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Nat­ural and an­thro­po­genic for­cing on mar­ine pela­gic eco­sys­tems

The ocean has com­plex eco­sys­tems from the coastal to open ocean, which are es­sen­tial as­pects to sus­tain the earth en­vir­on­ments by or­ches­trat­ing the ma­jor por­tion of biogeo­chem­ical cycles of our planet. Al­though nat­ural driven factors and dy­nam­ical ocean sys­tem con­stantly al­ter the bio­chem­ical prop­er­ties of pela­gic eco­sys­tems, but the in­crease of hu­man pol­lu­tions con­trib­ute more pres­sures to the en­vir­on­ment lead­ing to ocean warm­ing, acid­i­fic­a­tion, and deoxy­gen­a­tion. Un­til now the rate in which nat­ural and an­thro­po­genic pro­cesses re­spons­ible for cur­rent changes in pela­gic eco­sys­tems is far from clear long-term ob­ser­va­tions. These is­sues in­spire the back­ground of this PhD pro­ject to dis­tinct the sig­nals of the nat­ural and an­thro­po­genic para­met­ers in the mar­ine pela­gic eco­sys­tems. This pro­ject will fo­cus on (pa­leo)eco­lo­gical re­con­struc­tions of mar­ine pela­gic mi­cro­fossil (par­tic­u­larly dino­fla­gel­late cysts) as­so­ci­ations that rep­res­ent vari­ous trophic levels in high tem­poral res­ol­u­tion sed­i­ment­ary archives, cov­er­ing the pre-in­dus­trial and in­dus­trial time span. The re­con­struc­tion is tar­geted to un­veil the shifts of the mar­ine pela­gic eco­sys­tem in the past and present times, to en­able fu­ture cli­mate pro­jec­tion.