Mercury is a metal naturally found in small amounts
in rock soil.
Human activities such as the flooding of forested lands
that have peat moss soils, high in organic content
or the flooding of wetlands,
commonly result in a temporary increase in mercury
(in the form of methylmercury) in the water, and
subsequently in the organisms that live and use
From Plankton To People
Mercury concentrations increase from one level
of the food chain to the next.
Women and children need to be particulary
careful when eating certain fish. Mercury in fish
is transfered through the blood to the growing baby,
resulting in developmental problems.