2000 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation GREGORY P. DIETL, RICHARD R. ALEXANDER; Post-Miocene Shift in Stereotypic Naticid Predation on Confamilial Prey from the Mid-Atlantic Shelf: Coevolution with Dangerous Prey. PALAIOS 2000;; 15 (5): 414–429. doi: https://doi.org/10.1669/0883-1351(2000)015 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyPALAIOS Search Advanced Search Abstract Of More than 4000 specimens of the naticid gastropods Euspira heros (Say) and Neverita duplicata (Say) from southern New Jersey, the lower Pleistocene of North Carolina, upper Miocene of Maryland, and the lower Miocene of Delaware, subsamples with complete and incomplete boreholes (n = 613) were compared for borehole-site stereotypy, prey size-selectivity, prey profitability, and prey effectiveness. In confamilial encounters, adaptation of naticid predators is evidenced by a shift in borehole-site stereotypy on the body whorl toward the umbilicus during the last 18 my, particularly for N. duplicata. Inferentially, an umbilical drilling position enabled the base of the predator's foot to occlude the prey aperture and prevent egress of the dangerous prey's foot, thereby reducing the prey's escape potential. The tradeoff was that the umbilical site required the predator to drill through a thicker shell location.Prey effectiveness, the ratio of incomplete boreholes to total attempts, was initially low (0.03) for both species in the lower Miocene, but increased appreciably from the Pleistocene to the Recent for N. duplicata (0.32). Such increase in successful prey escape indirectly may reflect prey adaptation since the Miocene. Cost/benefit curves, i.e., log of the ratio of apertural lip thickness /internal shell volume regressed on whorl diameter (WD), have significantly greater negative slopes for Miocene versus Recent conspecifics. Lower cost/benefit ratios for successive size classes of modern naticids suggest that confamilial prey have become increasingly profitable molluscan options as they increased in size, despite increased risk of fatality to the predator. Decreasing naticid prey size-selectivity, as evidenced by lower regression correlation coefficients since the Miocene, reflects increasing mismatches between predator and prey size. Outcomes of size mismatches in predatory encounters between E. heros and N. duplicata were not predictable necessarily given potential differences in species agressiveness and foot size. This unpredictability fueled coevolution between these cannibalistic moonsnails and their dangerous intraspecific and interspecific prey. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.