On page 2, what does the “Increasing” predicted toxicity gradient mean?
A. Each sediment quality guideline is intended to describe a particular–but unique–point in a spectrum of toxicity. These points range from lower thresholds, below which samples are presumably non-toxic, to upper thresholds of toxicity, above which samples are predicted. The guidelines have been ordered according to the level of toxicity each is intended to describe, from low to high.
