FIGURE 1. A) Map of the research area showing the core locations. The dashed line shows the approximate position of the section in B) depth vs latitude section showing the dissolved oxygen concentrations and the core locations. Oxygen data were taken from a CTD compilation after Schönfeld et al. (2015). Contour lines indicate the dissolved oxygen concentration interval. Prepared by ODV Software (Schlitzer, 2010)

figure1

FIGURE 2. Schematic description of the focused time intervals and samples considered regarding to the benthic foraminifera study at each core.

figure2

FIGURE 3. Dominance and Fisher α diversity indices calculated for each sample and core. Note that the scale bars are different.

figure3

FIGURE 4. Downcore distributions of the most abundant species (>5% relative abundance) observed in the sediment cores. N.A.: in case of absence of the species. Note that the scale bars are different.

figure4

FIGURE 5. Downcore distributions of A. minimum, A. weddellensis, B. minuta, C. delicata, E. exigua and U. auberiana observed in core M77/1-59-1. Note that the scale bars are different.

figure5

FIGURE 6. Visual description of core M77/1-416 with magnetic susceptibility (SI) measurements and < 63 μm (weight %) information. Relative abundances of given species are potentially in relation with the downslope transported material.

figure6

FIGURE 7. Optical microscope images; scale bar equals 100 μm. 1. Epistominella pacifica umbilical view 47-2; 128 cm, 2. Epistominella exigua spiral view 52-2; 450 cm, 3. Epistominella exigua umbilical view 52-2; 450 cm, 4. Anomalinoides minimus spiral view 59-1; 523 cm, 5. Anomalinoides minimus umbilical view 59-1; 523 cm, 6. Epistominella obesa spiral view 50-4; 100 cm, 7. Epistominella obesa spiral view 50-4; 100 cm, 8. Epistominella obesa umbilical view 50-4; 100 cm, 9. cf. Buccella peruviana spiral view 50-4; 230 cm, 10. cf. Buccella peruviana umbilical view 47-2; 113 cm, 11. Cassidulina auka 416; 100 cm, 12. Alabaminella weddellensis spiral view 52-2; 270 cm, 13. Gyroidina subtenera spiral view 52-2; 270 cm, 14. Gyroidina subtenera umbilical view 52-2; 230 cm, 15. Cassidulina minuta 52-2; 120 cm, 16. Cassidulina carinata 50-4; 210 cm, 17. Cassidulina delicata 47-2; 128 cm.

figure7

FIGURE 8. SEM images; scale bar equals 100 μm. 1. Bolivina seminuda 416; 200 cm, 2. Bolivina cf. seminuda var. humilis 416; 200 cm, 3. Bolivina seminuda var. humilis 47-2; 113 cm, 4. Bolivina pacifica 52-2; 270 cm, 5. Bolivina interjuncta var. bicostata 52-2; 520 cm, 6. Bolivinita minuta 52-2; 270 cm, 7. Bolivina aff. tortuosa 59-1; 523 cm, 8. Bolivina costata 52-2; 270 cm, 9. Bolivina ordinaria 47-2; 128 cm, 10. Bulimina pagoda 52-2; 520 cm, 11. Fursenkoina fusiformis 50-4; 230 cm, 12. Virgulina spinosa 59-1; 963 cm, 13. Fursenkoina glabra 50-4; 230 cm, 14. Anomalinoides minimus spiral view 59-1; 523 cm, 15. cf. Buccella peruviana umbilical view 47-2; 113 cm, 16. cf. Buccella peruviana peripheral view 47-2; 113 cm, 17. cf. Buccella peruviana spiral view 50-4; 230 cm, 18. Epistominella exigua spiral view 52-2; 450 cm, 19. Epistominella exigua umbilical view 52-2; 450 cm, 20. Anomalinoides minimus umbilical view 59-1; 523 cm, 21. Epistominella afueraensis umbilical view 416; 200 cm, 22. Epistominella afueraensis peripheral view 416; 200 cm, 23. Epistominella afueraensis spiral view 416; 200 cm, 24. Alabaminella weddellensis spiral view 52-2; 270 cm.

figure8

FIGURE 9. Optical microscope images; scale bar equals 200 μm. 1. Planulina limbata umbilical view 416; 100 cm, 2. Epistominella pacifica 416; 200 cm, 3. Epistominella pacifica umbilical view 416; 200 cm, 4. Angulogerina angulosa 50-4; 100 cm, 5. Epistominella smithi spiral view 50-4; 210 cm, 6. Uvigerina striata 416; 200 cm, 7. Uvigerina hispida 52-2; 120 cm, 8. Epistominella afueraensis spiral view 416; 200 cm, 9. Epistominella afueraensis umbilical view 416; 200 cm, 10. Gyroidina rothwelli umbilical view 416; 100 cm, 11. Gyroidina rothwelli spiral view 416; 100 cm.

