One of the main outcomes of the eleven meetings of the Working Party was
the recognition of the importance of interdisciplinary studies linking
regional geochemistry with plant, animal and human health. The effects
of major element deficiencies or excesses on plant health are well
known; this is not the case for trace elements. In fact, rapid and
reliable analytical methods for determining trace element abundances
have only recently become available, and it is to be expected that
important new information on trace element levels will be forthcoming.
This, however, is only part of the problem because other factors such as
element speciation, uptake and transmission may be more significant than
total concentration. The pathways of elements from crops to animals are
relatively well defined, but the aetiology of diseases attributable to
elemental inadequacies or excesses is generally quite complex.
Nevertheless, there is good evidence for diseases in livestock in the
British Isles induced by deficiencies of Cu, Se and Co and Mo excess. On
a world scale there is also convincing data on the effect of Na, P and I
deficiencies and F excess on animal health. What is generally lacking,
however, is adequate interaction between geochemists and biochemists,
veterinary scientists and other concerned with animal health.
Interpretation of geochemical data is complex as are connections between
elemental abundances and the health of animals.