| Factors conditioning formation and properties of suspended matter resting on
the sea floor (Fluffy Layer Suspended Matter - FLSM) in the Odra river mouth
- Arkona Deep system (southern Baltic Sea) were investigated.
Thirty FLSM samples were collected from four sampling stations, during nine
cruises, in the period 1996-1998. Twenty six chemical properties of the
fluffy material were measured (organic matter-total, humic substances, a
variety of fatty acids fractions, P, N, δ13C, δ15N; Li;
heavy metals- Co, Cd, Pb, Ni, Zn, Fe, Al, Mn, Cu, Cr). The so obtained data
set was subjected to statistical evaluation.
Comparison of mean values of the measured properties led to conclusion that
both seasonal and spatial differences of the fluffy material collected at
the stations occured. Application of Principal Component Analysis, and
Cluster Analysis, to the data set amended with environmental characteristics
(depth, salinity, chlorophyll a, distance from the river mouth), led to
quantification of factors conditioning the FLSM formation. The five most
important factors were: contribution of the lithogenic component
(responsible for 25% of the data set variability), time dependent factors
(including primary productivity, mass exchange with fine sediment fraction,
atmospheric deposition, contribution of material originating from
abrasion-altogether 21%), contribution of fresh autochtonous organic matter
(9%), influence of microbial activity (8%), seasonality (8%). |