Microbes such as bacteria are the most numerous organisms on Earth, and about 90% of them live in sediments buried under the sea floor.
Meiofaunal metazoans (in general, those that pass through a 1-mm screen but are retained on a ~50-μm screen), such as certain nematodes and oligochaetes, reportedly live in sediments where oxygen is undetectable (e.g. [ 2, 4– 6]).
Some of the very flat-bodied Ediacarans, for instance, lived on sediments and appear to have fed by directly absorbing nutrients by osmosis.
As a result, animals feeding or living in sediments could be exposed to anthropogenic lead.
Benthic infaunal organisms living in sediments encounter relatively high concentrations of pollutants and may also suffer toxic effects of ENPs.
The quantification of land use effects on dominant erosive processes such as river bank and river bed erosion, landslides and the concentrated flow erosion on footpaths and roads can contribute to more targeted efforts and relevant incentives to reduce (or live with) sediment load of the rivers.
And many of these animals feed in or live in sediment.
Few octocorals and stylasterids are adapted to live in sediment habitats [21], [22] so infrequent observations of those groups on the WAP margin compared to the more current-swept areas of the Drake Passage were also expected.
However, at this stage, it should be noted that we cannot rule out, the possibility that the fish initially mounted an immune response to a related molecule such as a bacterial derived serine protease, since SpSsp1 has significant similarity to serine proteases from bacteria living in sediments (Salinispora sp).
Trophic transfer of Hg from algae added to the water column was determined to be the major uptake route for amphipods, suggesting inputs of contaminated organic matter from the pelagic zone are important to mercury bioaccumulation even in organisms living in sediments.
