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Table II. Evaluation of Program Effects on Interior Least Tern <br />Potential Sources of Current <br />Possible Analysis <br />and Future Data <br />Methods' <br />Time Frame <br />A. Program Effects on Least Tern Habitat <br />1) Program effects on quantity, quality, and <br />spacial distribution of least tern riverine <br />nesting habitat <br />Data Needs: <br />0 Aerial/satellite photographs <br />0 Trend analyses <br />At 3 -year intervals <br />Open, unobstructed channel width <br />0 Videography <br />a Quantitative <br />• GIS database <br />before /after <br />• Permanent transects'- <br />comparisons by <br />bridge segment <br />Data Needs: <br />Aerial /satellite photographs <br />Trend analyses <br />At least twice <br />Amount of bare sand substrate at various <br />Videography <br />Quantification by <br />annually; 10 -13 <br />discharges <br />Permanent transects <br />bridge segment <br />years <br />• USGS gaging stations <br />Data Needs: <br />Sampling within one mile of nesting <br />Trend analyses <br />Twice annually; 10- <br />Discharge <br />terns <br />13 years <br />Water temperature <br />Forage fish abundance and species <br />composition <br />2) Program effects on the sustainability of <br />riverine nesting habitat <br />a) Channel morphology/ sediment <br />availability <br />WC roost transects <br />Sediment/vegetation <br />G 4 -5 annually, for 8 <br />Data Needs <br />USGS/USBR sediment transects <br />model <br />years (transects); <br />Water Depth <br />Permanent transects <br />Trend analyses <br />0 incidentally, pre - <br />Unobstructed channel width <br />Aerial /satellite photographs <br />and post -flood <br />Wetted width <br />Videography <br />measurements <br />Extent of bare substrate <br />