bottom sediment

They also sift through the bottom sediments using their tentacles.

This species probably uses its snout to probe for food in the bottom sediment.

The research council also found that heavy traffic by workers trying to clean up the spill weakened the bottom sediment.

Their whiskers serve as feelers in the soft bottom sediments.

The shoreline, and the bottom sediments that are the foundation of the food chain, appear to have been spared.

Preliminary testing indicates that there is some bacterial contamination of the bottom sediment.

Marine worms flourished in the bottom sediment of the sea that covered Illinois.

The slimy bottom sediments may make the hull seem as if it were glued to the earth.

Bacteria and microalgae may also live in the interstices of bottom sediments.

But he said the greatest risk would come from a reviving of contaminants now trapped in bottom sediments.

Most of these genera could probably either walk across the bottom sediment or swim weakly in the water column just above.

The bottom sediments of False Bay are more varied.

The lack of oxygen also increases the release of phosphorus from bottom sediments.

The sand devil is an ambush predator that spends much time buried in the bottom sediment.

The layers were revealed at Walden by lowering a tube filled with dry ice into the bottom sediments.

A water column is a conceptual column of water from surface to bottom sediments.

The amphipod has an important role in bioturbation (mixing and oxidating the bottom sediment).

He developed the technique of using explosive charges to determine the type of ocean bottom sediments and their thickness.

The earth's surface soils, water bodies and bottom sediments are thought to be the primary biospheric sinks for mercury.

For water depths larger than the wave base, bottom sediments are no longer stirred by the wave motion above.

Yet, just outside where the entrance was, archeologists uncovered such bottom sediments "two meters thick with goodies," he said.

The researchers will take samples of bottom sediments and clay, which are to be studied for signs of radioactivity.

Bottom sediments varied almost randomly, with patches of sand, or gravel, or mud in different places.

About one-fifth comes from sewage treatment plants, and perhaps 9 per cent escapes from bottom sediments.

This fish will lie down on its side on the bottom sediments and assume a blotchy coloration.