We need to do more research on contaminated sites. Elemental mercury contamination is a problem. We must measure all mercury species. We need to understand ionic mercury better and to distinguish ionic mercury from elemental mercury. Understanding speciation will aid in understanding methylation.
Biodiversity is absent at mercury contaminated sites.
We should look at what is not there. There is evidence of fish methylating their own mercury. Sediments contain mostly elemental mercury. Mercury must be viewed as a systemic contaminant. Selection is a marker.