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 Conclusions The variations in abundance and assemblage of holoplanktonic gastropods offshore of Montserrat are not closely related to changes in water temperature. This is because the species present have a wider temperature tolerance than the small changes in Caribbean Sea temperature over the last 300 ky. It is assumed that other factors, such as food sources have driven these changes. Therefore, the abundances of holoplanktonic gastropods are not suitable stratigraphic markers in this area. Significant correlations between some species were reproducible across all sites and may be useful in helping us to understand the environmental requirements of poorly known species, in particular, the heteropods. Negative correlations between pteropod and heteropod species suggest that the preferential prey of heteropods was in competition with pteropods for resources. This also indicates that the preferred prey of heteropods are shell-less organisms such as copepods because they left no fossil trace. Three species were found to be associated with more than one other species, suggesting that they could have a key role in holoplanktonic gastropod ecology. However, the ecological and paleoceanographic significance of these species relationships could not be interpreted. Top of page \| Previous \| Next

Conclusions