Terrestrial run off is a long term problem for hard corals.  Heavy metals, pesticides, hydrocarbons are adding to natural environmental stress of disease and temperature extremes.  Coral reefs are suffering degradation at an alarming rate.  In order to detect causes and develop necessary mitigation for environmental stresses, the area extent and history of pollutant uptake, coupled with the growth rate of coral species is critical. Coral species (and Mollusks) grow seasonal and daily growth rings that incorporate proportional amounts of metal and organic pollutants into their skeletal structure.  We propose to use UC Davis LA/MS facilities to adapt the existing fish otolith method (LA/MS)to sample and record the calcium/pollutant ratio to coral and other invertebrates. In the otolith technique, microscopic sections of the calcareous otolith are burned by laser (under a microscope) within the daily, monthly or seasonal growth rings and the vaporized material taken through a Mass spectrometer where the ratio of calcium to pollutant is detected. This survey technique may be used to document the fate and transport of pollutants within ecosystem, and to provide estimates of the extent and severity of pollutants over time and area. It is rather like sediment testing but with the added advantage that it is related to actual uptake and may be correlated to organism growth.