Benthic foraminiferal response to trophic changes across the last glacial-

Holocene transition in the abyssal eastern Mediterranean Sea

Katharina Müller-Navarra

Katharina Müller-Navarra*, A. Lochte & G. Schmiedl

University of Hamburg*katharina.mueller-navarra@uni-hamburg.de

Study Area

Study Area

SL71-2

Katharina Müller-Navarra

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Sapropel formation

0.1 mm

0.1 mm

Chilostomella oolina

Globobulimina affinis

Approach

Katharina Müller-Navarra

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Results & Discussion I

Baseline Baseline3xNutri3xNutri Nile+NutriNile+NutriIniGlacIniGlacIniGlac+3xNutriIniGlac+3xNutri

>1800 m

Levantine

Katharina Müller-Navarra

[R. Grimm 2012, unpubl.]

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Results & Discussion II

oligotroph mesotrophultra-oligotrophfood content oligotroph

Sapr

opel

S1

Katharina Müller-Navarra

PC1 M. subrotunda

PC2 A.tubulosa

PC4 C. laevigata

PC3 Q. viennensis

0.1 mm

0.1 mm

Cal. years BP

Q-mode PCA

Results & Discussion III

20 µm

Eponides pusillus

Individuals>125µmSa

prop

el S

1

Bolivina spp

Katharina Müller-Navarra

Cal. years BP

Cal. years BP

Individuals63–125µm

Sapr

opel

S1

Ind./g

Anomalinoides minimus

20 µm

Conclusions

- Benthic foraminiferal faunas are lacking evidence for eutrophication in the Levantine Basin before sapropel S1 formation

- The model shows: there is the potential to develope an oxygen depletion within a time periode of 6000 years due to enhanced fresh water supply

(- We are currently measuring benthic isotope data)

Katharina Müller-Navarra

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Thanks!

Katharina Müller-Navarra

Katharina Müller-Navarra*, A. Lochte & G. Schmiedl

University of Hamburg*katharina.mueller-navarra@uni-hamburg.de