that issue, the committee first considered how to define objectively the degree to which observed effects are adverse. Defining adversity is essential for ERA because the mere existence of an effect is not sufficient to conclude that it is adverse. The committee concluded that the only way to determine whether an effect is adverse and how adverse it might be is to assess the degree to which it affects an organism’s survival and reproductive success; any effect that results in a change in either survival or reproduction is relevant to the assessment, and any effect that does not change either outcome is irrelevant with respect to a quantitative assessment of population effects. Thus, EPA in Step 2 (see Figure S-1) should conduct a broad search to identify sublethal effects of pesticides and any information on concentration-response relationships. In Step 3, the Services should then show how such effects change probability of survival or reproduction of the listed species and incorporate such information into the population viability analyses or state that such relationships are unknown but possible and include a qualitative discussion in the uncertainty section of the BiOp. The inability to quantify the relationship between a sublethal effect and survival or reproductive success does not mean that the sublethal effect has no influence on population persistence; but in the absence of data, the relationship remains a hypothesis that can be discussed only qualitatively with reference to the scientific literature to explain why such a hypothesis is tenable.
|Data Type||Examples of Authoritative Data Sources|
|Topography||Topographic features can be derived from elevation data in the National Elevation Dataset, the Shuttle Radar Topography Mission, and the Global Digital Elevation Map.|
|Hydrography||Watershed data are available on line from EPA; watersheds are referred to by hydrologic unit codes of the US Department of Agriculture Natural Resources Conservation Service.|
|Meteorology||Data are available from the National Oceanographic and Atmospheric Administration National Climatic Data Center.|
|Solar radiation||Solar-radiation data are available from the National Aeronautics and Space Administration Earth Observing System Solar Radiation and Climate Experiment;a solar insolation can be estimated by using the on-line calculator of the Photovoltaic Education Network.|
|Soils||Soil surveys are available from the US Department of Agriculture Natural Resources Conservation Service.|
|Geology||Geological data are available from the US Geological Survey Mineral Resources Online Spatial Data.|
|Land cover||Land-cover data are available from the National Agricultural Statistics Service.|
aSolar-radiation measurements are taken at the top of Earth’s atmosphere. Computer modeling is required to estimate solar radiation at Earth’s surface.