The lower value of dissolved oxygen or de-oxygenation inside the trench might be associated with greater biological activity in the trench water and trench bottom sediment
. Recent studies (19-22) have elucidated the existence of higher biomass in hadal water columns.
Figure 2 shows the vertical distribution of Zinc contents (in mg [kg.sup.-1]) in the different samples (T1, T4, T6 and T8, respectively) from bottom sediment
deposited in the Mae D'Agua Lake.
Additionally, high bottom sediment
acid-insoluble residue, current speed, and nitrate concentration were measured in Malindi but were found to be lower in Shimoni compared to the rest of the study reefs.
Lam, "Sedimentological Characteristic of Bottom Sediment
of Vietnamese Coastline," in Proceedings of the Fourth Technical Seminar on Marine Fishery Resources Survey in the South China Sea, pp.
An official with the Environmental Protection Agency said Xcel Energy's first efforts to demonstrate the practicality of the wet dredge method for contaminated lake bottom sediment
removal at the Ashland Superfund location have been largely successful.
The first key to finding them is understanding that sexually mature kings split off the feeding grounds where the immatures remain, seeking the scent from the bottom sediment
of their parental streams."
However, studies have also confirmed the presence of surviving "legacy" FIB in stream bottom sediment
. These background organisms are a concern because the bottom sediment
is resuspended, along with the FIB persisting in the sediment, during high flow conditions.
Due to its high fecundity and feeding methods of digging through bottom sediment
for food, they are known to have altered habitats for native fish and other aquatic species.
Spectroscopy is an analytical technique in which dry river bottom sediment
sample is exposed to X-rays.
In order to check the geochemical and analytical changeability in the spillover area in the Dcbnicki Bridge vicinity, MD, additional 3 samples MD1-MD3 of bottom sediment
of the Vistula River were collected in the bank area and one MD4 at about 8 m from the spillover, as well as sediment sample MD5 from below the bridge.