European Directory of Marine Environmental Data (EDMED)

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General
Data set name

MATER Project Biology in settling particles (1997-1998)

Data holding centreHellenic Centre for Marine Research, Hellenic National Oceanographic Data Centre
CountryGreece  Greece
ProjectMEDITERRANEAN TARGETED PROJECT MTP II-MATER(MATER)
Time periodApril 1997 - March 1998
OngoingNo
Geographical area

North and South Aeagen Sea

Observations 
Parameters

Sedimentation flux of pigments in the water column; Sedimentation flux of biological detritus in the water column; Sedimentation flux of identified biota expressed as carbon in the water column

Instruments

Sediment traps

Description 
Summary

Phytoplankton sedimentation was determined in depths 500 and 1213 m, using a sediment trap mooring. Subsamples for microscopic examination were taken and fixed with formaldehyde (ca. 2% final concentration). Phytoplankton was counted according to a combination of methods described in Sournia (1978). A standard light microscope, furnished with a counting stage (Semina 1978) was used. The whole sample was gently mixed. Counting of the pico- and most abundant nanoplankton algae (< 2 micro m and 2 - 20 micro m, respectively), was carried out in the Fuchs-Rosenthal counting chamber with magnification of 400 x. After the smaller phytoplankton was enumerated, samples were allowed to settle for a week, and then slowly decanted through a glass tube covered with two layers fine-mesh nylon gauze to a 5-10 ml concentrated sample. After gentle mixing, a sub-sample was transferred to a 0.05 ml. chamber. Cells were counted under magnification of 200 x. In order to count rare (usually larger) forms, the whole sample was reduced to 1 ml by settling to a 1.0 ml chamber. As this was rather thick, only a low power objective (100 x magnification) could be used. Biovolumes of individual cells were calculated from linear dimensions of measured cells applied to appropriate stereometric formulae (Smayda 1978). The carbon content of the algae (PPC) was calculated based on average volume of the different species and according to Strathmann (1967).Faecal pellet sedimentation was determined in depths of 500 and 1213 m, using a sediment trap mooring. Subsamples for microscopic examination were taken and fixed with glutaraldehyde (ca. 4% final concentration). Sedimented faecal pellets (FP) were enumerated under an inverse microscope according to Utermohl (1958). The FP were classified according to their shape as cylindrical, filiform and oval. Some of these categories were then separated into size classes according to the width and length of the FP. The faecal pellet volume (FPV) was calculated using appropriate stereometrical configurations according to Edler (1979). To calculate the faecal pellet carbon (FPC) content a factor of 0.0694 mg C mm-3 obtained by Gonzalez and Smetacek (1994) was used The data shown here are presented in terms of carbon (mg C m-2 d-1)

OriginatorsNorwegian College of Fishery and Science,University of Tromsø
Data web sitehttp://hnodc.hcmr.gr/?page_id=351
Availability 
OrganisationHellenic Centre for Marine Research, Hellenic National Oceanographic Data Centre
AvailabilityUnrestricted
ContactA. Iona
Address

Hellenic Centre for Marine Research, Hellenic National Oceanographic Data Centre
46.7 km Athinon-Souniou Av. P.O.Box 712
Anavissos

19013
Greece

Telephone+30-22910-76367
Facsimile+30-22910-76347
Emaildata@hnodc.hcmr.gr
Administration 
Collating centreHellenic Centre for Marine Research, Hellenic National Oceanographic Data Centre
Local identifier6005033
Global identifier1205
Last revised2015-07-20