WP2 Objective # 3: Characterise the relevant fluxes and sedimentation rates in studied areas by using sediment traps Analysis of sediment trap material:

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WP2 Objective # 3: Characterise the relevant fluxes and sedimentation rates in studied areas by using sediment traps Analysis of sediment trap material: the biogenic component Studied samples: 54 for total mass flux 21 for coccolith flux Elisa Malinverno CoNISMa Local Research Unit Dept. of Geological Sciences and Geotechnologies Milano-Bicocca university

Chl-a: yearly average

Circulation in the Ionian Sea: Malanotte-Rizzoli et al., 1997

Circulation in the Ionian Sea: 1998-present Pinardi e Masetti, 2000

August 1998

Total mass flux over Bannock Basin (mg m -2 day -1 ) Nov – Aug (Ziveri et al., 1998)

Samples from sediment traps:

(mg · m -2 · day -1 ) Total mass flux: (mg · m -2 · day -1 ) Above Urania Basin (2800 m) Above Bannock Basin ( m) Malfunctioning No data

An important phytoplankton group >> they contribute to surface PP Coccolithophorids They produce coccoliths (carbonate platelets) >> they contribute to sediment formation They have specific ecological preferences >> their remains give information on past ecosystem conditions

Temperature Species Biogeographic provinces

40-60 m m m R. clavigera H. arethusae F. profundaG. flabellathus M. elegans Depth range

Depth (cm)

Sediment trap: ST m

1,4 1,2 1 0,8 0,6 0,4 0,2 0 (# ·10 9 m -2 day -1 ) Species % ST (avg ) BC07 top MCAT01 top BC07 sapropel

(Klein et al., 1999) Influence of the EMT?

(Ziveri et al., 2000)

Coccolith concentration (10 9 / gram) Coccolith flux (10 9 m -2 day -1 ) ST3-UB Coccolith concentration (10 9 / gram) (Ziveri et al., 2000) ST-BB