Presentation on theme: "Micropaleontologic investigations of harbour sediments in the Baltic Sea using ostracods Dietmar Keyser,Hamburg, Germany Nikolay Aladin, St.Petersburg,"— Presentation transcript:
Micropaleontologic investigations of harbour sediments in the Baltic Sea using ostracods Dietmar Keyser,Hamburg, Germany Nikolay Aladin, St.Petersburg, Russian Federation Burkhard Scharf, Bremen, Germany Peter Frenzel, Jena, Germany Igor Plotnikov, St.Petersburg, Russian Federation
Baltic Sea geological stages Post-littorina Sea, 4000 BP-current (brackish to fresh) Littorina Sea, BP (brackish to saline) Mastogloia Sea, 8000 BP-7500 BP (intermediate stage, fresh to brackish) Ancylus Lake, BP (cold, fresh) Yoldia Sea, 10, BP (cold, saline to brackish) Baltic Ice Lake, 12,600-10,300 BP (cold, fresh to brackish) Eemian Sea, 130, ,000 BP ( brackish, 3°C warmer than today)
The Baltic Sea Furman et al 2004
Partly decalcified shell of Cyprideis torosa (Frenzel & Oertel 2002) due to acidity in the sediment
Shell of an ostracod Length of carapace 0,5 mm
Cyprideis torosa ostracod, right shell of the carapace removed
Cyprideis torosa Animal collected in Salinity <10‰ Animal collected in Salinity > 6‰ Appearance of nodes in the population of Cyprideis torosa is connected with the salinity of the surrounding water. Nodes appear when the salinity drops below the inner osmolarity of 6 ‰ in the animal (Keyser et al. 2004).
Sediment cores will be taken by gravity corer and the sediment collected every centimeter
Unprocessed sample of ostracods
Processed sample of ostracods
Cytheromorpha fuscata (Brady, 1869) Depth 1-30m Substrate vegetationx detritus sandCoarse Mediumxx Fine Mud-- Silt Salinity 1-18 psu Temperature 0-30°C Waterchemistry pH9,1-9,5 H2S O2 Watercurrent Unknown Seasonality Whole year Fossil Quaternary AssemblagesOccurring together with Cyprideis torosa, Elofsonia baltica, Leptocythere lacertosa, Xestoleberis aurantia, Cytherura gibba, Loxoconcha elliptica, Darwinula stevensoni ♀ dorsal view Copulatory organ
Expected achievements of the study 1.biodiversity of ostracods in the entire Baltic 2.evaluation of historic sediments. 3.variation of biosystems. 4.variations in salinity, temperature, sediment, plant growth 5.Influences of oil derivatives and antifouling compounds 6.sediment acidity 7.Invading species
Proposal to HELCOM MONAS HELCOM MONAS is asked to include a monitoring program for meio - zoobenthos into COMBINE HECOM MONAS is asked to urge the adjacent states to support the scientists working in this group in setting up and maintaining a laboratory facility as well as in collecting the samples. The group should meet annually and give a report. The meio-zoobenthos group has to work in close cooperation with the other groups of MONAS and HELCOM. The data received must be included in a meta database like NOKIS (Germany) or others, to be readily available for all interested parties.
Following goals should be worked on: - Biodiversity - Distribution - Seasonality - Ecological borders - Influence of new invading species an internet manual of all known species has to be updated and maintained by the group and access should be free of charge. Funds should be provided for specialists exchange Joint work should be promoted The ostracod group should start to monitor the meio-zoobenthos.