They scrape and bite food of many kinds as well as stirring up the bottom sediment, filtering out larger particles with the papillae around their mouths.
32.
The potential for TP to leave the bottom sediments and become available to algae in the water column ( internal loading ) is low to moderate.
33.
The depth of the oxic / anoxic interface separating the two layers varies from a few centimeters to near the bottom sediments, depending on local conditions.
34.
This made the bottom sediments more hospitable, and allowed a wider range of organisms to inhabit them creating new niches and the scope for higher diversity.
35.
The exposed lake bottom sediments were blown by the prevailing westerly winds to form the sand dunes that still lie on the east side of Summer Lake.
36.
For instance, a suitably weighted metal tube, hack-sawed off like a giant hypodermic syringe, with a cord attached for retrieval, can by used to get bottom sediment samples.
37.
Seismic studies by the Russians indicate that the lake water could be more than 2, 000 feet deep, with bottom sediments about 500 feet deep at one end.
38.
Many of those chemicals, including PCBs, seem to enter the food chain as they seep out of the lake-bottom sediments where they've settled over decades of industrial use.
39.
What makes this location special is that the calcareous ocean-bottom sediment that was deposited here never turned to hard stone as it does almost everywhere else in the region.
40.
An expedition last year found that concentrations of Cesium-137 and Strontium-90 in bottom sediments at two of the dumps were dozens of times above normal levels, the statement said.
