Proc. IODP, 340, Data report: the Late Quaternary fossil record of holoplanktonic gastropods at IODP Sites U1395 and U1394

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Abstract Introduction Methods Core sampling Microfossil analysis Results Dominant species and their environmental requirements Species changes with global temperature Species associations Conclusions Acknowledgments References Figures Figure F1. Site CAR-MON 2 location map. Figure F2. Larval shells, Hole U1395B. Figure F3. Dominant gastropods, Site U1394. Figure F4. Dominant gastropods, Site U1395. Figure F5. Dominant gastropods, Site CAR-MON 2. Figure F6. Common to rare gastropods, Site U1394. Figure F7. Common to rare gastropods, Site U1395. Figure F8. Common to rare gastropods, Site CAR-MON 2. Tables Table T1. Gastropod environmental preferences. Table T2. Temperature marker and gastropod correlation, Site U1394. Table T3. Temperature marker and gastropod correlation, Site U1395. Table T4. Temperature marker and gastropod correlation, Site CAR-MON 2. PDF file			Previous \| Next doi:10.2204/iodp.proc.340.203.2015 Data report: the Late Quaternary fossil record of holoplanktonic gastropods at IODP Sites U1395 and U1394¹ Deborah Wall-Palmer,² Christopher W. Smart,² and Malcolm B. Hart² Abstract Living holoplanktonic gastropods (pteropods and heteropods) are a common component of the zooplankton at all latitudes and are highly sensitive indicators of surface ocean changes. Despite having a fossil record that may extend from the Jurassic, there are few detailed stratigraphic sequences of holoplanktonic gastropods and, consequently, they are rarely used in biostratigraphy. This is largely due to the susceptibility of their delicate aragonitic shells to dissolution. However, in well-preserved sediments, fossil holoplanktonic gastropods have the potential to contribute valuable information for paleoceanography, paleoecology, and stratigraphic correlation. Here we present a ~300 ky record of holoplanktonic gastropods from two sites cored/drilled offshore of Montserrat during Integrated Ocean Drilling Program (IODP) Expedition 340. Oxygen isotope stratigraphy was used to produce a stratigraphic framework for each site, which was compared and correlated to the corresponding downcore abundances of holoplanktonic gastropods. In addition, the record of previously cored Site CAR-MON 2, ~15 km southwest of IODP Site U1396, was compared to data at Sites U1395 and U1394 to identify species associations that are reproducible across the area. A number of downhole distributions were found to correlate significantly across the three sites, highlighting ten key species, three of which (Heliconoides inflatus, Creseis clava, and Atlanta plana) display significant relationships to multiple holoplanktonic gastropod species. Fluctuations in species abundance were found not to be related to changes in temperature, locally or globally, and were more likely to indicate predator-prey relationships or competition for prey. This made holoplanktonic gastropod assemblages unsuitable as stratigraphic markers in this area but improves our understanding of holoplanktonic gastropod ecology in the Caribbean Sea. ¹ Wall-Palmer, D., Smart, C.W., and Hart, M.B., 2015. Data report: the Late Quaternary fossil record of holoplanktonic gastropods at IODP Sites U1395 and U1394. In Le Friant, A., Ishizuka, O., Stroncik, N.A., and the Expedition 340 Scientists, Proceedings of the Integrated Ocean Drilling Program, 340: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.340.203.2015 ² School of Geography, Earth and Environmental Sciences, Plymouth University, Plymouth, PL4 8AA, UK. Correspondence author: deborah.wall-palmer@plymouth.ac.uk Initial receipt: 26 February 2015 Acceptance: 16 August 2015 Publication: 11 December 2015 MS 340-203 Top of page \| Previous \| Next