figure9

FIGURE 10. Optical microscope images; scale bar equals 200 μm. 1. Bolivina interjuncta 47-2; 168 cm, 2. Bolivina subadvena 47-2; 113 cm, 3. Bolivina plicata microspheric form 416; 200 cm, 4. Bolivina plicata macrospheric form 416; 100 cm, 5. Bolivina argentea 50-4; 350 cm, 6. Praeglobobulimina spinescens 47-2; 168 cm, 7. Bolivina spissa macrospheric form 52-2; 520 cm, 8. Bolivina spissa microspheric form 47-2; 128 cm, 9. Stainforthia complanata 50-4; 210 cm, 10. Bolivina alata 50-4; 110 cm, 11. Buliminella tenuata 50-4; 100 cm, 12. Globobulimina pacifica 52-2; 230 cm, 13. Uvigerina peregrina 416; 200 cm, 14 - 15. Bulimina exilis 50-4; 100 cm & 350 cm, 16. Buliminella curta var. basispinata 50-4; 350 cm, 17. Uvigerina auberiana 50-4; 350 cm, 18. Cassidulina crassa 52-2; 520 cm.

figure10

FIGURE 11. SEM images; scale bar equals 200 μm. 1. Bolivina interjuncta 47-2; 168 cm, 2. Bolivina plicata microspheric form 416; 200 cm, 3. Bolivina plicata macrospheric form 416; 100 cm, 4. Bolivina spissa 52-2; 520 cm, 5. Uvigerina peregrina 416; 200 cm (different specimen depicted in optical microscope and SEM image), 6. Praeglobobulimina spinescens 47-2; 168 cm, 7. Stainforthia complanata 50-4; 210 cm, 8. Uvigerina auberiana 50-4; 350 cm, 9. Uvigerina semiornata 52-2; 230 cm, 10. Bolivina alata 50-4; 110 cm, 11. Buliminella cf. curta 50-4; 100 cm, 12.-13 Bulimina exilis 50-4; 100 cm & 350 cm, 14. Uvigerina striata 416; 200 cm, 15. Hoeglundina elegans 52-2; 500 cm, 16. Globobulimina pacifica 52-2; 230 cm, 17. Cassidulina delicata 47-2; 128 cm, 18. Cassidulina crassa 52-2; 520 cm, 19. Cassidulina auka 416; 100 cm

figure11

FIGURE 12. Optical microscope images; scale bar equals 100 μm. 1. Bolivina costata 52-2; 270 cm 2. Bolivina ordinaria 47-2; 128 cm, 3. Bolivina cf. seminuda var. humilis 416; 200 cm, 4. Bolivina seminuda 416; 200 cm, 5-6. Bolivina interjuncta var. bicostata 52-2; 520 cm and 450 cm, 7. Bolivinita minuta 52-2; 270 cm, 8. Bolivina aff. tortuosa 59-1; 523 cm, 9. Bolivina seminuda var. humilis 47-2; 113 cm, 10. Bolivina pacifica 52-2; 270 cm, 11. Bolivina tongi var. filacostata 59-1; 523 cm, 12. Buliminella cf. curta 50-4; 100 cm, 13. S uggrunda eckisi 50-4; 110 cm, 14. Suggrunda porosa 47-2; 128 cm, 15. Fursenkoina fusiformis 50-4; 230 cm, 16. Fursenkoina glabra 50-4; 230 cm, 17. Buliminella elegantissima 416; 180 cm, 18. Bulimina mexicana 52-2; 520 cm, Bulimina pagoda 52-2; 520 cm.

figure12

FIGURE 13. SEM images; scale bar equals 200 μm. 1. Cibicidoides wuellerstorfi spiral view 52-2; 500 cm, 2. Cibicides mckannai umbilical view 52-2; 230 cm, 3. Epistominella smithi umbilical view 50-4; 210 cm, 4. Epistominella smithi spiral view 50-4; 210 cm, 5. Planulina limbata umbilical view 416; 100 cm, 6. Epistominella pacifica umbilical view 416; 200 cm, 7. Epistominella pacifica spiral view 416; 200 cm, 8. Epistominella pacifica peripheral view 416; 200 cm, 9. Gyroidina rothwelli spiral view 416; 100 cm, 10. Oridorsalis umbonatus umbilical view 52-2; 230 cm, 11. Gyroidina subtenera umbilical view 52-2; 230 cm, 12. Gyroidina subtenera spiral view 52-2; 270 cm, 13. Epistominella pacifica umbilical view 47-2; 128 cm, 14. Gyroidina rothwelli umbilical view 416; 100 cm, 15. Cassidulina carinata 50-4; 210 cm.

figure13