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
The technique used was the core sampler (Core Sampling) which is a set of detachable parts, consisting of the introduction of a rigid cylindrical tube of PVC with 75 mm in diameter, to sample the bottom sediment
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.
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.
Bottom water temperature, salinity and bottom sediment
composition data were also included in the analysis as a covariable data matrix.
Six cores were extracted in the lake bottom sediment
reaching from 50 cm to 212 cm depth (all core depths are referred to the lake bottom).
The present article introduces the yet unpublished analysis results of the bottom sediment
contamination with heavy metals Zn, Cr, Cd, Ni, Cu, Pb and Hg.
crassipes and bottom sediment
samples were taken seasonally during 2005 to collect G.
The physical transport of bottom sediment
is known to have a substantial effect on the spatial distribution patterns of infaunal bivalves in intertidal soft-bottom habitats.
Sediment: Surface bottom sediment
(0-5 cm) samples were collected from each station with the use of an Ekman grab sampler, placed in plastic bags and kept in an ice box.